JP6216654B2 - Rotating shaft gear support structure - Google Patents

Description

  The present invention relates to a gear support structure for a rotary shaft that supports a plurality of parts including a gear (gear) on a rotary shaft such as a transmission, and more specifically, to a plurality of parts including a gear in their axial direction (thrust direction). ) In a state where the clearance is adjusted.

  As an automatic transmission mounted on a vehicle, a stepped automatic transmission having a plurality of rotating shafts arranged in parallel to each other and a plurality of gears and clutches (friction engagement devices) installed on these rotating shafts There is. In such an automatic transmission, for example, as described in Non-Patent Document 1, when assembling a plurality of parts including a gear on a rotating shaft, adjustment of the axial clearance (thrust clearance) of the gear and each part is performed. It is carried out. Thereby, the fall of the gear installed on the rotating shaft (in this specification, it indicates that the gear is inclined obliquely with respect to the axial direction of the rotating shaft, the same applies hereinafter) is suppressed.

  In this case, conventionally, in order to adjust the thrust clearance between a plurality of parts including gears installed at the same diameter dimension from one step portion (step surface) to another step portion on the rotating shaft, Clearance adjusting washers are interposed at a plurality of locations between the step portion and the other step portion. That is, in the example described in Non-Patent Document 1, the second-speed gear is supported in order to adjust the clearance between a plurality of parts including the third-speed gear and the second-speed gear installed within the same diameter dimension range of the counter shaft. The 26.5mm washer and the 30mm washer corresponding to the 3rd gear are installed, and the clearance is adjusted at two locations.

  However, this configuration has a problem that the number of parts of the transmission increases because thrust washers are installed at a plurality of locations and the clearance is adjusted at each of the plurality of locations. In addition, it takes time and labor to adjust the clearance, which has been a cause of hindering the efficiency of the assembly work of the transmission.

  Further, in the configuration described in Non-Patent Document 1, since the washer is only sandwiched between the gear and other parts and installed, the error range of the clearance in the axial direction (thrust direction) between the gear and other parts is compared. It was getting bigger. For this reason, the thrust clearance of the third gear is adjusted within a range of 0.015 to 0.045 mm with a 30 mm washer, but the thrust clearance of the second gear is within a range of 0.015 to 0.045 mm with a 26.5 mm washer. Therefore, as a result, there is a structural problem that the thrust clearance of the third-speed gear spreads in the range of 0.030 to 0.060 mm.

Life Service Manual CD-ROM, Honda Motor Co., Ltd. Technical Development Department Maintenance Technology Development Block, 2012.06

  The present invention has been made in view of the above points, and an object of the present invention is to provide an accurate clearance (thrust clearance) of a plurality of parts including a gear supported on a rotating shaft with a simple configuration with a reduced number of parts. It is an object of the present invention to provide a gear support structure for a rotating shaft that enables adjustment and simplification of clearance adjustment work.

  In order to solve the above-described problems, a rotating shaft gear support structure according to the present invention includes a rotating shaft (10), a first gear (20) fixed on the rotating shaft (10), and the rotating shaft (10). The second gear (30) arranged in the axial direction with the first gear (20) and the second gear (30) fixed on the rotating shaft (10) so that the second gear (30) is rotatable with respect to the rotating shaft (10). A collar member (35) to be supported, a spacer member (34) for adjusting an axial interval between the first gear (20) and the collar member (35), and a screw formed on the first gear (20) A first screw portion (36a) made of a groove and a screw thread, and a second screw portion (36b) made of a screw groove and a screw thread formed on the collar member (35) and screwed into the first screw portion (36a). An axially formed groove or protrusion formed on the rotating shaft (10) A shaft-side spline (10c), a first hole-side spline (20c) which is formed of a protrusion or groove extending in the axial direction formed in the first gear (20) and is fitted into the shaft-side spline (10c), and a color member A second hole-side spline (35c) that is formed of an axially extending projection or groove formed in (35) and fits into the shaft-side spline (10c), and includes a first gear (20) and a collar member (35 ), The axial clearance between the first gear (20) and the collar member (35) is adjusted by screwing the threaded portion (36) with the spacer member (34) sandwiched therebetween. And the projection or groove of the first hole side spline (20c) and the second hole side spline (35c) in a state where the tightening torque due to the screwing of the screwing portion (36) is within a preset range. Protrusions or grooves are in phase Characterized in that it is configured to.

