JPH0620947U - Sub gear mounting structure - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to improve the assembly workability of a sub gear mounting structure for mounting a sub gear to a main gear by using a coil spring. A first positioning insertion hole is formed in the sub gear, a second positioning insertion hole larger than the first positioning insertion hole is formed in the main gear, and a second positioning insertion hole is formed from the first positioning insertion hole.
A spring member having a tapered portion that is pushed into the positioning insertion hole is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sub gear mounting structure for mounting a sub gear to a main gear using a coil spring.

[0002]

[Prior art]

 A backlash is usually formed between two gears that are engaged with each other. In other words, backlash is to prevent the back surface of the tooth from rubbing, so that the tooth thickness is smaller than the width of the groove and a small gap is formed between the teeth that engage with each other. It is a thing.

However, this backlash causes a rattling noise. In such a case, attach a subgear with the same number of teeth and the same tooth profile as that of the gear to the same gear coaxially, and bias this subgear in the direction of rotation with a torsion coil spring, etc. I try to get rid of. FIG. 6 shows a conventional subgear mounting structure.

In FIG. 6, reference numeral 1 denotes a main gear that meshes with a mating gear 2, and the main gear 1 is fixed to a rotary shaft 4 via a boss portion 3 that is integrally formed. Reference numeral 5 denotes a sub gear. The number of teeth of the sub gear 5 is the same as that of the main gear 1, and the tooth profile of at least one tooth surface is the same as that of the main gear 1. The sub gear 5 is rotatably fitted in the boss portion 3 of the main gear 1, and the outside thereof is positioned by a snap ring 6.

A coil spring 7 as shown in FIG. 7 is interposed between the sub gear 5 and the main gear 1, and the sub gear 5 is mounted so as to be rotatable relative to the main gear 1. When the sub gear 5 is assembled, the positioning pin 10 is inserted into the insertion holes 9 and 8 of the main gear 1 and the sub gear 5 so that the sub gear 5 is fixed to the main gear 1 in order to mesh with the mating gear 2. The positioning pin 10 was pulled out after meshing with the gear 2.

In this way, the main gear 1 and the sub gear 5 exert an elastic force in the rotating directions opposed to each other to prevent the generation of the jar sound.

[0007]

[Problems to be solved by the device]

 However, in such a conventional sub-gear mounting structure, in the case of transmission, the positioning pin has to be removed from the upper part of the cover, and the assembling workability is extremely poor. Further, in the case of transfer, since there is no cover and the opposing wall is a case, the positioning pin cannot be pulled out. Or, I had to punch a hole in the case, pull out the alignment pin, and then plug the hole.

The present invention has been made in view of the above conventional problems, and provides a sub-gear mounting structure with improved assembly workability by using a spring member having a tapered portion. It is an object.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a subgear mounting structure in which a subgear having the same gear profile as a main gear is rotatably mounted to a main gear fixed to a rotary shaft by a coil spring. A spring member having a first positioning insertion hole formed in the main gear, a second positioning insertion hole larger than the first positioning insertion hole formed in the main gear, and a tapered portion pushed into the second positioning insertion hole from the first positioning insertion hole. To prepare for.

[0010]

[Action]

 When the sub gear is assembled to the main gear, a spring member is inserted in the first and second positioning insertion holes so that the sub gear is positioned and fixed with respect to the main gear so as to mesh with the mating gear. Then, assembling into the case, the spring member is pushed into the first and second positioning insertion holes by the end surface of the case. At this time, when the pressing force reaches a predetermined value, the spring force of the spring member that opens outward causes the tapered portion to come out of the first positioning insertion hole and into the second positioning insertion hole.

As described above, since it is not necessary to pull out the spring member after assembling, it is not impossible to assemble as in the conventional case, and it is not necessary to remove the pin, so that the assembling workability is improved. You can

[0012]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are views showing an embodiment of the present invention. In FIG. 1, 11 is a rotating shaft, and the rotating shaft 11 is rotatably supported by a case 13 via a bearing 12.

A main gear 15 that meshes with a mating gear 14 is fixed to the rotary shaft 11 via a boss portion 16 that is integrally formed. Reference numeral 17 denotes a sub gear. The number of teeth of the sub gear 17 is the same as that of the main gear 15, and the tooth profile of at least one tooth surface is the same as that of the main gear 15.

