JP2007146970A - Inner race fixing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inner race fixing device for simplifying the finish of the end face of a gear while avoiding the thrust of an inner race on the end face of the gear opposed to the inner race in the axial direction. <P>SOLUTION: The inner race fixing device comprises a shaft 1, a helical gear 2 formed on the outer peripheral face of the shaft 1, the inner race 3 fitted onto the outer peripheral face of the shaft 1 adjacent to the helical gear 2 along the axial direction of the shaft 1, first grooves 4a, 4b formed in the outer periphery of the shaft 1, second grooves 5a, 5b formed in the inner periphery of the inner race 3 in opposition to the first grooves 4a, 4b in the radial direction of the inner race 3, split washers 6a, 6b fitted to both of the first grooves 4a, 4b and the second grooves 5a, 5b to fix the inner race 3 to the shaft 1, and a spring 7 for energizing both the plurality of split washers 6a, 6b opposed to each other along the radial direction of the shaft 1 or the inner race 3 toward the inner race 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an inner race fixing device, and particularly to an inner race fixed to a shaft so as to face an outer peripheral gear in the axial direction.

In Patent Document 1, referring to FIGS. 2A and 2B, a shaft 21, an inner race 22 fitted on the outer peripheral surface of the shaft 21, and a gear 23 attached on the inner race 22 are disclosed. A divided thrust washer 24a, 24b divided into a plurality in the circumferential direction, a helical gear 25 formed on the outer periphery of the shaft 21 and opposed to the inner race 22 across the divided thrust washers 24a, 24b; A drop-off prevention ring member 26 that prevents the thrust washers 24a and 24b from falling off in the radial direction, and a restriction ring 27 that is fitted on the outer peripheral side of the divided thrust washers 24a and 24b and restricts displacement of the drop-off prevention ring member 26 in the axial direction. The thrust force from the inner race 22 is divided by the tooth surface 25a of the helical gear 25 through the divided thrust washers 24a and 24b. Holding structure of the split thrust washer is disclosed that only by.
JP-A-9-324809 (FIG. 6, paragraphs 0014 to 0021)

  However, according to the structure of Patent Document 1, since the thrust force from the gear or the like is received by the tooth surface 25a of the helical gear 25, a finishing process is required to increase the end surface accuracy of the tooth surface 25a. Moreover, according to the structure of the said patent document 1, since the thrust force from a gear etc. is received by the tooth surface 25a cut intermittently, it is necessary to raise the intensity | strength of the tooth surface 25a.

  An object of the present invention is to provide an inner race fixing device in which a thrust force from an inner race or the like is not applied to an end face of a gear arranged in an axial direction so as to face the inner race, and finishing of the end face of the gear can be simplified. It is.

  In the first aspect, the present invention is fitted to a shaft, a gear formed on the outer peripheral surface of the shaft, and adjacent to the gear along the axial direction of the shaft on the outer peripheral surface of the shaft. An inner race, a first groove formed in an outer peripheral portion of the shaft, a first groove formed in an inner peripheral portion of the inner race and a second groove facing the radial direction of the inner race, An inner race fixing device comprising: a washer that fits into both the first and second grooves and fixes the inner race to the shaft.

  According to the present invention, the inner race is configured by fitting a washer that also serves as a detent for the inner race into the groove formed in each of the shaft and the inner race and receiving a thrust load applied to the inner race by this washer. It is no longer necessary to receive the thrust load at the gear cutting end surface facing the side surface of the gear in the axial direction. This eliminates or simplifies the finishing process of the gear cutting end surface, and also prevents chipping of the gear cutting end surface.

  An inner race fixing device according to a preferred embodiment of the present invention includes a spring built in the shaft and biasing the washer fitted in both the first and second grooves toward the inner race. It is characterized by having. Thereby, the inner race is stably fixed to the shaft.

  In the inner race fixing device according to a preferred embodiment of the present invention, the thrust load receiving surface in the first groove contacting the washer is formed in a half moon shape, and the second groove is formed in an arc shape. It is characterized by that. As a result, the area of the thrust load receiving surface increases and the load applied to the receiving surface decreases.

  The inner race fixing device according to a preferred embodiment of the present invention is characterized in that the first groove receives a thrust load applied to the inner race via the washer and serves as a detent for the inner race. . Accordingly, the inner race can be fixed to the shaft with a small number of members.

  In the inner race fixing device according to a preferred embodiment of the present invention, the first grooves are formed to be spaced apart from each other along the circumferential direction of the shaft and are opposed to each other in the same radial direction. The second groove is formed of a plurality of second grooves formed apart from each other along the circumferential direction of the inner race and facing each other in the same radial direction, and the washer includes a plurality of divided washers. The split washer is fitted into the first and second grooves adjacent to each other among the plurality of first and second grooves.

  An inner race fixing device according to a preferred embodiment of the present invention includes a spring that biases the plurality of divided washers opposed to each other along the radial direction of the shaft or the inner race toward the inner race. Features.

  An embodiment of the present invention will be described with reference to the drawings. 1A and 1B are views for explaining an inner race fixing device according to an embodiment of the present invention. FIG. 1A is a cross-sectional view cut along an axial direction, and FIG. It is BB sectional drawing of (A).

