JP2015152140A - Stopper ring, transmission and process for manufacture of transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission capable of improving a degree of freedom in an engaging position of a stopper ring when rotating shafts arranged side by side are inserted into a case.SOLUTION: This invention relates to a transmission having two rotating shafts, bearing members and a case. Stationary portions 411a and 411b are fitted to both a stationary groove arranged at the bearing member at one end in the same direction of two rotating shafts and a stationary groove arranged at a case opposing to the former, respectively under their normal states to enable their relative motions to be restricted, operating segments 41a and 41b are operated through a series of actions to deform them in a diameter expanding direction and there is provided a stopper ring deformable to release the restriction of the relative motion simultaneously. A diameter of the stopper ring corresponding to each of the rotating shafts arranged substantially in parallel to each other can be expanded through a series of actions, thereby it is possible to improve a degree of freedom of a position where the engaging stationary grooves arranged at the rotating shafts and a case are formed.

Description

  The present invention relates to a retaining ring, a transmission, and a method for manufacturing the transmission.

  The retaining ring is fitted into the circumferential groove formed on the outer periphery of the rod-shaped member and the circumferential groove formed on the case to which the rod-shaped member is attached, thereby restricting the axial movement of the rod-shaped member to the case or the like. It is used to install in the state that was done. The retaining ring has a C-shape with a part of a substantially circular circumferential direction lacking as a general shape, and is used by being deformed so that the diameter is reduced or expanded. In other words, the retaining ring is fitted to the outer periphery of the rod-shaped member to reduce the diameter from the normal size, and in that state, the diameter is returned to a constant value at a predetermined place of the case. Alternatively, the diameter is expanded from the normal size by fitting it in a predetermined place of the case, and the diameter is returned to the steady state in a state where the rod-like member is arranged at the predetermined position.

  Incidentally, a plurality of rotating shafts are arranged in parallel in the transmission. A plurality of gears that can rotate integrally with the rotation shaft or rotate freely are arranged on each rotation shaft, and the rotation is transmitted from the rotation shaft to the rotation shaft by meshing between the gears disposed on different rotation shafts.

  Each rotating shaft is rotatably supported inside the case via a bearing member. A retaining ring is attached to the outer periphery of the bearing member 16 attached to the outer periphery of the input shaft 13, such as the input shaft 13 in the transmission illustrated in FIG. Thus, there is a configuration in which each rotating shaft is regulated so as not to move in the axial direction. The retaining ring is locked to both the groove provided around the rotating shaft and the groove provided in the corresponding part in the case, thereby restricting relative movement in the axial direction between the rotating shaft and the case. To do.

  When assembling such a transmission, insert the rotating shaft into the case with the retaining ring locked to one of the groove provided around the rotating shaft or the groove provided in the case. Go. When the rotating shaft is inserted into the case, the retaining ring interferes with the case or the rotating shaft in the middle, and there is a time when it becomes impossible to insert any more rotating shaft. After inserting the rotating shaft into the case until the retaining ring gets in the way during assembly, insert the rotating shaft into the case by expanding or reducing the diameter of the retaining ring from the steady state. . Whether the retaining ring is expanded or contracted is determined depending on whether the retaining ring is initially locked, either the case or the rotating shaft. If the retaining ring is locked in the groove provided on the inner surface of the case, the retaining ring is expanded and retracted inside the groove formed in the case, and is locked in the groove around the rotating shaft. In such a case, the retaining ring is reduced in diameter and retracted into a groove provided in the rotating shaft. Usually, a retaining ring is locked in a groove on the case side, which is the side on which the depth of the groove is easily increased.

  The retaining ring has a joint part that is partly divided, and by inserting a tool into the case from the opening provided in the case and operating the joint part, the retaining ring is deformed in the direction of diameter expansion or contraction. ing.

  Since there are a plurality of retaining rings for a transmission having a plurality of rotating shafts, the position at which the retaining ring is deformed in the direction of diameter expansion or contraction may be shifted. This is because if the position where the retaining ring is deformed is the same for a plurality of rotating shafts, it is necessary to deform the retaining ring at the same time, and the number of people required for manufacturing increases. Therefore, the timing for operating the retaining ring is shifted by shifting the position for retaining the retaining ring in the axial direction of the rotating shaft.

