JP2002295512A - Power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission device capable of assembling certain ly and easily without lowering the shear performance of a shear pin. SOLUTION: The self-standing guide part 27, making a shear pin self-standing in the condition that the shaft center of shear pin 15 is inserted freely coinciding with the shaft center of the fitting part 26, is provided with the pressing hole 19 for shear pin. Therefore, the shear pin 15 can be easily inserted into the pressing hole 19 of the shear pin without lowering the shear performance of the shear pin 15. Also, the flange 17 is formed on the side of drive plate 4 and the fitting part 30 is formed to the circumference face of this flange 17, on the other hand the fitting part 31 is formed on the drive plate 4 other than the notch 16 of the shear pin and the locking means of rotation is provided to prevent the simultaneous rotation of the shear pin 15 by the tightening torque of the nut 21. Therefore, the tightening torque of the nut 21 is not giving to the notch 16 even if the nut 21 is tightened by strong power, and the pulley 3 can be certainly and easily tightened and fixed the drive plate 4 through the shear pin 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an air conditioner for a vehicle, etc.
The present invention relates to a power transmission device attached to an auxiliary device for a vehicle.

[0002]

2. Description of the Related Art Some conventional power transmission devices include, for example,
The one shown in Japanese Utility Model Laid-Open No. 1-169619 has been proposed. In this power transmission device, a power transmission member integrated with a rotating shaft of an auxiliary machine and a power transmission member are connected by a plurality of shear pins, and when the auxiliary machine is overloaded, the shear pin is sheared. By doing so, it is possible to prevent the operation of other linked auxiliary machines from being hindered.

[0003]

However, if the shear pin is overloaded in the assembling process of the power transmission device and the shear pin is damaged and deteriorated, the shear performance may be affected. Here, if artificial measures are taken so as not to overload the shear pin in the assembling process, the assembling time is lengthened and the assembling cost of the power transmission device is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of such a background art, and an object of the present invention is to provide a power transmission device that can be reliably and easily assembled without reducing the shearing performance of a shear pin.

[0005]

According to a first aspect of the present invention, there is provided a power transmission member rotatably mounted on a housing of a vehicle accessory concentrically with a rotating shaft of the accessory, and A power transmission member fixed to a rotating shaft and disposed to face the driven power transmission member in the axial direction of the rotation shaft, and a weak portion is disposed between opposing surfaces of the driven power transmission member and the power transmission member. A plurality of shear pins for connecting the power transmission member and the power transmission member, wherein one end of the shear pin is press-fitted into one of the power transmission member and the power transmission member to be fixedly mounted. A hole is formed, and on the other side, a shear pin insertion hole for inserting the other end side of the shear pin is formed, and the other end is fastened and fixed to the one using a projecting end portion of the shear pin protruding from the other shear pin insertion hole. Power transmission In location, the shear pins press-in hole is provided with a fitting portion fitted fixedly provided a shear pin,
The receiving end of the shear pin is formed to have a diameter larger than that of the fitting portion so that the shear pin can be inserted and the center axis of the inserted shear pin is aligned with the center axis of the fitting portion so as to be free standing. It is characterized by having a self-supporting guide portion.

According to the second aspect of the present invention, a power transmission member is rotatably mounted concentrically with a rotating shaft of the auxiliary machine in a housing of the auxiliary machine, and is fixed to the rotating shaft.
A power transmission member is disposed facing the power transmission member in the axial direction of the rotation shaft, and a fragile portion is disposed between opposing surfaces of the power transmission member and the power transmission member. A plurality of shear pins for connecting the transmission member and the power transmission member, and forming a shear pin press-in hole for press-fitting one end side of the shear pin and fixing the shear pin to one of the driven power transmission member and the power transmission member, On the other hand, a power transmission device for forming a shear pin insertion hole through which the other end of the shear pin is inserted, and fastening and fixing the other to the one by using a protruding end portion of the shear pin protruding from the other shear pin insertion hole, At one end of the shear pin, there is provided a fitting portion which is fitted and fixed in the shear pin press-fitting hole, and is formed at the insertion end into the shear pin press-fitting hole to have a smaller diameter than the fitting portion. It is characterized in further comprising a self-supporting guide portion for self-standing of the shear pin in a state wherein the central axis is matched to the central axis and the shear pins press-fit hole of and inserted shear pin insertable into the press-fit hole.