  According to the gear support structure of the rotating shaft according to the present invention, the first gear and the collar member in the axial direction are screwed together by screwing the screwing portion with the spacer member sandwiched between the first gear and the collar member. The clearance is adjusted so that the first hole side spline and the second hole side spline have the same phase in a state where the tightening torque due to the screwing of the screwing portion is within a preset range. As a result, it is possible to accurately adjust the clearance between the first gear and the collar member with an extremely simple operation.

  That is, according to the present invention, the clearance between the first gear and the collar member can be accurately adjusted only by screwing the first gear and the collar member with a tightening torque within a preset range. This effectively prevents the second gear from collapsing and the backlash of the second gear on the rotating shaft or collar member, so that deterioration due to wear of the second gear or the like is suppressed, and sound generated during rotation (operating sound) ) Can be reduced. Therefore, it is possible to improve the durability of a transmission or the like provided with the gear support structure according to the present invention.

  As described above, according to the gear support structure of the present invention, since the change in the alignment of the tooth surface of the second gear is reduced due to the reduction of the tilt of the second gear, the durability of the second gear is improved, and The operation sound of the second gear can be reduced. Alternatively, since the effect of improving the durability of the second gear and reducing the operation noise can be obtained, the accuracy of the tooth profile can be suppressed slightly lower than that of the conventional structure in the production of the second gear. It is also possible to reduce the part manufacturing cost and facilitate the processing process.

  The effects of the present invention will be described in light of the prior art described in Non-Patent Document 1. The gear support structure according to the present invention is used as a clearance adjustment point for the third-speed gear on the counter shaft in Non-Patent Document 1. When applied, the thrust clearance of 0.015 to 0.045 mm, which is the original aim, can be realized at only one of the clearance adjustment points for the third gear. Therefore, in the prior art described in Non-Patent Document 1, the thrust clearance adjustment point of the second speed gear among the two thrust clearance adjustment points of the adjustment point for the second speed gear and the adjustment point for the third speed gear. Can be abolished.

  Further, according to the gear support structure of the present invention, the first hole side spline of the first gear and the second hole side spline of the collar member in a state where the tightening torque due to the screwing of the screwing portion is within a preset range. Are set so as to be in phase with each other, the first gear and the collar member in a state where the clearance adjustment has been completed can be assembled to the rotary shaft as they are by spline fitting. Then, after the first gear and the collar member are assembled to the rotating shaft, the engagement (screw engagement) between the first gear and the collar member at the threaded portion is not loosened or increased due to the spline fitting of both. There is no tightening. Therefore, it is possible to prevent the axial clearance (thrust direction) between the first gear and the collar member from changing in a state where the first gear and the collar member are assembled to the rotation shaft.

  In the gear support structure according to the present invention, the collar member (35) includes the cylindrical portion (35a) interposed between the rotary shaft (10) and the second gear (30) in the radial direction, and the cylindrical portion. A support portion (35b) that extends radially outward from (35a) and supports one end of the second gear (30) in the axial direction, and includes the first gear (20) and the second in the axial direction. A first thrust bearing (31) interposed in a gap with the gear (30), and a second thrust bearing (32) interposed between the second gear (30) and the support portion (35b) in the axial direction. It is good to have.

  According to this configuration, since the clearance between the first gear and the collar member can be accurately adjusted by screwing of the screwing portion, the axial arrangement of the second gear and the support portion of the collar member can be optimized. it can. Therefore, the fall of the second gear supported between the first gear and the support portion of the collar member can be effectively suppressed. Further, since the tilting of the transfer surfaces of the first and second thrust bearings (tilt of the transfer surfaces with respect to the axial direction) can be effectively suppressed, the durability of the first and second thrust bearings can be improved. Furthermore, since the load applied to the first and second thrust bearings can be reduced, it is possible to select a smaller-sized bearing as the first and second thrust bearings, thereby reducing the cost and weight of the transmission and the like. It becomes possible.