Japanese Patent Laid-Open No. 5-263898

  By the way, if the position where the retaining ring is locked is shifted in the axial direction, the position where the locking groove is provided on the outer periphery of the bearings of the rotary shafts arranged side by side also needs to be shifted in the axial direction of the rotary shaft. That is, the degree of freedom of the position of the locking groove is reduced.

  For example, when a ball bearing is used as the bearing of the rotating shaft, the distance from the outer peripheral surface of the outer ring to the ball rolling surface formed on the inner surface of the outer ring varies depending on the position of the ball bearing in the axial direction. For this reason, depending on the position in the axial direction in which the locking groove is provided, the distance from the bottom surface of the locking groove to the rolling surface may not be sufficient. In some cases, the outer diameter may be reduced.

  The present invention has been made in view of the above circumstances, and a transmission capable of improving the degree of freedom of the retaining position of a retaining ring when inserting a parallel rotating shaft into a case, a manufacturing method thereof, and such An object to be solved is to provide a retaining ring that can be suitably used for a simple transmission.

(1) A transmission according to the present invention for solving the above problems includes two rotating shafts whose axial directions are substantially parallel,
The inner ring has two inner rings that are respectively fixed to the outer peripheral side of one end of the two rotating shafts, and a bearing member side fixing groove formed in the circumferential direction on the outer peripheral surface, and is rotatable on the outer peripheral side of the inner ring. A bearing member provided with two outer rings arranged so as to restrict movement in a direction;
Each of the two outer rings has a case-side fixing groove formed on an inner surface at a position facing the bearing member-side fixing groove, and a work port that opens in the vicinity of one end of the rotating shaft in the axial direction. A case for defining a storage space for storing the rotating shaft and the bearing member;
Each of the bearing members arranged on the outer periphery of one end portion in the same direction of the two rotating shafts is opposed to each of the bearing member-side fixing grooves and each of the two bearing member-side fixing grooves. Operation is performed with a fixing portion that is fitted in both of the case side fixing grooves in a steady state and restricts relative movement in the axial direction between the outer ring and the case, and an operation tool inserted through the working port. Relative movement in the axial direction between the two outer rings and the case in the diameter expansion direction or the diameter reduction direction of the fixed portion by a series of operations by the operation tool provided in a possible portion And a retaining ring including an operation portion capable of deforming the fixing portion so as to simultaneously regulate or release the regulation.

  Freedom of position to form a locking groove for locking on the rotating shaft or case by enabling the diameter of the retaining ring corresponding to each of the rotating shafts arranged substantially parallel to each other in a series of operations. The degree can be improved.

  The invention of the above (1) can be adopted by arbitrarily adding at least one of the following configurations (2) and (3).

(2) The working port is located between the two rotating shafts. By providing the working port between the two rotating shafts, the size of the opening can be reduced. Moreover, since the opening can be made small, an increase in the area of the entire opening can be suppressed even if the openings are combined into one instead of providing a plurality.

(3) The fixed portion is fitted into one bearing member side fixed groove of the two rotating shafts, and the second fixed portion is fitted into the other bearing member side fixed groove of the two rotating shafts. A fixing part,
The first and second fixing parts have a substantially annular shape with a joint part that is partially divided;
The first and second fixing portions are adjacent to each other at the joint portion, and one or both of them are integrated. Since the structure of the above-described retaining ring is simple, manufacture and handling are facilitated.

(4) A transmission manufacturing method according to the present invention for solving the above-described problems is a method for manufacturing any one of the transmissions (1) to (3) described above. The manufacturing method of the present invention includes a first step of fitting the fixing portion of the retaining ring into the bearing member side fixing groove or the case side fixing groove;
A second step of expanding the shape of the fixed portion in the diameter increasing direction or contracting in the diameter decreasing direction;
A third step of assembling the two rotating shafts in the case so that the bearing member side fixing groove and the case side fixing groove coincide with each other in the axial direction;
And a fourth step of returning the shape of the fixed portion whose diameter has been expanded or reduced by a tool from the working port.