According to a third aspect of the present invention, a power transmission member is rotatably mounted concentrically with a rotation shaft of the auxiliary device in a housing of the vehicle auxiliary device, and is fixed to the rotation shaft.
A power transmission member disposed opposite to the power transmission member in the axial direction of the rotation shaft, and a fragile portion is disposed between opposing surfaces of the power transmission member and the power transmission member. A plurality of shear pins for connecting the member and the power transmission member, and a shear pin press-fitting hole for press-fitting one end side of the shear pin and fixing the shear pin is formed in one of the driven power transmission member and the power transmission member, and A shaping pin insertion hole through which the other end of the shear pin is inserted, a thread portion is formed at a projecting end of the shear pin projecting from the other shear pin insertion hole, and a nut is screwed into the thread portion to form a screw. In a power transmission device in which the other is fastened and fixed to the one,
The shear pin is formed along the edge of the weakened portion of the shear pin along the edge of the other of the weakened portions, the flange being in contact with the opposing surfaces of the power transmission member and the power transmission member and interposed therebetween. A detent means is provided between the driven power transmission member and the power transmission member to prevent the shear pin from rotating with the fastening torque of the nut.

[0008] In the invention according to claim 4, claim 3 is provided.
The detent means described above is an engaging portion formed on the flange, and a locking portion formed at a predetermined position of the driven member or the power transmitting member corresponding to the engaging portion and locking the engaging portion. , And is characterized by the following.

According to the invention described in claim 5, claim 3 is provided.
The detent means described above is characterized in that the flange is a roughened surface portion formed on the contact surface between the flange and the power transmission member.

[0010] In the invention according to claim 6, claim 3 is provided.
The detent means described above is characterized in that it is a roughened surface portion formed on the surface of the driven member or the flange of the power transmitting member.

[0011]

According to the first aspect of the present invention, the shear pin press-fitting hole has a fitting portion for fitting and fixing the shear pin, and is formed at the receiving end of the shear pin with a larger diameter than the fitting portion. In order to have a self-supporting guide portion that allows the shear pin to be inserted independently and that allows the center axis of the inserted shear pin and the center axis of the fitting portion to coincide with each other,
First, the shear pin can be easily inserted into the self-supporting guide portion of the shear pin press-fitting hole. Then, the shear pin inserted into the self-supporting guide portion becomes self-supporting in a state where the center axis thereof coincides with the center axis of the shear pin press-fitting hole, so that the shear pin is not obliquely pressed into the shear pin press-fitting hole. Therefore, it is possible to prevent the fragile portion from being damaged and degraded due to the oblique press-fitting, and press-fit and fix the shearpin securely and easily without reducing the shearing performance of the shearpin.

According to the second aspect of the present invention, the one end side of the shear pin is provided with a fitting portion which is fixedly fitted into the shear pin press-fitting hole, and the fitting portion is provided at the end inserted into the shear pin press-fitting hole. In order to provide a self-supporting guide portion which is formed to have a smaller diameter and is free to be inserted into the shear pin press-fitting hole, and self-supports the shear pin with the center axis of the inserted shear pin and the center axis of the shear pin press-fitting hole aligned, Can be easily inserted into the shear pin press-fitting hole. Then, the shear pin inserted into the shear pin press-fitting hole is self-standing by the self-supporting guide portion against the center axis of the shear pin press-fitting hole, so that it is not obliquely pressed into the shear pin press-fitting hole. Therefore, it is possible to prevent the fragile portion from being damaged and degraded due to the oblique press-fitting, and press-fit and fix the shearpin securely and easily without reducing the shearing performance of the shearpin. In addition, the said claim 1,
In the invention described in 2, the system for fastening and fixing the power transmission member and the power transmission member may be any of a caulking system and a bolt-nut system.

