JP2010286007A - Transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission having a bearing fixing structure, shortening the whole length of the transmission. <P>SOLUTION: This transmission has: a rotary shaft 1; a bearing 2 including a bearing inner peripheral part 21 positioned on the outer peripheral side of one end of the rotary shaft 1 and an outer peripheral part 22 having a body fitting groove 221 formed in the outer peripheral surface in the circumferential direction and provided on the outer peripheral side of the bearing inner peripheral part 21 to relatively turn and to be regulated in the axial movement thereof; a snap ring 3 including a nearly C-shaped body part 31 possible to be fitted in the body part insertion-fitting groove 221 by inserting, and one or more lock claws 32 projecting outward in the radial direction from the body part 31 in one part of the body part 31 in the circumferential direction; and a case 4 provided with an insertion part 42, which is scraped in one part thereof in the circumferential direction so that the lock claw 31 moves in the axial direction, and a lock claw insertion-fitting groove 43, into which the lock claw 31 is fitted by inserting in the circumferential direction from the insertion part 42 by circumferential rotation of the snap ring 3 in the opposite position of the body insertion-fitting groove 221, in the inner peripheral surface thereof to hold the bearing 2, and preventing radial movement thereof. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a transmission, and more particularly to a transmission characterized by a structure for fixing a bearing.

  2. Description of the Related Art In recent years, automobile transmissions are required to be shortened in overall length as the vehicle becomes more compact. In addition, due to the multi-stage for the purpose of reducing fuel consumption, there is a demand for a structure that prevents the total length from being increased or shortened by another part or device by increasing the shift speed. .

  Incidentally, FIG. 12 is a partial cross-sectional view showing a state in which a bearing for rotatably supporting a rotary shaft on a transmission case is fixed in a conventional transmission that is generally used. In FIG. 12, the hatching indicating the cross section is omitted. FIG. 12 is a partial cross-sectional view of a commercially available lateral transmission for an FF vehicle (Non-patent Document 1). A deep groove ball bearing 92 is used on one end side (left side of the drawing) of the rotating shaft 91. . The bearing 92 has an important role of not only rotating the shaft while receiving a load generated by the gear, but also having a function of positioning the shaft itself in the axial direction. Therefore, as shown in FIG. 13, a snap ring 93 is used on the outer periphery of the bearing. After the snap ring 93 is assembled, the opening used for the assembly is closed with a lid 94, and the lid 94 is covered with five bolts. It is fixed at 95.

Nissan Motor Co., Ltd., RS5F70A manual

  However, this structure requires "the thickness of the lid 94 + the head height of the bolt 95" on one end side of the bearing, and the entire length of the transmission is extended in the same direction as the extension direction due to the multi-stage of the gear stage. Yes.

  The present invention has been made in view of the above problems, and an object to be solved is to provide a transmission having a bearing fixing structure capable of shortening the overall length of the transmission.

The constitutional feature of the invention according to claim 1 for solving the above-described problems includes a rotating shaft,
A bearing inner peripheral portion located on the outer peripheral side of one end portion of the rotating shaft, and a main body portion insertion groove formed in the circumferential direction on the outer peripheral surface, and relatively rotatable on the outer peripheral side of the bearing inner peripheral portion and in the axial direction A bearing provided with a bearing outer periphery provided so as to restrict movement of the bearing,
A main body portion that is substantially C-shaped with a thickness that can be inserted into the main body portion insertion groove without any gap in the axial direction, and one or more members that protrude in the outer diameter direction from the main body portion in a part of the circumferential direction of the main body portion. A snap ring with a pawl;
An insertion portion in which a part of the circumferential direction is cut so that the locking claw of the snap ring can move in the axial direction, and a rotation of the snap ring in the circumferential direction at a position facing the body portion insertion groove of the bearing A locking claw insertion groove into which the locking claw can be inserted in the circumferential direction from the insertion portion is formed on the inner peripheral surface, and the bearing is held in a radially immovable manner, the rotating shaft, the bearing, and A case for partitioning a space for storing the snap ring;
It is to have.