  Freedom of position to form a locking groove for locking on the rotating shaft or case by enabling the diameter of the retaining ring corresponding to each of the rotating shafts arranged substantially parallel to each other in a series of operations. The degree can be improved. Further, as an incidental effect, there is simplification of the manufacturing process by operating the retaining rings corresponding to the two rotating shafts at once.

(5) The retaining ring of the present invention that solves the above problem is the retaining ring according to any one of the above (1) to (3).

1 is a partial cross-sectional view of a transmission according to a first embodiment. FIG. 3 is a front view of a retaining ring employed in the transmission according to the first embodiment. FIG. 3 is a partially enlarged perspective view in the vicinity of a service hole of the transmission according to the first embodiment. FIG. 5 is a partial cross-sectional view illustrating a state in the middle of the transmission manufacturing method according to the first embodiment. FIG. 6 is a front view of a retaining ring employed in a transmission according to a second embodiment. FIG. 6 is a front view of a retaining ring adopted in a transmission according to a third embodiment. FIG. 6 is a front view of a retaining ring adopted in a transmission according to a fourth embodiment.

  Exemplary embodiments of the present invention will be described with reference to the drawings. The transmission according to the present embodiment is mounted on a vehicle. The shape of each component described in the drawings in the present embodiment is changed in order to facilitate explanation of the relative size between the overall size and the part.

(Embodiment 1)
Configuration As shown in FIG. 1, the transmission 1 according to the first embodiment includes an input shaft 2 and an output shaft 3 as rotating shafts disposed in a case 10. The input shaft 2 and the output shaft 3 are parallel in the axial direction. In FIG. 1, the part attached to the case 10 on one end side (the left side in the drawing) of the input shaft 2 and the output shaft 3 is shown in an enlarged manner, and details of other parts are omitted. ing.

  The input shaft 2 has an input shaft main body 21 and ball bearings 22 to 24 fixed as bearing members on one end side thereof. The ball bearings 22 to 24 have an inner ring 22, an outer ring 23, an inner ring 22, and a plurality of balls 24 disposed between the outer ring 23. Ball grooves are formed on the outer peripheral surface of the inner ring 22 and the inner peripheral surface of the outer ring 23. With this configuration, the inner ring 22 and the outer ring 24 are rotatable.

  One end side of the input shaft main body 21 has a reduced diameter at a portion where the inner rings 22 of the ball bearings 22 to 24 are disposed. The inner ring 22 is fixed to the outer peripheral side on one end side of the input shaft main body 21. An oil passage 211 that opens to one end side is formed inside the input shaft main body 02. Oil is supplied to a gear (not shown) disposed on the input shaft 2 through an oil passage 211. The inner diameter of the inner ring 22 is substantially the same as the outer diameter of the reduced diameter portion at one end of the input shaft main body 21, and the inner ring 22 is applied from the reduced diameter portion of the input shaft main body 21 toward the portion where the diameter increases. By being in contact, the movement of the input shaft 2 to the other end side (right side of the drawing) in the axial direction is limited. One end side of the inner ring 22 is in contact with the retaining ring 213 and movement to one end side is restricted. The retaining ring 213 is locked to a circumferential groove 212 provided in a reduced diameter portion provided on one end side of the input shaft main body 21. The retaining ring 213 is disposed in the axial direction relative to the input shaft main body 21 by engaging the inner ring 22 of the ball bearings 22 to 24 with the circumferential groove 212 after the inner ring 22 of the ball bearings 22 to 24 is disposed on the input shaft main body 21. I try not to move. A bearing member side fixing groove 231 that is a circumferential groove continuous in the circumferential direction is formed on the outer peripheral surface of the outer ring 23.

  The output shaft 3 has an output shaft main body 31 and ball bearings 32 to 34 as bearing members fixed to one end side thereof. The ball bearings 32 to 34 have an inner ring 32, an outer ring 33, an inner ring 32, and a plurality of balls 34 disposed between the outer ring 33. The inner ring 32 is fixed to the outer peripheral side on one end side of the output shaft main body 31. A ball groove is formed on the outer peripheral surface of the inner ring 32 and the inner peripheral surface of the outer ring 33 as a rolling surface with which the ball 34 can abut. With this configuration, the inner ring 32 and the outer ring 34 are rotatable.

