JPH09152017A - Gear tooth noise preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically reduce the thrust clearance of a gear and decrease the backlash so as to prevent generation of gear tooth noise by providing an elastic member and a connecting member on the step difference between a first thrust receiving member and a second thrust receiving member. SOLUTION: The thrust pressure part 110 of a first thrust receiving member 100 and a second thrust pressure receiving member 102 are connected together through rivets 106. A first reverse idler gear 80 is pressed by a belleville spring 104 through the second side pressure receiving member 102. Hereby, a thrust clearance becomes automatically small, and the backlash of the first reverse idler gear 80 is reduced so as to be able to prevent gear tooth noise from generating. Namely, cushioning function is given to a gear tooth noise preventing mechanism 98, and rattle noise at idling of the first reverse idler gear 80 can be restrained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear rattle noise prevention device, and more particularly to a gear rattle noise preventive device capable of preventing generation of gear rattle noise with a simple structure.

[0002]

2. Description of the Related Art A vehicle is equipped with a manual or automatic transmission in order to convert a driving force of an engine into a desired one in accordance with a driving condition and take it out. As such a transmission, there are a gear type transmission, a belt type transmission, and the like, and a gear type transmission with little driving force transmission loss is often used. The gear type transmission includes a constant mesh type and a selective sliding type.

As a gear type transmission, there is one shown in FIG. That is, in FIG. 4, 202 is a transmission, and 204
Is a transmission gear unit, 206 is a differential unit, and 208 is a transmission case. This transmission case 2
An input shaft 210, a counter shaft 212, and a reverse idler shaft 214 are arranged in the 08 in parallel with the longitudinal direction of the transmission 202.

The input shaft 210 is held by the first input shaft bearing 220 held by the first wall 218 of the first case 216 of the transmission case 208 and the second wall 224 of the second case 222 of the transmission case 208. It is rotatably supported by the second input shaft bearing 226.

The counter shaft 212 is disposed slightly on the differential portion 206 side, and the first counter shaft bearing 228 and the second case 222 are held by the first wall portion 218 of the first case 216.
Second counter shaft bearing 2 held by the second wall portion 224 of the
It is rotatably supported by 30 and.

The reverse idler shaft 214 has a differential section 20.
6, the first wall portion 218 and the second case 222 are separated from each other.
It is supported by a holding bolt 232 that is attached to the.

The input shaft 210 is provided with a first speed input gear 234 and a second speed input gear 236, which are sequentially fixed from the engine side, as a plurality of speeds of each speed input gear, and a third speed input gear. A 238, a fourth speed input gear 240 and a fifth speed input gear 242 are rotatably provided. The fifth speed input gear 242 is arranged outside the second wall portion 224.

A final drive gear 246 constituting a final reduction mechanism 244 is fixedly provided on the counter shaft 212 as a plurality of stages of respective speed counter gears sequentially from the engine side, and a first speed input gear 234 is provided. 1 to mesh
A speed counter gear 248 is rotatably provided,
A second speed counter gear 250 that meshes with a third speed input gear 236 is rotatably provided, and a third speed counter gear 252 and a fourth speed input gear 240 that mesh with a third speed input gear 238.
4th speed counter gear 254 and 5th speed input gear 24
A 5-speed counter gear 256 that meshes with 2 is fixedly provided. The fifth speed counter gear 256 is arranged outside the second wall portion 224.

5th speed input gear 242 and 5th speed counter gear 2
56 is covered with a side cover 258.

The counter shaft 212 between the first speed counter gear 248 and the second speed counter gear 250 has a first speed / second speed switching sleeve 260 and a reverse counter gear 262, which are integrally configured, to switch the first speed / second speed. A mechanism 264 is provided.

Third speed input gear 238 and fourth speed input gear 240
The input shaft 210 in between is provided with a third speed / fourth speed switching mechanism 268 having a third speed / fourth speed switching sleeve 266.

A 5-speed switching mechanism 27 having a 5-speed switching hare 270 on the input shaft 210 near the 5-speed input gear 242.
2 are provided.

A final driven gear 274 is meshed with the final drive gear 246 of the counter shaft 212. This final driven gear 2
The gear 74 is fixed to the differential case 276 of the differential portion 206 by a gear mounting bolt 278.

The reverse idler shaft 214 has a first reverse idler gear 280 which meshes with the first speed input gear 234.
Is rotatably provided via a second needle bearing 282, and a second reverse idler gear 284 is rotatably provided side by side with the first reverse idler gear 280 via a second needle bearing 286.
The second reverse idler gear 284 meshes with the reverse counter gear 262.

A reverse switching mechanism 290 having a reverse switching sleeve 288 is provided between the first reverse idler gear 280 and the second reverse idler gear 284.

