JP2014196753A - Dog clutch gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dog clutch gear in which a cylindrical boss part and an annular rim part formed of a tooth part on an outer circumference are connected on an annular wall part, a plurality of locking ribs which bind the boss part and the rim part and have a width broadened as proceeding to the rim part side are protruded from the annular wall part to the axial direction, a flat contact surface which comes into contact with a male type dog is formed on one side of both lateral surfaces of the locking rib, and dog clutch gears formed of an outer side corner curved surface part having a curvature radius larger than that of an inner side corner curved surface part respectively formed on both lateral surfaces of the locking rib and a connection part of the boss part, on both lateral surfaces of the locking rib and the connection part of the rim part have such a shape that a stress can be dispersed to the whole of the locking rib.SOLUTION: A protrusion part 79 which protrudes from an outer side corner curved surface part 78 to the circumferential direction is integrally formed on an outer side corner curved surface part 78 such that both sides of a protrusion part 79 are connected to the outer side corner curved surface part 78 on a first curved surface 81 of a boss part 70 side and a second curved surface 82 of the rim part 71 side.

Description

  The present invention connects a cylindrical boss part supported by a rotating shaft, an annular rim part coaxially surrounding the boss part and having teeth formed on the outer periphery, and the boss part and the rim part. A plurality of annular wall portions, extending radially from the boss portion and the rim portion, and formed so as to increase in width toward the rim portion side, and project from the annular wall portion in the axial direction of the rotating shaft. A flat contact surface that contacts a male dog on one of both side surfaces of the locking rib facing both sides in the circumferential direction of the rotating shaft, and the locking rib. Outer corner curved surface portions having a larger radius of curvature than the inner corner curved surface portions formed on the both side surfaces and the continuous portion of the boss portion are formed on the both side surfaces of the locking rib and the continuous portion of the rim portion, respectively. The present invention relates to a dog clutch gear.

  Such a dog clutch is already known from Patent Document 1, and in this case, the locking rib is on the rim portion side in order to avoid stress concentration when the male dog abuts against one side surface of the locking rib. The inner corner curved surface portion is formed on both side surfaces of the locking rib and the connecting portion of the boss portion, and the outside is formed on both side surfaces of the locking rib and the continuous portion of the rim portion. A corner curved surface portion is formed.

JP 2009-209950 A

  By the way, the dog abuts against the portion of the side surface of the locking rib close to the boss portion, so the radius of curvature of the inner corner curved surface portion must be reduced, whereas the outer corner curved surface portion is directed to the side surface of the locking rib. Since it is away from the contact portion of the dog, the radius of curvature can be made relatively large. For this reason, stress concentration is more likely to occur in the inner corner curved surface portion on the boss side than in the outer corner curved surface portion, and a material having high rigidity is used or a process for increasing rigidity is applied. It is desired to develop a shape that can be dispersed.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a dog clutch gear having a shape capable of dispersing stress over the entire locking rib.

  In order to achieve the above object, the present invention provides a cylindrical boss portion supported by a rotating shaft, an annular rim portion coaxially surrounding the boss portion and having teeth formed on the outer periphery, and the boss portion. And an annular wall portion that connects the rim portions, and extends radially from the boss portion and the rim portion, and is formed so as to become wider toward the rim portion side, and is rotated from the annular wall portion. A flat contact surface that has a plurality of locking ribs that protrude in the axial direction of the shaft, and that contacts a male dog on one of both side surfaces of the locking rib that faces both sides of the rotating shaft in the circumferential direction The outer corner curved surface portion having a larger radius of curvature than the inner corner curved surface portion formed on the both side surfaces of the locking rib and the connecting portion of the boss portion is formed on the both side surfaces and the rim of the locking rib. Dog clutch gears respectively formed on the continuous connecting portion In the outer corner curved surface portion, the protruding portion that protrudes in the circumferential direction from the outer corner curved surface portion is the first curved surface on the boss portion side and the second curved surface on the rim portion side on both sides of the raised portion. A first feature is that the outer corner curved surface portion is integrally formed.

  In addition to the configuration of the first feature, the present invention has a second feature that the radius of curvature of the first curved surface is set smaller than the radius of curvature of the second curved surface.

