JP2013113305A - Lubricating oil supply structure of gearbox - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricating oil supply structure of a gearbox with which the quantity of lubricating oil in a rotary shaft can be increased by suppressing a little the quantity of lubricating oil leaked from a terminal part of a lubricating oil supply hole, in simple configuration suppressing the number of components a little.SOLUTION: A lubricating oil supply structure includes: a hollow lubricating oil supply hole 71 extending inside an output shaft 12 in an axial direction; a bolt 75 for mounting a bearing 73 in a terminal part of the output shaft 12; and a guide plate 77 for supplying from an opening 72 to the lubricating oil supply hole 71 lubricating oil introduced from a lubricating oil introduction path 33 disposed along an inner surface 5a of a case 5. A pipe part 79 of the guide plate 77 is disposed within a hollow part 75c of the bolt 75 as a whole, and a distal end 79a of the pipe part 79 is positioned closer to the terminal part 12a of the output shaft 12 than a distal end of a shaft part 75b.

Description

  The present invention relates to a lubricating oil supply structure for a transmission configured to supply lubricating oil to a lubricating oil supply hole of a rotary shaft from a lubricating oil introduction path disposed in a case of the transmission.

  Conventionally, in various transmissions including a manual transmission (MT), lubricating oil in a case is supplied to bearings, gears, and the like that support a rotating shaft. As such a lubricating oil supply structure, for example, as shown in Patent Document 1, there is a structure in which lubricating oil is supplied to a lubricating oil supply hole in a rotary shaft from a lubricating oil introduction path arranged on the inner surface side of the case. In this structure, a guide member (guide plate) is provided between the opening at the shaft end and the inner surface of the case to guide the lubricant introduced from the lubricant introduction passage to the lubricant supply hole. The guide member includes a plate-like plate portion interposed between the inner surface of the case and the shaft end of the rotating shaft, and a cylindrical pipe portion protruding from the center of the plate portion and inserted into the end opening of the rotating shaft. Become. Then, the lubricating oil introduced into the lubricating oil supply hole of the rotating shaft through the pipe portion of the guide member passes through a supply port formed in the lubricating oil supply hole to be lubricated by a gear bearing portion on the rotating shaft, a synchromesh mechanism, or the like. To be supplied.

  Incidentally, since the rotation shaft of the transmission rotates at a high speed, a certain clearance is provided between the outer peripheral surface of the pipe portion of the guide member and the inner peripheral surface of the opening portion of the lubricating oil supply hole. Therefore, a part of the lubricating oil supplied to the lubricating oil supply hole leaks out from the opening end of the rotating shaft through this clearance, and there is a problem that the amount of lubricating oil supplied to the lubricated part decreases. is there.

  Therefore, a plug member (oil pass plug) having a small-diameter hole is fitted to the opening end of the lubricating oil supply hole, and the pipe portion of the guide member is projected through the small-diameter hole of the plug member to enter the lubricating oil supply hole. There is a structure to supply lubricating oil. In this structure, the amount of leakage of the lubricating oil can be reduced by blocking the lubricating oil in the lubricating oil supply hole with the plug member.

  However, in the structure using the plug member described above, it is necessary to provide the plug member as a separate part, and a process of pressing the plug member into the end of the rotating shaft and assembling it is necessary. Therefore, there is a problem that the number of parts and the manufacturing cost of the transmission are increased. Further, the plug member press-fitted into the opening end of the lubricating oil supply hole may be detached from the opening end by receiving a radial load from the bearing when the rotating shaft rotates.

  Further, in the transmission having the lubricating oil supply structure as described above, the bearing that supports the rotating shaft is locked in the case by an annular locking member made of an elastic metal such as a circlip. An adjustment hole for attaching and removing the circlip is provided in the case, and the diameter of the circlip is adjusted from the outside of the case through the adjustment hole, so that the bearing is locked in the case. It is configured as follows.

  However, when the guide member is provided, if the diameter of the plate portion of the guide member is large, the end portion of the circlip is hidden by the outer peripheral edge of the plate portion, and the end portion of the circlip is adjusted from the adjustment hole. May be difficult to perform. In this regard, if the diameter of the plate portion is smaller than the outer diameter of the bearing, the end portion of the circlip does not need to be hidden by the plate portion. However, the plate portion of the guide member is a portion that divides the lubricating oil introduction path between the inner surface of the case. Therefore, it is necessary to extend the outer diameter end of the plate portion to the lower end portion of the lubricating oil introduction passage so that the lubricating oil can be stored in the lubricating oil introduction passage, and it is difficult to reduce the diameter of the plate portion.

JP 2010-91000 A

  The present invention has been made in view of the above points, and its object is to reduce the amount of lubricating oil leaked from the gap between the guide member and the lubricating oil supply hole of the rotating shaft with a simple configuration with a reduced number of parts. Provided is a lubricating oil supply structure for a transmission that can increase the amount of lubricating oil in the rotating shaft by reducing the amount of rotation and can facilitate the work of assembling the guide member and the bearing in the case. There is.