As described above, some transmissions having a plurality of gears and the like have a disc spring or the like in order to prevent generation of gear noise by receiving a thrust load.

Structures having such disc springs are disclosed in, for example, Japanese Utility Model Laid-Open No. 58-182033, Japanese Utility Model Laid-Open No. 56-8947, and Japanese Utility Model Laid-Open No. 1-98362. The one disclosed in Japanese Utility Model Application Laid-Open No. 58-182033 comprises a disc spring and first and second receiving fittings respectively abutting on both sides of the disc spring in the axial direction. At least one of the receiving fittings is a dish. The spring is engaged with the inner diameter or the outer diameter of the shaped spring and is movable in the axial direction and is engaged with the radial direction. The one disclosed in Japanese Utility Model Laid-Open No. 56-8947 discloses a plurality of axially superposed disc springs, and a first spring which is loosely inserted into the through holes of the disc springs and prevents the disc springs from separating from one end. A support member provided with a seat, a second spring seat loosely fitted to the other end of the support member, and a locking portion provided at the other end of the support member to prevent separation of the second spring seat. Is provided. Actual Kaihei 1-9836
The one disclosed in Japanese Patent Publication No. 2 is provided with an idling gear rotatably mounted on a shaft member and a gear meshing with the idling gear, and an opening chamber opening toward the axial center of the idling gear is in a radial direction. The friction member facing the shaft member and the spring member for urging the friction member in the direction of pressing the shaft member are loosely fitted in the opening chamber. The spring constant is set so that it is greater than the centrifugal force that acts on the friction member when the gear rotates at low speed, and less than the centrifugal force that acts on the friction member when the idle gear rotates at high speed. .

[0018]

However, in the transmission as shown in FIG. 4, a plurality of parts are combined,
Therefore, there is an inconvenience that the accumulated tolerance causes an increase in thrust clear rank, an increase in backlash, and an increase in the generation of gear rattling noise.

Further, in the above-mentioned publication, there is an inconvenience that the structure becomes complicated.

[0020]

In order to eliminate the above-mentioned inconvenience, the present invention provides a first side pressure receiving member in which a gear is rotatably provided on a support shaft and a step is formed on the support shaft. A second side pressure receiving member that is disposed on the step of the first side pressure receiving member and is located on the gear side is provided, and is disposed on the step between the first side pressure receiving member and the second side pressure receiving member. An elastic member for generating a pressing force on the gear is provided, and a connecting member for connecting the first side pressure receiving member and the second side pressure receiving member is provided.

A gear is rotatably provided on the support shaft, a first side pressure receiving member is provided on the support shaft, and a second side pressure receiving member facing the first side pressure receiving member is located on the gear side. An elastic member is provided between the first side pressure receiving member and the second side pressure receiving member to generate a pressing force on the gear, and the first side pressure receiving member and the second side pressure receiving member are provided. It is characterized in that a connecting member for connecting is provided, and the connecting member is disposed in a meat-thief portion formed by being depressed in a side surface of the gear.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, since the gear is pushed by the pressing force of the elastic member, the thrust clearance of the gear is automatically reduced, the backlash is reduced, and the occurrence of gear rattling noise is prevented. It is possible to suppress rattle noise and rattle noise (rattle noise) when idling. Further, the conventional assembling method can be used as it is, and the configuration can be simplified. Further, since the bearing that supports the gear is not pushed, the positioning of the gear can be simplified.

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; 1 to 3 show an embodiment of the present invention. In FIG. 3, reference numeral 2 is a transmission, 4 is a transmission gear unit, 6 is a differential unit, and 8 is a transmission case. In the transmission case 8, the input shaft 10, the counter shaft 12, the reverse idler shaft 1
4 are arranged parallel to the longitudinal direction of the transmission 2.

The input shaft 10 is held by the first input shaft bearing 20 held by the first wall portion 18 of the first case 16 of the transmission case 8 and the second wall portion 24 of the second case 22 of the transmission case 8. It is rotatably supported by the second input shaft bearing 26.

The counter shaft 12 is disposed slightly on the differential portion 6 side and is held by the first wall portion 18 of the first case 16 in the first direction.
Counter shaft bearing 28 and second wall portion 24 of second case 22
It is rotatably supported by the second counter shaft bearing 30 held by.

The reverse idler shaft 14 is supported by the holding bolt 32 inserted into the first wall portion 18 and the second case 22 at a position apart from the differential portion 6.

The input shaft 10 is provided with a first speed input gear 34 and a second speed input gear 36, which are fixed in sequence from the engine side, as a plurality of speeds of each speed input gear, and 3 speeds.
High speed input gear 38, fourth speed input gear 40 and fifth speed input gear 42
Are rotatably provided. The fifth speed input gear 42 is
It is arranged outside the second wall portion 24.