Further, the structural features of the invention according to claim 2 for solving the above-described problems are a rotating shaft,
A snap ring having a substantially C-shaped main body portion and one or more locking claws protruding in the inner diameter direction from the main body portion at a part in the circumferential direction of the main body portion;
The inner peripheral portion of the bearing positioned on the outer peripheral side of one end portion of the rotating shaft, the insertion portion and the outer peripheral surface of the snap ring that are partly cut in the circumferential direction so that the locking claw of the snap ring can move in the axial direction. Rotating in the circumferential direction of the ring has a locking claw insertion groove into which the locking claw can be inserted in the circumferential direction, can be relatively rotated on the outer peripheral side of the inner peripheral portion of the bearing, and is restricted from moving in the axial direction. A bearing provided with a bearing outer peripheral portion provided around,
A main body part insertion groove into which the main body part of the snap ring can be inserted at a position facing the engaging claw insertion groove of the bearing; and the bearing is held in a radially immovable manner, the rotating shaft, A case defining a space for housing the bearing and the snap ring;
It is to have.

  A structural feature of the invention according to claim 3 is that, in claim 1 or 2, the locking claws are formed at equal intervals in the circumferential direction.

  Further, the structural feature of the invention according to claim 4 is the structure according to any one of claims 1 to 3, wherein the one end is inserted into the main body part insertion groove and the locking claw insertion groove. The clip further includes a clip that restricts rotation of the snap ring in the circumferential direction, the lock claw being inserted into the lock claw insertion groove.

  In the invention which concerns on Claim 1, the snap ring located between a bearing and a case has the latching claw which protruded in the outer-diameter direction from the substantially C-shaped main-body part. The bearing is formed with a body portion insertion groove into which the snap ring body portion can be inserted in the circumferential direction on the outer peripheral surface, and the case is an insertion portion in which the snap ring locking pawl is movable in the axial direction on the inner peripheral surface. And a locking claw insertion groove into which the locking claw can be inserted in the circumferential direction from the insertion portion. With such a configuration, when the snap ring is inserted into the case in the axial direction and rotated in the circumferential direction at a position where the locking claw coincides with the insertion portion of the case in the circumferential direction, the locking claw is locked. Since it is inserted into the nail insertion groove, movement of the snap ring in the axial direction is restricted. And since the main-body part of a snap ring is inserted by the main-body-part insertion groove | channel of a bearing, the axial movement of the bearing holding the rotating shaft is also restricted. As a result, movement of the rotating shaft in the axial direction is restricted, and positioning of the rotating shaft in the axial direction is performed. In the transmission according to the present invention, the locking claw that protrudes to the outer diameter side from the main body portion of the snap ring is rotated in the circumferential direction and is inserted into the locking claw insertion groove of the case, thereby positioning the rotating shaft. Can be done. Therefore, in order to assemble the snap ring, the side where the bearing of the case is located is opened, the opening is closed with a lid, and there is no need for a bolt or the like for fixing the lid and the lid. Become.

  In the invention which concerns on Claim 2, the snap ring located between a bearing and a case has a latching claw which protruded from the substantially C-shaped main-body part to the internal-diameter direction. The case has an inner peripheral surface with a body portion insertion groove into which the main portion of the snap ring can be inserted in the circumferential direction, and the bearing has an insertion portion on the outer peripheral surface of which the locking claw of the snap ring can move in the axial direction. And a locking claw insertion groove into which the locking claw can be inserted in the circumferential direction from the insertion portion. By adopting such a configuration, with the main body portion inserted in the main body portion insertion groove of the case, the bearing is axially attached to the case at a position where the insertion portion of the bearing coincides with the locking claw in the circumferential direction. When the bearing is inserted and rotated in the circumferential direction, the locking claw is inserted into the locking claw insertion groove, so that the bearing holding the rotating shaft is restricted from moving in the axial direction. As a result, movement of the rotating shaft in the axial direction is restricted, and positioning of the rotating shaft in the axial direction is performed. In the transmission of the present invention, the rotation shaft is positioned by rotating the bearing so that the locking claw protruding to the inner diameter side from the main body portion of the snap ring is inserted in the locking claw insertion groove in the circumferential direction. Yes. Therefore, in order to assemble the snap ring, the side where the bearing of the case is located is opened, the opening is closed with a lid, and there is no need for a bolt or the like for fixing the lid and the lid. Become.