  One end side of the output shaft main body 31 has a reduced diameter at a portion where the inner ring 32 of the ball bearings 32 to 34 is disposed. An oil passage 311 that opens to one end side is formed inside the output shaft main body 31. Oil is supplied to a gear (not shown) disposed on the output shaft 3 through an oil passage 311. The inner diameter of the inner ring 32 is substantially the same as the outer diameter of the reduced diameter portion on one end side of the output shaft main body 31, and the inner ring 32 is applied from the reduced diameter portion of the output shaft main body 31 toward the portion where the diameter increases. By being in contact, the movement of the output shaft 3 to the other end side (right side of the drawing) in the axial direction is limited. One end side of the inner ring 32 is in contact with the retaining ring 313 and movement to one end side is restricted. The retaining ring 313 is engaged with a circumferential groove 312 provided in a reduced diameter portion provided on one end side of the output shaft main body 31. After the inner ring 32 of the ball bearings 32 to 34 is disposed on the output shaft main body 31, the retaining ring 313 is engaged with the circumferential groove 312 so that the inner ring 32 is relative to the output shaft main body 31 in the axial direction. I try not to move. A bearing member side fixing groove 331 that is a circumferential groove continuous in the circumferential direction is formed on the outer peripheral surface of the outer ring 33.

  The case 10 has a bearing housing space 11a that is a recess into which an outer ring 23 of ball bearings 22 to 24 as a bearing member fixed to one end of the input shaft 2 can be fitted on the outer peripheral surface without a gap. When the outer ring 24 is fitted into the inner peripheral surface of the bearing housing space 11a, the case side is provided continuously in the circumferential direction at a portion facing the bearing member-side fixing groove 231 formed on the outer peripheral surface of the outer ring 24. A fixing groove 112 is formed.

  The case 10 has a bearing housing space 11b that is a recess into which the outer ring 23 of ball bearings 32 to 34 as a bearing member fixed to one end of the output shaft 3 can be fitted on the outer peripheral surface without any gap. When the outer ring 34 is fitted into the inner peripheral surface of the bearing housing space 11b, the case side is provided continuously in the circumferential direction at a portion facing the bearing member-side fixing groove 331 formed on the outer peripheral surface of the outer ring 34. A fixing groove 113 is formed.

  The input shaft 2 includes a bearing member side fixing groove 231 provided on the outer peripheral surface of the outer ring 23 of the ball bearings 22 to 24 and a case side fixing groove 112 provided on the inner surface of the bearing housing space 11a of the case 10. On the other hand, the relative movement in the axial direction is restricted by locking the retaining ring 4.

  The output shaft 3 includes a bearing member-side fixing groove 331 provided on the outer peripheral surface of the outer ring 33 of the ball bearings 32 to 34 and a case-side fixing groove 113 provided on the inner surface of the bearing housing space 11b of the case 10. On the other hand, the relative movement in the axial direction is restricted by locking the retaining ring 4.

  In the retaining ring 41, a fixed portion 411 that is a portion for locking the input shaft 2 in the case 10 and a portion for locking the output shaft 3 in the case 10 are integrated. As shown in FIG. 2, the retaining ring 41 has a shape similar to the shape of “8” in which the overall outline is constricted in the middle of the shape of “O”. Operation holes 41a and 42b for inserting and locking the tool are provided at the most constricted portions. It can also be said that this form is an integrated form of two retaining rings. For example, for two rings A and B (partially divided into two in the middle in the left-right direction in FIG. 2) that are partly divided to form a joint part, the part of the joint part is integrated adjacently. It can also be said that it is a form.

  The retaining ring 41 can be deformed in the diameter increasing direction by inserting a tool into the operation holes 41a and 41b and applying a force in the direction of the arrow shown in FIG. This operation is possible by a series of operations. By deforming in the diameter increasing direction, the A portion (first fixing portion 411a) and the B portion (second fixing portion 411b) of the retaining ring 41 can be increased in diameter at the same time. The retaining ring 41 can be locked to both the bearing member side fixing groove 331 and the case side fixing groove 113 in a steady state.

