JP3138150B2 - Gear noise prevention device for gear type power transmission mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a meshing noise prevention device for a gear type power transmission mechanism mounted on an automobile or the like.

[0002]

2. Description of the Related Art The above-mentioned meshing sound preventing device is disclosed in Japanese Utility Model Laid-Open Publication No. 64-43261.

[0003] According to this, a gear is rotatably supported around a shaft supported by a casing or the like, and a washer is fixedly fitted to the support shaft by external fitting. An elastic body is interposed between one end face in the axial direction of the gear and the opposing face of the washer facing the one end face. The elastic body is fitted and attached to a groove formed on the facing surface of the washer, and the elastic body elastically resilients one end surface of the gear and the facing surface of the washer in the axial direction opposite to each other. Pressing.

[0004] By the frictional force between the support shaft and the gear due to the pressing of the elastic body, the rotation of the gear freely with respect to the support shaft is regulated, and the gear can easily rattle against the support shaft. Is suppressed.

[0005] As a result, the occurrence of meshing noise between the gear and another gear meshing with the gear is prevented.

[0006]

According to the above-mentioned conventional structure, the elastic body is fitted in a washer and is attached to the washer, and the washer is attached to the support shaft from one axial end thereof. It is attached in a fitting manner.

For this reason, when assembling the elastic body, first, the support shaft before assembling into a casing or the like is
In addition to assembling the gear, it is required to assemble a washer in which the elastic body is previously fitted. Therefore, the assembling of the elastic body is complicated because the assembling of the support shaft and the gear is related to the assembling of the elastic body.

Further, in the above-mentioned conventional structure, the elastic body is fitted in the groove formed in the washer, and the structure of the meshing sound preventing device which includes these elastic members is complicated. Therefore, the molding of this device may be complicated.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances. In order to prevent the gear from rattling with respect to the fixed member, an elastic body for pressing the gear is provided. It is an object of the present invention to make it easy to assemble the elastic body .

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, a gear-type power transmission mechanism according to the present invention has a meshing sound preventing device.
A gear 18 is rotatably supported on a support shaft 13 supported by the casing 3 around its axis 8. One end face 19 of the gear 18 in the axial direction and the case facing the one end face 19 are arranged.
21 between the opposed surface 20 of the fixed side member 2 such as the ring 3
An elastic body 32 is interposed between the gears 18.
In the meshing noise prevention device of the gear type power transmission mechanism, the one end surface 19 and the opposing surface 20 of the fixed member are elastically pressed in opposite directions in the axial direction.

A notch 34 is formed in the elastic body 32,
The elastic body 32 can be fitted into the gap 21 from outside in the radial direction of the gear 18 , and when the fitting is performed,
The notch 34 is fitted to a halfway portion of the support shaft 13 in the axial direction.
It is made to match .

[0012]

[Operation] The operation of the above configuration is as follows.

One end face 19 of the gear 18 facing each other;
An elastic body 32 is provided in a gap 21 between the fixed side member 2 and the facing surface 20 of the casing 3. The elastic body 32 connects the one end face 19 and the facing surface 20 in the axial direction of the gear 18. They are elastically pressed in opposite directions.

Therefore, the gear 18 is restricted from freely rotating with respect to the fixed side member 2 by the frictional force between the fixed side member 2 and the gear 18 due to the pressing of the elastic body 32. The play of the gear 18 against the fixed-side member 2 is suppressed.

Then, the gear 18 and
The generation of meshing noise between the gears 29 and 30 meshing with the gears 29 and 30 is suppressed.

In the above structure, the elastic body 3
2, a notch 34 is formed so that the elastic body 32 can be fitted into the gap 21 from the radial outside of the gear 18 ,
When this fitting is performed, the notch 34 is
Are the so that the match fit with the axial direction of the intermediate portion 3.

For this reason, the assembly of the elastic body 32 is as follows.
This can be performed after the assembly of the gear 18 to the fixed member 2 is completed, that is, the assembly of the elastic body 32 can be performed without relating to the assembly of the gear 18.

Further , as described above, the gap 21
When the elastic body 32 can be fitted and this fitting is performed.
The notch 34 is located in the middle of the support shaft 13 in the axial direction.
Is fitted.