According to the third aspect of the present invention, a screw portion is formed at the projecting end of the shear pin projecting from the shear pin insertion hole, a nut is screwed into the screw portion, and the other is fastened and fixed to the one. Power transmission device of the type
On the shear pin, a flange is formed along the edge of the weakened portion of the shear pin along the other edge of the shear pin to abut against the opposing surfaces of the power transmission member and the power transmission member and intervene therebetween. The positioning of the fragile portion becomes extremely easy. Further, even if the power transmission member and the power transmission member are firmly fastened and fixed, a gap corresponding to the thickness of the flange is formed between the two members, so that a predetermined shearing force occurs between the two members when an overload of the auxiliary machine occurs. The force starts to work. Second
In addition, since a detent means is provided between the flange and the power transmission member or the power transmission member to prevent the shear pin from being rotated by the fastening torque of the nut, the shear pin may be rotated by the fastening torque of the nut. Thus, the power transmission member and the power transmission member can be easily fastened and fixed via the shear pin without giving the fastening torque of the nut to the weak portion of the shear pin.

According to the fourth aspect of the present invention, in addition to the effect of the third aspect, the rotation preventing means includes an engaging portion formed on the flange and a power transmission member corresponding to the engaging portion. Alternatively, the power transmission member is formed at a predetermined position, and the locking portion locks the engaging portion. Therefore, it is possible to reliably prevent the shear pin from rotating around.

According to the fifth aspect of the present invention, in addition to the effects of the third aspect of the present invention, in addition to the effect of the third aspect of the present invention, the detent means is provided with a rough surface portion formed on the surface of the flange that is in contact with the driven member or the power transmitting member. As a result, the detent means can be simply configured.

According to the sixth aspect of the present invention, there is provided the third aspect.
In addition to the effects of the invention described above, since the detent means is a roughened surface formed on the surface of the driven member or the flange of the power transmission member, the detent means can be simply configured.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

First Embodiment FIGS. 1 to 4 show a first embodiment of the present invention.
1 shows a power transmission device of an embodiment. The power transmission device of this embodiment is a power transmission device of a compressor (vehicle auxiliary device) of a vehicle air conditioner, and FIG. 1 is a sectional view of the power transmission device of the compressor, and FIG. Front view, FIG. 3
FIG. 4 is an enlarged view of a main part of the power transmission device, FIG. 4 is a perspective view of the shear pin of this embodiment, FIG. 5 is a view showing a step of press-fitting the shear pin into the shear pin press-fitting hole, and FIG. FIG. 7 is an enlarged view of a main part of the power transmission device, showing a shearing state of the shear pin.

As shown in FIGS. 1 and 2, one end of a housing 1 of a compressor as an auxiliary machine for a vehicle is provided with a power source via a belt (not shown) concentrically with a rotating shaft 2 of the compressor. Pulley 3 as a driven member to which a driving force is transmitted from
Is pressed into the inner periphery thereof in advance and mounted.
It is rotatably mounted via.

A drive plate 4 as a power transmission member is attached to an end of the rotating shaft 2, and the drive plate 4 is arranged to face one side of the pulley 3.

The drive plate 4 has a first plate 5 fixed to the end of the rotating shaft 2 and a second plate 5 arranged on the outer peripheral side of the first plate 5 and connected to the first plate 5 via a damper rubber 7. And a plate 6.

The damper rubber 7 is vulcanized and bonded to a flange edge 5a bent on the outer periphery of the first plate 5 and a flange edge 6a bent on the inner periphery of the second plate 6. The first plate 5 and the second plate 6 wrap around the side surface of the pulley 3 opposite to the side surface of the pulley 3 and partially extend so as to elastically contact the side surface of the pulley 3. Here, the side of the pulley 3 and the second
As shown in FIG. 6, the elastic contact portion of the damper rubber 7 which is interposed between the elastic member and the side surface of the plate has a thickness D2 which is smaller by a predetermined thickness D3 than a thickness D1 of a flange 17 of a shear pin 15 described later. It is formed thick.