  In order to solve the above-described problems, a lubricating oil supply structure for a transmission according to the present invention includes a case (5) of the transmission (1), and an end (12a) of the case (5) having a bearing (73). And a hollow lubricating oil supply hole (71) extending in the axial direction in the rotating shaft (12) from an opening (72) provided at the end (12a). The supply port (71a) that opens to the outer peripheral surface of the rotary shaft (12) from the lubricating oil supply hole (71) toward the outside in the radial direction and the opening (72) are fastened to the rotary shaft (12). The fastener (75) for attaching the bearing (73) to the end portion (12a) of the screw and the lubricating oil introduced from the lubricating oil introduction passage (33) disposed along the inner surface (5a) of the case (5) are opened. A guide member (77) for supplying the lubricating oil supply hole (71) from (72), and a fastener (75 Are a head (75a) for locking the bearing (73), a shaft (75b) screwed into the opening (72) of the rotating shaft (12), a head (75a) and a shaft (75b). The guide member (77) includes an inner surface (5a) of the case (5) and an end of the rotating shaft (12) ( 12a) and a plate-like plate part (78) installed between the bearing (73) and a cylindrical pipe part (79) formed integrally with the plate part (78). The part (79) is disposed in the hollow part (75c) of the fastener (75), and the tip (79a) of the pipe part (79) is a rotational axis more than the tip (75d) of the shaft part (75b). It is located on the side close to the end (12a) of (12).

  According to the lubricating oil supply structure of the present invention, the fastener for attaching the bearing to the end portion of the rotating shaft is provided, and the pipe portion of the guide member is disposed in the hollow portion of the fastener. Thus, it is possible to effectively prevent the lubricating oil in the lubricating oil supply hole from leaking from the gap between the pipe portion and the opening of the rotating shaft. That is, in this lubricating oil supply structure, a fastener for attaching a bearing is used as a component for preventing the lubricating oil supplied from the pipe portion of the guide member to the lubricating oil supply hole of the rotating shaft from leaking from the opening. I am doing so.

  In the conventional lubricating oil supply structure, in order to prevent the lubricating oil supplied from the pipe portion of the guide member to the lubricating oil supply hole of the rotating shaft from leaking from the opening end, the lubricating oil supply hole is formed in the opening portion of the rotating shaft. In the above-described lubricating oil supply structure according to the present invention, a lubricating oil supply hole is provided using a fastener for attaching a bearing to the end of the rotary shaft. It is possible to block the lubricating oil flowing out from the opening through the opening. Therefore, by using the above fastener as a substitute for the plug member, it is possible to suppress the leakage of the lubricating oil from the lubricating oil supply hole while reducing the number of parts of the transmission and simplifying the assembly process. It becomes possible. Further, since the plug member attached to the end portion of the rotating shaft is not necessary, there is no problem that the plug member is detached and detached from the end portion of the rotating shaft.

  In the lubricating oil supply structure according to the present invention, as described above, the pipe portion of the guide member is disposed in the hollow portion of the fastener, and the tip of the pipe portion rotates more than the tip of the shaft portion of the fastener. By being positioned on the side closer to the end of the shaft, the length dimension of the pipe portion is optimized. Thereby, it is possible to secure a sufficient flow rate of the lubricating oil supplied to the lubricating oil supply hole. That is, for example, if it is configured such that the tip of the pipe portion is located on the side farther from the end of the rotating shaft than the tip of the shaft portion, the pressure of the lubricating oil supplied due to the pipe portion being too long is reduced. There is a risk that the lubricating oil led out from the tip of the pipe portion leaks to the opening side of the rotating shaft along the outer peripheral surface of the pipe portion.

  In this case, the inner diameter dimension of the hollow part (75c) of the fastener (75) is set to be smaller than the inner diameter dimension of the lubricating oil supply hole (71), and the hollow part (75c) and the lubricating oil supply hole ( 71) may be formed at the boundary with 71). According to this configuration, the lubricating oil in the lubricating oil supply hole can be blocked by the fastener. Therefore, it is possible to effectively suppress the lubricating oil in the lubricating oil supply hole from leaking from the end of the rotating shaft. Thereby, the function as a substitute of the plug member by a fastener can be more effectively exhibited.

  In this lubricating oil supply structure, the other end (12b) of the rotating shaft (12) is rotatably supported via another bearing (83), and the lubricating oil is supplied to the rotating shaft (12). The hole (71) is provided with a plug member (85) for blocking the lubricating oil flowing in the lubricating oil supply hole (71) toward the other end (12b) side. The plug member (85) It is good to install inside the other bearing (83) in the axial direction of a rotating shaft (12).

  According to this configuration, by installing the plug member, it is possible to prevent the lubricating oil in the lubricating oil supply hole from excessively leaking from the other end of the rotating shaft. In addition, since the plug member is installed on the inner side of the other bearing in the axial direction of the rotary shaft, the plug member comes out of the end of the lubricating oil supply hole even when a radial load is applied to the plug member from the bearing. Can be prevented. That is, if the plug member is installed at the same position as the bearing in the axial direction or outside the center of the bearing, a radial load is applied from the bearing to the plug member, so that the plug member becomes the lubricating oil supply hole. There is a risk of being pushed out to the end portion side and coming off from the end portion and coming off. In contrast, if the plug member is installed on the inner side of the bearing as described above, even if a radial load is applied to the plug member from the bearing, the plug member is removed from the end of the lubricating oil supply hole. There is no fear of coming off.

  Further, in this case, a plurality of gears including a gear (60) fixed to the rotary shaft (12) and having a driving force transmitted through the rotary shaft (12) constantly act on the rotary shaft (12). The plug member (85) may be installed at an intermediate position in the axial direction of the gear (60).

  According to this configuration, since the plug member is installed at an intermediate position in the axial direction of the gear on which the driving force transmitted through the rotating shaft is always applied, the radial load applied from the gear to the plug member. Thus, the plug member can be prevented from being pushed out in the axial direction. Therefore, it is possible to prevent the plug member from being installed in the lubricating oil supply hole and maintain the function of the plug member.