  In the invention according to claim 3, by forming the locking claws at equal intervals in the circumferential direction, the locking claws and the insertion portions into which the locking claws are inserted in the axial direction can be formed easily.

  In the invention which concerns on Claim 4, after a latching claw is inserted in a latching claw insertion insertion groove after inserting from an insertion part, a clip is inserted from an insertion part, a main-body part insertion insertion groove and a locking claw insertion insertion groove Since the rotation of the snap ring in the circumferential direction is surely restricted by fixing to the snap ring, the snap ring can be prevented from rotating.

(A) is explanatory drawing which represented the principal part of the transmission of Embodiment 1 in the partial cross section, (b) is B-B 'sectional drawing of Fig.1 (a). It is a front view which shows the snap ring 3 used with the transmission of Embodiment 1. FIG. (A) is explanatory drawing which represented the state which the snap ring 3 rotated and the latching claw 32 was inserted in the latching claw insertion groove | channel 42 by a partial cross section, (b) is FIG. 3 (a). It is BB 'sectional drawing. It is a partial cross section figure which shows the principal part of the transmission of the modification 1. It is a front view which shows the snap ring 3 used with the transmission of Embodiment 2. FIG. 6 is a partial cross-sectional view illustrating main parts of a transmission according to a second embodiment. It is explanatory drawing which shows the state which the snap ring 5 rotates and the latching claw 52 is inserted in the latching claw insertion insertion groove 24. FIG. It is a front view which shows the snap ring 3 used with the transmission of the deformation | transformation form 2. FIG. It is a partial cross section figure which shows the principal part of the transmission of the modification 2. It is explanatory drawing which shows the state which the snap ring 6 rotates and the latching claw 62 is inserted in the latching claw insertion insertion groove 222. FIG. (A) is explanatory drawing which represented the principal part of the transmission of Embodiment 3 in partial cross section, (b) is B-B 'sectional drawing of Fig.11 (a). is there. It is a partial cross section figure of the transmission of a prior art. It is a partial perspective view of the case used with the transmission of a prior art.

  The snap ring has one or more locking claws, preferably two or more, and is preferably formed at equal intervals in the circumferential direction or symmetrical with respect to the central axis. For example, when there are two locking claws, the interval between the two locking claws is 180 ° C., when there are three locking claws, the interval is 120 ° C., and when there are four locking claws, the two locking claws are spaced at 60 ° C. The pawls are also spaced at 60 ° C., and the two pairs of locking claws can be spaced at 120 ° C. When the number of the locking claws is two or more, the diameter of the tip of the locking claw (the outer diameter when protruding to the outer diameter side and the inner diameter when protruding to the inner diameter side) is preferably substantially the same diameter. Further, when two or more locking claws are formed, the circumferential width of each locking claw can be different for each nail or the same length for all the claws.

  The insertion part into which the locking claw is inserted in the axial direction has the same circumferential length in the circumferential direction and the same length in the circumferential direction when the circumferential length of each locking claw is the same in the circumferential direction. To form. That is, it is formed so that the phase is matched regardless of which claw is located at which insertion portion. When the locking claw is point-symmetric with respect to the central axis or the circumferential length is unequal and the circumferential length is different, the snap claw of the snap ring can be inserted in at least one place in the circumferential direction (the phases match) Formed).

  The main body portion insertion groove is formed in a C-shape that can be inserted over the entire circumference or the main body portion. The locking claw insertion groove can be the entire circumference or a part in the circumferential direction. In the case of forming a part in the circumferential direction, it is possible to intermittently form the circumferential width so that the whole or a part of the locking claw inserted from the insertion portion in the circumferential direction can be inserted.

  The insertion portion of the bearing in the case where the locking claw protrudes toward the inner diameter side can have the outer peripheral portion of the bearing tangent to the shape along the outer shape of the locking claw or the diameter of the tip of the locking claw.