A bolt insertion hole 8 is formed at the center of the first plate 5, and a boss member 9 is provided on a side surface facing the housing 1 concentrically with the bolt insertion hole 8 by a plurality of rivet pins, for example, three rivet pins. It is fixed by a rivet pin 10 and non-rotatably engages with the end of the rotating shaft 2 of the boss member 9 by a spline engaging means 11 and a screw hole 12 provided at the end of the rotating shaft 2 through the bolt insertion hole 8. Bolt 13
It is screwed and fastened.

The second plate 6 and the pulley 3
Are connected via a plurality of, for example, three shear pins 15 formed of stainless steel. More specifically, one end of the shear pin 15 is press-fitted and fixed in a shear pin press-in hole 19 provided in the pulley 3 to fix the shear pin 1.
5 is inserted into a shear pin insertion hole 18 provided in the second plate 6, and a screw portion 20 formed at a projecting end of the shear pin 15 protruding from the shear pin insertion hole 18.
The second plate 6 and the pulley 3 are connected with each other by screwing a nut. In addition to the stainless steel having high corrosion resistance, for example, the shear pin 15 may be coated with plating or the like beforehand so as to prevent rust from being generated by the outside air, or the pulley 3 may be used.
It may be made of iron or aluminum which has been subjected to coating treatment after press-fitting to improve corrosion resistance.

The shear pin 15 has a notch 16 as a weak portion disposed between the opposing surfaces of the pulley 3 and the second plate 6, and is formed along an edge of the notch 16 near the second plate 6. The pulley 3 is provided with a flange 17 that abuts on each opposing surface of the second plate 6. Therefore, the notch 16 is tapered so that the minimum diameter portion is located at the base of the flange 17.

As shown in FIG. 3, the shear pin press-fitting hole 19 has a fitting portion 26 to which the shear pin 15 is fitted and fixed, and the shear pin 15 is freely and insertably inserted into the receiving end of the shear pin 15. A self-supporting guide portion 27 is provided, which is self-standing by aligning the center axis of the shear pin 15 with the center axis of the fitting portion 26. A taper 28 for guiding the press-fitting into the fitting portion 26 is provided at a joint between the fitting portion 26 and the self-supporting guide portion 27.
Is provided with a taper 29 for absorbing an insertion error.

Also, as shown in FIG.
The flange 17 is provided on its peripheral surface with an engaging portion 30 formed by cutting out a part of the peripheral surface linearly to form a flat surface. On the other hand, a second plate corresponding to the engaging portion 30 is provided. At a predetermined position 6 (see FIG. 3), a locking portion 31 formed by cutting and raising a part of the second plate 6 and bending and forming it toward the pulley 3 side.
Is provided. The locking portion 31 locks the engaging portion 30 of the shear pin 15 so that the shear pin 15 does not rotate when the nut 21 is tightened. That is, the engaging portion 30 and the locking portion 31 constitute a detent means for preventing the shear pin 15 from being entrained by the fastening torque.

In FIG. 1, reference numeral 22 denotes an oil seal interposed between the housing 1 and the rotating shaft 3, reference numeral 23 denotes a snap ring for preventing the oil seal 22 from coming off, and reference numeral 25 denotes a bearing member 24 from which the bearing member 24 comes off. 3 shows a snap ring for stopping.

According to the power transmission device of this embodiment, the shear pin press-fit hole 19 is provided with the fitting portion 26 to which the shear pin 15 is fitted and fixed, and the receiving end of the shear pin 15 is larger than the fitting portion 26. A self-supporting guide portion 27 that is formed to have a diameter and that allows the shear pin 15 to be freely inserted and that allows the shear pin 15 to be self-supported in a state where the center axis of the inserted shear pin 15 and the center axis of the fitting portion 26 are aligned. First, as shown in FIGS. 4A and 4B, the shear pin 15 can be easily inserted into the self-supporting guide portion 27 of the shear pin press-fit hole 19. Then, as shown in FIG. 4C, the shear pin 15 inserted into the self-supporting guide portion 27 becomes self-supporting in a state where the central axis thereof coincides with the central axis of the fitting portion 26 of the shear pin press-fitting hole 19, so that the conventional device The oblique press-fitting of the shear pin 15 into the shear pin press-in hole 19 does not occur (FIGS. 4D and 4E). Therefore, it is possible to prevent the fragile portion from being damaged and degraded due to the oblique press-fitting, and to press-fit the shear pin 15 securely and easily without reducing the shearing performance of the shear pin 15.

