JP2000257698A - Gear device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear device capable of preventing generation of tooth hitting sound generated caused by meshing of gears and capable of restraining the rotational fluctuation of the gears. SOLUTION: In this gear device, a main gear part 3 and a sub gear part 5 are to be brought into contact with each other by a plate spring 7 and rotationally arranged on the same rotational axis, and both gear parts 3, 5 having the different number of teeth are meshed with the same counterpart drive gear with the rotational speed difference. Both gear parts 3, 5 are connected to each other in the rotational direction through a ring spring 11 for regulating the phase deviation between them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear device provided with a gear hitting prevention mechanism and a damper mechanism.

[0002]

2. Description of the Related Art As a conventional gear device with a gear rattle prevention mechanism, for example, a gear device shown in FIG. 3 is described on page 216 of the Automotive Technology Handbook, Design Edition (issued on March 1, 1991 by the Automotive Technology Association). I have.

As shown in FIGS. 3 (a) and 3 (b), the gear device 101 includes a friction gear 107 which reduces a rattling noise caused by a backlash between a drive gear 103 having a rotational fluctuation and a driven gear 105 meshing with the drive gear 103. The driven gear 105 and the number of teeth are 1
Different friction gears 107 are pressed against driven gear 105 by disc springs 109. Thus,
Both gears 105 and 107 are engaged with the drive gear 103 and are driven to rotate in the B direction.

At this time, due to the difference between the rotational speeds of the driven gear 105 and the friction gear 107, both gears 105,
Since a frictional force is generated on the contact surface of the driving gear 107, the backlash between the drive gear 103 and the driven gear 105 is canceled by the engagement between the drive gear 103 and the friction gear 107, thereby preventing the generation of a rattling sound.

[0005]

However, in the configuration using such a disc spring, when the rotation fluctuation of the drive gear 103 is large, the pressing force (frictional force) of the disc spring 109 needs to be increased, and the frictional force caused by the friction is increased. Problems such as wear and reduction in power transmission efficiency occur, and damping performance for suppressing rotation fluctuation cannot be expected.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a gear device that can prevent rattling noise caused by meshing of gears and suppress fluctuations in gear rotation.

[0007]

According to a first aspect of the present invention, a pair of gear portions rotatably disposed on the same rotation shaft while being in contact with each other by an urging member. In a gear device in which the pair of gears mesh with the same counterpart gear with a rotational speed difference therebetween, the two gears are rotated via a flexible connecting means for restricting a phase shift between the gears. It is characterized by being connected in a direction.

Therefore, when meshing with the mating gear,
Due to the difference in rotational speed between the pair of gear portions, a frictional force is generated at the contact portion between the two gear portions, and the backlash between one of the pair of gear portions and the other gear portion is caused by the frictional force. The gear is canceled by the meshing of the gear with the counterpart gear, so that the rattling noise is prevented.

At the same time, since the flexible connecting means between the pair of gear portions regulates the phase shift between the two gear portions, even if the rotational variation of the meshing gear is large, the rotational variation is suppressed by the action of restricting the phase shift. Can be suppressed.

[0010] The invention according to claim 2 is the gear device according to claim 1, wherein the biasing member is a disc spring.

Therefore, the same operation and effect as those of the first aspect can be obtained, and the gear device can be made compact by using the disc spring.

According to a third aspect of the present invention, in the gear device according to the first or second aspect, the flexible connecting means is a ring-shaped spring member having an abutment portion. .

Therefore, the same operation and effect as those of the first or second aspect of the invention can be obtained, and the connection structure in the rotation direction between the two gear portions can be simplified by using the ring-shaped spring member.

According to a fourth aspect of the present invention, in the gear device according to any one of the first to third aspects, the flexible connecting means is included in the pair of gear portions. I do.

Therefore, the same operation and effect as those of any one of the first to third aspects of the present invention can be obtained, and furthermore, the inner package does not contact the adjacent other members, and the reliability of the connecting means is improved.

[0016]

1 and 2 show an embodiment of the present invention.
This will be described below. FIG. 1 is a cross-sectional view of the gear device 1 of the present embodiment, and FIG. 2 is a view taken along the line AA of FIG.

As shown in FIGS. 1 and 2, the gear device 1 has a main gear portion 3 and a sub gear portion 5 as a pair of gear portions. The sub gear 5 is a boss 3 of the main gear 3.
a and is pressed against the side surface of the main gear portion 3 by a coiled disc spring 7 as an urging member and is in contact therewith. The contact surfaces 9 of the two gear portions 3 and 5 constitute a friction surface described later.

The number of teeth of the sub-gear portion 5 is increased by one after the dislocation gear-cutting than the number of teeth of the main gear portion 3, and both the gear portions 3 and 5 mesh with a drive gear (not shown). At this time, a rotation speed difference occurs between the two gear portions 3 and 5 due to the difference in the number of teeth, and friction occurs on the contact surface 9.

