JPH0512821U - Gear device - Google Patents

Abstract

(57) [Abstract] [Purpose] Focusing on the fact that there are two types of meshing patterns for the intermediate gears, the driving gear and the driven gear, the backlash of the three gears is reduced to zero and the number of parts is reduced. What I did. [Structure] Both side surfaces 3A and 3B of an intermediate gear 3 which meshes with a drive gear 1 and at least one driven gear 2 respectively.
The drive sub gear 6 and the driven sub gear 7 which have the same number and the same number of teeth as the intermediate gear 2 and are coupled to one side of the abutting elastic bodies 5A and 5B are respectively rotated on the shaft 4 of A structure in which the other side of the elastic bodies 5A and 5B is coupled to the intermediate gear 3 while being provided as much as possible. [Effect] By using the split gear as the intermediate gear in the combination of at least three gears, the number of parts is small, the assembly is easy, and the backlash during meshing, which is a measure against noise, is removed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gear device used for power transmission, and more particularly to a gear device for an intermediate gear in which backlash is removed to reduce noise due to gear meshing.

[0002]

[Prior Art]

 Conventionally, in the case of power transmission by gears, the backlash of gears that mesh with each other has been removed to reduce the noise generated during meshing. Such a gear is generally called a scissors gear or a split gear. As a concrete structure, as shown in FIGS. 5 to 7, a driven gear 12 meshing with a driving gear 11 is divided into two in the width direction. Then, the gears 12A and 12B are formed and fitted on the same driven shaft 13, and the ring-shaped spring 12C for fitting the gear 12A and the gear 12B on the corresponding side surfaces is cut out at a part of the periphery thereof. Grooves 12a and 12b are respectively formed, pins 14 are implanted in the grooves 12a and 12b, and pin holes 15 and 16 into which the pins 14 are fitted are provided at both ends of the spring 12C. By mounting the pin 14 on the gear 12A side to 15 and the pin 14 on the gear B to the other pin hole 16, the driven gears 12A and 12B meshing with the rotation of the drive gear 11 are displaced as shown in FIG. The backlash is removed. In this way, the technique of dividing the driven gear into two gears and meshing with the same driving gear to remove the backlash is described in, for example, Japanese Utility Model Publication No. 58-169250, Japanese Utility Model Publication No. 60-10950, and Japanese Utility Model Publication No. 60-10950. It is disclosed in Japanese Patent Laid-Open No. 62-63456 and the like and is generally known.

[0003]

[Problems to be solved by the device]

 However, the above publication applies a driven gear that meshes with a driving gear as a set of split gears. For example, a driving gear (engine crank gear) 21 is used in a timing gear drive system as shown in FIG. It does not suggest the case where the intermediate gear (idler gear) 22 is meshed and the driven gears 23 and 24 such as the cam gear and the injection pump gear are meshed in parallel with the intermediate gear 22. Therefore, as shown in FIG. 8, in order to reduce the backlash to zero at points a, b1 and b2 which mesh with each other, the three gears, the driving gear 21 and the driven gears 23 and 24, are split into the above-mentioned split gears. Gears are the most effective, but this has the problem of increasing the number of parts and complicating assembly.

The present invention focuses on the fact that there are two types of meshing patterns with respect to the intermediate gear, namely, the driving gear and the driven gear, and it is possible to reduce the backlash of the three gears to zero and reduce the number of parts. The purpose of the present invention is to provide a spur gear device capable of solving the drawbacks of the prior art.

[0005]

[Means for Solving the Problems]

 As a means for solving the above-mentioned problems of the prior art, the present invention provides a drive gear and at least one driven gear on both side shafts of the intermediate gear, which have the same number and shape as the intermediate gear. A drive sub-gear and a driven sub-gear that have teeth and are connected to one side of the abutting elastic body are rotatably provided, respectively, and the other side of the elastic body is provided to the intermediate gear. It is characterized by being combined.

[0006]

[Action]

 According to the above configuration, the backlash between the drive gear and the intermediate gear and between the intermediate gear and the driven gear can be reduced to zero by the sub gears, respectively, so that the noise at the meshing of the three gears can be reduced. ..

[0007]

【Example】

 1 (a) and 1 (b) are sectional views through the center of the pin portion of an embodiment of the gear device according to the present invention, and FIG. 2 is a perspective view of the elastic body alone in FIG.

According to the present invention, the same number and the same number of teeth of the intermediate gear 3 are provided on the shafts 4 of both side surfaces 3A and 3B of the intermediate gear 3 which mesh with the driving gear 1 and at least one driven gear 2, respectively. A sub gear 6 for driving and a sub gear 7 for driving which are coupled to one side of the elastic bodies 5A, 5B having the shape shown in FIG. The other side of 5B is connected to the intermediate gear 3, respectively.