  As shown in FIG. 3, the operation holes 41 a and 41 b are operated by an operation tool inserted through the work ports 12 a and 12 b provided in the service hole 12 provided in the case 10. The size of the work ports 12a and 12b is set such that the operation holes 41a and 41b can be sufficiently displaced. The service hole 12 is sealed with a lid (not shown). A male screw (not shown) is screwed on the outer peripheral surface of the lid, and the service hole 12 is sealed by screwing with a female screw (not shown) screwed on the inner periphery of the service hole 12. A sealing material (not shown) may be interposed between the lid and the service hole 12. The retaining ring 41 of this embodiment locks the input shaft 2 and the output shaft 3 at the same position in the axial direction.

-Assembly The manufacturing method of the transmission of this embodiment is demonstrated below. A process of inserting the input shaft 2 and the output shaft 3 into the case 10 which is a characteristic part of the manufacturing method of the transmission will be described.

  In order to manufacture the input shaft 2, ball bearings 22 to 24 are fixed to one end side of the input shaft main body 21. Specifically, first, the inner ring 22 of the ball bearings 22 to 24 is inserted into the reduced diameter portion on one end side of the input shaft main body 21 until it comes into contact with the portion whose diameter increases from the reduced diameter portion. Since the inner diameter of the inner ring 22 is substantially the same as the outer diameter of the reduced diameter portion of the input shaft main body 21, the inner ring 22 is in close contact with the outer periphery of the input shaft main body 21. Thereafter, the retaining ring 213 is locked to the circumferential groove 212 provided in the reduced diameter portion provided on one end side of the input shaft main body 21. As a result, the inner ring 22 does not move relative to the input shaft main body 21 in the axial direction.

  Next, in order to manufacture the output shaft 3, ball bearings 32 to 34 are fixed to one end side of the output shaft main body 31. Specifically, first, the inner ring 32 of the ball bearings 32 to 34 is inserted into the reduced diameter portion on one end side of the output shaft main body 31 until it comes into contact with the portion whose diameter increases from the reduced diameter portion. Since the inner diameter of the inner ring 32 is substantially the same as the outer diameter of the reduced diameter portion of the output shaft main body 31, the inner ring 32 is in close contact with the outer periphery of the output shaft main body 31. Thereafter, the retaining ring 313 is engaged with a circumferential groove 312 provided in a reduced diameter portion provided on one end side of the output shaft main body 31. As a result, the inner ring 32 does not move relative to the output shaft main body 31 in the axial direction.

  Each assembly in the input shaft 2 and the output shaft 3 may be performed simultaneously, and may be performed separately independently. The input shaft 2 and the output shaft 3 are each provided with components (gear, speed change mechanism, etc.) not shown.

  Thereafter, the input shaft 2 and the output shaft 3 are inserted and fixed in the case 10. The input shaft 2 and the output shaft 3 are fixed to the case 10 (restriction of the relative position in the axial direction of the input shaft 2 and the output shaft 3). Bearing member side fixing grooves 231 and 331 provided on outer peripheries of outer rings 23 and 33 of 24 and 32 to 34, and case side fixing grooves 112 formed on inner peripheral surfaces of bearing housing spaces 11 a and 11 b of the case body 11. , 113 is engaged with the retaining ring 41. A similar configuration can be adopted for the other end portions of the input shaft 2 and the output shaft 3 to restrict relative movement in the axial direction.

  Here, in the general case 10, it is necessary to assemble the input shaft 2 and the output shaft 3 at the same time. For example, when the case 10 is divided into two parts, the input shaft 2 and the output shaft 3 are fixed to one case body (not shown) and the other end is fixed to the other case body 11. Since the input shaft 2 and the output shaft 3 can be fixed to the case body by inserting a tool or a hand from the outside, the configuration is not particularly limited.

  When fixing one end of the input shaft 2 and the output shaft 3 in the case main body 11, first, the input shaft 2 and the output shaft 3 are fixed to one case main body, and then one end of each is placed in the case main body 11. Will be inserted into. Prior to insertion, the retaining ring 41 is inserted and locked in the case-side fixing grooves 112 and 113 formed in the inner peripheral surfaces of the bearing housing spaces 11a and 11b of the case body 11 (first step). As a result of the insertion, as shown in FIG. 4, one end side of each of the ball bearings 22 to 24 and 32 to 34 of the input shaft 2 and the output shaft 3 is in contact with the retaining ring 41 and restricted so that it cannot be inserted any more. become.