  Moreover, in the gear support structure concerning this invention, the small diameter part (11) formed in the rotating shaft (10), the medium diameter part (12) which has an outer diameter larger than a small diameter part (11), and a medium diameter part ( A large-diameter portion (13) having an outer diameter larger than 12), a first step portion (14) forming a boundary between the small-diameter portion (11) and the medium-diameter portion (12), and a medium-diameter portion (12 ) And a second step portion (15) that forms a boundary between the large diameter portion (13), and the first gear (20) and the collar member (35) are connected to the medium diameter portion (12). The clearance between the plurality of components arranged in the medium diameter portion (12) between the first step portion (14) and the second step portion (15) is arranged in the screwing portion (36). It may be adjusted by screwing.

  According to this configuration, between the plurality of components arranged between the first member that contacts the first step portion and the second member that contacts the second step portion by screwing the first gear and the collar member. Since the clearance can be adjusted accurately, the positional accuracy of the gear and other parts supported on the rotating shaft can be improved. In addition, in order to adjust the clearance between a plurality of components arranged between the first step portion and the second step portion, another member for adjusting the interval such as another spacer member is separately installed between the plurality of components. There is no need. Therefore, it is possible to reduce the number of parts, such as a transmission provided with the gear support structure according to the present invention, simplify the configuration, reduce the weight, and reduce the cost.

  In the above gear support structure, the spacer member (34) is an annular washer (34) disposed on the outer periphery of the rotating shaft (10), and the washer (34) is connected to the first gear (20). One washer selected from a plurality of types of thickness washers according to the set value of the clearance with the collar member (35).

According to this configuration, the first gear and the collar member are screwed with a tightening torque within a preset range with the one washer selected according to the set value of the clearance adjustment between the first gear and the collar member interposed therebetween. It is possible to accurately adjust the clearance between the first gear and the collar member only by combining them. Therefore, the clearance adjustment operation can be simplified.
In addition, the code | symbol in said parenthesis has shown the code | symbol of the corresponding component of embodiment mentioned later as an example of this invention.

  According to the gear support structure of the rotating shaft according to the present invention, it is possible to adjust the accurate clearance (thrust clearance) of the components including a plurality of gears supported on the rotating shaft with a simple configuration with a reduced number of components. At the same time, the clearance adjustment operation can be simplified.

It is a sectional side view which shows the rotating shaft (counter shaft) of a transmission provided with the gear support structure concerning one Embodiment of this invention, and the component installed on this rotating shaft. It is the elements on larger scale of the A section of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side sectional view showing a rotating shaft (counter shaft) of a transmission including a gear support structure according to an embodiment of the present invention and components installed on the rotating shaft. FIG. 2 is a partially enlarged view of a portion A in FIG. The rotating shaft shown in FIG. 1 is a counter shaft 10 provided in an automatic transmission for vehicles (hereinafter simply referred to as “transmission”). Although not shown, the transmission including the counter shaft 10 includes an input shaft and an output shaft extending in parallel with the counter shaft 10, and a stepped gear including a plurality of gears provided between the input shaft and the counter shaft 10. This is a so-called parallel shaft type transmission equipped with a transmission mechanism of the type. This transmission has a configuration in which rotation by a driving force input to an input shaft is shifted by a speed change mechanism and output to an output shaft, and is transmitted from the output shaft to a drive wheel of the vehicle via a differential mechanism.

  The above transmission is a stepped transmission of four forward speeds and one reverse speed, and the transmission mechanism includes a first-speed (LOW) gear set and a second-speed gear set that mesh with each other. It has a 3rd speed gear set, a 4th speed gear set, and a reverse gear set. The reverse gear set meshes with each other via a reverse idler gear for reversing the rotation direction. The drive side gear in each of these gear sets is disposed on the input shaft, and the driven gear is a first speed driven gear (first speed gear) 51, a second speed driven gear (second speed gear) 20, a third speed driven gear (third speed gear). ) 30, a fourth speed driven gear (fourth speed gear) 23, and a reverse driven gear (reverse gear) 26 are disposed on the counter shaft 10.

