JP2019152228A - Lubrication structure of tolerance ring - Google Patents

Abstract

To provide a lubrication structure of a tolerance ring capable of improving lubrication performance in a simple structure.SOLUTION: In a lubrication structure of a tolerance ring 10 inserted between a rotor shaft 20 and a gear shaft 30, sliding parts 80A, 80B on which inner peripheral surfaces 11a, 11b of the tolerance ring 10 and an outer peripheral surface 30a of the gear shaft 30 slide with each other are positioned radially outward with respect to a fitting part 50 where an inner peripheral part of the rotor shaft 20 and an outer peripheral portion of the gear shaft 30 are spline-fitted, the tolerance ring 10 has a projection part 13 extending from the first sliding part 80A to the fitting part 50 side, the projection part 13 is arranged on an oil passage 40 formed by a gap between the rotor shaft 20 and the gear shaft 30, and an inner peripheral surface 11c shields the oil passage 40.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lubricating structure for a tolerance ring.

  Patent Document 1 discloses disposing a tolerance ring between a rotor shaft of a motor and an output-side rotation shaft in a vehicle power transmission device. With this tolerance ring, it is possible to suppress the occurrence of rattling noise caused by rattling between the rotor shaft and the output side rotating shaft.

JP 2017-105372 A

  As described above, since the tolerance ring is sandwiched between the two rotating shafts, the contact surface with the rotating shaft slides in the circumferential direction. Therefore, it is necessary to lubricate this sliding part with oil. In the configuration described in Patent Document 1, an oil passage for supplying lubricating oil to the tolerance ring is provided inside the rotating shaft, and a supply port of the oil passage is opened on the outer peripheral surface of the rotating shaft. However, with this structure, it is necessary to finely process the rotating shaft, which may increase the cost. Therefore, although a structure in which no supply port is provided on the rotating shaft is conceivable, in this structure, the oil sticks to the outer peripheral side due to the centrifugal force of the rotating shaft, and it is difficult for the lubricating oil to be supplied to the inner peripheral surface side of the tolerance ring. turn into.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a lubrication structure for a tolerance ring that can improve the lubrication performance with a simple structure.

  The present invention is a lubrication structure of a tolerance ring inserted between a rotor shaft and a gear shaft, and a sliding portion on which the inner peripheral surface of the tolerance ring and the outer peripheral surface of the gear shaft slide is provided on the rotor shaft. The inner peripheral portion and the outer peripheral portion of the gear shaft are located radially outside the fitting portion where the spline is fitted, and the tolerance ring has a protruding portion that extends from the sliding portion to the fitting portion side, and protrudes. The portion is disposed on an oil passage formed by a gap between the rotor shaft and the gear shaft, and an inner peripheral surface thereof shields the oil passage.

  In the present invention, the sliding part between the tolerance ring and the gear shaft is located radially outside the fitting part between the rotor shaft and the gear shaft, and the protruding part extends from the sliding part to the fitting part side of the tolerance ring. Is blocking the oil passage. As a result, even when oil flowing from the fitting portion side toward the tolerance ring side sticks to the outer periphery side of the oil passage due to centrifugal force, the oil is slid by the protruding portion of the tolerance ring that shields the oil passage. It can be led to the moving part. As a result, the lubrication performance at the sliding portion can be improved.

FIG. 1 is a cross-sectional view showing a lubrication structure of a tolerance ring according to an embodiment. FIG. 2 is an enlarged cross-sectional view for explaining the lubrication structure of the tolerance ring.

  Hereinafter, a lubricating structure for a tolerance ring in an embodiment of the present invention will be specifically described with reference to the drawings. Note that the present invention is not limited to the embodiments described below.

  FIG. 1 is a cross-sectional view showing a lubrication structure of a tolerance ring according to an embodiment. FIG. 2 is an enlarged cross-sectional view for explaining the lubrication structure of the tolerance ring. The present embodiment is a lubrication structure of the tolerance ring 10 applied to the power transmission device 100 for a vehicle.

  The target vehicle in the present embodiment is a hybrid vehicle including an engine and a motor / generator MG as power sources. As shown in FIG. 1, a tolerance ring 10 is disposed between a rotor shaft 20 and a gear shaft 30 in a vehicle power transmission device 100. The tolerance ring 10 is inserted into the rotor shaft 20 while being attached to the gear shaft 30. Torque output from the motor / generator MG is transmitted from the rotor shaft 20 to a gear shaft 30 that is an output-side rotation shaft. 1 represents the rotation center axis of the rotating member constituting the power transmission device 100.

  The tolerance ring 10 includes a base portion 11 that is formed in a substantially annular shape and a raised portion 12 that protrudes radially outward from the base portion 11.