  In the lubricating oil supply structure, the inner surface (5a) of the case (5) has a recess (31) that houses the guide member (77) and the bearing (73), and an inner peripheral surface of the recess (31) ( An annular groove (32) formed in 31b), provided with a locking tool (74) which is attached to the annular groove (32) and fixes the bearing (73) in the recess (31). The tool (74) is made of an elastic wire formed by annularly bending between both ends (74a, 74a), and the diameter can be adjusted by the separation dimension of both ends (74a, 74a). (5) is provided with an adjustment hole (35) capable of adjusting the diameter of the locking tool (74) attached to the annular groove (32) from the outside of the case (5). ) On the outer peripheral edge (78c) of the plate portion (78). Characterized in that the parts (74a, 74a) notch for exposing the adjustment hole (35) to (78d) are formed.

  According to this configuration, the notch portion for exposing both end portions of the locking tool is formed on the outer peripheral edge of the plate portion of the guide member, so that the case is installed in the recess portion of the case. It becomes possible to adjust the separation dimension of the both ends of the locking tool from the outside. Thereby, the work which fixes the bearing which supports the edge part of a rotating shaft can be facilitated. In addition, since the work of removing the bearing fixed in the case can be easily performed, the maintenance efficiency of the transmission can be improved. In addition, since the above-described notch is formed on the outer peripheral edge of the plate portion of the guide member, the diameter of the plate portion itself can be set to be the same as or larger than that of the bearing. Accordingly, since the other outer peripheral edge of the plate portion can be configured to extend to the lower end portion of the lubricating oil introduction passage disposed along the inner surface of the case, the lubricating oil in the lubricating oil introduction passage can be held by the plate portion. In addition, it is possible to facilitate the operation of adjusting both ends of the locking tool from the adjustment hole through the notch.

  Further, in the above lubricating oil supply structure, projecting portions (78e, 78e) projecting outward in the radial direction are formed on the side portion of the notch portion (78d) in the outer peripheral edge (78c) of the plate portion (78). The projections (78e, 78e) are locked to the stepped portions (37, 37) formed on the inner surface (5a) of the case (5), thereby preventing the plate portion (78) from rotating. You may comprise.

According to this configuration, the notch portion of the plate portion is aligned with the adjustment hole of the case only by installing the plate portion in the concave portion of the case. Therefore, it is possible to improve the efficiency of the work of assembling the guide member and the work of fixing the bearing by adjusting both ends of the locking tool. Further, since the rotation of the plate portion can be prevented even after the transmission is assembled, the notch portion of the plate portion is aligned with the adjustment hole of the case during maintenance.
In addition, the code | symbol in said parenthesis shows the code | symbol of the component in embodiment mentioned later as an example of this invention.

  According to the lubricating oil supply structure for a transmission according to the present invention, the amount of lubricating oil in the rotating shaft can be increased with a simple configuration with a reduced number of parts, and a guide member and a bearing are provided in the case. The assembly work can be facilitated.

1 is a longitudinal sectional view of a manual transmission which is an embodiment of a transmission to which a lubricating oil supply structure according to the present invention can be applied. It is a partial expanded sectional view which shows the edge part and its vicinity of an output shaft, and is sectional drawing of the part corresponding to the YY arrow of FIG. It is sectional drawing of the part corresponding to the ZZ arrow of FIG. It is a figure which shows the inner surface of the case which opposes the edge part of an output shaft, and is a figure corresponding to the XX arrow of FIG. It is the perspective view which looked at the inside of an adjustment hole from the outside of a case. It is a graph which shows the relationship between the setting of the length dimension of a pipe part, and the flow volume of the lubricating oil in a lubricating oil supply hole. It is the elements on larger scale which show an output shaft and its surrounding component parts.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a main sectional view of a manual transmission (manual transmission) according to an embodiment of a transmission according to the present invention. A manual transmission (hereinafter referred to as a “transmission”) 1 shown in FIG. 1 is a transmission mounted on a vehicle, and shifts driving force from an engine (not shown) to drive wheels (not shown). )). The transmission 1 is fixed to the case 5 and an input shaft (main shaft) 10 and an output shaft (counter shaft) 12 that are rotatably supported in a transmission case (hereinafter simply referred to as “case”) 5. And a reverse shaft (idle shaft) 14. The input shaft 10, the output shaft 12, and the reverse shaft 14 are arranged in parallel with each other at a predetermined interval. A clutch mechanism 8 housed in the clutch case 7 is provided between the input shaft 10 and the crankshaft 11. Since the clutch mechanism 8 is a known mechanism, a detailed description thereof is omitted here. In the following description, the axial direction indicates the axial direction of the input shaft 10 and the output shaft 12, and the horizontal direction indicates the left-right direction (width direction) with respect to the axial direction. Further, the term “up” or “down” refers to “up” or “down” in a state where the transmission 1 is mounted on a vehicle.

  A first speed drive gear 40 and a second speed drive gear 41 are fixed to the input shaft 10, and a third speed drive gear 42, a fourth speed drive gear 43, a fifth speed drive gear 44 and a sixth speed drive gear 45 are relative to each other. It is supported rotatably. On the other hand, a first-speed driven gear 46 and a second-speed driven gear 47 that mesh with the first-speed drive gear 40 and the second-speed drive gear 41, respectively, are supported on the output shaft 12 so as to be relatively rotatable, and the third-speed drive gears 42, 4 A 3-speed driven gear 48, a 4-speed driven gear 49, a 5-speed driven gear 50, and a 6-speed driven gear 51 that mesh with the high-speed drive gear 43, the 5-speed drive gear 44, and the 6-speed drive gear 45 are fixed. The 1st to 6th drive gears 40 to 45 and the 1st to 6th driven gears 46 to 51 constitute a gear train 55 provided between the input shaft 10 and the output shaft 12.