  In the present invention, in addition to the configuration of the first or second feature, a third curved surface is formed on the outer peripheral surface of the boss portion and the connecting portion of the annular wall portion, and when viewed from the rotation direction of the rotary shaft A third feature is that a fourth curved surface having the same radius of curvature as the third curved surface is formed at the connecting portion of the raised portion and the annular wall portion.

  In the present invention, in addition to any one of the first to third features, a fifth curved surface is formed on the side surface of the locking rib and the connecting portion of the annular wall portion, and the longitudinal direction of the locking rib A fourth feature is that a sixth curved surface having a radius of curvature larger than that of the fifth curved surface when viewed from the above is formed in the joint portion of the raised portion and the annular wall portion.

  According to the present invention, in addition to any one of the first to fourth features, a third curved surface is formed on the outer peripheral surface of the boss portion and the connecting portion of the annular wall portion, and the rotational axis of the rotating shaft is A fifth feature is that a seventh curved surface having a radius of curvature larger than the third curved surface when viewed is formed on the inner peripheral surface of the rim portion and the continuous portion of the annular wall portion.

  In addition to any of the configurations of the first to fifth features of the present invention, the front end surface of the locking rib opposite to the annular wall portion and the continuous portion of the inner peripheral surface of the rim portion, A sixth feature is that an eighth curved surface smoothly connected to the inner peripheral surface of the rim portion and a stepped portion formed by cutting a part of the eighth curved surface on the boss portion side are formed.

  According to the present invention, in addition to the configuration of the sixth feature, the stepped portion extending along the first virtual circle centered on the central axis of the rotation shaft is formed on the rim portion side end portion of the locking rib. A seventh feature is that the two ridges are formed so as to straddle.

  Furthermore, in addition to any of the configurations of the first to seventh features, the present invention passes through the tops of the two raised portions formed at the rim portion side end portions of the locking ribs, and the rotation shaft. The length between the tops of the two raised portions along the second virtual circle centered on the central axis is set to be approximately twice the width of the locking rib on the second virtual circle. The eighth feature.

  According to the first feature of the present invention, the ridge portion is formed integrally with the outer corner curved surface portion so as to be connected to the outer corner curved surface portion on the rim portion side through the curved surface, whereby the inner corner on the boss portion side is formed. It is possible to disperse the stress, which was easily concentrated on the curved surface portion, to the rim portion side, to balance the stress on the entire locking rib, and to increase the rigidity only by changing the shape.

  Further, according to the second feature of the present invention, the curvature radius of the first curved surface on the boss portion side of the curved surface between the raised portion and the outer corner curved surface portion is smaller than the curvature radius of the second curved surface on the rim portion side. The stress acting on the locking rib can be further distributed to the raised portion side.

  According to the third feature of the present invention, the third curved surface formed on the outer peripheral surface of the boss portion and the continuous portion of the annular wall portion and the fourth curvature having the same radius of curvature when viewed from the rotational direction of the rotary shaft. Since the curved surface is formed in the connecting portion of the raised portion and the annular wall portion, the rigidity of the connecting portion of the annular wall portion can be made equal on the boss portion side and the raised portion side of the locking rib. It is possible to easily disperse the stress acting on the ridge portion side.

  According to the 4th characteristic of this invention, when it sees from the longitudinal direction of a latching rib, the 6th of a curvature radius larger than the 5th curved surface formed in the side surface of a latching rib and the connection part of an annular wall part is provided. Since the curved surface is formed in the continuous portion of the raised portion and the annular wall portion, the radius of curvature of the sixth curved surface between the raised portion and the annular wall portion where the male dog does not contact is relatively large, and particularly a load is applied. Rigidity can be increased by increasing the thickness of the annular wall portion on the side closer to the outer peripheral tooth portion.

  According to the fifth feature of the present invention, the seventh curved surface having a larger radius of curvature than the third curved surface between the outer peripheral surface of the boss portion and the annular wall portion when viewed from the rotational direction of the rotating shaft is the inner periphery of the rim portion. Since it is formed in the connection part of a surface and an annular wall part, the thickness of an annular wall part can be increased on the side near the tooth part of the outer periphery where especially a load is applied, and rigidity can be improved.

