KR101828146B1 - Wet multi-plate clutch having oil lubricating structure - Google Patents

Abstract

The present invention relates to a wet multi-plate clutch, wherein the wet multi-plate clutch (100) includes a housing (10) and a clutch space (15) accommodating the clutch pack (20) is formed in the housing (10). The oil circulation path for fluid communication with the center of the clutch space 15 to the oil raised above the clutch space 15 by the oil churning method by rotation of the clutch pack 20 in the clutch space 15 11 are formed in the housing 10. Thus, by including the oil lubrication path for circulating the oil held in the housing, the efficiency of lubrication and cooling of the clutch as a whole can be increased even if the amount of lubricating oil is reduced. Since the oil level of the lubricating oil is lowered, the rotational resistance can be reduced when the clutch pack or other parts rotate, which can eventually increase the fuel economy of the vehicle.

Description

WET MULTI-PLATE CLUTCH HAVING OIL LUBRICATING STRUCTURE WITH OIL LUBRICANT STRUCTURE

The present invention relates to a wet type multi-plate clutch having an oil lubricating structure, and more particularly, to a wet type multi-plate clutch device capable of reducing a quantity of oil by making a space for collecting and circulating oil to be picked up when the clutch pack rotates will be.

Generally, there are dry clutch and wet clutch in clutch devices used in vehicles, and there are hydraulic type, electric type, and ball ramp type according to the driving type.

In the conventional wet type multi-plate clutch, a certain amount of oil is put into the clutch case, and an oil is lubricated with the oil bath type around the input shaft.

1 is a cross-sectional view showing a conventional wet type multi-plate clutch device.

1, a conventional wet multi-plate clutch 1 includes a plurality of first friction plates 2, a plurality of second friction plates 3 interposed between the first friction plates 2, And a clutch drum (4) interlocked with the second friction plate (3), and the housing (5) rotatably surrounds the components.

The oil chucking method used in such a conventional wet type multi-plate clutch 1 is a method in which the first friction plate 2, the second friction plate 3, the clutch drum 4, and so on are filled with a considerable amount of oil in the housing 5 Lubrication.

When this method is used, the oil supply imbalance at the lower and upper sides is large around the shaft, the efficiency of supplying oil drops, and the oil level must be high for securing the oil supply performance.

This causes an increase in the rotational resistance of rotating parts of the clutch device parts, for example, a clutch drum and the like, and there is a problem in that the total weight and cost are excessively high.

Further, when the rotational resistance is increased, there is also a problem that the fuel consumption is also lowered in a configuration in which the clutch drum and the input shaft are rotated during traveling of the vehicle.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wet type multi-disc clutch which is capable of evenly lubricating rotating parts of a clutch device while reducing the amount of oil in a wet multi-disc clutch.

In order to achieve the above object, an embodiment of the present invention includes a housing, a clutch space formed in the housing to receive a clutch pack, a central portion of the clutch space communicating with an upper portion of the clutch space, Wherein the oil circulation path is formed by the oil circulation path.

And the oil circulation path is constituted by an oil collecting part communicating with the upper part of the clutch space and an oil path communicating with the center part of the clutch space.

The oil collecting portion is a space for collecting the oil spreading upward by the rotation of the clutch pack and the clutch drum. The oil collected in the oil collecting portion flows through the oil passage to the center of the clutch space, and the flowing oil lubricates the rotating input shaft in the center portion, flows into the rotating clutch pack and collects in the lower portion of the housing, The clutch is lubricated by rotation. The oil that is sprayed on the upper part by the centrifugal force of the oil used to lubricate the clutch is collected again into the oil collecting part.

At least a part of the oil passage is inclined downward from the oil collecting part, and at least a part of the oil collecting part is inclined downward toward the oil passage.

The configuration of the oil circulation path may be any configuration as long as it is capable of circulating the oil from the upper portion of the clutch space to the center portion of the clutch space. However, since gravity can be used to easily lubricate the oil without using any additional energy, it is preferable that the oil circulation path be inclined in the direction including the gravity direction component while being connected from the oil collecting portion to the center of the clutch space.

The length and shape of the oil circulation path may be of any length and shape as long as it is optimized for a structure that can most effectively lubricate the clutch with respect to the amount of oil. However, from the viewpoint of lighter weight, it is preferable to have the shortest length.

An oil reservoir may be formed under the housing. This is to store a certain amount of oil and lubricate it by the oil churning method.

According to an embodiment of the present invention, an input shaft is connected to the inner periphery of the clutch pack, and a clutch drum is connected to the outer periphery of the clutch pack.