  In addition, a 1-2 speed synchronizer 52, a 3-4 speed synchronizer 53, and a 5-6 speed synchronizer 54 are provided for switching each transmission gear stage. The 1-2 speed synchronizer 52 is provided between the first speed driven gear 46 and the second speed driven gear 47 on the output shaft 12. The 3-4 speed synchronizer 53 is provided between the 3rd speed drive gear 42 and the 4th speed drive gear 43 on the input shaft 10. The 5-6 speed synchronizer 54 is provided between the 5th speed drive gear 44 and the 6th speed drive gear 45 on the input shaft 10.

  The reverse gear setting mechanism 20 includes a reverse output gear 17 fixed on the output shaft 12, a first idle gear 18 that is installed on the reverse shaft 14 and constantly meshes with the first speed drive gear 40, and the reverse shaft 14. And a second idle gear 19 that is installed on the upper side and always meshes with the reverse output gear 17. Further, the reverse gear setting mechanism 20 includes a synchronizing device 25 for establishing the reverse gear disposed between the first idle gear 18 and the second idle gear 19 on the reverse shaft 14.

  The power of the input shaft 10 is transmitted to the output shaft 12 through the selected transmission gear stage by the operation of each of the synchronizers (synchromesh mechanisms) 52, 53, and 54. Then, after being decelerated by a final reduction mechanism composed of a final drive gear 60 and a final driven gear 61, it is transmitted to the differential device 62. Thereby, the drive shafts 63 and 64 connected to the left and right axles rotate in the forward direction.

  Further, when the reverse gear is set, the first idle gear 18 and the second idle gear 19 on the reverse shaft 14 are synchronously coupled by the synchronizer 25 for establishing the reverse gear. As a result, the power of the input shaft 10 is transmitted to the reverse shaft 14 via the first speed drive gear 40 and the first idle gear 18, and further to the output shaft 12 via the second idle gear 19 and the reverse output gear 17. Communicated. As a result, the output shaft 12 rotates in the opposite direction to that when the forward gear is set. Therefore, the drive shafts 63 and 64 are rotated in the reverse direction by the driving force transmitted from the output shaft 12 to the differential device 62.

  The transmission 1 configured as described above is provided with a lubricating oil supply structure that supplies lubricating oil from the lubricating oil introduction passage 33 disposed in the case 5 to the lubricating oil supply hole 71 of the output shaft 12. Hereinafter, this lubricating oil supply structure will be described in detail. 2 and 3 are partially enlarged views showing the end portion 12a of the output shaft 12 and the vicinity thereof, and FIG. 2 is a cross-sectional view of a portion corresponding to a YY arrow view of FIG. These are sectional drawings of the part corresponding to the ZZ arrow of FIG. FIG. 4 is a view showing the inner surface of the case 5 facing the end 12a of the output shaft 12, and is a view showing a portion corresponding to the XX arrow in FIG. In FIG. 4, a circlip 74 on the front side of a plate portion 78 of a guide member 77 described later is illustrated by a dotted line.

  As shown in FIG. 1, a hollow lubricating oil supply hole 71 extending in the axial direction is formed inside the output shaft 12, and is orthogonal to the lubricating oil supply hole 71 on the outer periphery of the output shaft 12. A plurality of supply ports 71 a penetrating each of the driven gears 46 to 51 and the inner diameter side of the 1-2 speed synchronizer 52 are formed.

As shown in FIGS. 2 to 4, the inner surface 5 a of the case 5 that faces the end 12 a of the output shaft 12 has a recess 31 that accommodates a guide plate 77 and a bearing 73 attached to the end 12 a of the output shaft 12. Is formed. The recess 31 is a substantially circular depression having an inner peripheral diameter that substantially matches the outer peripheral diameter of the bearing 73.
Further, in the gap between the bottom surface (axial end surface) 31 a of the recess 31 and the plate portion 78 of the guide plate 77, there is a lubricating oil introduction path 33 for introducing the lubricating oil into the lubricating oil supply hole 71 of the output shaft 12. It is defined.
As shown in FIG. 4, an oil passage groove 34 is formed above the lubricating oil introduction passage 33 to supply the lubricating oil to the lubricating oil introduction passage 33. Lubricating oil in the case 5 scraped up by the final driven gear 61 is supplied to the oil passage groove 34 through an oil gutter plate (not shown). The oil passage groove 34 allows the lubricating oil to flow down to the lubricating oil introduction passage 33 via an adjustment hole 35 described later.

  A narrow strip-like annular groove 32 is formed on the inner peripheral surface 31b of the recess 31 over the entire periphery. A circlip (locking tool) 74 for positioning and fixing the bearing 73 accommodated in the recess 31 is attached to the annular groove 32. The circlip 74 is made of a metal wire having elasticity, and is a part that is formed in a substantially C shape by annularly bending between both end portions 74a and 74a. The diameter of the circlip 74 can be adjusted according to the distance between the end portions 74a and 74a. Therefore, the diameter dimension can be enlarged by moving the end portions 74a and 74a in the direction of separating them. On the other hand, when the force separating both ends is released, the original diameter is restored elastically. The circlip 74 installed in the annular groove 32 has its inner peripheral edge slightly protruded inward from the annular groove 32 in a state where no external force is applied, while the both ends 74a and 74a are pushed and expanded. The entire shape is set to be accommodated in the annular groove 32.