  Then, the second speed driven gear (hereinafter simply referred to as “second speed gear”) 20 and the third speed driven gear (hereinafter simply referred to as “third speed gear”) installed on the counter shaft 10 in the transmission having the above-described configuration. As a support structure for a plurality of parts including 30, the support structure for a rotating shaft according to the present invention can be used.

  As shown in FIG. 1, the counter shaft 10 includes a small-diameter portion 11 (diameter D = D1) formed on one side in the axial direction (left side in the figure) and a medium-diameter portion having a larger outer diameter than the small-diameter portion 11. 12 (diameter D = D2) and a large diameter portion 13 (diameter D = D3) having an outer diameter larger than that of the medium diameter portion 12. That is, D1 <D2D3. Further, the counter shaft 10 includes a first step portion (first step surface) 14 that forms a boundary between the small diameter portion 11 and the medium diameter portion 12, and a first step that forms a boundary between the medium diameter portion 12 and the large diameter portion 13. A two-step portion (second step surface) 15.

  The counter shaft 10 has an intermediate diameter portion 12 which includes a second gear (first gear) 20 fixed on the counter shaft 10 and a third gear (arranged in the axial direction with the second gear 20 on the counter shaft 10). (Second gear) 30, a cylindrical three-speed gear collar (color member) 35 fixed on the counter shaft 10 and rotatably supporting the third-speed gear 30 with respect to the counter shaft 10, and the second-speed gears 20 and 3 An annular thrust washer (spacer member) 34 for adjusting the axial distance from the speed gear collar 35 is provided.

  The third speed gear collar 35 includes a substantially cylindrical cylindrical portion 35a interposed between the counter shaft 10 and the third speed gear 30 in the radial direction, and an outer side in the radial direction from one axial end (right end) of the cylindrical portion 35a. And a support portion 35b extending in the direction. The support portion 35b supports one end face of the third speed gear 30 in the axial direction. A first thrust bearing 31 is interposed in the gap between the second speed gear 20 and the third speed gear 30 in the axial direction, and between the support portion 35b of the third speed gear 30 and the third speed gear collar 35 in the axial direction. The second thrust bearing 32 is interposed between the two. A radial bearing 33 is interposed in the radial gap between the outer peripheral surface of the cylindrical portion 35 a of the third speed gear collar 35 and the inner peripheral surface of the third speed gear 30. The first thrust bearing 31, the second thrust bearing 32, and the radial bearing 33 are all needle bearings. The first thrust bearing 31, the second thrust bearing 32, and the radial bearing 33 support the third speed gear 30 so as to be rotatable relative to the second speed gear 20 and the third speed gear collar 35.

  The second speed gear 20 includes a substantially cylindrical tubular portion 20 a fixed on the counter shaft 10. The cylindrical portion 20 a is disposed on the inner diameter side concentrically with the cylindrical portion 35 a of the collar member 35. And in the gear support structure of this embodiment, the screwing part 36 which screws the cylindrical part 20a of the 2nd-speed gear 20 and the cylindrical part 35a of the 3rd-speed gear collar 35 is provided. The threaded portion 36 is formed on a first threaded portion 36a formed of a screw groove and a thread provided on the outer peripheral surface of the cylindrical portion 20a of the second speed gear 20 and on an inner peripheral surface of the cylindrical portion 35a of the third speed gear collar 35. The second screw portion 36b includes a screw groove and a screw thread that are provided and screwed into the first screw portion 36a.

  A plurality of thrust washers 34 installed between the second speed gear 20 and the cylindrical portion 35a of the third speed gear collar 35 are prepared in advance according to the clearance adjustment value between the second speed gear 20 and the third speed gear collar 35. One washer selected from various types of thickness washers.

  Further, on the outer peripheral surface of the intermediate diameter portion 12 of the counter shaft 10, a shaft side spline 10 c made of a groove or protrusion extending in the axial direction is formed. On the other hand, a first hole-side spline 20c is formed on the inner peripheral surface of the cylindrical portion 20a of the second speed gear 20 and is formed of a protrusion or groove extending in the axial direction and fitted to the shaft-side spline 10c. Further, a second hole-side spline 35c is formed on the inner peripheral surface of the cylindrical portion 35a of the third-speed gear collar 35. The second hole-side spline 35c is formed of a protrusion or groove extending in the axial direction and is fitted to the shaft-side spline 10c. The second gear 20 and the third gear collar 35 are countered by spline fitting of the first and second outer peripheral side splines 20c, 35c and the inner peripheral side spline 10c in a state where the screwing portion 36 is screwed. It is fixed on the shaft 10.