  According to the sixth feature of the present invention, the eighth curved surface and a part of the eighth curved surface on the boss portion side are cut off at the connecting portion of the distal end surface of the locking rib and the inner peripheral surface of the rim portion. Therefore, when engaging with the dog to be engaged while rotating relatively, the edge of the edge of the dog against the eighth curved surface is avoided and wear due to the edge is prevented. The possibility of occurring can be eliminated.

  According to the seventh feature of the present invention, since the step portion is formed across the two raised portions, the width of the locking rib is increased by forming the raised portion, so that the edge with the dog Although the range in which the hit may occur becomes longer, the occurrence of wear can be suppressed by preventing the hit of the edge.

  Furthermore, according to the eighth feature of the present invention, since the length between the tops of the two raised portions is set to almost twice the length of the locking rib, the width of the locking rib is reduced by forming the raised portion. While suppressing the increase in weight due to being too large, the stress distribution due to the formation of the raised portion can be effectively obtained with an appropriate width.

It is principal part sectional drawing of an internal combustion engine. FIG. 2 is an enlarged view of a portion indicated by an arrow 2 in FIG. 1. It is a front view of the 2nd speed driven gear seen from the 3-3 arrow direction of FIG. FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. FIG. 5 is an enlarged view of a part indicated by an arrow 5 in FIG. 3. FIG. 6 is an enlarged sectional view taken along line 6-6 of FIG. It is a principal part enlarged view of FIG. It is a figure which shows the stress distribution of a locking rib.

  An embodiment of the present invention will be described with reference to FIGS. 1 to 8. First, in FIG. 1, for example, a crankshaft 13 is rotatable in a crankcase 11 of a two-cylinder internal combustion engine mounted on a motorcycle. Pistons 15 that are supported and are slidably fitted to the two cylinder bores 14, 14 of the cylinder block 12 are connected to the crankshaft 13.

  A generator cover 20 forming a generator chamber 16 is coupled to the left side surface of the crankcase 11 with the crankcase 11, and a rotor 18 of a generator 17 accommodated in the generator chamber 16 is provided. The stator 19 of the generator 17 is fixed to the generator cover 20 so as to be surrounded by the rotor 18. The stator 19 is fixed to the end of the crankshaft 13 that has entered the generator chamber 16.

  A driven gear 22 constituting a part of a reduction gear train 21 that transmits power from a starter motor (not shown) fixed to the crankcase 11 is connected to the rotor 18 via a one-way clutch 23. .

  A clutch cover 25 that forms a clutch chamber 24 is connected to the right side surface of the crankcase 11 and the crankcase 11 is fixed to the end of the crankshaft 13 in the clutch chamber 24. A rotation speed sensor 27 disposed in the clutch chamber 24 is fixed to the clutch cover 25 so as to face the outer periphery of the pulsar 26.

  In the crankcase 11, there is a first main shaft 28 and a second main shaft 29 that have an axis parallel to the crankshaft 13 and are rotatably supported by the crankcase 11, and a countershaft 30. A transmission M having a gear train of a plurality of shift stages that can be selectively established, for example, first to sixth gear trains G1 to G6 is housed.

  The first and second main shafts 28 and 29 are arranged coaxially so that the first main shaft 28 is fitted into the second main shaft 29 so as to be relatively rotatable, and the right side wall of the crankcase 11 is arranged. One end portion of the first main shaft 28 penetrating rotatably is rotatably supported on the left side wall of the crankcase 11, and the other end portion of the first main shaft 28 is rotatably supported by the clutch cover 25. The second main shaft 29 coaxially surrounds the first main shaft 28 and passes through the right side wall of the crankcase 11 while being rotatably supported, and between the first and second main shafts 28 and 29. Are provided with a plurality of needle bearings 31, 31.

  The rotational power from the crankshaft 13 can be transmitted to the first main shaft 28 via the primary reduction gear 32, the damper spring 35 and the first multi-plate clutch 33, and the primary reduction gear 32, the damper spring 35 and the first It can be transmitted to the second main shaft 29 via the two-multiplate clutch 34.

