JP5167228B2 - Transmission lubrication structure - Google Patents

Description

  The present invention relates to a lubricating structure for a transmission having a structure for transmitting rotation of a torque converter to a clutch via a main shaft inserted through a cylindrical stator shaft, and more specifically, a bearing provided in the transmission having the structure. The present invention relates to a lubricating structure for lubricating.

  2. Description of the Related Art Conventionally, there is a transmission having a structure in which rotation of an output element of a torque converter is transmitted to a clutch on a transmission mechanism side via a main shaft inserted through a cylindrical stator shaft. In such a transmission, a clutch drum is fixed to the main shaft protruding from the end of the cylindrical stator shaft. The end of the stator shaft and the side wall of the clutch drum face each other with a slight gap in the axial direction, and a bearing (thrust bearing) is installed in the gap.

  In the transmission having the above structure, as a lubricating structure for lubricating a bearing installed between the stator shaft and the clutch drum, for example, as shown in Patent Document 1, the stator shaft and the clutch drum are arranged from the axial center side of the main shaft. And a lubricating circuit communicating with each other is formed. And using this lubricating circuit, the lubricating oil introduced from the axial center side of the main shaft is supplied to the bearing.

JP 2007-239910 A

  However, in the structure in which lubricating oil is supplied from the axial center side of the main shaft to the bearing installed between the stator shaft and the clutch drum as in the above-described lubricating structure, a through hole for a lubricating circuit is provided in the main shaft. It needs to be formed, and it takes time and labor to process the parts. Further, since the gap between the stator shaft and the clutch drum or the gap between the stator shaft and the main shaft is used as an oil passage, a seal member and a seal structure for sealing these gaps are required. For this reason, the structure around the stator shaft becomes complicated and the number of parts increases, which may hinder downsizing and weight reduction of the transmission.

  The present invention has been made in view of the above-mentioned points, and the object thereof is to perform effective lubrication of a bearing installed between a stator shaft and a clutch drum while having a simple configuration with a reduced number of parts. It is to provide a lubrication structure for a transmission.

  In order to solve the above problems, the present invention provides a main shaft (2) that is rotated by a driving force transmitted from a torque converter (TC), and a hollow that is coaxially installed on the outer peripheral side of the main shaft (2). A stator shaft (30) having a cylindrical portion (31) and a clutch (20) having a clutch drum (21) fixed to a main shaft (2) protruding from an end portion (31a) of the stator shaft (30) And a bearing (60) installed in a gap between the end (31a) of the stator shaft (30) and the clutch drum (21), for lubricating the bearing (60) in the transmission (1) An oil path body (70) for supplying lubricating oil to the other shaft (10) disposed above the stator shaft (30) and the bearing (60), and having a lubricating structure, and an oil path An oil pipe (75) for introducing lubricating oil into the die (70) and a fitting portion (74) provided in the oil path body (70). 75) is fitted in a state in which the lubricating oil can leak from the fitting portion (74), so that the lubricating oil leaked from the fitting portion (74) is dropped and supplied to the bearing (60). It is characterized by comprising.

  According to the lubrication structure of the transmission according to the present invention, the fitting portion between the oil path body and the oil pipe disposed above the bearing is a so-called loose fitting in a state in which the lubricating oil can leak, and the fitting portion Since the lubricating oil leaked from the tank is dropped and supplied to the bearing, it is installed between the clutch drum and the stator shaft using the oil path body, which is a part for supplying the lubricating oil to the other shaft. Thus, a lubrication circuit for the bearing can be formed. Therefore, effective lubrication of the bearing installed between the clutch drum and the stator shaft can be performed while reducing the number of parts of the speed machine and simplifying the configuration. In addition, it is possible to eliminate the conventional lubrication circuit for bearings provided on the axial center side of the main shaft. This eliminates the need to form a through hole for a lubricating circuit in the main shaft, thereby simplifying the main shaft machining process. Further, the seal structure around the stator shaft and the main shaft can be simplified. Therefore, the structure of the transmission can be simplified and reduced in weight.

  Further, in the above lubricating structure of the transmission, the end portion (31a) of the stator shaft (30) has an oil receiving portion (35) formed of a recess for receiving the lubricating oil, and the fitting portion ( 74) The lubricating oil leaked out and dropped from the oil 74 may be supplied to the bearing (60) after being received by the oil receiver (35). According to this, a guide path for efficiently guiding the lubricating oil to the bearing can be configured by forming an oil receiving portion having a simple shape on the stator shaft. Therefore, the lubricating oil leaked from the fitting portion can be efficiently supplied to the bearing while having a simple structure with a reduced number of parts.