  Further, an opening 72 connected to the lubricating oil supply hole 71 is formed at the end 12 a of the output shaft 12. The inner diameter of the opening 72 is smaller than the inner diameter of the lubricating oil supply hole 71. A bolt (fastener) 75 for locking the inner ring 73 b of the bearing 73 attached to the end 12 a of the output shaft 12 is fastened to the opening 72. The bolt 75 includes a head 75a that contacts and locks the inner ring 73b of the bearing 73 at the end 12a of the output shaft 12, a shaft 75b that is screwed into the opening 72, a head 75a, and a shaft 75b. And a hollow portion 75c made of a through hole extending in the axial direction. A screw groove is formed on the outer peripheral surface of the shaft portion 75 b, and the screw groove is screwed into a screw groove formed on the inner peripheral surface of the opening 72. The hollow portion 75c has a hexagonal cross-sectional shape on the inner peripheral surface, and a bolt 75 is inserted into the opening 72 by inserting and rotating a hexagonal tool (not shown) into the hollow portion 75c. It comes to conclude. As a result, the inner ring 73 b of the bearing 73 is fixed to the end 12 a of the output shaft 12.

  Further, the inner diameter dimension of the hollow portion 75 c of the bolt 75 is set to be smaller than the inner diameter dimension of the lubricating oil supply hole 71. Thereby, a stepped portion 76 is formed at the boundary between the lubricating oil supply hole 71 and the hollow portion 75 c of the bolt 75. The lower surface of the hollow portion 75 c is higher than the lower surface of the lubricating oil supply hole 71.

  Lubricating oil introduced from the lubricating oil introduction passage 33 is interposed between the bottom surface 31a (the inner surface 5a of the case 5) in the recess 31 and the bearing 73 and the end 12a of the output shaft 12 (head 75a of the bolt 75). A guide plate (guide member) 77 for supplying the lubricating oil supply hole 71 from the opening 72 of the output shaft 12 is installed. The guide plate 77 includes a flat plate portion 78 disposed between the bottom surface 31a in the recess 31 and the end portion 12a of the output shaft 12 and the bearing 73, and one surface of the plate portion 78 (on the output shaft 12 side). And a cylindrical pipe portion 79 projecting from the center of the surface. A circular opening 78 a communicating with the pipe portion 79 is formed at the center of the plate portion 78. On the outer diameter side of the pipe portion 79 in the plate portion 78, a plurality of small holes 78b penetrating the plate portion 78 are formed radially. The outer peripheral edge 78c of the plate portion 78 has a circular shape along the inner side surface of the concave portion 31, and a cutout portion 78d described later is formed in a part thereof. On the other hand, as shown in FIG. 2, the pipe portion 79 is inserted (inserted) into the hollow portion 75c of the bolt 75 from the end portion 12a of the output shaft 12, and the inner peripheral surface of the hollow portion 75c and the pipe portion A gap 80 is formed between the outer peripheral surface 79. The entire length of the pipe portion 79 is disposed inside the hollow portion 75c. And the front-end | tip 79a of the pipe part 79 is located in the intermediate | middle vicinity of the hollow part 75c in an axial direction, and is nearer to the end part 12a of the output shaft 12 than the front-end | tip 75d of the axial part 75b (outside of an axial direction). positioned.

  As shown in FIGS. 3 and 4, the case 5 is provided with an adjustment hole 35 capable of adjusting the diameter of the circlip 74 attached to the annular groove 32 from the outside of the case 5. The adjustment hole 35 is a through hole having a smaller diameter than the recess 31 and is formed so as to overlap with a part of the recess 31 when viewed from the axial direction. Thereby, a part of the outer peripheral edge 78 c of the bearing 73 and the plate portion 78 is exposed in the adjustment hole 35. After the transmission 1 is assembled, the adjustment hole 35 is closed with a sealing bolt 36 (see FIG. 2B).

  A notch 78 d is formed at a position corresponding to the adjustment hole 35 on the outer peripheral edge 78 c of the plate portion 78. The cutout portion 78d is a portion formed by cutting out a part of the outer peripheral edge 78c of the plate portion 78 in a substantially U shape. FIG. 5 is a perspective view of the inside of the adjustment hole 35 as seen from the outside of the case 5. As shown in the figure, the dimension between both ends 74a, 74a of the circlip 74 is smaller than the width dimension of the notch 78d. Thereby, both ends 74a and 74a of the circlip 74 are exposed from the notch 78d.

  A pair of projecting portions 78e and 78e projecting radially outward are formed on both sides (both sides in the circumferential direction) of the notch portion 78d on the outer peripheral edge 78c of the plate portion 78. The pair of projecting portions 78e and 78e are in contact with and locked to step portions 37 and 37 provided at the boundary between the recess 31 and the adjustment hole 35, respectively. As a result, the guide plate 77 is installed in the recess 31 of the case 5 so that the plate portion 78 is prevented from rotating.

  As shown in FIGS. 2 and 3, the plate portion 78 of the guide plate 77 constitutes a partition wall between the bottom surface 31 a of the recess 31 and the end portion 12 a of the output shaft 12. The lubricating oil introduction path 33 is defined in the gap between the bottom surface 31 a of the recess 31 (the inner surface of the case 5) and the plate portion 78. Lubricating oil flowing down from the upper oil passage groove 34 is stored in the lubricating oil introduction passage 33. Then, the lubricating oil stored in the lubricating oil introduction passage 33 is introduced into the hollow portion 75c of the bolt 75 through the pipe portion 79 of the guide plate 77, and is supplied from the hollow portion 75c to the lubricating oil supply hole 71. The lubricating oil supplied to the lubricating oil supply hole 71 is supplied to the lubricated parts such as the driven gears 46 to 51 and the synchronizer 52 located on the outer periphery of the output shaft 12 through the supply port 71a. Further, the lubricating oil stored in the lubricating oil introduction passage 33 flows out from the small hole 78 b of the plate portion 78 and is supplied to the bearing 73.