  One end portion of the countershaft 30 penetrates the left side wall of the crankcase 11 in a rotatable and airtight manner and protrudes from the rear portion of the left side wall of the crankcase 11, and the other end portion of the countershaft 30 is connected to the crankcase 11. It is rotatably supported on the right side wall.

  A drive sprocket 36 is fixed to one end portion of the countershaft 30 protruding from the left side wall of the crankcase 11, and a transmission M is provided by an endless chain (not shown) wound around the drive sprocket 36. Is transmitted to a rear wheel (not shown).

  Between the first main shaft 28 and the counter shaft 30, a plurality of speed stages, for example, a first speed gear train G1, a third gear train G3, and a fifth speed gear train G5 are provided, and between the second main shaft 29 and the counter shaft 30. Are provided with a plurality of speed stages different from those between the first main shaft 28 and the counter shaft 30, for example, a second speed gear train G2, a fourth speed gear train G4, and a sixth speed gear train G6.

  In FIG. 2, the first speed gear train G1 is supported by the first speed drive gear 41 formed integrally with the first main shaft 28 and the countershaft 30 so as to be relatively rotatable while disabling relative axial movement. A third-speed drive gear 43, which is supported by the first main shaft 28 so as to be capable of relative movement in the axial direction and not to be rotatable relative to the first main shaft 28; The counter gear 30 includes a third-speed driven gear 44 that is supported so that relative movement in the axial direction relative to the countershaft 30 is disabled. The fifth-speed gear train G5 disables relative movement in the axial direction relative to the first main shaft 28. The fifth-speed drive gear 45 is supported so as to be capable of relative rotation, and the fifth-speed driven gear 46 is supported so as to be capable of relative movement in the axial direction on the countershaft 30 so as not to be capable of relative rotation.

  The second speed gear train G2 is a second speed drive gear 47 formed integrally with the second main shaft 28, and a second speed supported on the countershaft 30 so as to be relatively rotatable while disabling relative movement in the axial direction. The fourth speed gear train G4 is composed of a driven gear 48, and a fourth speed drive gear 49 supported on the second main shaft 28 so as to be capable of relative movement in the axial direction and not to rotate relative to the second main shaft 28. The fourth-speed driven gear 50 is supported so that relative movement in the axial direction is disabled and relative rotation is possible, and the sixth gear train G6 is relatively rotatable in the axial direction relative to the second main shaft 28. It comprises a sixth speed drive gear 51 that is supported and a sixth speed driven gear 52 that is supported on the countershaft 30 so as to be capable of relative movement in the axial direction but not to be relatively rotatable.

  Between the fourth speed drive gear 49 and the fifth speed drive gear 45, the first main shaft 28 is supported by a first dog member 53 that is capable of relative movement in the axial direction so as not to be relatively rotatable. A third speed drive gear 43 is formed integrally with the first dog member 53. The first dog member 53 has a male first dog 54 disposed on the side surface facing the fifth speed drive gear 45, and the fifth speed drive gear 45 includes a first dog member 54. The first engaging recesses 55 are formed to engage the dogs 54 in a detachable manner. In addition, the second dog member 56 that can move in the axial direction relative to the second main shaft 28 at a position where the sixth-speed drive gear 51 is sandwiched between the second-speed drive gear 47 and the second-speed drive gear 47 becomes relatively non-rotatable. The fourth dog drive gear 49 is integrally formed with the second dog member 56. Further, the second dog member 56 has male second dogs 57 arranged on the side surface facing the sixth speed drive gear 51, and the sixth speed drive gear 51 includes the second dog member 57. Second engagement recesses 58 are formed to engage the two dog teeth 57 in a releasable manner.

  Between the first speed driven gear 42 and the third speed driven gear 44, a third dog member 59 capable of relative movement in the axial direction is supported on the countershaft 30 so as not to be relatively rotatable. The third gear member 59 is integrally formed with the third dog member 59. The third dog member 59 is disposed on the side surface facing the male third dog 60... Disposed on the side surface facing the first speed driven gear 42 and the third speed driven gear 44. There are male fourth dogs 61... The first speed driven gear 42 is formed with third engagement recesses 62 for releasably engaging the third dogs 60. The third-speed driven gear 44 is formed with fourth engagement recesses 63 that detachably engage the fourth dogs 61.