  The base 11 can be elastically deformed by a notch provided in a part in the circumferential direction, and can be fitted into the gear shaft 30 in advance. The base portion 11 has inner peripheral surfaces 11 a and 11 b that are in contact with the outer peripheral surface 30 a of the gear shaft 30 on both sides in the axial direction of the raised portion 12 as cylindrical inner peripheral surfaces that are continuously formed along the circumferential direction. The outer peripheral surface 30a includes a non-contact inner peripheral surface 11c. The inner peripheral surfaces 11a and 11b are sliding surfaces that slide on the outer peripheral surface 30a. The inner peripheral surface 11c is a surface that dams up the oil flowing in the oil passage 40 on the oil passage 40 formed by a gap (radial gap) between the inner peripheral surface 20a of the rotor shaft 20 and the outer peripheral surface 30a of the gear shaft 30. It becomes.

  The raised portion 12 is disposed at the center of the base portion 11 in the axial direction, and is in contact with the inner peripheral surface 20 a of the rotor shaft 20. A plurality of the raised portions 12 are arranged at equal intervals in the circumferential direction, and a flat portion is formed between the raised portions 12 adjacent in the circumferential direction. For example, the raised portions 12 are each formed in a trapezoidal shape when viewed from the axial direction.

  Further, the inner peripheral portion of the rotor shaft 20 and the outer peripheral portion of the gear shaft 30 are spline-fitted. The rotor shaft 20 is a hollow shaft, and inner peripheral spline teeth 21 are provided on the inner peripheral portion thereof. The gear shaft 30 is a hollow shaft having one end inserted into the rotor shaft 20, and outer peripheral spline teeth 31 are provided on the outer peripheral portion thereof. A portion where the outer peripheral spline teeth 31 and the inner peripheral spline teeth 21 mesh with each other is a fitting portion (spline fitting portion) 50. The fitting part 50 is loose fitting and has a gap through which lubricating oil can flow. The gap of the fitting portion 50 is included in a part of the oil passage 40.

  The rotor shaft 20 is an input-side rotation shaft that rotates integrally with the rotor 22 of the motor / generator MG, and is rotatably supported with respect to the case 70 via a bearing 61. The bearing 61 is constituted by a rolling bearing having an inner ring 61 a fitted to the outer peripheral portion of the rotor shaft 20 and an outer ring 61 b fitted to the case 70.

  The gear shaft 30 is an output-side rotation shaft that rotates integrally with a gear (not shown), and is rotatably supported with respect to the case 70 via a bearing 62. The bearing 62 is constituted by a rolling bearing having an inner ring 62 a fitted to the outer periphery of the gear shaft 30 and an outer ring 62 b fitted to the case 70.

  For example, the tolerance ring 10 is made of a metal elastic material. The tolerance ring 10 is compressed and deformed in the radial direction between the rotor shaft 20 and the gear shaft 30 after the assembly, so that the contact surface between the gear shaft 30 and the tolerance ring 10 and the rotor shaft 20 and the tolerance ring 10 are A pressing force is generated between the contact surfaces of the two surfaces so as to press each other vertically. Since the circumferential frictional resistance is generated based on the pressing force and the friction coefficient between the contact surfaces, the rotor shaft 20 and the gear shaft 30 are held in the circumferential direction without rattling by the tolerance ring 10. . As a result, even when the fitting portion 50 is not clogged, the tolerance ring 10 holds the rotor shaft 20 and the gear shaft 30 without rattling. Sound is suppressed.

  On the contact surface between the gear shaft 30 and the tolerance ring 10, a first sliding portion 80A on which the inner peripheral surface 11a and the outer peripheral surface 30a slide, and an inner peripheral surface 11b and the outer peripheral surface 30a slide. 2 sliding portions 80B. 80 A of 1st sliding parts are located in the fitting part 50 side rather than the protruding part 12, and the 2nd sliding part 80B is located in the opposite side to the fitting part 50 with respect to the protruding part 12. FIG. In each of the sliding portions 80A and 80B, the inner peripheral surfaces 11a and 11b are in surface contact with the outer peripheral surface 30a of the gear shaft 30 and slide in the circumferential direction within a predetermined width (predetermined axial length). This is the part that requires lubrication (the part that needs lubrication). In the present embodiment, as shown in FIGS. 1 and 2, the first and second sliding portions 80 </ b> A and 80 </ b> B are located radially outside the fitting portion 50 between the rotor shaft 20 and the gear shaft 30. ing. For example, a stepped portion 23 is provided on the inner peripheral surface 20 a of the rotor shaft 20 at a position radially outside the tooth bottom portion 21 a of the inner peripheral spline teeth 21.