In this embodiment, the self-standing guide 2
7 is provided in the shear pin press-in hole 19, for example, as shown in FIG.
May be provided. That is, as shown in FIG.
9 is provided with a fitting portion 32 which is fixedly provided, and is formed at the insertion end portion into the shear pin press-fitting hole 19 to have a smaller diameter than the fitting portion 32, and can be inserted freely and inserted into the shear pin press-fitting hole 19. Center axis of shear pin 15 and press-fit hole 1 for shear pin
The self-standing guide portion 33 may be configured to self-support the shear pin 15 in a state where the center axis of the shear pin 15 is aligned with the center axis of the self-standing guide pin 9.

According to the power transmission of this embodiment, the nut 2 is attached to the threaded portion 20 at the projecting end of the shear pin 15.
In a power transmission device of a type in which the pulley 3 and the drive plate 4 are fastened and fixed by screwing the pulleys 1, first, a drive is carried out on the shear pin 15 along the edge of the notch 16 of the shear pin 15 from the drive plate 4. Since the flange 17 is formed in contact with the opposing surfaces of the plate 4 and the pulley 3 and interposed therebetween, the positioning of the notch 16 is extremely easy by the flange 17. Even if the pulley 3 and the drive port 4 are firmly fastened and fixed, a gap D1 corresponding to the thickness of the flange 17 is formed between the two members 3 and 4, so that when the overload of the auxiliary machine occurs, both members 3 and A predetermined shearing force is reliably applied between the four.
Secondly, since the rotation preventing means for preventing the shear pin 15 from being rotated by the fastening torque of the nut 21 is provided, the fastening torque of the nut 21 is not applied to the notch 16 even if the nut 21 is tightened with a strong force. Thus, the pulley 3 and the drive plate 4 can be securely and easily fixed via the shear pin 15.

According to the power transmission device of this embodiment, the elastic contact portion of the damper rubber 7 interposed and elastically interposed between the side surface of the pulley 3 and the side surface of the second plate as shown in FIG. The thickness D2 of the flange 1 of the shear pin 15
7, the notch 16 of the shear pin 15 is sheared by the restoring force of the damper rubber 7, as shown in FIG. Flange 17 and thickness difference D3 + α
As a result, the drive plate 4 is separated from the side surface of the pulley 3, and the sheared portion of the shear pin 15 does not interfere with the side surface of the pulley 3, so that the pulley 3 can easily idle.

In this embodiment, two engaging portions 30 are provided on the peripheral surface of the flange 17. In the present invention, one engaging portion 30 may be provided, or three or more engaging portions 30 may be provided. Is also good.

On the other hand, the locking portion 31 of this embodiment is provided at a position offset in the radial direction of the drive plate 4 with respect to the shear pin 15, but is provided in the circumferential direction of the drive plate 4 with respect to the shear pin 15. The position may be determined according to the component shapes of the pulley 3 and the drive plate 4. The locking portion 31 of this embodiment is formed by cutting and raising the second plate 6 and bending the second plate 6 toward the pulley 3.
Other shapes and molding methods, such as those formed as protrusions by pressing, may be used.

In the present invention, the detent means is not limited to the above-described embodiment, and other forms of the detent means will be described below. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Second Embodiment FIG. 9 shows a main part of a power transmission device according to a second embodiment, which is an example in which the shapes of the engaging portion and the engaging portion of the first embodiment are modified. .