The counter shaft 12 is provided with a plurality of stages of respective speed counter gears, which are sequentially arranged from the engine side in a final reduction mechanism 4.
4 is fixedly provided, a first speed counter gear 48 that meshes with the first speed input gear 34 is rotatably provided, and a second speed counter that meshes with a second speed input gear 36. A gear 50 is rotatably provided, and a third speed counter gear 52 meshing with the third speed input gear 38, a fourth speed counter gear 54 meshing with the fourth speed input gear 40, and a fifth speed meshing with the fifth speed input gear 42. The counter gear 56 is fixedly provided. The fifth speed counter gear 56 is arranged outside the second wall portion 24.

5th speed input gear 42 and 5th speed counter gear 56
And are covered by the side cover 58.

The counter shaft 12 between the first speed counter gear 48 and the second speed counter gear 50 has a first speed / second speed switching sleeve 60 and a reverse counter gear 62 which are integrally formed. A mechanism 64 is provided.

The input shaft 10 between the third speed input gear 38 and the fourth speed landing gear 40 is provided with a third speed / fourth speed switching mechanism 68 having a third speed / fourth speed switching sleeve 66.

In the input shaft 10 near the fifth speed input gear 42,
A 5-speed switching mechanism 72 having a 5-speed switching sleeve 70 is provided.

A final driven gear 74 is provided in mesh with the final drive gear 46 of the counter shaft 12. The final driven gear 74 is fixed to the differential case 76 of the differential unit 6 with gear mounting bolts 78.

The reverse idler shaft 14 is provided with a first reverse idler gear 80 which meshes with the first speed input gear 34.
It is rotatably provided via a needle bearing 82,
In addition, the second reverse idler gear 80 is lined up with the second reverse idler gear 80.
The reverse idler gear 84 is the second needle bearing 8
It is rotatably provided via 6. One side of the second reverse idler gear 84 is the reverse idler shaft 14
It is engaged with the reverse counter gear 62 by being locked by the locking flange 14 a protrudingly provided on the.

A reverse switching mechanism 90 having a reverse switching sleeve 88 is provided between the first reverse idler gear 80 and the second reverse idler gear 84.

That is, in the first reverse idler gear 80, a hub side spline 94 is formed on the hub 92 on the second reverse idler gear 84 side, and the hub side spline 9 is formed.
4, a reverse switching sleeve 88 is provided so as to be movable in the axial direction.

A gear side spline 96 is formed on the second reverse idler gear 84 on the first reverse idler gear 80 side. A reverse switching sleeve 88 that moves in the axial direction is engaged with the gear side spline 96.
Will be withdrawn.

A rattling noise prevention mechanism 98 is provided between the first reverse idler gear 80 and the base portion 18a of the first wall portion 18.

In the reverse idler shaft 14, the diameter D ₁ of the portion where the gear rattling noise prevention mechanism 98 is provided is smaller than the diameter D _{2 of} the portion where the first reverse idler gear 80 is located.

The rattling noise prevention mechanism 98 has a structure in which the thrust washer is divided, and the first side receiving member 100, the second side receiving portion 102, the disc spring 104 as an elastic member, and the rivet 106 as a connecting member. Consists of.

The first side pressure receiving member 100 is provided with a shaft engaging portion 108 provided on the reverse idler shaft 14 which is a supporting shaft so as to be axially movable and non-rotatable, and the shaft engaging portion 10.
8 and a lateral pressure portion 110 extending in the radial direction. The first side pressure receiving member 100 includes a shaft engaging portion 108.
A step space 114 is formed by the step surface 112 between the side pressure part 110 and the side pressure part 110. Thereby, the shaft engaging portion 10
The gear side surface 108 a of No. 8 is the step surface 14 b of the reverse idler shaft 14 and the end surface 82 of the first needle bearing 82.
a.

A second side pressure receiving member 102, which is located on the first reverse idler gear 80 side and faces the side pressure portion 110, is disposed in the step space 114.

In the step space 114, the step surface 112 is provided between the side pressure portion 110 and the second side receiving member 102.
Is provided with a disc spring 104. This disc spring 104
Is to generate a pressing force for pressing the first reverse idler gear 80 via the second side pressure receiving member 102.

The side pressure portion 110 and the second side pressure receiving member 102 are connected by a rivet 106 oriented in the axial direction. In this rivet 106, one end portion 106 a has the side pressure portion 1
10 is engaged with the first engaging hole 116 of the second side pressure receiving member 102 and the other end portion 106b is engaged with the second engaging hole 118 of the second side pressure receiving member 102.
1 and is located in the meat-thief portion 120 formed by recessing the side surface of the first reverse idler gear 80 as shown in FIG.