Further, in this case, a flange portion (32) extending radially outward from the end portion (31a) of the stator shaft (30) is provided, and the oil receiving portion (35) is an oil path body (70) of the flange portion (32). It is good also as a hollow which has the bottom face (35a) which inclines toward the bearing (60) formed in the edge part (32b) by the side. According to this, it becomes possible to more effectively supply the lubricating oil leaked and dropped from the fitting portion to the bearing by the oil receiving portion of the stator shaft.
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 transmission lubrication structure of the present invention, the bearing installed between the stator shaft and the clutch drum can be effectively lubricated while having a simple configuration with a reduced number of parts.

1 is a main cross-sectional view showing an example of the overall configuration of a transmission including a lubricating structure according to an embodiment of the present invention. It is the outline side view which looked at the inside of the casing of a transmission from the axial direction, and is a figure showing arrangement arrangement of a stator shaft and an oil path body. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, and is a partial side cross-sectional view showing a main shaft and its periphery. It is a perspective view which shows the oil receiving part formed in the stator shaft. It is a figure for demonstrating the flow of the lubricating oil leaked from the fitting part of the oil pass body.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a main cross-sectional view showing an example of the overall configuration of a transmission 1 having a lubricating structure according to an embodiment of the present invention. FIG. 2 is a schematic side view of the inside of the casing 17 of the transmission 1 mounted on the vehicle as viewed from the axial direction. FIG. 2 also shows an arrangement configuration of a stator shaft 30 and an oil path body 70 which will be described later. The transmission 1 shown in FIG. 1 is a belt type in which an endless V-belt 6 is wound between a driving pulley 11 provided on a driving pulley shaft 10 and a driven pulley 13 provided on a driven pulley shaft 12. A continuously variable transmission (CVT) 5 is provided. The drive pulley shaft 10 is provided with an oil path body 70 described later, and the drive pulley shaft 10 is a member corresponding to “another shaft” according to the present invention.

  The transmission 1 also includes a main shaft 2 to which a driving force (not shown) such as an engine is transmitted via a torque converter TC. On the main shaft 2, a forward clutch ( Hereinafter, it may be simply referred to as “clutch”.) 20 is provided. On the other hand, a reverse clutch 7 is disposed on the drive pulley shaft 10. Between the main shaft 2 and the drive pulley shaft 10, the gear mechanism 9 a that transmits the driving force from the main shaft 2 to the drive pulley shaft 10 by the engagement of the forward clutch 20 and the reverse clutch 7 is engaged. Is provided with a gear mechanism 9b for transmitting the driving force from the main shaft 2 to the driving pulley shaft 10. Thereby, the driving pulley shaft 10 of the belt type continuously variable transmission mechanism 5 is rotated by the driving force transmitted from the main shaft 2. On the other hand, the driving force from the driven pulley shaft 12 is transmitted to the left and right wheels (not shown) via the differential mechanism 8 and the left and right axle shafts 8a and 8b. In addition, description is abbreviate | omitted about the detailed structure and operation | movement of the belt-type continuously variable transmission mechanism 5 here. Further, the transmission mechanism to which the driving force of the main shaft 2 is transmitted is not limited to the belt type continuously variable transmission mechanism 5 described above, but may be a stepped transmission mechanism such as a planetary gear mechanism. Good.

  A casing 17 that accommodates the transmission 1 includes a torque converter case (hereinafter referred to as “TC case”) 15 that accommodates the torque converter TC, and a transmission case (hereinafter referred to as a belt type continuously variable transmission mechanism 5). , "M case"). The opening ends of the TC case 15 and the M case 16 that are open in the axial direction are connected and fixed by bolts 18. Further, as shown in FIGS. 1 and 2, the shafts such as the main shaft 2, the driving pulley shaft 10, and the driven pulley shaft 12 are installed in the casing 17 in parallel with each other. As shown in FIG. 2, in the state where the transmission 1 is mounted on the vehicle, these shafts are arranged in the horizontal direction, and the drive pulley shaft 10 is located above the main shaft 2. positioned.