(Assembly method)
When the locking claw protrudes to the outer diameter side, the snap rig is held by the bearing. The main body part of the snap ring is inserted into the main body part insertion groove of the bearing. Next, the locking claw of the snap ring is in phase with the insertion portion of the case, and the bearing is inserted into the case in the axial direction. The snap ring or the snap ring and the bearing are rotated. If the main body insertion groove is approximately the same as the main body in the circumferential direction, the snap ring and the bearing are rotated together. By rotating the snap ring, the locking claw of the snap ring is inserted into the locking claw insertion groove of the case. As a result, the locking claw is caught in the case in the axial direction, and the movement of the snap ring in the axial direction is restricted. As a result, the rotation of the bearing and the rotating shaft held by the bearing is restricted in the axial direction, and the rotating shaft can be positioned.

  When the locking claw protrudes toward the inner diameter side, the snap ring is held in the case. The main body part of the snap ring is inserted into the main body part insertion groove of the case. The body portion insertion groove is formed in a C shape over the entire circumference as a shape into which the body portion is inserted. Next, the phases of the locking claw of the snap ring and the insertion portion of the bearing are matched, and the bearing is inserted into the case in the axial direction. Then, the bearing is rotated. As the bearing rotates, the locking claw of the snap ring is inserted into the locking claw insertion groove of the bearing. Thus, the locking claw is caught by the bearing in the axial direction, the movement of the bearing in the axial direction is restricted, and the rotation shaft can be positioned.

(Embodiment 1)
As shown in FIG. 1, the transmission according to the first embodiment includes a rotating shaft 1, a bearing 2, a snap ring 3, and a case 4.

  The rotating shaft 1 is rotatably supported at one end side by a case 4 described later via a bearing 2. Although not shown in the drawings, a plurality of gears are supported coaxially so as to be rotatable or integrally rotatable on the rotary shaft 1 from one end side to the other end side.

  The bearing 2 is a member disposed on the outer peripheral side of the rotary shaft 1 and on the inner peripheral side of the case 4 so as to restrict the axial movement of the rotary shaft 1 on one end side of the rotary shaft 1. That is, it is a member located between one end side of the rotating shaft 1 and the case 4. The bearing 2 includes a bearing inner peripheral portion 21 that is fixed to the outer peripheral side of one end of the rotary shaft 1, a bearing outer peripheral portion 22 that is positioned on the outer peripheral side of the bearing inner peripheral portion 21 and is in contact with the case 4, and a bearing inner peripheral portion 21. And a rotatable ball 23 located between the bearing outer peripheral portions 22. And the bearing outer peripheral part 22 has the main-body part insertion groove | channel 221 formed in the circumferential direction on the outer peripheral surface. The main body insertion groove 221 is recessed in the inner diameter direction over the entire circumference in the circumferential direction, and the axial width is such that a snap ring 3 described later can be inserted.

  As shown in FIG. 2, the snap ring 3 includes a substantially C-shaped main body 31 and a circumferential direction of the main body 31 with a thickness that can be inserted into the main body insertion groove 221 of the bearing 2 without gaps in the axial direction. It has a locking claw 32 that protrudes from the main body 31 in the outer diameter direction. The outer peripheral diameter of the main body 31 is preferably smaller in the radial direction than the bearing outer peripheral portion 22 of the bearing 2 (located on the inner diameter side) in a state where the main body 31 is inserted into the main body insertion groove 221. The three locking claws 32 protrude in the circumferential direction at equal intervals, and all protrude substantially the same in the radial direction, and the circumferential width is also substantially the same. And the latching claw 32 protrudes to the outer diameter side from the bearing outer peripheral part 22 in the state in which the main body part 31 is inserted in the main body part insertion groove 221.