The sub gear 17 meshes with the mating gear 14, is rotatably fitted in the boss portion 16, and is positioned by the snap ring 18. A coil spring 19 is interposed between the sub gear 17 and the main gear 15, and the sub gear 17 is attached to the main gear 15 so as to be relatively rotatable. That is, one end of the coil spring 19 is inserted into the insertion hole 20 formed in the sub gear 17, and the other end thereof is inserted into an insertion hole (not shown) that communicates with the groove 21 formed in the main gear 15. The coil spring 19 elastically biases the main gear 15 and the sub gear 17 in the rotational direction in which they face each other.

Reference numeral 22 is a first positioning insertion hole, and the first positioning insertion hole 22 is formed in the sub gear 17. Reference numeral 23 is a second positioning insertion hole communicating with the first positioning insertion hole 22, and the second positioning insertion hole 23 is formed in the main gear 15. The diameter of the second positioning insertion hole 23 is slightly larger than that of the first positioning insertion hole 22, for example, 0.2 to 0. It is formed 3 mm larger.

Reference numeral 24 is a spring member that is pushed into the second positioning insertion hole 23 from the first positioning insertion hole 22. The spring member 24 has a tapered portion 25 as shown in FIG. The spring member 24 expands in the direction indicated by arrow A. When the spring member 24 is pushed into the first positioning insertion hole 22, it springs out of the first positioning insertion hole 22 and enters the second positioning insertion hole 23 (see arrow B).

Next, the operation will be described. As shown in FIG. 3, when the sub gear 17 is assembled, the spring member 24 is inserted as a positioning member into the first positioning insertion hole 22 and the second positioning insertion hole 23 in order to mesh with the mating gear 14. 17 is fixed to the main gear 15 and meshed with the mating gear 14. 4 is a sectional view taken along the line CC of FIG.

Next, as shown in FIG. 5, assembling into the case 13, the spring member 24 is applied to the end surface of the case 13, and is pushed into the first positioning insertion hole 22. At this time, when the distance L between the case 13 and the sub gear 17 reaches a predetermined value, the taper portion 25 of the spring member 24 is disengaged from the first positioning insertion hole 22. In this way, the spring member 24 is pulled out of the first positioning insertion hole 22 by the spring force and enters the second positioning insertion hole 23 (see arrow B in FIG. 1).

When the sub gear 17 is attached to the main gear 15, since it is not necessary to pull out the spring member 24 after the attachment, it is not impossible to assemble as in the conventional case, and it is not necessary to pull out the pins. Workability can be improved.

[0020]

[Effect of device]

 As described above, the first positioning insertion hole and the second positioning insertion hole are formed in the sub gear and the main gear, the spring member having the tapered portion is inserted, and the positioning is performed. Since it is so arranged that it can be pulled out from the first positioning insertion hole and into the second positioning insertion hole, there is no possibility of assembly, and it is not necessary to pull out the pin, so that the assembling workability can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a perspective view of a spring member.

FIG. 3 is an explanatory diagram of an assembly process

FIG. 4 is a sectional view taken along line CC of FIG.

FIG. 5 is an explanatory diagram of another assembly process.

FIG. 6 is a diagram showing a conventional example.

FIG. 7 is a diagram showing a coil spring.

[Explanation of symbols]

 11: Rotating shaft 12: Bearing 13: Case 14: Counter gear 15: Main gear 16: Boss part 17: Sub gear 18: Snap ring 19: Coil spring 20: Insert hole 21: Groove 22: First positioning insert hole 23: Second positioning insertion hole 24: Spring member 25: Tapered portion

Claims (1)

[Scope of utility model registration request] 1. A subgear mounting structure for mounting a subgear having the same gear profile as a main gear by a coil spring so as to be rotatable relative to a main gear fixed to a rotary shaft, wherein a first positioning insertion hole is formed in the subgear. A second positioning insertion hole larger than the first positioning insertion hole is formed in the main gear, and a spring member having a tapered portion pushed into the second positioning insertion hole from the first positioning insertion hole is provided. Sub gear mounting structure.