The clutch pack includes a first friction plate and a second friction plate. The first friction plate is formed with an internal tooth spline coupled with the input shaft, and the second friction plate is formed with a tooth external spline coupled with the clutch drum. And the second friction plate rotates together with the clutch drum. In addition to the first friction plate and the second friction plate, first and second pressure plates having external tooth splines may be included, and both pressure plates may be combined with the clutch drum. The first pressure plate (clutch shim) is positioned between the clutch pack and the piston and can serve as a second friction plate. A second pressure plate (reaction plate) is located between the clutch pack and the clutch drum, Serves as a base bottom surface for securing the contact surface pressure, and also serves as a second friction plate.

The input shaft includes a first coupling portion having a cylindrical shape and the first coupling portion is connected to one end of the input shaft in a flange shape to cover a part of the input shaft and is connected to the inner circumference of the clutch pack. That is, if the input shaft and the first coupling section are viewed from a section cut around the rotation axis of the input shaft, the connection form of the input shaft will be approximately the letter W shape. The input shaft includes a first coupling portion extending in a cylindrical shape toward the clutch pack and then extending in the reverse direction, and the first coupling portion is coupled to the clutch pack, whereby lubricating oil flowing on the outer surface of the input shaft is engaged with the first coupling portion, (By centrifugal force) in the space between the clutch pack and the clutch pack.

The first coupling portion may be in the external tooth form and engage with the internal tooth spline of the first friction plate.

In order to spread the oil radially outward, a plurality of oil holes through which the lubricating oil passes are formed in the first engagement portion. When the oil hole is located below the oil hole, the oil flows down to the oil reservoir. When the oil hole is above the oil hole, the oil can be moved to the oil collector.

The plurality of oil holes may be formed at intervals in the first engaging portion. The oil holes may be formed at intervals of 90 degrees along the circumferential direction of the first engagement portion. However, depending on the amount of oil, the gap may be adjusted for optimal lubrication.

The first coupling portion may include an oil guide extending radially inwardly of the input shaft at the other end not connected to the input shaft body.

The oil guide is a structure for securing a certain amount of oil to be used for lubrication of the clutch pack without oil leakage such as oil that is collected in a portion adjacent to the clutch pack which is the innermost portion of the input shaft, and then escapes to the outside of the input shaft again.

The oil guide may extend close to the input shaft, but it must not be connected or too close. So as to smooth the circulation of the oil. That is, in order for the oil flowing back to the central portion through the oil circulation path to flow into the clutch pack, the oil guide portion and the outer shaft 34 of the input shaft ) Portion of the oil guide, which can be blocked if the oil guide is attached to the input shaft.

According to an embodiment of the present invention, the clutch drum includes a cylindrical second coupling portion, and the second coupling portion has a shape circumferentially surrounding the clutch pack, and is connected to the outer periphery of the clutch pack.

The second engaging portion may have an internal tooth shape and engage with the external tooth spline of the second friction plate.

In the second coupling portion, a plurality of oil holes through which lubricating oil passes are formed. This is a structure for allowing a part of the oil scattered to the outside of the clutch drum through the plurality of oil holes to be collected to the oil collecting part, though it may be used to lubricate a space or a part between the second engaging part and the housing.

And the oil holes of the second engagement portion may be disposed at regular intervals along the circumferential direction of the second engagement portion. And the oil hole of the second coupling portion may be formed in a slit shape long along the rotation axis direction of the clutch drum.

The oil hole of the second engagement portion may be formed at a position corresponding to the opening of the oil collecting portion, and may be formed wider than the opening. The oil hole of the second engagement portion may be formed to overlap with the shape of the opening as viewed from the central axis of the clutch drum, if necessary.

According to an embodiment of the present invention, there is provided a vehicular drive system including a housing, wherein a clutch space is formed in the housing to receive a clutch pack, an oil circulation path is formed to fluidly communicate an upper portion of the clutch space and a center portion of the clutch space, Wherein the oil circulation path is constituted by an oil collecting part communicating with the upper part of the clutch space and an oil path communicating with the center part of the clutch space, the input shaft being connected to the inner periphery of the clutch pack, Wherein the input shaft includes a first coupling portion having a cylindrical shape and the first coupling portion is connected to one end of the input shaft in a flange shape to cover a part of the input shaft and connected to the inner periphery of the clutch pack, The drum includes a cylindrical second coupling portion, and the second coupling portion connects the clutch pack to the circumferential chamber The wrapping of the form, there is provided a wet clutch which is connected to the outer periphery of the clutch pack.