  Returning to FIG. 1, the case 4 is a case of a transmission having a storage space 40 in which members for speed change such as the rotating shaft 1, the bearing 2, the snap ring 3, and a plurality of gears are stored. The case 4 has a bearing fixing portion 41, an insertion portion 42, and a locking claw fitting insertion groove 43. The bearing fixing portions 41 and the insertion portions 42 are alternately formed in the circumferential direction. The bearing fixing portion 41 has an inner surface shape that covers the outer peripheral surface of the bearing outer peripheral portion 22 of the bearing 2. The insertion portions 42 are equal in number to the locking claws 32 and are equally spaced in the circumferential direction so that the locking claws 32 can move in the axial direction while the main body portion 31 of the snap ring 3 is inserted in the main body portion insertion grooves 221. Further, it is formed so as to be missing from the bearing fixing portion 41 in the outer diameter direction. The locking claw fitting insertion groove 43 is located at a position facing the main body fitting insertion groove 221 of the bearing outer peripheral portion 22 of the bearing 2 on the inner surface side of the bearing fixing portion 41, and the locking claw 32 is rotated in the circumferential direction from the insertion portion 42. It is formed between the insertion part 42 and the insertion part 42 in the circumferential direction so that it can be inserted.

  Next, a method of rotatably supporting the rotating shaft 1 on the case 4 (a method of fixing the bearing 2 to the case 4) in the transmission of the first embodiment will be described.

  First, one end of the rotating shaft 1 is fitted into the bearing inner peripheral portion 21 of the bearing 2, and the bearing 2 is fixed to the rotating shaft 1. Next, the main body portion 31 of the snap ring 3 is inserted into the main body portion insertion groove 221 of the bearing 2. The main body portion 31 is fitted in the main body portion insertion groove 22 so that the outer diameter does not protrude, and the locking claw 32 protrudes from the bearing outer peripheral portion 22. Next, in FIG. 1B, the rotating shaft 1 to which the bearing 2 is fixed is inserted from the right side to the left side of the case 4 with the bearing 2 on the left side. At this time, the locking claws 32 of the snap ring 3 and the insertion portions 42 of the case 4 are inserted in phase. The locking claw 32 inserts the rotary shaft 1, the bearing 2, and the snap ring 3 to a position where they are fixed to the case 4 without being blocked by the bearing fixing portion 41 of the case 4. Then, the bearing 2 and the snap ring 3 are rotated in the circumferential direction, for example, counterclockwise in FIG. 2 (arrow L direction), and the locking claw 32 is inserted into the locking claw insertion groove 43 of the case 4. As shown in FIG. 3, the locking claws 32 are inserted until the entire locking claws 32 are inserted into the locking claw insertion grooves 43 between the insertion portions 42. Here, the locking claw insertion groove 43 is formed between the insertion portion 42 and the insertion portion 42, but the locking claw 32 needs to be inserted into the locking claw insertion groove 43 in the entire circumferential direction. There may be a part of the insertion portion 42.

  According to the transmission of the first embodiment, the snap ring 3 can be inserted into the case 4 in the axial direction at a position where the locking claw 32 coincides with the insertion portion 42 of the case 4 in the circumferential direction, and is rotated in the circumferential direction. Since the locking claw 32 is inserted into the locking claw insertion groove 221, the axial movement of the snap ring 3 is restricted. And since the main-body part 31 of the snap ring 3 is inserted by the main-body-part insertion groove | channel 221 of the bearing 2, the axial movement of the bearing 2 holding the rotating shaft 1 is also controlled. As a result, movement of the rotating shaft 1 in the axial direction is restricted, and positioning of the rotating shaft 1 in the axial direction is performed. In the transmission of the present invention, the locking claw 32 protruding to the outer diameter side from the main body 31 of the snap ring 3 is rotated in the circumferential direction and is inserted into the locking claw insertion groove 43 of the case 4. Because the rotary shaft 1 can be positioned, the side of the case 4 where the bearing 2 is located is opened, the opening is closed with a lid, and bolts for fixing the lid and the lid are necessary to assemble the snap ring 3 Therefore, the axial direction can be shortened. That is, the length is shortened with respect to the extending direction due to the multi-stage shift stage.

(Modification 1)
The first modification basically has the same configuration and the same function and effect as the first embodiment. The following description will focus on the different parts.