Therefore, when assembling the elastic body 32,
The positioning of the elastic body 32 in the gap 21 is automatically performed.
Can be done

[0020]

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

In FIG. 1, reference numeral 1 denotes a gear type power transmission mechanism 1 of a transfer mounted on an automobile. In addition, the arrow Fr in the figure indicates the front of the vehicle, and the left and right described below refer to the direction toward the front.

The power transmission mechanism 1 has a casing 3 which forms a part of the fixed side member 2. The casing 3 has left and right side walls 4 and 5 facing each other apart from each other left and right, and the space between the left and right side walls 4 and 5 is an internal space 6 of the casing 3.

A circular through hole 9 is formed in the left side wall 4 so that an axis 8 extends left and right. A boss 10 is integrally formed on the inner surface of the right side wall 5 on the axis 8. A circular bottomed hole 11 is formed in the boss 10 on the shaft center 8.

A support shaft 13 having a circular cross section is provided on the shaft center 8, and this support shaft 13 also constitutes a part of the fixed member 2. The support shaft 13 is housed in the internal space 6 from the left side of the casing 3 through the through hole 9, the left end of the support shaft 13 is supported in the through hole 9, and the right end is in the bottomed hole 11. And is supported. The spindle 1
A pin hole 14 is formed at the right end of 3 and penetrates in the radial direction. While penetrating the boss portion 10 in the radial direction,
A pin 15 press-fitted into the pin hole 14 is provided, and the support shaft 13 is fixed to the casing 3 by the pin 15.

A gear 18 is rotatably supported around the shaft center 8 via a bearing 17 at an intermediate portion of the support shaft 13 in the axial direction. One end face 1 which is the left end face in the axial direction of the gear 18
9 and a first washer 23 is provided in a gap 21 between the opposing surface 20 of the casing 3 facing the one end surface 19.
The first washer 23 is fitted around the support shaft 13 and supported by the support shaft 13. A second washer 26 is provided between the other end surface 24 of the gear 18, which is the right end surface in the axial direction, and the opposing surface 25 of the casing 3 facing the other end surface 24.
The second washer 26 is externally fitted to the support shaft 13 and is supported by the support shaft 13.

The first washer 23 is substantially rectangular, and a part of the first washer 23 is
A part of is stopped against rotation. In addition, a part of the outer peripheral edge of the second washer 26 is extended radially outward, and the extended part 27 comes into contact with a part of the boss 10 around the shaft center 8 to prevent the rotation. It has been done. When the gear 18 rotates around the axis 8, one end face 19 of the gear 18 is on the first washer 23 and the other end face 24 is on the second washer 2.
6 and 6 respectively.

A drive gear 29 and a driven gear 30, which are other gears, mesh with the gear 18, respectively. The drive gear 29 and the driven gear 30 are accommodated in the casing 3, respectively. Each is rotatably supported around an axis.

When the vehicle is operated so as to be driven by two wheels, the power of the engine is supplied to each of the gears 18, 29, 3.
0, and can be transmitted only to the front wheels,
A wheel drive state is obtained. On the other hand, when operated to drive four wheels, the engine is connected to the rear wheels via the gears 18, 29, 30 so that power can be transmitted, that is, a four-wheel drive state is obtained. Has become.

In all the figures, an elastic body 32 is
The elastic body 32 is provided on one end face 1 of the gear 18.
9 and the opposing surface 25 of the casing 3 are elastically pressed in opposite directions in the axial direction of the gear 18.

As a result, a frictional force is generated between the fixed-side member 2 and the gear 18, and the frictional force restricts the gear 18 from freely rotating with respect to the fixed-side member 2. Is prevented from rattling easily with respect to the fixed side member 2.

Then, by this, the gear 18 and
The generation of meshing noise between the driving gear 29 and the driven gear 30, which are other gears meshing with this, is suppressed.

The elastic body 32 is made of one metal leaf spring 3.
3 is formed by bending substantially U-shaped. Notches 34 are formed at both free edges 33a, 33a of the leaf spring 33 bent substantially in a U-shape as described above. Then, when the elastic body 32 is fitted into the gap 21, the notch 34 is fitted with a halfway portion of the support shaft 13 in the axial direction.

In FIG. 1, the casing 3
A procedure for assembling the support shaft 13, the gear 18, and the elastic body 32 will be described.

First, as shown by a virtual line in FIG.
The first washer 23 is brought into close contact with one end face 19 of the gear 18 with grease, and the second washer 26 is brought into close contact with the other end face 24 of the gear 18. Further, a bearing 17 is mounted in the gear 18, and the gear 18, the first washer 23, the second washer 26, and the like are integrated, and as shown by a solid line in FIG. Is moved on the axis 8 (arrow A in the figure).