  Further, as shown in FIG. 1, the small-diameter portion 11 of the counter shaft 10 has a substantially cylindrical distance collar (color member) 22 that contacts the first step portion 14 in order from the first step portion 14 side at the right end. A reverse select mechanism 8 for switching between the reverse gear 26 and the fourth speed gear 23, and a ball bearing (bearing) 27 that rotatably supports the left end of the counter shaft 10 with respect to the case 5 of the transmission; A lock nut 29 that locks the left side of the ball bearing 27 via a spring washer 28 is provided.

  The reverse select mechanism 8 includes an annular reverse gear collar installed in a radial gap between the fourth speed gear 23 adjacent to the distance collar 22, the reverse gear 26 adjacent to the ball bearing 27, and the counter shaft 10 and the reverse gear 26. 25, and a reverse selector hub 24 provided between the reverse gear 26 and the fourth speed gear 23 as well as rotatably supporting the fourth speed gear 23 with respect to the counter shaft 10.

  The lock nut 29 is fastened and fixed to the left end of the counter shaft 10, and the components (the distance collar 22, the fourth speed gear 23, the reverse selector hub 24, the reverse gear, which are arranged in the small diameter portion 11 by fastening the lock nut 29. 26, the reverse gear collar 25, the ball bearing 27, and the spring washer 28) are positioned and fixed in the thrust direction.

  Further, a substantially cylindrical second-speed gear collar 21 is installed between the second-speed gear 20 and the first step portion 14 in the intermediate diameter portion 12 of the counter shaft 10. The second speed gear collar 21 has one end face (the left end face in the figure) in contact with the distance collar 22, and the other end face (the right end face in the figure) is in contact with the side face of the second speed gear 20.

  Further, a clutch mechanism (friction engagement device) 40 for the third speed gear 30 is installed on the right side of the third speed gear collar 35 in the intermediate diameter portion 12 of the counter shaft 10. The clutch mechanism 40 includes a clutch drum 41 fixed to the counter shaft 10. The clutch drum 41 includes a small-diameter cylindrical base portion 41a fixed on the counter shaft 10, a side wall portion 41b extending radially outward from one end (right end in the figure) of the cylindrical portion 41a in the axial direction, and a side wall portion 41b. And a large-diameter cylindrical outer cylinder portion 41c that extends along the axial direction (to the left side in the figure) from the outer diameter end of the cylinder. The cylinder chamber 42 is provided inside the side wall portion 41b and the outer cylinder portion 41c, and the clutch piston 43 is fitted into the cylinder chamber 42 so as to be movable in the axial direction. A return spring 44 is disposed facing the clutch piston 43. The return spring 44 is locked at its left end to a receiving plate 45 fixed to the clutch drum 41, and presses (biases) the clutch piston 43 rightward in the drawing.

  A clutch hub 46 formed integrally with the third speed gear 30 is disposed on the inner peripheral side of the outer cylinder portion 41 c of the clutch drum 41. The clutch hub 46 is disposed adjacent to one side (right side in the figure) in the axial direction with respect to the third speed gear 30. A plurality of friction materials attached to the clutch drum 41 side and a plurality of friction materials attached to the clutch hub 46 side are alternately stacked along the axial direction at a position facing the piston portion 43a of the clutch piston 43. A frictional engagement portion 48 is provided. An end plate 47 fixed to the clutch drum 41 is installed at the end of the friction engagement portion 48 opposite to the piston portion 43a.

  A first oil passage 10f for supplying lubricating oil and a second oil passage 10g for supplying clutch operating oil are provided in the middle diameter portion 12 of the countershaft 10. Lubricating oil and clutch operating oil are supplied to the clutch mechanism 40 from the first and second oil passages 10f and 10g, respectively. The first oil passage 10 f for supplying lubricating oil communicates with the inside of the clutch drum 41 through a first passage 41 f formed in the clutch drum 41. The second oil passage 10 g for supplying the clutch hydraulic oil is connected to the cylinder chamber 42 via a second passage 41 g formed in the clutch drum 41.