  As shown in FIG. 4, the locking claw insertion groove 43 of the case 4 used in the transmission according to the first modified embodiment is circumferential between the insertion portion 42 adjacent from one side in the circumferential direction of the insertion portion 42. Formed in part. That is, the locking claw 32 (snap ring 3) cannot make one rotation in the circumferential direction. One latching claw insertion groove 43 can be configured such that a part of the latching claw 32 can be inserted from a length that allows the entire latching claw 32 to be inserted in the circumferential direction.

  According to the transmission of the first modification, when assembling, the snap ring 3 (even together with the bearing 2) after being inserted into the case 4 is easily understood to what extent it should be rotated. .

(Embodiment 2)
The second embodiment basically has the same configuration and the same function and effect as the first embodiment. The following description will focus on the different parts.

  As shown in FIG. 5, the snap ring 5 includes a substantially C-shaped main body 51 and three locking claws 52 protruding in the inner diameter direction from the main body 51 at a part of the circumferential direction of the main body 51. . The protrusions of the locking claws 52 protrude from the main body 51 in the circumferential direction to the same extent. That is, the distal end on the inner diameter side of the locking claw 52 is positioned in substantially the same radial direction.

  As shown in FIG. 6, the bearing 2 includes an inner peripheral portion 21, an outer peripheral portion 22, and an insertion portion 24 in which a portion in the circumferential direction is cut so that the locking claw 52 of the snap ring 5 can move in the axial direction. . The outer peripheral portion 22 has an engaging claw insertion groove 222 on the outer peripheral surface into which the engaging claw 52 can be inserted in the circumferential direction by the circumferential rotation of the snap ring 5. The same number of insertion portions 24 as the locking claws 52 are formed in the circumferential direction. The locking claw insertion claw 222 is formed between the insertion portions 24 so that the locking claw 52 can be inserted in the circumferential direction from the insertion portion 24.

  The case 4 has a storage space 40, a bearing fixing portion 41, and a main body portion insertion groove 44. The main body portion insertion groove 44 is recessed in the outer diameter direction along the entire circumference in the circumferential direction, and the width in the axial direction is such that the main body portion 51 of the snap ring 5 can be inserted.

  In the snap ring 5, the main body 51 does not protrude from the bearing fixing portion 41 in the inner diameter direction in a state where the main body 51 is inserted into the main body insertion groove 44, and the locking claw 52 does not protrude from the inner diameter of the bearing fixing portion 41. Projecting from

  Next, a method of rotatably supporting the rotating shaft 1 on the case 4 (a method of fixing the bearing 2 to the case 4) in the transmission of the second embodiment will be described.

  First, the main body 51 of the snap ring 5 is inserted into the main body insertion groove 44 of the case 4. Then, one end side of the rotating shaft 1 is fitted into the bearing inner peripheral portion 21 of the bearing 2, and the bearing 2 is fixed to the rotating shaft 1. Next, the bearing 2 holding the rotating shaft 1 is inserted into the bearing fixing portion 41 of the case 4. At this time, the locking claws 52 of the snap ring 5 and the insertion portion 24 of the bearing 2 are inserted in phase. The bearing 2 is inserted to a position where the outer peripheral portion 22 is fixed to the case 4 without being blocked by the locking claw 52. Then, the bearing 2 is rotated in the circumferential direction, and the locking claw 52 is inserted into the locking claw insertion groove 222 of the bearing 2. As shown in FIG. 7, the locking claw 52 is inserted into the locking claw insertion groove 222 between each insertion portion 24 until the entire locking claw 52 is inserted. Here, the locking claw insertion groove 222 is formed between the insertion portion 24 and the insertion portion 24, but the locking claw 52 needs to be inserted into the locking claw insertion groove 222 in the entire circumferential direction. However, a part of the insertion portion 24 may protrude.