  Between the second speed driven gear 48 and the fourth speed driven gear 50, a fourth dog member 64 is mounted on the countershaft 30 so as to be capable of relative movement in the axial direction. A fourth gear driven gear 52 is formed integrally with the fourth dog member 64. The fourth dog member 64 is disposed on the side surface facing the male fifth dog 65... Disposed on the side surface facing the second speed driven gear 48 and the fourth speed driven gear 50. The second engaging gear 48 is formed with fifth engaging recesses 67 for releasably engaging the fifth dogs 65, and so on. The fourth gear driven gear 50 is formed with sixth engaging recesses 68 for detachably engaging the sixth dogs 66.

  The first dog 54 of the first dog member 53 and the first engaging recess 55 of the fifth gear 45 are driven by the axial movement of the first dog member 53 and the first main shaft 28. A first dog clutch C1 for switching between power transmission / reception between the fifth speed drive gear 45 and the second engagement of the second dog 57 ... of the second dog member 56 and the sixth speed drive gear 51 is provided. The recesses 58 ... constitute a second dog clutch C2 that switches between power connection and disconnection between the second main shaft 29 and the sixth speed drive gear 51 by the axial movement of the second dog member 56. Further, the third dog 60 of the third dog member 59 and the third engaging recess 62 of the first speed driven gear 42 are moved by the axial movement of the third dog member 59. The third dog clutch C3 for switching the power transmission / reception between the motor 42 and the countershaft 30 is configured, and the fourth dog 61... Of the third dog member 59 and the third engagement of the third speed driven gear 44 are configured. The combined recesses 62 ... constitute a fourth dog clutch C4 that switches between power transmission / disconnection between the third speed driven gear 44 and the countershaft 30 by the axial movement of the third dog member 59. Furthermore, the fifth dog 65 of the fourth dog member 64 and the fifth engagement recess 67 of the second speed driven gear 48 are moved by the second speed driven gear 48 by the axial movement of the fourth dog member 64. And the fifth dog clutch C5 for switching the power transmission between the counter shaft 30 and the sixth dog 66... Of the fourth dog member 64 and the sixth engagement recess of the fourth speed driven gear 50. 68 ... constitutes a sixth dog clutch C6 for switching the power transmission / reception between the fourth speed driven gear 50 and the countershaft 30 by the axial movement of the fourth dog member 64.

  In such a transmission M, the axial positions of the first to fourth dog members 53, 56, 60, and 64 are controlled to switch the connection / disconnection of the first to sixth dog clutches C1 to C6. The first to sixth speed gear trains G1 to G6 are alternatively established.

  In the first to sixth dog clutches C1 to C6, the fifth speed driving gear 45, the sixth speed driving gear 51, the first speed driven gear 42, the third speed driven gear 44, the second speed driven gear 48, and the fourth speed driven. The gear 50 is formed as a dog clutch gear of the present invention, and basically has the same shape. As a representative example, the shape of the second speed driven gear 48 will be described in detail below. Detailed descriptions of the shapes of the fifth speed driving gear 45, the sixth speed driving gear 51, the first speed driven gear 42, the third speed driven gear 44, and the fourth speed driven gear 50 are omitted.

  3 and 4, the second speed driven gear 48 includes a cylindrical boss portion 70 supported by the counter shaft 30 that is a rotation shaft, and a boss portion 70 coaxially surrounding the boss portion 70 and a tooth portion 74 formed on the outer periphery. An annular rim portion 71, an annular wall portion 72 connecting the boss portion 70 and the rim portion 71, and a rim portion 71 side extending radially and connecting the boss portion 70 and the rim portion 71. Are integrally formed with a plurality of locking ribs 73, 73... Which are formed so as to become wider toward the center of the annular wall 72 and protrude from the annular wall portion 72 in the axial direction of the rotation shaft. A fifth engaging recess 67 is formed between the locking ribs 73 adjacent to each other between 71 and 71.