  When the clutch hydraulic oil is supplied to the cylinder chamber 42 through the second oil passage 10g and the second passage 41g, the clutch piston 43 resists the urging force of the return spring 44 by the hydraulic pressure of the hydraulic oil and moves to the left in FIG. Pressed. Thereby, the piston portion 43 a presses the friction engagement portion 48 against the end plate 47. As a result, the friction material of the friction engagement portion 48 is engaged, and the clutch hub 46 and the third speed gear 30 rotate integrally with the clutch drum 41. In this way, power transmission by the third speed gear 30 is performed, and the third speed stage of the transmission is set.

  The third speed gear 30 engaged and disengaged by the clutch mechanism 40 in this manner is rotatably held on the third speed gear collar 35 by the radial bearing 33, and is supported by the first and second thrust bearings 31 and 32 on both sides in the axial direction. Positioning in the thrust direction is made. Here, the first thrust bearing 31 is positioned in contact with the side surface (the right side surface in the drawing) of the second speed gear 20 fixed to the counter shaft 10, and the second thrust bearing 32 is positioned on the third speed gear collar 35. The support portion 35b is positioned in contact with the side surface (the left side surface in the figure).

  A thrust washer 49, a first speed gear 51, and a parking gear 52 are installed between the clutch mechanism 40 and the second step portion 15 in the middle diameter portion 12 of the counter shaft 10 in this order from the clutch mechanism 40 side. . The parking gear 52 has a substantially cylindrical tubular portion 52 a fixed on the counter shaft 10. One end surface (the right end surface in the drawing) of the cylindrical portion 52 a is in contact with the second step portion 15, and the other end surface (the left end surface in the drawing) is in contact with the thrust washer 49. The first speed gear 51 is installed on the outer peripheral side of the cylindrical portion 52 a of the parking gear 52 via a radial bearing 53 so as to be relatively rotatable. The thrust washer 49 interposed between the clutch drum 41 and the first speed gear 51 of the clutch mechanism 40 is a spline washer fixed on the counter shaft 10 by spline fitting.

  A final drive gear 16 is formed on the large diameter portion 13 of the counter shaft 10. The final drive gear 16 meshes with a differential gear (final driven gear) (not shown) provided in the differential mechanism of the transmission.

  In the gear support structure of the present embodiment, the screwing portion 36 is screwed in a state in which one pre-selected thrust washer 34 is sandwiched between the second speed gear 20 and the cylindrical portion 35a of the third speed gear collar 35. By doing so, the clearance between the second speed gear 20 and the third speed gear collar 35 in the axial direction is adjusted. At this time, the projection or groove of the first hole side spline 20c of the second speed gear 20 and the second hole side of the third speed gear collar 35 in a state where the tightening torque due to the screwing of the screwing portion 36 is within a preset range. The protrusions or grooves of the spline 35c are set so as to have the same phase (same position in the circumferential direction).

  The 2nd speed gear 20 and the 3rd speed gear collar 35 are disposed on the intermediate diameter portion 12 of the counter shaft 10 and are arranged on the intermediate diameter portion 12 from the second step portion 15 to the first step portion 14 (distance collar 22). A plurality of installed parts (the parking gear 52 and the first speed gear 51, the thrust washer 49, the clutch mechanism 40 (clutch drum 41), the second speed gear 20 and the third speed gear collar 35, the respective parts of the second speed gear collar 21, and so on). Is adjusted by screwing the second gear 20 and the third gear collar 35 to each other.

  As described above, according to the gear support structure of the counter shaft 10 of the present embodiment, the screwing portion 36 is screwed in a state where the pre-selected thrust washer 34 is sandwiched between the second speed gear 20 and the third speed gear collar 35. By combining, the clearance between the second speed gear 20 and the third speed gear collar 35 in the axial direction is adjusted. The first hole side spline 20c provided in the second speed gear 20 and the second hole side spline 35c provided in the third speed gear collar 35 in a state where the tightening torque due to the screwing of the screwing portion 36 is within a preset range. Are set to have the same phase. Thus, the clearance adjustment between the second speed gear 20 and the third speed gear collar 35 can be accurately performed with extremely simple work.