  According to the transmission of the second embodiment, in a state where the main body 51 is inserted into the main body insertion groove 44 of the case 4, the insertion portion 24 of the bearing 2 coincides with the locking claw 52 in the circumferential direction. When the bearing 2 is inserted into the case 4 in the axial direction and the bearing 2 is rotated in the circumferential direction, the locking claw 51 is inserted into the locking claw insertion groove 222, so that the rotary shaft 1 is held. The bearing 2 is restricted from moving in the axial direction. As a result, movement of the rotating shaft 1 in the axial direction is restricted, and positioning of the rotating shaft 1 in the axial direction is performed. In the transmission according to the second embodiment, the bearing 2 is rotated so that the locking claw 52 protruding to the inner diameter side from the main body 51 of the snap ring 5 is inserted into the locking claw insertion groove 222 in the circumferential direction. Since the rotary shaft 1 can be positioned, the side of the case 4 where the bearing 2 is located is opened in order to assemble the snap ring 5, the opening is closed with a lid, and bolts for fixing the lid and lid are provided. Since this is not necessary, it is possible to shorten the axial direction, that is, the extension direction associated with the multi-stage shift stage.

(Modification 2)
The modified embodiment 2 has basically the same configuration and the same function and effect as the second embodiment. The following description will focus on the different parts.

  As shown in FIG. 8, the spring 6 used in the transmission of the second modification has a substantially C-shaped main body 61 and a part of the main body 61 in the circumferential direction, and has a larger width in the inner diameter direction than the main body 61. And a locking claw 62. The locking claw 62 has a linear inner end and corresponds to a tangent to the radial direction.

  As shown in FIGS. 9 and 10, the bearing portion 2 is inserted such that the inner peripheral portion 21, the outer peripheral portion 22, and the locking claws 62 of the snap ring 6 are axially movable so that a part in the circumferential direction is cut off. Part 25. The insertion portion 25 is lacking in a tangent to the bottom surface of the body portion insertion groove 222 of the outer peripheral portion 22, that is, in a straight line shape. FIG. 9 is a view in which the insertion portion 25 of the bearing 2 is inserted into the case 4 in phase with the locking claw 62 of the spring 6 in which the main body portion 61 is inserted into the main body portion insertion groove 44 of the case 4. FIG. 10 shows a state in which the bearing 2 is rotated and the locking claw 62 is inserted into the locking claw insertion groove 222.

  According to the transmission of the second modification, the locking claw 62 and the insertion portion 25 for inserting the locking claw 62 in the axial direction are tangent to the radial direction, that is, a straight line. Cheap.

(Embodiment 3)
The third embodiment basically has the same configuration and the same function and effect as the first embodiment. The following description will focus on the different parts.

  As shown in FIG. 11, the transmission according to the second embodiment includes a rotating shaft 1, a bearing 2, a snap ring 3, a case 4, and a clip 7.

  The clip 7 has a plate-like main body 71 and a rotation stopper 72 whose one end is bent like a key. The clip 7 is inserted so that the anti-rotation portion 72 is positioned in the locking claw fitting insertion groove 43 of the case 4 and the main body fitting insertion groove 221 of the bearing 2. In the third embodiment, the clip 7 in FIG. 11B is a state in which the bearing 2, the rotary shaft 1, and the snap ring 3 are inserted into the case 4, and the bearing 2 or the bearing 2 and the snap ring 3 are circumferentially moved. Then, the rotation stopper 72 is placed on the left side and inserted into the insertion portion 42. Then, as shown in FIG. 11 (b), the hook is inserted until the hook 721 at the distal end portion of the rotation stopper 72 is caught in the main body insertion groove 221 or the locking claw insertion groove 43. The length from the rotation stop portion 72 to the other end is such that the other end slightly protrudes from the insertion portion 42 in a state where the clip 7 is inserted into the insertion portion 42. Further, it is preferable that the circumferential length of the rotation stopper 72 is shorter than that of the insertion portion 42, and the main body 71 is gently curved along the circumferential shape of the insertion portion 42 as necessary.