Next, as shown by the imaginary line in the figure, the support shaft 13 is moved from the outside on the left side of the casing 3 to the through hole 9, the inside of the gear 18, and the bottomed bottom as shown by the solid line in the figure. Hole 1
1 (see arrow B in the figure). And pin hole 1
A pin 15 is fitted into the casing 4 (arrow C in the figure), and the support shaft 13 is fixed to the casing 3.

Next, the elastic body 32 is fitted into the gap 21 from outside in the radial direction of the gear 18 as shown by a virtual line in the figure, as shown by a solid line in the figure (arrow D in the figure). ).

The leaf spring 33 of the elastic body 32
In the free state, the free edges 33a, 33a of the leaf spring 33 are largely open as shown by phantom lines in the figure.
a, 33a. Then, in order to make this fitting smooth, the two free edges 33a, 33a are pressed by an operator against the elastic force so as to approach each other (arrow E in the figure).

According to the above configuration, the elastic body 32 can be assembled after the support shaft 13 and the gear 18 have been assembled to the fixed member 2, that is, the elastic body 32 can be assembled. Since the elastic body 32 can be attached without being related to the attachment of the support shaft 13 and the gear 18, so-called retrofitting can be performed.

When assembling the elastic body 32,
When fitting the elastic body 32 into the gap 21, the notch 34 of the elastic body 32 is fitted to the support shaft 13.
Thereby, the positioning of the elastic body 32 in the gap 21 can be automatically performed.

The above-mentioned elastic body 32 is
Of the gear 3 is in contact with a part of the casing 3 around the axis 8 to prevent rotation, and the elastic body 32 presses the one end face 19 of the gear 18 via the first washer 23. .

The first washer 23 need not be provided.
In this case, the elastic body 32 directly slidably presses the one end face 19 of the gear 18.

[0042]

According to the present invention, an elastic body is provided in the gap between one end face of the gear facing each other and the opposing face of the casing which is a fixed side member, and this elastic body is in contact with the one end face. The opposing surfaces are elastically pressed in opposite directions in the axial direction of the gear.

Therefore, the gear is restricted from freely rotating with respect to the fixed side member by the frictional force between the fixed side member and the gear due to the pressing of the elastic body, and the same gear is fixed to the fixed side member. Is easily controlled.

Thus, the generation of meshing noise between the gear and another gear meshing with the gear is suppressed.

In the above structure, the elastic member is
A notch was formed, and the elastic body could be fitted into the gap from the radial outside of the gear , and this fitting was performed.
When the notch fits in the middle part of the support shaft in the axial direction
It is like that .

Therefore, the elastic body can be assembled after the gears have been assembled to the fixed member.
In other words, the assembly of the elastic body is not related to the assembly of the gear, because it can, assembly of the elastic body, so-called retrofit is possible.

[0047] Thus, the assembly of the elastic body becomes easy.

Moreover, as described above, the elasticity
The body can be inserted, and when this
Make sure that the notch fits in the axial halfway of the spindle.
It is.

Therefore, when assembling the elastic body,
The elastic body can be automatically positioned in the gap.
And

[Brief description of the drawings]

FIG. 1 is a plan sectional view of a power transmission mechanism.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a perspective view of an elastic body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power transmission mechanism 2 Fixed side member 3 Casing 8 Shaft center 13 Support shaft (fixed side member) 18 Gear 19 One end surface 20 Opposing surface 21 Gap 32 Elastic body 33 Leaf spring 33a Free edge 34 Notch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16H 55/00-55/30 F16H 1/06

Claims (1)

(57) [Claims] A gear is rotatably supported on a support shaft supported by a casing around its axis, and one end face in the axial direction of the gear and a fixed part of the casing or the like facing the one end face. An elastic body is interposed in the gap between the facing surface of the fixed member and the elastic body, and this elastic body elastically presses one end surface of the gear and the facing surface of the fixed member in opposite directions in the axial direction. In the meshing noise prevention device for a gear type power transmission mechanism, a cutout is formed in the elastic body so that the elastic body can be fitted into the gap from a radial outside of the gear , and
When the notch is inserted, the notch is
A gear noise prevention device for a gear type power transmission mechanism adapted to be fitted to an intermediate portion .