A plurality of first oil holes through which the lubricating oil passes may be formed in the first engagement portion, and a plurality of second oil holes may be formed through the second engagement portion through which the lubricating oil passes.

At least a part of the oil passage may be inclined downward from the oil collecting part.

At least a part of the oil collecting portion may be inclined downward toward the oil passage.

An oil reservoir may be formed under the housing.

The first coupling portion may include an oil guide extending radially inwardly of the input shaft at the other end not connected to the input shaft body.

According to an embodiment of the present invention, the housing may be constructed of two parts and assembled.

The housing may include a case including the oil collecting portion and a cover including the oil passage. When the housing and the case are made of the lid, assembly is facilitated. The case and the cover can be distinguished based on the cross section perpendicular to the rotation axis of the clutch pack. Specifically, it is preferable that the case and the lid are separated from each other on the basis of a cross section of the cross section perpendicular to the rotation axis and located between the clutch pack and the clutch drum and the piston. This is because oil is collected from the clutch pack and clutch drum to the oil collecting part. However, the housing may be divided into two parts based on a cross section parallel to the axis of rotation of the clutch pack, if only the oil circulation path is included.

The wet multi-plate clutch according to the embodiment of the present invention includes an oil lubrication path for circulating the oil held in the housing, so that the efficiency of lubrication and cooling of the clutch as a whole can be increased even if the amount of lubricating oil is reduced. Since the oil level of the lubricating oil is lowered, the rotational resistance can be reduced when the clutch pack or other parts rotate, which can eventually increase the fuel economy of the vehicle.

1 is a cross-sectional view of a conventional wet multi-plate clutch;
2 is an exploded perspective view of a wet type multi-plate clutch according to an embodiment of the present invention;
3 is a front view showing a direction of an oil passage according to an embodiment of the present invention;
4 is a sectional view along AA of Fig. 3; Fig.
5 is a front view showing a case and a clutch drum including an oil collecting part according to an embodiment of the present invention;
FIG. 6 is a perspective view of FIG. 5; FIG.
7 is a side sectional view showing a part of a case and a clutch drum according to an embodiment of the present invention.
FIG. 8 is a perspective view illustrating a first coupling portion and a first oil hole of an input shaft according to an embodiment of the present invention; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a wet multi-plate clutch according to the present invention will be described in detail with reference to the accompanying drawings.

4 illustrates a cross-sectional view of a wet multi-plate clutch 100 according to one embodiment of the present invention. 4 is a cross-sectional view taken along line A-A in Fig. The wet multi-plate clutch 100 includes a housing 10 and a clutch space 15 accommodating the clutch pack 20 is formed in the housing 10. The oil circulation path for fluid communication with the center of the clutch space 15 to the oil raised above the clutch space 15 by the oil churning method by rotation of the clutch pack 20 in the clutch space 15 11 are formed in the housing 10.

The housing 10 can be assembled into two parts and can be composed of a case 10a and a lid 10b. This is for receiving and coupling the clutch pack 20, the input shaft 30, the clutch drum 40, etc., which are accessories of the wet multi-plate clutch.

The oil circulation path 11 is composed of an oil collecting portion 11a and an oil passage 11b. The oil collecting portion 11a communicating with the upper portion of the clutch space 15 is formed in the case 10a and the oil passage 11b communicating with the center portion of the clutch space 15 is formed in the lid 10b do.

3 and 4, at least a part of the oil passage 11b has a downwardly inclined portion from the oil collecting portion 11a. This is to allow the oil collected in the oil collecting portion 11a to be circulated back to the center of the clutch space 15. [ The oil thus returned to the central portion lubricates the input shaft 30 and then flows down to the lower portion of the clutch space 15 or flows into the clutch pack 20 through the first oil hole 31 by centrifugal force, The whole can be lubricated and cooled. At this time, other accessories such as pistons and bearings can also be lubricated and cooled at the same time.

It can be understood that the oil collecting portion 11a can also have a downward inclined portion if it contributes to the oil circulation, just as at least a part of the oil passage 11b has a downward inclined portion from the oil collecting portion 11a There will be.

In the lower portion of the housing 10, an oil storage portion 14 in which circulated oil is collected by gravity is formed. When a predetermined amount of oil is contained in the oil reservoir 14, the lubricating oil is circulated in the wet multi-plate clutch by the rotation of the clutch pack 20.

4, the input shaft 30 is connected to the inner periphery of the clutch pack 20 to transmit power, and the clutch drum 40 is connected to the outer periphery of the clutch pack 20, 20), the friction plates come into contact with each other and transmit power to the output side.