As shown in FIG. 2, the first side pressure receiving member 100
And the second side pressure receiving member 102, the disc spring 104, and the rivet 1.
In the rattling noise prevention mechanism 98 including No. 06, the side pressure portion 110 of the first side pressure receiving member 100 and the second side pressure receiving member 1
The width A of the portion where 02 is connected to the rivet 106 is the first
It is slightly larger than the width B of the shaft engaging portion 108 of the side pressure receiving member 100.

Next, the operation of this embodiment will be described.

When the rattling noise preventing mechanism 98 is attached to the reverse idler shaft 14, the side pressure portion 110 of the first side pressure receiving member 100 and the second side pressure receiving member 102 are riveted to each other.
Since the width A of the portion connected by is larger than the width B of the shaft engaging portion 108 of the first side pressure receiving member 100, the disc spring 104 causes the first reverse idler gear 80 to pass through the second side pressure receiving member 102. By pressing, the thrust clearance is automatically reduced, the backlash of the first reverse idler gear 80 is reduced, and the occurrence of gear rattling noise can be prevented. That is, the rattling noise prevention mechanism 98 has a cushioning function to reduce the thrust clearance when the first reverse idler gear 80 freely rotates. As a result, rattling noise and rattle noise when the first reverse idler gear 80 idles can be suppressed.

The second side pressure receiving member 102 contacts only the first reverse idler gear 80 and does not contact the end surface of the first needle bare link 82, while the gear side surface 108a of the shaft engaging portion 108 is the reverse idler shaft. Step surface 1 of 14
4a and the end surface 82a of the first needle bearing 82 are only brought into contact with each other, so that positioning can be performed easily.

Further, the conventional method of assembling the transmission can be used as it is, and the generation of the rattling noise can be prevented with a simple structure.

Furthermore, since the rivet 106 is located at the meat-thickening portion 120 of the first reverse idler gear 80, the degree of freedom in design can be increased.

In this embodiment, the gear rattling noise prevention mechanism 98 is provided on the reverse idler shaft 14 as a support shaft, but the gear rattling noise prevention mechanism 98 is provided on another support shaft such as the input shaft 10. Alternatively, it may be provided in a transmission having another helical gear, or in a gear mechanism other than the transmission.

[0052]

As is apparent from the above detailed description, according to the present invention, a gear is rotatably provided on a support shaft, and a first side pressure receiving member having a step is formed on the support shaft. A second side pressure receiving member disposed on the step of the receiving member and located on the gear side is provided, and an elastic member disposed on the step between the first side pressure receiving member and the second side pressure receiving member to generate a pressing force on the gear. By providing the connecting member that connects the first side pressure receiving member and the second side pressure receiving member, the thrust clearance of the gear is automatically reduced, the backlash is reduced, and the occurrence of gear rattling noise is prevented. As a result, rattle noise and rattle noise during idling can be suppressed.

Further, the conventional method of assembling the transmission can be used as it is, and the structure can be simplified.

Further, since the bearing for supporting the gear is not pushed, the positioning of the gear can be simplified.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view of a transmission including a rattling noise prevention mechanism.

FIG. 2 is a configuration diagram of a rattling noise prevention mechanism.

FIG. 3 is a configuration diagram of a transmission.

FIG. 4 is a configuration diagram of a conventional transmission.

[Explanation of symbols]

 2 transmission 10 input shaft 12 counter shaft 14 reverse idler shaft 98 tooth rattling noise prevention mechanism 100 first side pressure receiving member 102 second side pressure receiving member 104 disc spring 106 rivet 112 step surface 114 step space 120 meat steal portion

Claims (2)

[Claims] 1. A gear is rotatably provided on a support shaft, a first side pressure receiving member having a step is formed on the support shaft, and the first side pressure receiving member is disposed on the step of the first side pressure receiving member and is provided on the gear side. A second side pressure receiving member is provided, and an elastic member is provided at the step between the first side pressure receiving member and the second side pressure receiving member to generate a pressing force on the gear. A gear tooth rattling noise prevention device comprising a connecting member for connecting a receiving member and the second side pressure receiving member. 2. A gear is rotatably provided on the support shaft, a first side pressure receiving member is provided on the support shaft, and a second side pressure receiving member located on the gear side in opposition to the first side pressure receiving member is provided. An elastic member is provided between the first side pressure receiving member and the second side pressure receiving member to generate a pressing force on the gear, and the first side pressure receiving member and the second side pressure receiving member are provided. A gear rattling noise prevention device, characterized in that a coupling member for coupling is provided, and the coupling member is disposed in a meat-thief portion formed by recessing in a side surface of the gear.