  In the lubricating oil supply structure of the present embodiment, the entire pipe portion 79 of the guide plate 77 is disposed inside the hollow portion 75c of the bolt 75, and the tip 79a of the pipe portion 79 is the shaft portion of the bolt 75. It is located closer to the end 12a of the output shaft 12 than the tip 75d of 75b. With this configuration, it is possible to reduce the amount of lubricating oil that leaks from the gap between the pipe portion 79 and the hollow portion 75c of the bolt 75 toward the end portion 12a of the output shaft 12. Therefore, it is possible to secure the necessary flow rate of the lubricating oil in the lubricating oil supply hole 71 of the output shaft 12.

  Further, in the present embodiment, the pipe portion 79 disposed in the hollow portion 75c is inserted deeper than the intermediate position of the hollow portion 75c, and the tip 79a is more than the tip 75d of the shaft portion 75b. Since the output shaft 12 is positioned on the side close to the end portion 12a, the length dimension of the pipe portion 79 is optimized. As a result, a sufficient flow rate of the lubricating oil supplied to the lubricating oil supply hole 71 can be ensured. Hereinafter, this point will be described in detail using test data shown in FIG.

  FIG. 6 is a graph showing the relationship between the setting of the length dimension of the pipe portion 79 and the flow rate of the lubricating oil in the lubricating oil supply hole 71. In the graph of the figure, the vehicle speed V corresponding to the rotational speed of the output shaft 12 is taken on the horizontal axis, and the flow rate (lubricating oil amount) Q of the lubricating oil flowing in the lubricating oil supply hole 71 is taken on the vertical axis. And as the setting of the length dimension of the pipe portion 79, there are three types of lengths of the length dimension L1, the length L2 longer than the L1 and the dimension L3 shorter than the L1. When the dimensions are set, the in-shaft lubricating oil amount Q measured at each vehicle speed V is plotted and graphed. Here, the pipe portion having the long dimension L2 is of such a length that the tip projects beyond the tip portion 75d of the shaft portion 75b (the side opposite to the end portion 12a of the output shaft 12). The pipe portion having the short dimension L3 has a length such that the tip thereof is closer to the end portion 12a of the output shaft 12 than the center of the shaft portion 75b.

  As can be seen from the graph of the figure, when the pipe portion 79 having the length L1 according to the present embodiment is provided, the amount of lubricating oil Q in the shaft is relatively high in any vehicle speed range from the low vehicle speed side to the high vehicle speed side. In contrast, in the pipe portion having the longer dimension L2, the amount of lubricating oil in the shaft Q is generally smaller than that in the pipe portion 79 having the length dimension L1, particularly in the middle vehicle speed range. The reduction in the amount of lubricating oil Q in the shaft is remarkable. This causes a drop in the pressure of the lubricating oil supplied due to the long pipe portion, and the lubricating oil derived from the tip of the pipe portion leaks to the output shaft 12 end portion 12a side along the outer peripheral surface of the pipe portion. This is considered to be caused by a so-called back leak state. Further, even in a pipe portion having a shorter dimension L3, the amount of in-shaft lubricating oil Q is generally smaller than that of a pipe portion having a length of L1, and in particular, the reduction in the amount of in-shaft lubricating oil Q is remarkable at high vehicle speeds. It has become. This is thought to be because the pipe portion is short, so that the supplied lubricating oil does not reach the back side of the lubricating oil supply hole 71 sufficiently, and the in-shaft lubricating oil amount Q is insufficient. Thus, in the present embodiment, it is possible to secure a sufficient flow rate of the lubricating oil supplied to the lubricating oil supply hole 71 by optimizing the length dimension of the pipe portion 79.

  In the lubricating oil supply structure of the present embodiment, the lubricating oil flowing out from the lubricating oil supply hole 71 to the opening 72 side is dammed using a bolt 75 for attaching the bearing 73 to the end 12a of the output shaft 12. It can be stopped. Therefore, by using the bolt 75 as a substitute for the oil pass plug that attaches to the end 12a of the output shaft 12, the number of parts of the transmission 1 can be reduced and the assembly process can be simplified, and the lubricating oil supply hole It is possible to supply a sufficient amount of lubricating oil to the lubricated portion while suppressing leakage of the lubricating oil from 71.

  Further, the inner diameter dimension of the hollow portion 75 c of the bolt 75 is set to be smaller than the inner diameter dimension of the lubricating oil supply hole 71. Thereby, the stepped portion 76 is formed between the lubricating oil supply hole 71 and the hollow portion 75 c of the bolt 75, so that the lubricating oil introduced into the lubricating oil supply hole 71 is moved to the hollow portion 75 c side of the bolt 75. The return can be suppressed, and the lubricating oil in the lubricating oil supply hole 71 can be blocked. Therefore, the lubricating oil in the lubricating oil supply hole 71 can be effectively prevented from leaking from the end 12a of the output shaft 12 by the bolt 75.

  Next, the assembly procedure of the end portion 12a of the output shaft 12 composed of the above-described components and the vicinity thereof will be described. In the assembly, first, the guide plate 77 is installed in the recess 31 of the case 5. For this purpose, the pipe portion 79 of the guide plate 77 faces the inside of the case 5, and the outer peripheral edge 78 c of the plate portion 78 is aligned with the inner peripheral surface 31 b of the concave portion 31 and is installed on the bottom surface 31 a of the concave portion 31. At this time, the projecting portions 78e and 78e of the plate portion 78 are engaged with the step portions 37 and 37 in the concave portion 31, thereby positioning the guide plate 77 in the rotational direction. As a result, the notch 78d of the guide plate 77 is aligned with the adjustment hole 35. Next, a circlip 74 is attached to the annular groove 32 of the recess 31. At this time, both end portions 74 a and 74 a of the circlip 74 are aligned with the notch portion 78 d of the guide plate 77.