One side of the intermediate gear 3 meshes with the drive gear 1 and the other side meshes with the driven gear 2 at a position where it does not mesh with the drive gear 1. The side surface 6A of the sub gear 6 meshing with the drive gear 1 is provided on the shaft 4 on the side surface 3A side of the intermediate gear 3 so as to face it, and a part of the periphery is cut off on both side surfaces 3A and 7A. The ring-shaped recesses are provided at desired depths for accommodating the elastic bodies 5A such as the ring-shaped springs on both sides. One pin 8A is embedded in the recess on the side of the sub gear 6, and the pin 8A is inserted into a pin hole formed at one end of the elastic body 5A to be elastically connected to the sub gear 6. It is connected to the body 5A. Similarly, the other side surface 3B of the intermediate gear 3 is provided so as to face the side surface 7A of the sub gear 7 meshing with the driven gear 2, and both side surfaces 3B and 7A are partially cut off at their periphery. Ring-shaped recesses are provided at desired depths for accommodating the elastic bodies 5B such as ring-shaped springs on both sides. Then, one pin 8B is implanted in the recess on the side of the sub gear 7, and the pin 8B is fitted into a pin hole formed at one end of the elastic body 5B, whereby the sub gear 7 is formed. The elastic body 5B is engaged. One pin 9 penetrating in the width direction is provided so as to protrude in both recesses of the intermediate gear 3, and this pin 9 (which can be shared by one) has ends on the other side of the elastic bodies 5A and 5B. The elastic bodies 5A and 5B are joined to the intermediate gear 3 by being inserted into the pin holes formed in the. Therefore, since the intermediate gear 3 is coupled to the sub gears 6 and 7 via the elastic bodies 5A and 5B, respectively, and the intermediate gear 3 and the intermediate gear 3 are concentrically fitted to the rotary shaft 4, the rotary gears 4 are individually mounted on the rotary shaft 4. Although it is possible to rotate in a circular manner, in reality, the shaft 4 is reciprocally moved in the circumferential direction by a very small stroke due to the connection by the elastic bodies 5A and 5B. Is possible. In the figure, 10 is a snap ring for preventing the sub gears 6 and 7 from moving in the axis 4 direction.

Next, the operation will be described. In the meshing of the drive gear 1 and the intermediate gear 3, when the drive gear 1 rotates as shown in FIG. 3, the teeth of the intermediate gear 3 mesh with the teeth of the drive gear 1, but the teeth of the sub gear 6 shown by the dotted line The teeth are repelled by the elastic body 5A and act in a direction to reduce backlash to zero. Further, in the meshing of the intermediate gear 3 and the driven gear 2, the teeth of the intermediate gear 3 mesh with the teeth of the driven gear 2 as shown in FIG. 4, but this is the reverse of the case of FIG. The teeth of the sub gear 7 indicated by are repelled by the elastic body 5B and act in a direction to reduce the backlash to zero. Therefore, by providing the sub gears in both the drive gear 1 and the driven gear 2 that mesh with the intermediate gear 3, the backlash becomes zero. The backlash in FIGS. 3 and 4 shows the case where the sub gear is not used.

It should be noted that, as an application of the present invention, it is suitable when the idler gear is meshed with the crank gear of the engine, and the cam gear and the injection pump gear are meshed with the idler gear. Needless to say.

[0012]

[Effect of the device]

 As described above, the present invention has the same number and the same number of teeth as the intermediate gear on the shafts on both sides of the intermediate gear that meshes with the driving gear and at least one driven gear. Each of the driving sub-gear and the driven sub-gear that are coupled to one side of the elastic body is rotatably provided, and the other side of the elastic body is coupled to the intermediate gear. When the intermediate gear is a split gear in the gear combination, the number of parts is small, and the assembly is easy, and the backlash during meshing, which is a measure against noise, can be eliminated.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a cross section passing through the center of a pin portion of a gear device according to the present invention.

FIG. 2 is an explanatory view showing a perspective view of the elastic body alone of FIG.

FIG. 3 is an explanatory view showing a meshing state of a drive gear and an intermediate gear in the gear device of the present invention.

FIG. 4 is an explanatory view showing a meshing state of an intermediate gear and a driven gear in the gear device of the present invention.

FIG. 5 is an exploded view of a conventional split gear device.

6 is an explanatory view showing a meshed state of the gear device of FIG. 5. FIG.

FIG. 7 is an explanatory diagram showing a front cross-section of FIG.

FIG. 8 is an explanatory diagram showing an arrangement of a conventional timing gear drive system of an engine, which is a hint of the present invention.

[Explanation of symbols]

 1 Driving Gear 2 Driven Gear 3 Intermediate Gear 3A, 3B Both Sides 4 Shaft 5A, 5B Elastic Body 6,7 Sub Gear 8A, 8B Pin 9 Pin

Claims (1)

[Scope of utility model registration request] 1. An elastic body which has a tooth of the same shape and the same number as that of the intermediate gear on both side shafts of the intermediate gear which meshes with the driving gear and at least one driven gear. A gear device characterized in that a driving sub gear and a driven sub gear coupled to one side are rotatably provided, and the other side of the elastic body is coupled to the intermediate gear.