  In the prior art in which the retaining ring is a separate member for the input shaft 2 and the output shaft 3, the diameters of the retaining rings are increased by operating the retaining rings at the same time, or the position of the retaining ring in the axial direction is set to the input shaft 2 and the output shaft The restriction is released by shifting at 3. When expanding the diameter at the same time, use a tool that can operate both at the same time, or work by a plurality of people. When the position in the axial direction is shifted, the diameter is sequentially increased by operating the retaining ring from the input shaft 2 and the output shaft 3 that come into contact with the retaining ring first.

  In the present embodiment, the retaining ring 41 is integrated on both the input shaft 2 and the output shaft 3 side, and a pair of operation holes 41a and 42b are operated (in the direction of the arrow in FIG. 3) as in the conventional retaining ring. The retaining ring 41 can be expanded in diameter by both the input shaft 2 and the output shaft 3 (A and B) only by (displacement) (second step). As a result, since the retaining ring 41 is retracted inside both the case-side fixing grooves 112 and 113, the restriction of the movement of the input shaft 2 and the output shaft 3 by the retaining ring 41 is released, and the input shaft 2 and the output shaft 3. Can be inserted into the case body 11. After one side of the outer rings 23 and 33 exceeds the case-side fixing grooves 112 and 113 where the retaining ring 41 is locked, the operation holes 41a and 42b are not obstructed even if the operation holes 41a and 42b are not operated. If the input shaft 2 and the output shaft 3 are inserted into the case body 11 as they are, the relative positions in the axial direction of the case side fixing grooves 112 and 113 and the bearing member side fixing grooves 231 and 331 coincide with each other ( When the state shown in FIG. 1 is reached, the retaining ring 41 is elastically reduced in diameter in the third step), and the retaining ring 41 is engaged with both the case-side fixing grooves 112 and 113 and the bearing member-side fixing grooves 231 and 331. Accordingly, the input shaft 2 and the output shaft 3 are restricted from relative movement in the axial direction with respect to the case body 11. Specifically, the first fixing portion 411 a is locked to the case side fixing groove 112 and the bearing member side fixing groove 231, and the second fixing portion 411 b is locked to the case side fixing groove 113 and the bearing member side fixing groove 331. . These retaining rings 41 are operated through a service hole 12 provided in the case body 11. The service hole 12 is then sealed with a lid. One case body and the other case body 11 are then fixed.

(Embodiments 2 to 4)
The retaining ring 41 in the first embodiment can be replaced with retaining rings 42 to 44 (embodiments 2 to 4) having other forms. The retaining ring of the second embodiment is a retaining ring 42 shown in FIG. The retaining ring 42 has an “S” -shaped outline. Operation holes 42a and 42b are provided at both ends of the "S" shape, and the diameter is expanded at both A (first fixing portion 42a) and B (second fixing portion 42b) by being displaced in the direction of the arrow. . Since the retaining ring 42 has a joint part that is partly divided, displacement in the diameter increasing direction and the diameter decreasing direction is facilitated. Similarly, Embodiment 4 described later is easily displaced.

  As shown in FIG. 6, the retaining ring 43 according to the third embodiment is extended to both ends (both ends of the “S”) of the retaining ring 42 according to the second embodiment to form a shape “8”. It is a thing. By extending both ends and overlapping, the length of locking between the retaining ring 43, the case side fixing grooves 112 and 113, and the bearing member side fixing grooves 231 and 331 can be increased. As a result, the effect of the relative movement restriction in the axial direction by the retaining ring is increased.

As shown in FIG. 7, the retaining ring 44 of the fourth embodiment is the retaining ring 41 of the first embodiment.
It has a general shape of a “C” shape with an abutment part of which is cut out. The divided part is one of the most constricted parts. Operation holes 44a and 44b are provided at both ends of the letter "C", and the diameter is expanded at both A (first fixing part 44a) and B (second fixing part 44b) by displacing in the direction of the arrow. .