  According to the transmission of the third embodiment, the clip 7 is inserted in the state in which the rotary shaft 1, the bearing 2, and the snap ring 3 are inserted into the case 4 and the rotary shaft 1 is positioned in the axial direction by the snap ring 3. Is inserted into the insertion portion 42, it is possible to reliably prevent rotation of the snap ring 3 inserted in phase with the insertion portion 42 in the circumferential direction.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, the number of locking claws is not limited to three, and may be one. And it is preferable to form two or more and arrange | position in the position which opposes. The shape of each nail does not need to be the same, but the same shape is preferable because it is easy to adjust the phase. Furthermore, when two or more claws are formed, it is preferable to form the claws uniformly in the circumferential direction because the phases can be easily matched.

  Further, the clip 7 can be used not only in the transmission of the first embodiment, but also in the second embodiment, the first modification, and the second modification. The shape of the clip 7 is not limited to the shape described above, and may be any shape that can be inserted into the insertion portion and can be fixed to the main body portion insertion groove and the locking claw insertion groove. Further, not only one clip 7 but also two or more insertion portions 42 can be used.

DESCRIPTION OF SYMBOLS 1 ... Rotating shaft 2 ... Bearing 21 ... Inner peripheral part 22 ... Outer peripheral part 23 ... Ball 24 ... Insertion part 221 ... Main body part insertion insertion groove 222 ... Locking claw insertion insertion groove 3, 5, 6 ... Snap ring 31,51, DESCRIPTION OF SYMBOLS 61 ... Main-body part 32, 52, 62 ... Locking claw 4 ... Case 40 ... Storage space 41 ... Bearing fixing part 42 ... Insertion part 43 ... Locking claw insertion insertion groove 44 ... Main-body part insertion insertion groove 7 ... Clip 71 ... Main body Part 72: Anti-rotation part 721 ... Hook part.

Claims (4)

A rotation axis;
A bearing inner peripheral portion located on the outer peripheral side of one end portion of the rotating shaft, and a main body portion insertion groove formed in the circumferential direction on the outer peripheral surface, and relatively rotatable on the outer peripheral side of the bearing inner peripheral portion and in the axial direction A bearing provided with a bearing outer periphery provided so as to restrict movement of the bearing,
A main body portion that is substantially C-shaped with a thickness that can be inserted into the main body portion insertion groove without any gap in the axial direction, and one or more members that protrude in the outer diameter direction from the main body portion in a part of the circumferential direction of the main body portion. A snap ring with a pawl;
An insertion portion in which a part of the circumferential direction is cut so that the locking claw of the snap ring can move in the axial direction, and a rotation of the snap ring in the circumferential direction at a position facing the body portion insertion groove of the bearing A locking claw insertion groove into which the locking claw can be inserted in the circumferential direction from the insertion portion is formed on the inner peripheral surface, and the bearing is held in a radially immovable manner, the rotating shaft, the bearing, and A case for partitioning a space for storing the snap ring;
A transmission comprising: A rotation axis;
A snap ring having a substantially C-shaped main body portion and one or more locking claws protruding in the inner diameter direction from the main body portion at a part in the circumferential direction of the main body portion;
The inner peripheral portion of the bearing positioned on the outer peripheral side of one end portion of the rotating shaft, the insertion portion and the outer peripheral surface of the snap ring that are partly cut in the circumferential direction so that the locking claw of the snap ring can move in the axial direction. Rotating in the circumferential direction of the ring has a locking claw insertion groove into which the locking claw can be inserted in the circumferential direction, can be relatively rotated on the outer peripheral side of the inner peripheral portion of the bearing, and is restricted from moving in the axial direction. A bearing provided with a bearing outer peripheral portion provided around,
A main body part insertion groove into which the main body part of the snap ring can be inserted at a position facing the engaging claw insertion groove of the bearing, and the bearing is held in a radially immovable manner, the rotating shaft, A case defining a space for housing the bearing and the snap ring;
A transmission comprising:   The transmission according to claim 1 or 2, wherein the locking claws are formed at equal intervals in the circumferential direction.   The circumferential direction of the snap ring inserted into the insertion portion, one end portion being fixed to the main body portion insertion groove and the locking claw insertion groove, and the locking claw being inserted into the locking claw insertion groove The transmission according to any one of claims 1 to 3, further comprising a clip for restricting the rotation of the transmission.

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