  That is, in the gear support structure of the present embodiment, the clearance between the second speed gear 20 and the third speed gear collar 35 can be achieved by simply screwing the second speed gear 20 and the third speed gear collar 35 with a tightening torque within a preset range. Can be adjusted accurately. As a result, it is possible to effectively prevent the third speed gear 30 from falling over and the backlash of the third speed gear 30 on the counter shaft 10 or the third speed gear collar 35. It is possible to reduce the generated sound (operation sound). Therefore, it is possible to improve the durability of the transmission including the gear support structure of the present embodiment.

  As described above, according to the gear support structure of the present embodiment, the change in the alignment of the tooth surface of the third speed gear 30 is reduced due to the reduction of the tilt of the third speed gear 30, so that the durability of the third speed gear 30 is improved. Improvement and reduction of the operation sound of the 3rd speed gear 30 can be aimed at. Alternatively, since the durability of the third speed gear 30 can be improved and the operation noise can be reduced, the tooth profile accuracy in manufacturing the third speed gear 30 can be slightly lower than that of the conventional structure. Therefore, it is possible to reduce the manufacturing cost of parts and facilitate the processing process.

  Further, according to the gear support structure of the present embodiment, the clearance between the second speed gear 20 and the third speed gear collar 35 can be accurately adjusted by screwing of the screwing portion 36, so that the second speed gear 20 and the third speed gear collar 35 can be adjusted. The axial arrangement with the support portion 35b can be optimized. Therefore, it is possible to effectively suppress the falling of the third speed gear 30 supported between the second speed gear 20 and the support portion 35b of the third speed gear collar 35. Moreover, since the fall of the transfer surface of the first and second thrust bearings 31 and 32 (inclination of the transfer surface with respect to the axial direction) can be effectively suppressed, the durability of the first and second thrust bearings 31 and 32 can be improved. Can be planned. Furthermore, since the load applied to the first and second thrust bearings 31 and 32 can be reduced, it is possible to select a smaller-sized bearing as the first and second thrust bearings 31 and 32. Cost and weight can be reduced.

  Further, according to the gear support structure of the present embodiment, the distance collar (first member) 22 and the second step portion 15 that are in contact with the first step portion 14 by screwing between the second speed gear 20 and the third speed gear collar 35. Since the clearance between a plurality of components disposed between the parking gear 52 and the parking gear 52 can be accurately adjusted, it is possible to improve the positional accuracy of the gear and other components supported on the intermediate diameter portion 12 of the counter shaft 10. it can. In addition, in order to adjust the clearance between a plurality of components arranged in the middle diameter portion 12 from the first step portion 14 to the second step portion 15, adjustment of the interval such as another washer (spacer member) between the plurality of components. There is no need to install a separate member. Therefore, it is possible to reduce the number of parts of the transmission including the gear support structure according to the present embodiment, simplify the configuration, reduce the weight, and reduce the cost.

  The effect of the gear support structure of the present embodiment will be described in light of the prior art described in Non-Patent Document 1. If the gear support structure of the present embodiment is used, one of the clearance adjustment points for the third-speed gear 30 will be described. The thrust clearance of 0.015 to 0.045 mm, which is the original aim, can be realized only at the locations. Therefore, in the prior art described in Non-Patent Document 1, the thrust clearance adjustment for the second speed gear among the two thrust clearance adjustment positions, that is, the adjustment position for the second speed gear and the adjustment position for the third speed gear. The place can be abolished.

  In the present embodiment, the first hole side spline 20c and the second hole side spline 35c are set to be in phase with each other in a state where the tightening torque due to the screwing of the screwing portion 36 is within a preset range. Thus, the second speed gear 20 and the third speed gear collar 35 in the state where the clearance adjustment is completed can be assembled to the counter shaft 10 by spline fitting as they are. After the second-speed gear 20 and the third-speed gear collar 35 are assembled to the counter shaft 10, the two-speed gear 20 and the third-speed gear collar 35 are screwed together (screw connection) by spline fitting of both. Is not loosened or tightened. Therefore, it is possible to prevent the axial clearance (thrust direction) between the second speed gear 20 and the third speed gear collar 35 from changing in a state where the second speed gear 20 and the third speed gear collar 35 are assembled to the counter shaft 10.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. For example, in the above-described embodiment, the example in which the gear support structure of the rotating shaft according to the present invention is applied to the gear support structure that supports the third-speed gear on the counter shaft included in the parallel shaft type automatic transmission has been shown. The rotating shaft to which the gear support structure according to the invention is applied may be another rotating shaft of the transmission, or may be a structure that supports another gear. Moreover, you may apply to the support structure which supports a gear on the rotating shaft with which driving force transmission devices other than a transmission are provided.