  FIG. 3 is a cross-sectional view corresponding to the arrow AA in FIG. 2, and is a partial side cross-sectional view showing the main shaft 2 and its periphery. As shown in FIG. 3, the torque converter TC that transmits the driving force from the engine to the main shaft 2 is coupled to the main shaft 2 in a state of being opposed to the pump impeller 41 driven by the crankshaft 3 and the pump impeller 41. A turbine runner 42, a stator 43 provided between the pump impeller 41 and the turbine runner 42, and a one-way clutch 44 provided between the stator 43 and the stator shaft 30. A lockup clutch piston 46 with a damper is disposed between the turbine runner 42 and the engine drive plate 45.

  An impeller shell 48 is connected to the end of the converter cover 47 opposite to the crankshaft 3, and a torque converter sleeve 49 is connected to the inner peripheral side of the impeller shell 48. One end of the torque converter sleeve 49 extends to the clutch 20 side. A sprocket 50 for driving an oil pump (not shown) is fitted to the outer periphery of the torque converter sleeve 49. The sprocket 50 is rotatably supported by the bearing 51 with respect to the end portion 15 a on the inner peripheral side of the TC case 15. The outside of the turbine runner 42 is covered with a turbine shell 52. An inner peripheral portion of the turbine shell 52 is fixed to the main shaft 2 via a hub 53. The one-way clutch 44 that supports the stator 43 is spline-fitted to the stator shaft 30.

  The stator shaft 30 includes a hollow cylindrical portion 31 through which the main shaft 2 passes, and a substantially flat flange portion 32 extending radially outward from an end portion 31a of the cylindrical portion 31 on the clutch 20 side. have. As shown in FIG. 1, the outer peripheral side of the flange portion 32 is fixed to the TC case 15.

  Returning to FIG. 3, the main shaft 2 protruding from the cylindrical portion 31 of the stator shaft 30 is fixed to the clutch drum 21 of the clutch 20. The clutch drum 21 has a bottomed cylindrical shape that surrounds the torque converter TC side of the clutch 20, and includes an outer peripheral wall 21a and an inner peripheral wall 21b, and a side wall (bottom wall) 21c that connects axial ends of the outer peripheral wall 21a and the inner peripheral wall 21b. And have. Here, detailed description of the internal configuration of the clutch 20 is omitted.

  The side wall 21c of the clutch drum 21 is disposed in a plane orthogonal to the axial direction, and the side wall 21c and the flange portion 32 of the stator shaft 30 face each other with a slight gap in the axial direction. doing. At the inner peripheral end of the flange portion 32 of the stator shaft 30, a projecting portion 33 made of an annular projection projecting toward the clutch 20 is provided. In addition, a guide portion 29 made of an annular protrusion protruding toward the stator shaft 30 is provided on the side wall 21c of the clutch drum 21.

  The diameter of the guide part 29 is formed to be slightly larger than the diameter of the protruding part 33. The inner peripheral surface of the guide portion 29 is opposed to the outer peripheral surface of the protruding portion 33 in the radial direction via a minute gap, and the gap is sealed in a liquid-tight state. On the other hand, a bearing (thrust bearing) 60 interposed between the flange portion 32 of the stator shaft 30 and the side wall 21 c of the clutch drum 21 is disposed on the outer peripheral surface of the guide portion 29. The bearing 60 is a needle bearing and is configured to support an axial load between the stator shaft 30 and the clutch drum 21. The bearing 60 is a bearing lubricated by the lubrication structure according to the present invention.

  Further, the main shaft 2 penetrating the inner diameter side of the clutch 20 is rotatably supported at its tip 2a by a bearing 66 with respect to the center plate 65. The center plate 65 is a substantially flat plate-like member installed in a plane orthogonal to the axial direction of the main shaft 2, and an outer peripheral end 65 a is fixed to the M case 16 as shown in FIG. 1. Has been.

  On the other hand, as shown in FIGS. 2 and 3, an oil path body 70 for supplying lubricating oil to the drive pulley shaft 10 is installed above the stator shaft 30. The oil path body 70 is a member installed in a plane orthogonal to the axial direction of the drive pulley shaft 10, and an annular main body 71 that surrounds the outer periphery of the drive pulley shaft 10, and a radially outer side from the main body 71. And a plurality of arm portions 72 extending in the direction. A rib 73 for reinforcing the main body 71 is formed on the outer peripheral surface 71 a of the main body 71. The rib 73 is formed of a belt-like protrusion along the circumferential direction provided on the outer peripheral surface 71 a of the main body 71.