  Referring also to FIG. 5, a flat contact surface 75 facing one side of both sides of the locking rib 73 facing both sides of the countershaft 30 in the circumferential direction so as to face rearward along the rotation direction of the countershaft 30. Inner corner curved surface portions 77 and 77 are formed on the both side surfaces of the locking rib 73 and the connecting portion of the boss portion 70, respectively, and the both side surfaces of the locking rib 73 and the rim portion 71. Outer corner curved surface portions 78 and 78 are respectively formed in the continuous portions. Moreover, the radius of curvature RB of the outer corner curved surface portion 78 is set larger than the radius of curvature RA of the inner corner curved surface portion 77.

  Further, the outer corner curved surface portion 78 has a raised portion 79 protruding from the outer corner curved surface portion 78 in the circumferential direction, and both sides of the raised portion 79 are the first curved surface 81 on the boss portion 70 side and the rim portion 71. The second curved surface 82 is formed integrally with the outer corner curved surface portion 78 so that the curvature radius R1 of the first curved surface 81 is set smaller than the curvature radius R2 of the second curved surface 82.

  A third curved surface 83 is formed on the outer peripheral surface of the boss portion 70 and the connecting portion of the annular wall portion 72, and is the same as the radius of curvature R3 of the third curved surface 83 when viewed from the rotation direction 76 of the countershaft 30. A fourth curved surface 84 having a radius of curvature R4 is formed in the protruding portion 79 and the continuous portion of the annular wall portion 72.

  In FIG. 6, a fifth curved surface 85 is formed on the side surface of the locking rib 73 and the continuous portion of the annular wall portion 72, and the curvature of the fifth curved surface 85 when viewed from the longitudinal direction of the locking rib 73. A sixth curved face 86 having a radius of curvature R6 larger than the radius R5 is formed at the connecting portion of the raised portion 79 and the annular wall portion 72.

  A radius of curvature R3 of a third curved surface 83 formed on the outer peripheral surface of the boss portion 70 and the continuous portion of the annular wall portion 72 is provided on the inner peripheral surface of the rim portion 71 and the continuous portion of the annular wall portion 72. A seventh curved surface 87 having a large radius of curvature R7 when viewed from the rotational direction 76 of the countershaft 30 is formed.

  Referring also to FIG. 7, the inner peripheral surface of the rim portion 71 is connected to the front end surface of the locking rib 73 opposite to the annular wall portion 72 and the inner peripheral surface of the rim portion 71. An eighth curved surface 88 that is smoothly connected to the surface, and a stepped portion 89 that is formed by cutting a part of the eighth curved surface 88 on the boss portion 70 side are formed.

  Further, the two raised portions formed at the end portion of the locking rib 73 on the rim portion 71 side, the stepped portion 89 extending along the first virtual circle IC1 centering on the central axis of the countershaft 30. It is formed across 79 and 79.

  Further, the 2 of the locking rib 73 along the second virtual circle IC2 passing through the tops of the two raised portions 79 formed at the end of the rim portion 71 and centering on the central axis of the countershaft 30. The length L between the tops of the two raised portions 79, 79 is set to approximately twice the width d of the locking rib 73 on the second virtual circle IC2.

  Next, the operation of this embodiment will be described. In the second speed driven gear 48, the rotation direction 76 of the countershaft 30 is provided on one of both side surfaces of the locking rib 73 facing both sides of the countershaft 30 in the circumferential direction. A flat abutting surface 75 is formed so as to face rearward along the inner side, and inner corner curved surface portions 77, 77 are formed on the both side surfaces of the locking rib 73 and the connecting portion of the boss portion 70, respectively. Outer corner curved surface portions 78 and 78 are respectively formed on the both side surfaces of the retaining rib 73 and the connecting portion of the rim portion 71, and the curvature radius RB of the outer corner curved surface portion 78 is larger than the curvature radius RA of the inner corner curved surface portion 77. Is set to be large, and the outer corner curved surface portion 78 has a protruding portion 79 protruding from the outer corner curved surface portion 78 in the circumferential direction, and both sides of the protruding portion 79 are the first curved surface 81 on the boss portion 70 side and the Re Since the second curved surface 82 on the portion 71 side is continuous with the outer corner curved surface portion 78, the stress is easily concentrated on the inner corner curved surface portion 77 on the boss portion 70 side on the rim portion 71 side. It is possible to disperse, and it is possible to balance the stress on the entire locking rib 73, and it is possible to increase the rigidity only by changing the shape.