In the power transmission device of the second embodiment, as shown in FIG. 9, the shape of the flange 17 of the shear pin 15 is a shape other than a perfect circle centered on the central axis of the shear pin 15,
In this example, a flat engagement portion 37 is formed by linearly notching a part of the circular flange 17, and the flange 17 is fitted into the drive plate 4 to form the flange 1.
This is an example in which a concave locking portion 38 for preventing rotation of the lock 7 is provided. In this example, the concave locking portion 38 is formed by press working, and the nut 21 is tightened via the flat washer W in consideration of the flesh that may rise in the thrust direction during the press working. I have.

According to the power transmission device of the second embodiment, similarly to the power transmission device of the first embodiment, even if the nut 21 is tightened with a strong force, the fastening torque of the nut 21 is applied to the notch 16. And the pulley 3 and the drive plate 4 can be reliably and easily connected via the shear pin 15.
Can be fastened and fixed.

Third Embodiment FIG. 10 shows a main part of a power transmission device according to the embodiment, which is an example in which the shapes of the engaging portion and the engaging portion of the first embodiment are modified.

In the power transmission device of the third embodiment, as shown in FIG. 10, a key groove 39 as a locking portion is formed in the shear pin insertion hole 18 of the second plate 6, while the key groove 39 is formed in the shear pin 15. Key part 4 as an engaging part that engages with the key 39
This is an example in which 0 is formed. In this example, the key unit 40
The nut 21 is tightened via the flat washer W in consideration of an adverse effect such that the end portion protrudes from the second plate 6 due to manufacturing variations and is caught on the nut 21.

According to the power transmission device of the third embodiment, similarly to the power transmission devices of the first and second embodiments, even if the nut 21 is tightened with a strong force, the nut 2
1 is not applied, and the pulley 3 and the drive plate 4 can be securely and easily fixed via the shear pin 15.

Here, in particular, according to the detent means of the first to third embodiments, the engaging portions 30, 37, 40 formed on the flange 17 and the engaging portions 30, 37, 40
Are formed at predetermined positions of the drive plate 4 corresponding to
Locking portions 31, 3 for locking the engaging portions 30, 37, 40
8 and 39, the nut 21
Can be prevented from being swirled by the fastening torque.

The shapes of the engaging portion and the locking portion are not limited to the shapes shown in the above-described first to third embodiments. Other shapes may be used. In the above-described first to third embodiments, the example in which the locking portions 31, 38, and 40 are provided on the drive plate 4 has been described, but the engaging portions 30, 38, and 39 of the flange 17 when the nut 21 is screwed. The locking portion may be provided on the pulley 3 as long as the pulley 3 is locked.

Fourth Embodiment: FIG. 11 shows a power transmission device according to a fourth embodiment, in which a detent means is provided with a knurl 34 as a roughened surface formed on the contact surface of the flange 17 with the pulley 3. This is an example formed as According to such a power transmission device, the notch 16 of the shear pin 15
The frictional force acts on the side surface of the flange 17 on the other end side, and even if the nut 21 is tightened with a strong force, the fastening torque of the nut 21 is not applied to the notch 16, so that the notch 16 can be securely and easily inserted through the shear pin 15. Thus, the pulley 3 and the drive plate 4 can be fastened and fixed. Further, since the rotation preventing means is formed as the knurl 34, the rotation preventing means can be easily formed, which contributes to cost reduction.

Fifth Embodiment: FIG. 12 shows a main part of a power transmission device according to a fifth embodiment, in which a detent means is provided as a rough surface formed on a contact surface of the pulley 3 with the flange 17. This is an example in which the knurl 35 is formed. According to such a power transmission device, the same effects as those of the power transmission device according to the fourth embodiment can be obtained. When the knurl 35 is formed on the pulley 3 as described above, the fourth
Compared with the case where the knurl is formed on the flange 17 of the shear pin 15 as in the embodiment, there is an advantage that the knurl processing is easily performed.

When FIGS. 11 and 12 are combined, the knurls 34 of the flanges 17 and the knurls 35 of the pulleys 3 are brought into contact with each other, so that the function of more effectively stopping the rotation of the shear pin can be achieved.