5 Case 8 Reverse select mechanism 10 Counter shaft (rotating shaft)
10c Shaft side spline 11 Small diameter portion 12 Medium diameter portion 13 Large diameter portion 14 First step portion 15 Second step portion 16 Final drive gear 20 Second speed gear (first gear)
20c 1st hole side spline 21 2nd gear collar 22 Distance collar 23 4th gear 24 Reverse selector hub 25 Reverse gear collar 26 Reverse gear 27 Ball bearing 28 Spring washer 29 Lock nut 30 3rd gear (second gear)
31 First thrust bearing 32 Second thrust bearing 33 Radial bearing 34 Thrust washer (spacer member)
35 3-speed gear collar (color member)
35a Tubular portion 35b Support portion 35c Second hole side spline 36 Threaded portion 36a First screw portion 36b Second screw portion 40 Clutch mechanism 41 Clutch drum 42 Cylinder chamber 43 Clutch piston 43a Piston portion 44 Return spring 45 Receiving plate 46 Clutch hub 47 End plate 48 Friction engagement part 49 Thrust washer 51 First gear 52 Parking gear

Claims (4)

A rotation axis;
A first gear fixed on the rotating shaft;
A second gear arranged in an axial direction with the first gear on the rotating shaft;
A collar member fixed on the rotating shaft and rotatably supporting the second gear with respect to the rotating shaft;
A spacer member for adjusting an axial interval between the first gear and the collar member;
A first screw portion formed of a screw groove and a screw thread formed in the first gear; and a second screw portion formed of the collar member and screwed into the first screw portion and formed of a screw groove and a screw thread. A threaded portion,
An axial spline formed of an axially extending groove or protrusion formed on the rotating shaft;
A first hole-side spline comprising a protrusion or groove extending in the axial direction formed on the first gear and fitted to the shaft-side spline;
A second hole side spline formed of a protrusion or groove extending in the axial direction formed on the collar member and fitted to the shaft side spline,
The axial clearance adjustment between the first gear and the collar member is performed by screwing the screwing portion with the spacer member sandwiched between the first gear and the collar member. With composition
The protrusion or groove of the first hole side spline and the protrusion or groove of the second hole side spline are in phase with each other in a state where the tightening torque due to the screwing of the screw part is within a preset range. A rotary shaft gear support structure characterized by being set. The collar member includes a cylindrical portion interposed between the rotary shaft in the radial direction and the second gear, and one end of the second gear in the axial direction extending from the cylindrical portion to the outside in the radial direction. A support part for supporting the part,
A first thrust bearing interposed in a gap between the first gear and the second gear in the axial direction; and a second thrust bearing interposed between the second gear in the axial direction and the support portion. The gear support structure for a rotating shaft according to claim 1. A small diameter portion formed on the rotating shaft;
A medium diameter portion having an outer diameter larger than the small diameter portion;
A large diameter portion having an outer diameter larger than the medium diameter portion;
A first step portion forming a boundary between the small diameter portion and the medium diameter portion;
A second step portion that forms a boundary between the medium diameter portion and the large diameter portion,
The first gear and the collar member are disposed in the medium diameter portion,
The clearance between a plurality of components arranged in the medium diameter portion between the first step portion and the second step portion is adjusted by screwing of the screwing portion. The gear support structure of the rotating shaft according to 2. The spacer member is an annular washer arranged on the outer periphery of the rotating shaft,
4. The washer according to claim 1, wherein the washer is one washer selected from a plurality of types of thickness washer according to a set value of a clearance between the first gear and the collar member. A gear support structure for a rotating shaft according to claim 1.

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