  According to the calculation of the stress distribution acting on the locking rib 73 of the second speed driven gear 48 as described above, the result shown in FIG. Thus, it can be confirmed that the stress is dispersed throughout the locking rib 73.

  Further, since the radius of curvature R1 of the first curved surface 81 is set smaller than the radius of curvature R2 of the second curved surface 82, the stress acting on the locking rib 73 can be further distributed to the raised portion 79 side.

  A third curved surface 83 is formed on the outer peripheral surface of the boss portion 70 and the connecting portion of the annular wall portion 72, and has the same radius of curvature as the third curved surface 83 when viewed from the rotation direction 76 of the countershaft 30. Since the fourth curved surface 84 is formed in the continuous portion of the raised portion 79 and the annular wall portion 72, the continuous portion of the annular wall portion 72 on the boss portion 70 side and the raised portion 79 side of the locking rib 73. Can be made equal, and the stress acting on the locking rib 73 can be easily distributed to the raised portion 79 side.

  Further, a fifth curved surface 85 is formed on the side surface of the locking rib 73 and the continuous portion of the annular wall portion 72, and has a larger radius of curvature than the fifth curved surface 85 when viewed from the longitudinal direction of the locking rib 73. Since the sixth curved face 86 is formed in the connecting portion of the raised portion 79 and the annular wall portion 72, the sixth curved face 86 between the raised portion 79 and the annular wall portion 72 where the male fifth dog 65 does not contact is formed. The curvature radius R6 of the curved surface 86 can be made relatively large, and the rigidity of the annular wall 72 can be increased by increasing the thickness of the annular wall 72 on the side close to the outer peripheral tooth 74 where the load is applied.

  A seventh curved surface 87 having a radius of curvature larger than that of the third curved surface 83 when viewed from the rotation direction 76 of the countershaft 30 is provided on the inner peripheral surface of the rim portion 71 and the connecting portion of the annular wall portion 72. Since it is formed, the rigidity of the annular wall portion 72 can be increased by increasing the thickness of the annular wall portion 72 on the side close to the outer peripheral tooth portion 74 where the load is applied.

  Further, an eighth curved surface 88 smoothly connected to the inner peripheral surface of the rim portion 71 is connected to the front end surface of the locking rib 73 opposite to the annular wall portion 72 and the inner peripheral surface of the rim portion 71. And a stepped portion 89 formed by cutting away a part of the eighth curved surface 88 on the boss portion 70 side, the eighth curved surface is used when engaging with the fifth dog 65 while rotating relatively. It is possible to avoid the occurrence of edge contact at the end of the dog 65 to 88 and eliminate the possibility of wear due to edge contact.

  Further, the two raised portions formed at the end portion of the locking rib 73 on the rim portion 71 side, the stepped portion 89 extending along the first virtual circle IC1 centering on the central axis of the countershaft 30. 79, 79. Since the width of the locking rib 73 is increased by forming the raised portions 79, 79, the range in which the edge contact with the dog 765 may occur is long. However, the occurrence of wear can be suppressed so that the edge contact does not occur.

  Further, it passes through the tops of the two raised portions 79, 79 formed at the end of the locking rib 73 on the rim portion 71 side, and is along the second virtual circle IC 2 centering on the central axis of the countershaft 30. Since the length L between the tops of the two raised portions 79, 79 is set to approximately twice the width d of the locking rib 73 on the second virtual circle IC2, the raised portions 79, 79 are As a result, it is possible to effectively obtain a stress distribution with an appropriate width by forming the raised portions 79... While suppressing an increase in weight due to an excessive increase in the width of the locking rib 73.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

30 ... Countershaft 65 which is a rotating shaft ... Dog 70 ... Boss part 71 ... Rim part 72 ... Annular wall 73 ... Locking rib 74 ... Tooth part 75 ... · Contact surface 76 · · · rotation direction 77 · · · inner corner curved surface portion 78 · · · outer corner curved surface portion 79 · · · raised portion 81 · · · first curved surface 82 · · · second curved surface 83 · · · Third curved surface 84 ... fourth curved surface 85 ... fifth curved surface 86 ... sixth curved surface 87 ... seventh curved surface 88 ... eighth curved surface 89 ... stepped portion IC1 ... first Virtual circle IC2 ... second virtual circle