The fourth embodiment (FIG. 11) and the fifth embodiment
The embodiment (FIG. 12) is an example in which knurls 34 and 35 are formed on either of the contact surfaces of the flange 17 and the pulley 3, but the knurl as the detent means of the present invention includes the flange 17 and the drive plate. 4 may be formed on any one of the contact surfaces. Note that the roughness of the knurls 34 and 35 may be set in a range where the shear pin 15 can be prevented from being entrained.

Here, as shown in FIG. 13, a knurl 36 may be provided on the outer peripheral surface of one end of the shear pin 15 for the purpose of adjusting the degree of fitting of the shear pin 15 into the shear pin press-in hole 19 as the knurl. It is conceivable that the knurl as the detent means of the present invention is limited to the one in which a frictional force acts on the flange 17 on the other end side of the notch 16 of the shear pin 15.

[Brief description of the drawings]

FIG. 1 is an overall sectional view showing a first embodiment of a power transmission device of the present invention.

FIG. 2 is a front view of the power transmission device shown in FIG. 1;

FIG. 3 is an enlarged view of a main part of the power transmission device.

FIG. 4 is a perspective view of a shear pin used in the power transmission device.

FIG. 5 is a view showing a step of press-fitting the shear pin, in which FIGS. 5A and 5B are before the press-fitting of the shear pin, FIG. 5C is a self-standing state of the shear pin, and FIG. e is a diagram showing a fixed state of fitting of the shear pin.

FIG. 6 is a view showing a state before nut tightening.

FIG. 7 is a diagram showing a shearing state of a shear pin.

FIG. 8 is a view showing another example of the self-supporting guide section of the present invention.

FIG. 9 is a view showing a main part of a second embodiment of the present invention, in which a separation diagram a is a cross-sectional view, a separation diagram b is a cross-sectional diagram along line AA in the separation diagram a, and a separation diagram c is The perspective view of a shear pin. Sectional view

FIG. 10 is a view showing a main part of a third embodiment of the present invention, in which a separation diagram a is a cross-sectional view, a separation diagram b is a cross-sectional diagram along line EE in the separation diagram a, and a separation diagram c is The perspective view of a shear pin.

FIG. 11 is a view showing a main part of a fourth embodiment of the present invention, in which a separation diagram a is a cross-sectional view, and a separation diagram b shows a shear pin viewed from line BB in the separation diagram a.

FIG. 12 is a view showing a main part of a fourth embodiment of the present invention, in which a diagram a is a sectional view, and a diagram b shows a pulley viewed from line CC in the diagram a.

FIG. 13 is a view showing another example of the knurl, in which FIG. A is a cross-sectional view, and FIG. 13 b is a cross-sectional view along the line DD in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing of vehicle auxiliary equipment 2 Rotary shaft 3 Pulley (power transmission member) 4 Drive plate (power transmission member) 15 Sherpin 16 Notch (fragile part) 17 Flange 18 Sherpin insertion hole 19 Sherpin press-in hole 20 Screw part 21 Nut 26 Fitting part 27 Self-supporting guide part 30 Engaging part 31 Locking part 32 Fitting part 33 Self-supporting guide part 34 Knurling (rough surface part) 35 Knurling (rough surface part) 36 Knurling (rough surface part) 37 Engaging part 38 Locking part 39 Key groove (locking part) 40 Key part (engaging part)

Claims (6)