  On the other hand, a bearing 73 is attached to the end 12 a of the output shaft 12 in advance. For this, the inner ring 73 b of the bearing 73 is press-fitted into the outer periphery of the end 12 a of the output shaft 12, and in this state, the shaft 75 b of the bolt 75 is screwed into the opening 72 and fastened. Thereby, the inner ring 73b of the bearing 73 is locked by the head 75a of the bolt 75, and the bearing 73 is fixed to the end 12a of the output shaft 12.

  In this state, the bearing 73 and the end 12 a of the output shaft 12 are inserted into the recess 31 of the case 5, thereby fixing the bearing 73 to the recess 31. At this time, both ends 74a and 74a of the circlip 74 exposed from the outside of the case 5 to the inside of the adjustment hole 35 are gripped by a dedicated tool, and the interval between the both ends 74a and 74a is widened. As a result, the circlip 74 is retracted into the annular groove 32. In this state, the bearing 73 is fully inserted into the recess 31. Then, the circlip 74 is engaged across the annular groove 32 of the recess 31 and the annular groove 73c of the outer ring 73a of the bearing 73 by returning the distance between the both ends 74a and 74a of the circlip 74 to the original position. Thereby, the bearing 73 is fixed in the recessed part 31 in the state in which the movement in the axial direction is restricted. Further, in this state, the outer peripheral edge 78 c of the plate portion 78 is sandwiched between the outer ring 73 a of the bearing 73 and the step portion 31 c provided on the outer periphery of the bottom surface 31 a of the recess 31 through the shim (spacer) 81. Thus, the guide plate 77 is fixed in the recess 31. When the guide plate 77 is fixed, the pipe portion 79 is inserted from the end portion 12a of the output shaft 12 into the hollow portion 75c of the bolt 75 and disposed. Thus, the assembly of the end portion 12a of the output shaft 12 and its periphery is completed.

  In the lubricating oil supply structure of the present embodiment, the notch portion 78d for exposing both end portions 74a and 74a of the circlip 74 is formed on the outer peripheral edge 78c of the plate portion 78 of the guide plate 77. With the guide plate 77 installed in the recess 31, it is possible to adjust the distance between the ends 74 a and 74 a of the circlip 74 from the outside of the case 5. As a result, the work of fixing the bearing 73 in the case 5 can be facilitated. In addition, since the work of removing the bearing 73 fixed in the case 5 can be easily performed, the efficiency of the maintenance of the transmission 1 can be improved.

  Further, by forming the notch 78 d on the outer peripheral edge 78 c of the plate part 78, the diameter of the plate part 78 itself can be set to the same or larger diameter than that of the bearing 73. Accordingly, the outer peripheral edge 78c of the plate portion 78 can be configured to extend to the lower end of the lubricating oil introduction passage 33, so that the lubricating oil in the lubricating oil introduction passage 33 can be held by the plate portion 78, but through the notch portion 78d. Thus, it is possible to facilitate the work of adjusting the both end portions 74a, 74a of the circlip 74 from the adjustment hole 35.

  Further, since the protrusions 78e, 78e of the plate part 78 are locked to the step part on the case 5 side, the plate part 78 is prevented from rotating, so that the plate part 78 is installed in the recess 31 of the case 5. By just doing, the alignment of the notch 78d with respect to both ends of the adjustment hole 35 and the circlip 74 of the case 5 is performed. Therefore, it is possible to improve the efficiency of the work of assembling the guide plate 77 and the efficiency of the work of fixing the bearing 73 by adjusting the both ends 74a and 74a of the circlip 74. Further, since the rotation of the plate portion 78 can be prevented even after the transmission 1 is assembled, the notch portion 78d is formed with respect to the adjustment hole 35 of the case 5 and the both end portions 74a and 74a of the circlip 74 during maintenance. Aligned state.

  FIG. 7 is a partially enlarged view showing the output shaft 12 and its surrounding components. As shown in the figure, the other end portion (end portion on the clutch mechanism 8 side) 12 b of the output shaft 12 is rotatable on the inner surface of the clutch case (other case) 7 via a bearing (other bearing) 83. It is supported by. The lubricating oil supply hole 71 of the output shaft 12 is provided with an oil path plug (plug member) 85 for blocking the lubricating oil flowing in the lubricating oil supply hole 71 toward the end 12b. The oil path plug 85 is disposed at a position inside the bearing 83 in the axial direction of the output shaft 12, and in detail, is disposed at an intermediate position in the axial direction of the final drive gear 60 on the output shaft 12.

  The oil pass plug 85 has a cylindrical support portion 85 a and a circular annular weir portion 85 b extending radially inward from one end of the support portion 85 a, and the support portion 85 a has a lubricating oil supply hole 71. It is installed in the lubricating oil supply hole 71 by being press-fitted into the inner peripheral surface. In this state, the weir portion 85b is erected in the lubricating oil supply hole 71 so that the lubricating oil flowing out from the lubricating oil supply hole 71 toward the end portion 12b is blocked.