  The step portion 23 is provided at a position where the radial position straddles the radial position of each sliding portion 80A, 80B, and is formed to have a predetermined radial length (step). The inner peripheral surface 20a has a step portion 23 with a radially inner portion (small diameter portion) from the sliding portions 80A and 80B and a radially outer portion (large diameter portion) from the sliding portions 80A and 80B. Connected. Further, the axial position of the step portion 23 is closer to the fitting portion 50 than the first sliding portion 80A.

  Further, the tolerance ring 10 has a protruding portion 13 in which the base portion 11 extends to the fitting portion 50 side with respect to the first sliding portion 80A. The protruding portion 13 includes an end portion on one side in the axial direction of the base portion 11, and is disposed at a position that blocks the space of the oil passage 40 between the radially outer side and the inner side. As shown in FIGS. 1 and 2, the end portion on one side in the axial direction of the protruding portion 13 is in contact with the step portion 23 of the rotor shaft 20. And the internal peripheral surface of the protrusion part 13 is the internal peripheral surface 11c mentioned above, and has shielded the space inside the radial direction of the oil path 40 on the oil path 40. FIG. Thereby, the protruding portion 13 causes the lubricating oil flowing in the oil passage 40 from the fitting portion 50 side to the tolerance ring 10 side to lubricate necessary portions (respective sliding portions 80A and 80B) on the inner peripheral surface side of the tolerance ring 10. Exhibits the function of promoting supply.

  Here, the flow of the lubricating oil in the oil passage 40 will be described. As an example, a case where oil flows in the oil passage 40 from the fitting portion 50 side to the tolerance ring 10 side will be described. Since the fitting part 50 is loose fitting, the gap forms part of the oil passage 40. The oil flowing in the oil passage 40 from the fitting portion 50 side to the tolerance ring 10 side moves radially outward by centrifugal force and sticks to the inner peripheral surface 20a of the rotor shaft 20. On the oil passage 40, the protruding portion 13 of the tolerance ring 10 is provided at a position that protrudes from the first sliding portion 80 </ b> A toward the fitting portion 50 and blocks the oil flowing through the oil passage 40. The inner peripheral surface 11 c of the protruding portion 13 shields the space on the radially inner side of the oil passage 40. Further, the sliding portions 80 </ b> A and 80 </ b> B are arranged on the radially outer side than the fitting portion 50. Therefore, the oil supplied from the fitting portion 50 side flows in the axial direction along the inner peripheral surface 11c of the protruding portion 13, and thus is introduced toward the first sliding portion 80A. The oil supplied to the first sliding portion 80A is also supplied to the second sliding portion 80B on the opposite side in the axial direction. In this way, the lubricating oil is supplied to the sliding portions 80A and 80B where the tolerance ring 10 and the gear shaft 30 slide. And the oil supplied to each sliding part 80A, 80B flows out from the other end side in the axial direction, and flows toward the radial outside from the gap on the front end part 20b side of the rotor shaft 20.

  As described above, according to the embodiment, in the structure in which the tolerance ring 10 is inserted between the rotor shaft 20 and the gear shaft 30, the sliding portions 80 </ b> A and 80 </ b> B are radially outward from the fitting portion 50. Since the protrusion 13 is located on the oil passage 40, the oil flowing in the oil passage 40 can be guided to the sliding portions 80A and 80B by the inner peripheral surface 11c of the protrusion 13. Thereby, the lubrication performance of the tolerance ring 10 can be improved with a simple structure.

  Further, examples of vehicles to which the tolerance ring 10 can be applied include vehicles in which the above-described motor / generator MG is the second motor / generator (MG2). The power transmission device 100 may be configured such that the gear shaft 30 functions as an input shaft of an automatic transmission (not shown).

DESCRIPTION OF SYMBOLS 10 Tolerance ring 11 Base part 11a, 11b, 11c Inner peripheral surface 12 Raised part 20 Rotor shaft 20a Inner peripheral surface 21 Inner peripheral spline tooth 21a Tooth bottom part 23 Step part 30 Gear shaft 30a Outer peripheral surface 31 Outer peripheral spline tooth 40 Oil path 50 Fitting Joint part (spline fitting part)
80A, 80B Sliding part 100 Power transmission device

Claims (1)

A lubrication structure of a tolerance ring inserted between the rotor shaft and the gear shaft,
The sliding portion where the inner peripheral surface of the tolerance ring and the outer peripheral surface of the gear shaft slide is larger in diameter than the fitting portion where the inner peripheral portion of the rotor shaft and the outer peripheral portion of the gear shaft are spline-fitted. Located outside the direction,
The tolerance ring has a protruding portion extending from the sliding portion toward the fitting portion,
The lubricating structure for a tolerance ring, wherein the protrusion is disposed on an oil passage formed by a gap between the rotor shaft and the gear shaft, and an inner peripheral surface thereof shields the oil passage.

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