  Further, an oil pipe 75 for introducing lubricating oil into the oil path body 70 is provided. The oil pipe 75 is made of a substantially cylindrical rod-like member, and is installed in parallel with the main shaft 2 obliquely above the main shaft 2 when viewed from one end side in the axial direction. And the fitting part 74 which consists of a recessed part which fits the edge part 75a of the oil pipe 75 is provided in the front-end | tip of the one arm part 72 which the oil pass body 70 has. As shown in FIG. 3, the oil pipe 75 has one end 75 a fitted in the fitting portion 74 of the oil path body 70 and the other end 75 b fitted in the center plate 65. Accordingly, the oil pipe 75 communicates the oil passage 65 a in the center plate 65 and the oil passage 70 a in the oil path body 70.

  Here, the end portion 75 a of the oil pipe 75 is fitted to the fitting portion 74 in a so-called loose state, so that the lubricating oil can be leaked from the fitting portion 74. Accordingly, the lubricating oil introduced from the center plate 65 to the oil path body 70 through the oil pipe 75 leaks from the fitting portion 74 to the outside of the oil path body 70. The lubricating oil leaked from the fitting part 74 is dripped down from the lower end along the outer surface of the oil path body 70 as shown by the dotted line in FIG.

  On the other hand, the stator shaft 30 is formed with an oil receiving portion 35 for receiving the lubricating oil dropped from the oil path body 70. FIG. 4 is a perspective view showing the oil receiving portion 35 formed on the stator shaft 30. FIG. 5 is a view for explaining the flow of the lubricating oil leaked from the fitting portion 74 of the oil path body 70. The oil path body 70 and the end portion 31a of the stator shaft 30 are viewed from the side in the axial direction. FIG. As shown in FIG. 4, the oil receiving portion 35 is formed by a recess formed in the flange portion 32 of the stator shaft 30. That is, the flange portion 32 of the stator shaft 30 has fixing bolt holes 32a and 32a disposed above both outer sides of the cylindrical portion 31, and the upper end side connecting the bolt holes 32a and 32a on both sides. 32b extends in a substantially horizontal direction orthogonal to the axial direction. And the oil receiving part 35 is formed as a saucer-shaped hollow provided in this upper end side 32b. The oil receiving portion 35 is formed at a position directly above the cylindrical portion 31 at the upper end side 32b of the flange portion 32, and the shape seen from the side in the axial direction is as shown in FIG. It is recessed from the upper end side 32 b toward the side surface 32 c on the clutch 20 side, and the bottom surface 35 a is formed in a curved surface shape that is inclined toward the bearing 60. As shown in FIGS. 2 and 5, the upper end side 32 b of the flange portion 32 is arranged facing the oil path body 70 side (upper side), and the oil receiving portion 35 is a main body portion of the oil path body 70. It is located below the rib 73 formed on 71.

  Here, the flow of the lubricating oil leaked from the fitting portion 74 of the oil pass body 70 will be described. In the transmission 1 of the present embodiment, the lubricating oil introduced from the center plate 65 to the oil path body 70 through the oil pipe 75 leaks from the fitting portion 74 to the outside of the oil path body 70. At this time, the lubricating oil leaked from the fitting portion 74 reaches the outer peripheral surface 71a of the main body portion 71 through the arm portion 72 of the oil path body 70 from the fitting portion 74 as shown in FIGS. This lubricating oil travels along the protruding rib 73 formed on the outer peripheral surface 71 a of the main body 71, and drops downward from the rib 73. The dropped lubricating oil is received by the oil receiving portion 35 of the stator shaft 30 located below the rib 73. The lubricating oil received by the oil receiving portion 35 is guided to the side surface 32c side of the flange portion 32 through the inclined bottom surface 35a of the oil receiving portion 35, and is supplied to the bearing 60 and its periphery.

  As described above, the bearing lubrication structure provided in the transmission 1 according to the present embodiment includes the oil path body 70 for supplying the lubricant to the drive pulley shaft 10 disposed above the stator shaft 30 and the bearing 60. The oil pipe 75 includes an oil pipe 75 for introducing lubricating oil, and a fitting portion 74 provided in the oil path body 70. The fitting portion 74 is used to fit the oil pipe 75 in the fitting portion 74. Thus, the lubricating oil leaked from the fitting portion 74 was dropped and supplied to the bearing 60.

