JPH0535230Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a scissor gear device.

PRIOR ART As shown in FIG. 4, a scissors gear device 1 is
A scissors gear 4 is attached to the shaft of the drive gear 2 and the meshing driven gear 3, and a ring-shaped spring with a joint is arranged on the opposing surfaces of the driven gear 3 and the scissors gear 4. One end of this spring is engaged with the driven gear and the other end with the scissors gear, and this spring applies a twisting force in the rotational direction. This scissors gear 4 functions to absorb the crush between the drive and driven gears 2, 3. Such a scissors gear device is described, for example, in Japanese Utility Model Application Laid-Open Publication No. 61-1770 and Japanese Utility Model Application Laid-Open Publication No. 2003-1211.
These are disclosed in Japanese Utility Model Application Publication No. 61-126145, Japanese Utility Model Application Publication No. 61-204058, and Japanese Patent Application Publication No. 60-237262.

This scissor gear device 1 is used, for example, in a camshaft mechanism of a vehicle, and a drive gear 2 is used as an intake camshaft, and a driven gear 3 is used as an intake camshaft.
Scissor gear 4 is fixed to the exhaust camshaft to suppress gear rattling noise even when torque fluctuates.

Problems to be Solved by the Present Invention As mentioned above, the scissor gear absorbs the backlash when the drive and the driven gear mesh, but this is because the spring creates a twist that is larger than the backlash between the scissor gear and the driven gear. This is possible by giving. However, with a ring-shaped spring having a butt joint, it is extremely difficult to obtain a predetermined torsion, and sometimes the shock absorption is insufficient.

Further, the work of locking the spring drive to the scissor gear is cumbersome and time-consuming, and sometimes the locking may come off.

Therefore, the present invention aims to solve the problems of the prior art described above.

Means for Solving the Problems A hole having two faces facing the driven gear is provided, the center line of the width across width of the hole is aligned with the center line of the gear, and a hole having two faces facing the scissor gear is provided, The center line of the width across flats of this hole and the center line of the gear are in a relationship where the torsion angle θ is larger than the backlash value, and means for fixing both gears to the shaft is provided through an elastic material inserted into the hole. , the present invention uses.

Function: By simply placing an elastic material on the shaft and inserting the elastic material into the holes of the scissor gear and driven gear, it is possible to easily obtain the required torsion angle θ between the two gears.

Examples Refer to Figures 1-3. A rectangular hole 8 having two opposing sides 6 and 7 is provided in the center of the driven gear 5. The center lines of the two sides 6 and 7 widths A coincide with the center line of the gear. A hole 12 having opposite widths 10 and 11 and having the same shape as the hole 8 is provided in the center of the scissor gear 9. The center line of the width A' of the two surfaces 10, 11 and the center line of the gear are in a relationship such that the deviation θ is larger than the backlash value.

An elastic member 15 having approximately the same external shape as the holes 8 and 12 is welded to the shaft 13 so as to come into contact with the flange portion 14 of the shaft 13. Holes 8 and 12 of both gears 5 and 9
Both gears 5 and 9 are fixed to the shaft 13 via the elastic member 15 by press-fitting the elastic member 15 into the shaft 13. Due to this fixation, the center line of the scissor gear 9 is twisted by θ with respect to the gear center line of the driven gear 5. The elastic member 15 is molded from synthetic rubber. Flange 16 of elastic member 15
prevents gears 5 and 9 from coming off from member 15.

When the driven gear 5 of the assembly shown in FIG. 2 is engaged with a drive gear (not shown), the scissor gear 9 is pushed back by the elasticity of the elastic member 15, eliminating backlash. That is, elastic force by the elastic member 15 is applied to the drive gear to eliminate rattling noise of the gear.

Effect: Since the elastic member and the gear hole are in contact with each other on two opposing sides, there is no slippage between them, allowing rotational torque to be transmitted accurately, and the two sides of the hole efficiently transmit torque to the elastic member. be able to.

Since only the elastic member is needed to attach the scissor gear to the shaft, the number of parts can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an example of the present invention, FIG. 2 is a perspective view showing an assembled state, FIG. 3 is a sectional view thereof, and FIG. 4 is an explanatory view showing a scissor gear. In the figure, 5...driven gear, 6, 7, 10, 1
1... 2nd surface, 8, 12... Hole, 9... Scissor gear, 13... Shaft, 15... Elastic member.

Claims (1)

[Scope of utility model registration request] In a device having a scissor gear that faces a driven gear meshing with a drive gear via an elastic material and is fixed to the shaft, the hole has a hole having two surfaces facing the driven gear and two surfaces facing the scissor gear. , the centerline of the width across flats of the gear of the driven gear and the centerline of the width across flats of the gear of the scissor gear have a relationship of torsion angle θ larger than the value of backlash, and the elasticity inserted into both holes is A scissor gear device in which both gears are fixed to a shaft through a material, and the elastic force of the elastic material eliminates bumps and noises of the gears.