Referring to Figs. 5 and 6, the oil collecting portion 11a is shown in more detail. In this embodiment, the oil collecting portion 11a is located substantially above the clutch space 15. [ A passage for oil passage is formed between the oil collecting portion 11a and the clutch space 15. The passage extends in the direction tangential to the circumference of the circular clutch space 15 so that the oil can naturally be collected into the oil collecting portion 11a when the oil is carried up by the strong rotation of the clutch pack 20 And reaches the oil collecting portion 11a. As the passage between the oil collecting portion 11a and the clutch space 15 is closer to the gravity direction, the collected oil may fall back into the clutch space 15. However, when the clutch pack 20 is strongly rotated, The amount of the oil is increased upwardly, so that the oil can be circulated to the center of the clutch space 15 along the oil passage 11b.

Referring to Figs. 5 and 6, an actuator portion 60 is provided on the clutch space 15 side. An actuator acts on the actuator 60 to adjust the pressure of the piston. A partition wall 50 is formed between the actuator portion 60 and the clutch space 15. The height of the partition wall 50 may be adjusted at the time of initial design so that the amount of oil between the actuator portion 60 and the clutch space 15 can be adjusted. That is, the same oil can be used as the lubricant oil in the clutch space 15 and the operating oil of the actuator portion 60. In order that the hydraulic oil required for the actuator portion 60 can always be stored in the actuator portion 60, And a partition wall 50 is provided between the space 15 and the actuator unit 60. As a result, even when the oil is scattered by the rotation of the clutch pack and flows into the actuator unit 60, if the flow exceeds the height of the partition 50, the oil passes again to the clutch space 15.

Referring to Fig. 7, the path through which the oil is moved from the clutch space 15 to the oil collecting portion 11a can be seen from the other side. The clutch drum 40 is accommodated in a part of the clutch space 15 formed in the case 10a. The second oil holes 42 are arranged along the circumferential direction of the clutch drum 40. When the clutch pack 20 rotates, the oil in the clutch pack 20 is moved radially outwardly by centrifugal force as the clutch drum 40 rotates together. The moved oil is uniformly sprayed toward the inner wall of the case 10a through the second oil holes 42, and a part of the oil is collected by the oil collecting portion 11a. Therefore, the oil collected in the oil collecting section 11a flows through the oil passage 11b formed in the lid 10b, and can be circulated to the center of the clutch space 15 again.

8 is a perspective view specifically showing a first engaging portion 31 formed at one end of the input shaft 30, a first oil hole 32, and an oil guide 33. Fig. The input shaft can transmit power by engaging the first engagement portion 31 with the inner circumference of the clutch pack, more precisely with the inner tooth spline of the first friction plate. Therefore, the first coupling portion 31 has the external tooth spline formed with the outside tooth portion as shown in the drawing.

The first coupling portion 31 is formed at one end of the input shaft 30. The first coupling portion 31 has a cylindrical shape extending from one end of the input shaft 30 to the other end of the input shaft 30 outside the main body of the input shaft 30. An oil guide 33 is formed at the extended end of the first coupling portion 31. In the present embodiment, a plurality of first oil holes 32 are formed in a line in the axial direction between the teeth of the first engaging portion 31. The plurality of first oil holes 32 may be periodically formed at regular angles of the cylindrical portion for even distribution of the oil, and are formed at intervals of 90 degrees in the present embodiment.

The oil present between the first engaging portion 31 and the input shaft 30 of the oil adhering to the outer wall 34 of the input shaft 30 in accordance with the rotation of the input shaft 30 passes through the first oil hole 32 ). The oil escapes between the friction plates of the clutch pack 20. At this time, in order to distribute the oil evenly, the shape of the first oil hole 32 may be formed in a partially inclined shape as shown in FIG.

The cross section of the input shaft 30 generally increases in radius from the input side to the output side. With this structure, the effect of collecting oil into the space between the first coupling portion 31 and the input shaft 30 can be achieved by the centrifugal force due to the rotation of the input shaft 30. [ At this time, the oil guide 33 is formed so that the collected oil does not come out again. The oil guide 33 extends from one end of the first engaging part 31 toward the outer wall 34 of the input shaft 30 but is configured not to contact the outer wall 34 to allow oil to pass therethrough.

In the case of the conventional clutch, since the oil level of the lubricating oil rises to 7 mm below the rotation axis of the input shaft, half of the lubricating oil is immersed in the oil, whereas according to the embodiment of the present invention, the lubricating oil can be filled only 22 mm below the rotation axis. Can be significantly reduced. The difference in oil level in the non-rotating state produces an effect of reducing the rotational resistance by generating a difference in oil level even in the rotating state.