  With this configuration, a lubricating circuit for the bearing 60 installed between the clutch drum 21 and the stator shaft 30 is configured using the oil path body 70 for supplying the driving pulley shaft 10 with lubricating oil. be able to. Therefore, the bearing 60 can be effectively lubricated while the number of parts of the transmission 1 is reduced and the configuration is simplified. Further, it is possible to eliminate the lubrication circuit for the bearing 60 that has conventionally been provided on the axial center side of the main shaft 2. This eliminates the need to form a through hole for the lubricating circuit in the main shaft 2, thereby simplifying the machining process of the main shaft 2. Further, the seal structure around the stator shaft 30 and the main shaft 2 can be simplified. Therefore, the configuration of the transmission 1 can be simplified and reduced in weight.

  In the present embodiment, an oil receiving portion 35 for receiving the lubricating oil is formed on the end portion 31a of the stator shaft 30 (specifically, the upper end side 32b of the flange portion 32 provided on the end portion 31a). The lubricating oil leaked from the fitting portion 74 is received by the oil receiving portion 35 and then supplied to the bearing 60. Thus, by forming the oil receiving portion 35 having a simple shape on the stator shaft 30, a guide path for efficiently guiding the lubricating oil to the bearing 60 can be configured. Therefore, the lubricating oil leaked from the fitting portion 74 can be efficiently supplied to the bearing 60 while having a simple structure with a reduced number of parts.

  Further, in the present embodiment, the oil receiving portion 35 formed on the stator shaft 30 has a bottom surface 35a inclined toward the bearing 60 formed on the upper end side (end portion on the oil path body 70 side) 32b of the flange portion 32. It consists of a dimple. Thereby, the lubricating oil leaked from the fitting portion 74 can be supplied to the bearing 60 more effectively.

  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, a transmission to which the present invention is applied includes an oil path body for supplying lubricating oil to a stator shaft and a shaft disposed above the bearing, an oil pipe for introducing the lubricating oil to the oil path body, As long as the transmission includes a fitting portion that fits an end portion of an oil pipe provided in the oil path body, the other specific configuration is not necessarily limited to that shown in the above embodiment. . Therefore, the present invention is not limited to the transmission provided with the belt type continuously variable transmission mechanism shown in the above embodiment, but can be applied to transmissions having other configurations.

DESCRIPTION OF SYMBOLS 1 Transmission 2 Main shaft 5 Belt type continuously variable transmission mechanism 10 Drive pulley shaft 12 Driven pulley shaft 17 Casing 20 Clutch (forward clutch)
21 Clutch drum 21c Side wall 30 Stator shaft 31 Cylindrical portion 31a End portion 32 Flange portion 32b Upper end side (end portion on the oil path body side)
35 Oil receiving portion 35a Bottom surface 60 Bearing 65 Center plate 70 Oil path body 71 Body portion 71a Outer peripheral surface 72 Arm portion 73 Rib 74 Fitting portion 75 Oil pipe 75a End portion

Claims (3)

A main shaft that is rotated by the driving force transmitted from the torque converter;
A stator shaft having a hollow cylindrical portion coaxially installed on the outer peripheral side of the main shaft;
A clutch having a clutch drum fixed to the main shaft protruding from an end of the stator shaft;
A bearing installed between an end of the stator shaft and the clutch drum;
A lubricating structure for lubricating the bearing in a transmission comprising:
An oil path body for supplying lubricating oil to the stator shaft and another shaft disposed above the bearing;
An oil pipe for introducing lubricating oil into the oil path body;
A fitting portion provided in the oil pass body;
With
By fitting the oil pipe to the fitting portion in a state where the lubricating oil can leak from the fitting portion, the lubricating oil leaked from the fitting portion is dropped and supplied to the bearing. A lubricating structure for a transmission, characterized in that it is configured. The end portion of the stator shaft is formed with an oil receiving portion including a recess for receiving lubricating oil,
The lubricating structure for a transmission according to claim 1, wherein the lubricating oil leaked and dropped from the fitting portion is received by the oil receiving portion and then supplied to the bearing. A flange portion extending radially outward from the end portion of the stator shaft;
The lubrication for a transmission according to claim 2, wherein the oil receiving portion is a recess having a bottom surface inclined toward the bearing formed at an end portion of the flange portion on the oil path body side. Construction.

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