[Claims] 1. A power transmission member (3) rotatably mounted concentrically with a rotation shaft (2) of an auxiliary device on a housing (1) of a vehicle auxiliary device; A power transmission member (4) fixed and disposed to face the power transmission member (3) in the axial direction of the rotation shaft (2); the power transmission member (3) and the power transmission member (4); And a plurality of shear pins (15) for connecting the power transmission member (3) and the power transmission member (4) with a fragile portion (16) disposed between the surfaces facing the power transmission member. In one of the transmission member (3) and the power transmission member (4), a shear pin press-in hole (19) for press-fitting and fixing one end of the shear pin (15) is formed, and the other end of the shear pin (15) is formed in the other. Forming a shear pin insertion hole (18) through which the other shear pin is inserted. In the power transmission device for fastening and fixing the other by using the said one projecting end portion of the shear pin projecting from (18) (15), said shear pin fitting hole (19), shear pins (15)
And a shaping pin (15) is formed at the receiving end of the shear pin (15) to have a larger diameter than the fitting section (26) so that the shear pin (15) can be inserted and inserted freely. The center axis of the shear pin (15) and the center axis of the fitting portion (26) are aligned with each other.
5) A power transmission device comprising a self-supporting guide portion (27) for self-standing. 2. A power transmission member (3) rotatably mounted concentrically with a rotation shaft (2) of the auxiliary device on a housing (1) of the vehicle auxiliary device; A power transmission member (4) fixed and disposed to face the power transmission member (3) in the axial direction of the rotation shaft (2); the power transmission member (3) and the power transmission member (4); And a plurality of shear pins (15) for connecting the power transmission member (3) and the power transmission member (4) with a fragile portion (16) disposed between the surfaces facing the power transmission member. One of the transmission member (3) and the power transmission member (4) is formed with a shear pin press-in hole (19) for press-fitting and fixing one end of the shear pin (15), and the other is provided with another of the shear pin (15). Forming a shear pin insertion hole (18) through which the other end is inserted; (18) In a power transmission device using the projecting end of a shear pin (15) protruding from the other, the other end is fastened and fixed to the one, wherein one end of the shear pin (15) is inserted into a shear pin press-in hole (19). It is provided with a fitting portion (32) which is fitted and fixed, and is formed with a smaller diameter than the fitting portion (32) at the insertion end into the shear pin press-fitting hole (19) and inserted into the shear pin press-fitting hole (19). Free and inserted shear pin (1
5) A power transmission device comprising a self-supporting guide portion (33) for self-supporting the shear pin with the central axis of 5) being aligned with the central axis of the shear pin press-fit hole (19). 3. A power transmission member (3) rotatably mounted concentrically with a rotation shaft (2) of the auxiliary device on a housing (1) of the vehicle auxiliary device; A power transmission member (4) fixed and disposed to face the power transmission member (3) in the axial direction of the rotation shaft (2); the power transmission member (3) and the power transmission member (4); And a plurality of shear pins (15) for connecting the power transmission member (3) and the power transmission member (4) with a fragile portion (16) disposed between the surfaces facing the power transmission member. One of the transmission member (3) and the power transmission member (4) is formed with a shear pin press-in hole (19) for press-fitting and fixing one end of the shear pin (15), and the other is provided with another of the shear pin (15). Forming a shear pin insertion hole (18) through which the other end is inserted; (18) A thread portion (20) is formed at the projecting end of the shear pin (15), and a nut (21) is screwed into the thread portion (20) to fasten and fix the other to the one. In the power transmission device, the shear pin (15) is provided with a fragile portion (1
6) forming a flange (17) abutting on the opposing surfaces of the power transmission member (3) and the power transmission member (4) along the other edge of the other, and interposed between the two; A nut (21) is provided between the flange (17) and the driven member (3) or the power transmitting member (4).
A power transmission device comprising a rotation preventing means for preventing the shear pin (15) from being rotated by the fastening torque of (1). 4. The locking means comprises an engaging portion formed on the flange and the engaging portion.
40) is formed at a predetermined position of the power transmission member (3) or the power transmission member (4) corresponding to the engagement portion (30, 3).
7, 40), and a locking portion (31, 38, 39) for locking the
The power transmission device according to claim 3, wherein: 5. The non-rotating means is a rough surface portion (34) formed on a contact surface of the flange (17) with the driven power transmission member (3) or the power transmission member (4). The power transmission device according to claim 3. 6. The power transmission member (3), wherein the rotation preventing means is a power transmission member (3).
The power transmission device according to claim 3, wherein the power transmission member (4) is a rough surface portion (35) formed on an abutting surface with the flange (17).