Claims (8)

  A cylindrical boss portion (70) supported by the rotating shaft (30), an annular rim portion (71) that coaxially surrounds the boss portion (70) and has a tooth portion (74) formed on the outer periphery; An annular wall portion (72) for connecting the boss portion (70) and the rim portion (71), and a rim portion (72) extending radially from the boss portion (70) and the rim portion (71). 71) integrally formed with a plurality of locking ribs (73) formed so as to increase in width toward the side and projecting from the annular wall (72) in the axial direction of the rotating shaft (30), A flat contact surface (75) that contacts a male dog (65) is formed on one of both side surfaces of the locking rib (73) facing both sides in the circumferential direction of the rotating shaft (30), and the locking rib Inner corner bends formed on both side surfaces of (73) and the continuous portion of the boss portion (70) In the dog clutch gear, the outer corner curved surface portion (78) having a larger radius of curvature than the portion (77) is formed on the both side surfaces of the locking rib (73) and the continuous portion of the rim portion (71), respectively. The outer corner curved surface portion (78) has a raised portion (79) protruding from the outer corner curved surface portion (78) in the circumferential direction, and both sides of the raised portion (79) are located on the boss portion (70) side. A dog clutch gear characterized by being formed integrally with one curved surface (81) and a second curved surface (82) on the rim portion (71) side so as to be connected to the outer corner curved surface portion (78).   The dog clutch gear according to claim 1, wherein the radius of curvature of the first curved surface (81) is set smaller than the radius of curvature of the second curved surface (82).   A third curved surface (83) is formed on the outer peripheral surface of the boss portion (70) and the continuous portion of the annular wall portion (72), and the third curved surface (83) is viewed when viewed from the rotation direction (76) of the rotation shaft (30). The fourth curved surface (84) having the same radius of curvature as that of the three curved surface (83) is formed in a continuous portion of the raised portion (79) and the annular wall portion (72). Or the gear for dog clutches of 2.   A fifth curved surface (85) is formed on the side surface of the locking rib (73) and the continuous portion of the annular wall portion (72), and the fifth curved surface when viewed from the longitudinal direction of the locking rib (73). The sixth curved surface (86) having a larger radius of curvature than (85) is formed in the connecting portion of the raised portion (79) and the annular wall portion (72). The dog clutch gear according to any one of the preceding claims.   A third curved surface (83) is formed on the outer peripheral surface of the boss portion (70) and the continuous portion of the annular wall portion (72), and the third curved surface (83) is viewed when viewed from the rotation direction (76) of the rotation shaft (30). A seventh curved surface (87) having a radius of curvature larger than the three curved surfaces (83) is formed on the inner peripheral surface of the rim portion (71) and the connecting portion of the annular wall portion (72). The gear for a dog clutch according to any one of claims 1 to 4.   On the inner peripheral surface of the rim portion (71), the front end surface of the locking rib (73) opposite to the annular wall portion (72) and the continuous portion of the inner peripheral surface of the rim portion (71) 8. An eighth curved surface (88) smoothly connected and a stepped portion (89) formed by cutting a part of the eighth curved surface (88) on the boss portion (70) side are formed. Item 6. The dog clutch gear according to any one of Items 1 to 5.   The step portion (89) extending along the first virtual circle (IC1) centering on the central axis of the rotation shaft (30) is the end portion on the rim portion (71) side of the locking rib (73). The dog clutch gear according to claim 6, wherein the dog clutch gear is formed to straddle between the two raised portions (79).   A second imaginary center passing through the tops of the two raised portions 879 formed at the end of the locking rib 73 on the rim portion 71 and centering on the central axis of the rotating shaft 30. The length between the tops of the two raised portions (79) along the circle (IC2) is set to approximately twice the width of the locking rib (73) on the second virtual circle (IC2). The dog clutch gear according to any one of claims 1 to 7, wherein the dog clutch gear is provided.

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