The main gear portion 3 is provided with a ring-shaped groove 3b opening to the contact surface 9, and a ring spring 11 as a flexible connecting means is accommodated in the groove 3b. Both ends 11a and 11b of the ring spring 11 abut against pins 13 and 15 which are press-fitted and fixed to the main gear portion 3 and the sub gear portion 5 and protrude into the groove 3b. FIG. 2 shows an attached state of the ring spring 11. At this time, both ends 11a, 1
A predetermined amount of abutment 17 is secured between 1b. Note that a predetermined clearance is secured in the radial direction between the ring spring 11 and the groove 3b, thereby allowing the ring spring 11 to be deformed in the radial direction.

When the gear device 1 is engaged with the drive gear, the main gear portion 3 is temporarily fixed so as not to rotate while being engaged with the drive gear, and only the sub gear portion 5 is driven in the rotational direction during operation. Is rotated by one tooth (shrinking the abutment 17 of the ring spring 11) to engage with the drive gear.

As a result, the sub gear portion 5 is
By 1, the urging force is constantly applied in the direction opposite to the rotation at the time of operation, and the rear tooth surface faces the front tooth surface of the meshing drive gear. On the other hand, the main gear portion 3 receives the urging force of the ring spring 11 in the rotating direction at the time of operation, and its front tooth surface is opposed to the rear tooth surface of the meshing drive gear.

Since the ring spring 11 directly shifts (spreads) the phase between the gear portions 3 and 5, the urging force is set to be small.

Next, the operation of the gear device 1 will be described.

The main gear portion 3 and the sub gear portion 5 of the gear device 1 are both meshed with the drive gear, and a difference in the rotational speed occurs due to the difference in the number of teeth of the two gear portions 3 and 5. At this time, the difference between the rotational speed difference between the two gear portions 3 and 5 and the backlash amount is due to the frictional force of the contact surface 9 of the two gear portions 3 and 5 and the ring spring 1.
1 is absorbed by the phase shift of the two gear portions 3 and 5 against the biasing force of the first gear portion 1 and the frictional force of the contact surface 9 and the resistance of the biasing force of the ring spring 11 cause the two gear portions 3 and 5 to resist. Is regulated.

Thus, the drive gear and the main gear 3
Is eliminated, and the rattling noise is prevented from being generated even if there is a rotation fluctuation on the drive gear side.

Further, since the urging force of the ring spring 11 resists the rotation fluctuation on the drive gear side, a damper action against the rotation fluctuation is obtained, and it is not necessary to set a large pressing force of the disc spring.

Thus, according to the present embodiment, the disc spring 7
By using the ring spring 11 and the gear device 1, the gear device 1 is compactly formed, the generation of rattling noise is prevented, and the ring spring 11 included in the two gear portions 3 and 5 enables the gear device 1 on the drive gear side. A damping action against rotation fluctuation is obtained.

Further, since the ring spring 11 is included in the two gear portions 3 and 5, there is no contact with other adjacent members, and the reliability is improved.

[0029]

As is apparent from the above description, according to the first aspect of the present invention, when meshing with the mating gear,
Due to the difference in rotational speed between the pair of gear portions, a frictional force is generated at the contact portion between the two gear portions, and the backlash between one of the pair of gear portions and the other gear portion is caused by the frictional force. The gear is canceled by the meshing of the gear with the mating gear, so that rattling noise is prevented.

At the same time, since the flexible connecting means between the pair of gear portions regulates the phase shift between the two gear portions, even if the rotational fluctuation of the meshing mating gear is large, the rotational fluctuation is suppressed by the action of restricting the phase shift. Can be suppressed.

According to the invention described in claim 2, according to claim 1
In addition to obtaining the same effects as those of the present invention, the gear device can be made compact by using a disc spring.

According to the invention described in claim 3, according to claim 1
Alternatively, the same effects as those of the second aspect can be obtained, and the connection configuration of the two gear portions in the rotational direction can be simplified by using the ring-shaped spring member.

According to the fourth aspect of the present invention, the first aspect is provided.
In addition to obtaining the same effect as any of the inventions of
Due to the inclusion, there is no contact with adjacent other members, and the reliability of the connecting means is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

3A is a sectional view of a conventional example, and FIG. 3B is an explanatory view of meshing.

[Explanation of symbols]

 Reference Signs List 3 Main gear part (gear part) 5 Sub gear part (gear part) 7 Belleville spring (biasing member) 9 Contact surface 11 Ring spring (flexible connecting means) 13, 15 Pin 17 Joint 17

Claims (4)

[Claims] 1. A pair of gear parts which are in contact with each other by an urging member and are rotatably arranged on the same rotating shaft, and said pair of gear parts have a rotational speed difference from the same counterpart gear. A gear device according to claim 1, wherein said two gear portions are connected in a rotational direction via flexible connecting means for restricting a phase shift between said two gear portions. 2. The gear device according to claim 1, wherein the biasing member is a disc spring. 3. The gear device according to claim 1, wherein said flexible connecting means is a ring-shaped spring member having an abutment portion. 4. The gear device according to claim 1, wherein said flexible connecting means is included in said pair of gear portions.