(Modification)
The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the retaining rings 41 to 44 are locked in advance in the case-side fixing grooves 112 and 113 of the case main body 11 and the diameter is once expanded in accordance with the subsequent insertion of the input shaft 3 and the output shaft 3. However, the retaining rings 41 to 44 are first locked in the bearing member side fixing grooves 231 and 331 to reduce the diameter when inserted into the case body 11 (displaced to the opposite side of the arrow described in each drawing). A configuration that allows them to be used can also be adopted.

  In the above-described embodiment, the two rings A and B of the retaining ring are in the same position in the axial direction when locked to the case body 11 (as a whole, they are flat), The relative positions in the axial direction of the rings A and B may be shifted. In this case, even if the relative positions in the axial direction of the one end portion of the input shaft 2 and the one end portion of the output shaft 3 are shifted, the retaining ring can be locked simultaneously.

  Further, as the retaining ring, in addition to a form in which those used for the two rotating shafts are integrated, two conventional retaining rings can be employed as they are. In that case, there is provided a rotation restricting means for restricting the retaining ring from rotating relative to each other by contacting the abutment portion of the retaining ring when the retaining ring is engaged with the case-side fixing grooves 112 and 113, respectively. Thus, the two retaining rings can be operated simultaneously by operating the side where the relative rotation is not restricted at the joint portion of each retaining ring.

DESCRIPTION OF SYMBOLS 1 ... Transmission, 10 ... Case, 11 ... Case main body, 2 ... Input shaft, 21 ... Input shaft main body, 22 ... Inner ring (ball bearing), 23 ... Outer ring (ball bearing), 24 ... Ball (ball bearing) DESCRIPTION OF SYMBOLS 3 ... Output shaft, 31 ... Output shaft main body, 32 ... Inner ring (ball bearing), 33 ... Outer ring (ball bearing), 34 ... Ball (ball bearing), 41-44 ... Retaining ring

Claims (5)

Two rotation axes whose axial directions are substantially parallel;
The inner ring has two inner rings that are respectively fixed to the outer peripheral side of one end of the two rotating shafts, and a bearing member side fixing groove formed in the circumferential direction on the outer peripheral surface. A bearing member provided with two outer rings arranged so as to restrict movement in a direction;
Each of the two outer rings has a case-side fixing groove formed on an inner surface at a position facing the bearing member-side fixing groove, and a work port that opens in the vicinity of one end of the rotating shaft in the axial direction. A case for defining a storage space for storing the rotating shaft and the bearing member;
Each of the bearing members arranged on the outer periphery of one end portion in the same direction of the two rotating shafts is opposed to each of the bearing member-side fixing grooves and each of the two bearing member-side fixing grooves. Operation is performed with a fixing portion that is fitted in both of the case side fixing grooves in a steady state and restricts relative movement in the axial direction between the outer ring and the case, and an operation tool inserted through the working port. Relative movement in the axial direction between the two outer rings and the case in the diameter expansion direction or the diameter reduction direction of the fixed portion by a series of operations by the operation tool provided in a possible portion A retaining ring comprising an operation portion capable of deforming the fixing portion so as to simultaneously regulate or release the regulation,
Having a transmission.   The transmission according to claim 1, wherein the working port is located between the two rotation shafts. The fixed portion includes a first fixed portion fitted into one bearing member side fixed groove of the two rotary shafts, and a second fixed portion fitted into the other bearing member side fixed groove of the two rotary shafts. Have
The first and second fixing parts have a substantially annular shape with a joint part that is partially divided;
The transmission according to claim 1 or 2, wherein the first fixing portion and the second fixing portion are adjacent to each other, and one or both of them are integrated. It is a manufacturing method of the transmission given in any 1 paragraph of Claims 1-3,
A first step of fitting the fixing portion of the retaining ring into the bearing member side fixing groove or the case side fixing groove;
A second step of expanding the shape of the fixed portion in the diameter increasing direction or contracting in the diameter decreasing direction;
A third step of assembling the two rotating shafts in the case so that the bearing member side fixing groove and the case side fixing groove coincide with each other in the axial direction;
And a fourth step of returning the shape of the fixed portion whose diameter has been increased or reduced by a tool from the working port.   The retaining ring according to any one of claims 1 to 3.

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