  By installing the oil path plug 85 described above, excessive leakage of the lubricating oil in the lubricating oil supply hole 71 from the end portion 12b of the output shaft 12 can be suppressed. In addition, since the oil path plug 85 is installed on the inner side of the bearing 83 in the axial direction of the output shaft 12, the oil path plug 85 supplies lubricating oil even when a radial load is applied to the oil path plug 85 from the bearing 83. It can be prevented from coming off the hole 71 and coming off. That is, if the oil path plug 85 is installed at the same position as the bearing 83 in the axial direction or outside the middle of the bearing 83, the radial load from the bearing 83 to the oil path plug 85 by the rotation of the output shaft 12 As a result, the oil path plug 85 is pushed out toward the end 12b of the output shaft 12 and may come off from the end 12b. On the other hand, if the oil path plug 85 is installed on the inner side of the bearing 83 as described above, the oil path plug 85 is inserted into the lubricating oil supply hole 71 even if a radial load is applied from the bearing 83. There is no risk of detaching.

  Further, since the oil pass plug 85 is installed at an intermediate position in the axial direction of the final drive gear 60, the oil pass plug 85 is axially caused by a radial load applied from the final drive gear 60 to the oil pass plug 85. Can be suppressed from being pushed out. Therefore, it is possible to prevent the installation position of the oil pass plug 85 from being shifted in the lubricating oil supply hole 71, and the function of the oil pass plug 85 can be maintained.

  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, although the case where the lubricating oil supply structure according to the present invention is applied to the output shaft 12 of the transmission 1 has been described in the above embodiment, the same lubricating oil supply structure can be provided for the input shaft 10 as well. Further, the lubricating oil supply structure of the present invention can be applied not only to the illustrated manual transmission but also to an automatic transmission (AT) and a continuously variable transmission (CVT).

1 Transmission 5 Case (Transmission case)
5a Inner surface 7 Clutch case 8 Clutch mechanism 10 Input shaft 12 Output shaft 12a (One) end portion 12b (Other) end portion 31 Recess 31a Bottom surface 32 Annular groove 33 Lubricating oil introduction path 34 Oil path groove 35 Adjustment hole 36 Sealing bolt 37, 37 Step portion 60 Final drive gear 61 Final driven gear 62 Differential device 71 Lubricating oil supply hole 71a Supply port 72 Opening portion 73 Bearing 73a Outer ring 73b Inner ring 73c Annular groove 74 Circlip (Locking tool)
74a, 74a both ends 75 bolt (fastener)
75a Head 75b Shaft 75c Hollow 77 Guide plate (guide member)
78 Plate part 78a Opening 78b Small hole 78c Outer peripheral edge 78d Notch part 78e, 78e Protrusion part 79 Pipe part 79a Tip 83 Bearing (Other bearings)
85 Oil pass plug (plug member)

Claims (6)

A transmission case,
A rotating shaft whose end is rotatably supported via a bearing in the case;
A hollow lubricating oil supply hole extending in the axial direction in the rotating shaft from an opening provided at the end;
A supply port that opens to the outer peripheral surface of the rotary shaft from the lubricating oil supply hole toward the outside in the radial direction;
A fastener fastened to the opening and attaching the bearing to the end of the rotating shaft;
A guide member that supplies the lubricating oil introduced from the lubricating oil introduction passage disposed along the inner surface of the case to the lubricating oil supply hole from the opening, and
The fastener includes a head portion that locks the bearing, a shaft portion that is screwed into the opening of the rotating shaft, and a hollow that extends through the head portion and the shaft portion and extends in the axial direction. And
The guide member includes a plate-shaped plate portion installed between the inner surface of the case, the end of the rotating shaft, and the bearing, and a cylindrical pipe portion integrally formed with the plate portion. And
The pipe part is disposed in the hollow part of the fastener, and a tip of the pipe part is located closer to the end of the rotating shaft than a tip of the shaft part. Lubricating oil supply structure for transmission. An inner diameter dimension of the hollow portion of the fastener is set to be smaller than an inner diameter dimension of the lubricating oil supply hole, and a step portion is formed at a boundary between the hollow portion and the lubricating oil supply hole. The lubricating oil supply structure for a transmission according to claim 1, wherein The other end of the rotating shaft is rotatably supported via another bearing,
The lubricating oil supply hole of the rotating shaft is provided with a plug member for blocking the lubricating oil flowing in the lubricating oil supply hole to the other end side,
3. The lubricating oil supply structure for a transmission according to claim 1, wherein the plug member is installed inside the other bearing in the axial direction of the rotating shaft. On the rotating shaft, a plurality of gears including a gear fixed to the rotating shaft and constantly acting with a driving force transmitted through the rotating shaft are installed.
4. The lubricating oil supply structure for a transmission according to claim 3, wherein the plug member is installed at an intermediate position in the axial direction of a gear on which the driving force always acts. The inner surface of the case is provided with a recess for accommodating the guide member and the bearing, and an annular groove formed on the inner peripheral surface of the recess,
A locking tool attached to the annular groove and fixing the bearing in the recess;
The locking tool is made of an elastic wire formed by annularly bending between both ends thereof, and the diameter can be adjusted by the separation dimension of the both ends.
The case is provided with an adjustment hole capable of adjusting the diameter of the locking tool attached to the annular groove from the outside of the case,
The notch part for exposing the said both ends of the said locking tool to the said adjustment hole is formed in the outer periphery of the said plate part of the said guide member, The Claim 1 thru | or 4 characterized by the above-mentioned. 2. A lubricating oil supply structure for a transmission as set forth in claim 1. A protruding portion that protrudes outward in the radial direction is formed on a side portion of the notch portion in the outer peripheral edge of the plate portion,
6. The transmission lubrication according to claim 5, wherein the projection is locked to a step formed on the inner surface of the case so that the plate is prevented from rotating. Oil supply structure.

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