10: Housing
10a: Case
10b: cover
11: Oil circulation path
11a: oil collecting portion
11b:
14: Oil reservoir
15: clutch space
20: clutch pack
30: input shaft
31:
32: first oil hole
33: Oil guide
34: outer wall
40: clutch drum
41:
42: Second oil hole
50: partition wall
60: actuator section
70: flange portion

Claims (20)

And a housing (10)
The housing 10 is formed with a clutch space 15 for receiving the clutch pack 20 and an oil circulation path 11 for fluidly connecting the upper portion of the clutch space 15 and the central portion of the clutch space 15. [ Is formed,
An input shaft 30 is connected to the inner periphery of the clutch pack 20, a clutch drum 40 is connected to the outer periphery of the clutch pack 20,
The input shaft 30 includes a cylindrical first coupling portion 31,
The first coupling portion 31 is coupled to the inner periphery of the clutch pack 20,
A plurality of first oil holes (32) through which lubricating oil passes are formed in the first engaging part (31)
The cross section of the input shaft 30 increases in radius from the input side toward the first engaging portion 31 so that the first engaging portion 31 and the input shaft 30 are rotated by the centrifugal force generated by the rotation of the input shaft 30. [ (100). ≪ / RTI > The method according to claim 1,
Wherein the oil circulation path 11 is constituted by an oil collecting portion 11a communicating with the upper portion of the clutch space 15 and an oil passage 11b communicating with the center portion of the clutch space 15. [ 3. The method of claim 2,
At least a part of the oil passage (11b) is inclined downward from the oil collecting portion (11a). 3. The method of claim 2,
At least a part of the oil collecting portion (11a) is inclined downward toward the oil passage (11b). 3. The method of claim 2,
And an oil reservoir (14) is formed under the housing (10). delete delete delete The method according to claim 1,
Wherein the plurality of first oil holes (32) are formed at intervals of 90 degrees. 10. The method of claim 9,
Wherein the first coupling portion (31) includes an oil guide (33) extending radially inward of the input shaft (30). The method according to claim 1,
The clutch drum 40 includes a cylindrical second engagement portion 41,
Wherein the second engaging portion (41) is configured to surround the clutch pack (20) in a circumferential direction and is coupled to an outer periphery of the clutch pack (20). 12. The method of claim 11,
And a second plurality of oil holes (42) through which lubricating oil passes are formed in the second engagement portion (41). And a housing (10)
The housing 10 is formed with a clutch space 15 for receiving the clutch pack 20 and an oil circulation path 11 for fluidly connecting the upper portion of the clutch space 15 and the central portion of the clutch space 15. [ Is formed,
The oil circulation passage 11 is constituted by an oil collecting portion 11a communicating with the upper portion of the clutch space 15 and an oil passage 11b communicating with the center portion of the clutch space 15,
An input shaft 30 is coupled to the inner periphery of the clutch pack 20, a clutch drum 40 is coupled to the outer periphery of the clutch pack 20,
The input shaft 30 includes a cylindrical first coupling portion 31. The first coupling portion 31 is connected to the inner periphery of the clutch pack 20,
Wherein the clutch drum 40 includes a cylindrical second coupling portion 41 and the second coupling portion 41 has a shape circumferentially surrounding the clutch pack 20, Respectively,
A plurality of first oil holes (32) through which lubricating oil passes are formed in the first engaging part (31)
The cross section of the input shaft 30 increases in radius from the input side toward the first engaging portion 31 so that the first engaging portion 31 and the input shaft 30 are rotated by the centrifugal force generated by the rotation of the input shaft 30. [ (100). ≪ / RTI > 14. The method of claim 13,
And a second plurality of oil holes (42) through which lubricating oil passes are formed in the second engagement portion (41). 15. The method of claim 14,
At least a part of the oil passage (11b) is inclined downward from the oil collecting portion (11a). 15. The method of claim 14,
At least a part of the oil collecting portion (11a) is inclined downward toward the oil passage (11b). 15. The method of claim 14,
And an oil reservoir (14) is formed under the housing (10). 15. The method of claim 14,
Wherein the first coupling portion includes an oil guide that extends radially inwardly of the input shaft at the other end that is not connected to the main body of the input shaft. The method according to claim 1,
The housing (10) can be assembled and assembled in two parts. 3. The method of claim 2,
The housing (10) includes a case (10a) including the oil collecting portion (11a) and a lid (10b) including the oil passage (11b).

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