  Referring to FIGS. 1A and 1B, an inner race fixing device according to an embodiment of the present invention includes a shaft 1, a helical gear 2 formed on the outer peripheral surface of the shaft 1, and a shaft 1. An inner race 3 fitted adjacent to the helical gear 2 along the axial direction of the shaft 1 on the outer peripheral surface, first grooves 4a and 4b formed on the outer peripheral portion of the shaft 1, and an inner race Of the first grooves 4a, 4b and the second grooves 5a, 5b, and the second grooves 5a, 5b, which are formed in the inner peripheral portion of the inner race 3, and are opposed to each other in the radial direction of the inner race 3. There are split washers 6a and 6b that are fitted to both and fix the inner race 3 to the shaft 1.

  The first grooves 4a and 4b are formed of a plurality of first grooves 4a and 4b that are formed apart from each other along the circumferential direction of the shaft 1 and are opposed to each other in the same radial direction. The second grooves 5a and 5b are formed of a plurality of second grooves 5a and 5b that are formed apart from each other along the circumferential direction of the inner race 3 and are opposed to each other in the same radial direction. Washers 6a and 6b are composed of a plurality of divided washers 6a and 6b. The divided washers 6a and 6b are fitted into the first and second grooves 4a, 5a, 4b, and 5b adjacent to each other among the plurality of first grooves 4a and 4b and the second grooves 5a and 5b, respectively. .

  The divided washers 6a and 6b and the thrust load receiving surfaces in the first grooves 4a and 4b that come into contact therewith are formed in a half-moon shape. The second grooves 5a and 5b are formed in an arc shape.

  Further, the inner race fixing device includes a spring 7 that biases a plurality of divided washers 6 a and 6 b facing each other along the radial direction of the shaft 1 to the inner race 3 toward the inner race 3.

  A first gear 8 is fitted on the inner race 3. The first gear 8 is engaged with a second gear (not shown) and receives a thrust load in the direction shown in FIG.

  A method of assembling the inner race fixing device described above will be described. 1A and 1B, the spring 7 is inserted through the second grooves 5a and 5b into the shaft 1 in which the helical gear 2 is formed, and the second grooves 5a and 5b are inserted. The divided washers 6a and 6b are fitted into the two. Next, the inner race 3 and the first gear 8 are fitted to the shaft 1 while lowering the divided washers 6a and 6b.

  The function of the inner race fixing device described above will be described. 1A and 1B, in the inner race fixing device according to the embodiment of the present invention, when a thrust load is applied to the inner race 3, the divided washers 6a and 6b are engaged. The inner wall surfaces (half moon surfaces) of the first grooves 4a and 4b are subjected to a thrust load applied to the inner race 3. That is, the half-moon shape of the shaft 1 is a thrust receiving surface. For this reason, it is not necessary to receive the thrust load on the gear cutting end surface of the helical gear 2 facing the side surface of the inner race 3 and the axial direction of the shaft 1. This eliminates or simplifies the finishing process of the gear cutting end surface, and also prevents chipping of the gear cutting end surface.

  The inner race fixing device according to the present invention is applied to a power transmission mechanism having an inner race that receives a thrust load, and in particular, a planetary gear type power transmission mechanism having a helical gear, such as a transfer, a differential mechanism, or a speed change mechanism. Applied to the machine.

(A) And (B) is a figure for demonstrating the inner race fixing device which concerns on one Example of this invention, (A) is sectional drawing cut | disconnected along the axial direction, (B) is (A) It is BB sectional drawing of). (A) And (B) is a figure for demonstrating the inner race fixing device which concerns on a prior art example, (A) is sectional drawing cut | disconnected along the axial direction, (B) is (A) axial direction. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft 2 Helical gear 3 Inner race 4a, 4b 1st groove | channel 5a, 5b 2nd groove | channel 6a, 6b Split washer 7 Spring 8 1st gear

Claims (6)

A shaft,
A gear formed on the outer peripheral surface of the shaft;
An inner race fitted on the outer peripheral surface of the shaft adjacent to the gear along the axial direction of the shaft;
A first groove formed on the outer periphery of the shaft;
A first groove formed on an inner periphery of the inner race and a second groove facing the inner race in the radial direction;
A washer that fits into both the first and second grooves to secure the inner race to the shaft;
An inner race fixing device characterized by comprising:   2. The inner race fixing device according to claim 1, further comprising a spring built in the shaft and biasing the washer fitted in both the first and second grooves toward the inner race. .   3. The inner race fixing according to claim 1, wherein a thrust load receiving surface in the first groove abutting on the washer is formed in a half-moon shape, and the second groove is formed in an arc shape. apparatus.   The inner race fixing device according to any one of claims 1 to 3, wherein the first groove receives a thrust load applied to the inner race via the washer and serves as a detent for the inner race. . The first groove is formed of a plurality of first grooves formed apart from each other along the circumferential direction of the shaft and facing each other in the same radial direction,
The second groove includes a plurality of second grooves that are formed apart from each other along the circumferential direction of the inner race and face each other in the same radial direction.
The washer includes a plurality of divided washers, and the divided washers are respectively fitted into the first and second grooves adjacent to each other among the plurality of first and second grooves. Item 5. The inner race fixing device according to any one of Items 1 to 4. 6. The inner race fixing device according to claim 5, further comprising a spring that biases the plurality of divided washers opposed to each other along the radial direction of the shaft or the inner race toward the inner race.

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