JP2017133646A - Oil pump drive structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil pump drive structure capable of driving an oil pump arranged on an opposite side to a front cover side of a torque converter with respect to an input shaft.SOLUTION: On an opposite side to a front cover 11 side of a torque converter 2 with respect to an input shaft 41 of an automatic transmission 3, that is, a left side of the input shaft 41, an oil pump 4 is arranged. At a rotation center portion of a front part 16 of the front cover 11, an opening 18 is formed, and to the opening 18, a center piece 21 is fixed in a fitting state. The center piece 21 has a hollow structure opened to the oil pump 4 side, and is spline-fitted to one end part of a pump drive shaft 52 of the oil pump 4 inserted thereinside.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oil pump drive structure applied to a unit including a torque converter and an automatic transmission.

  In a vehicle equipped with an automatic transmission, driving force from an engine is input to the automatic transmission via a torque converter, and driving force shifted by the automatic transmission is transmitted to driving wheels. For example, a continuously variable transmission (CVT) or a stepped automatic transmission (AT) is widely used as the automatic transmission.

  In an automatic transmission, a brake for braking the rotating element, a clutch for connecting the rotating element and another rotating element, and the like are often used. It is necessary to supply oil for operating brakes, clutches, and torque converters. Further, the brake and the clutch must absorb the differential rotation between the rotating elements, and need to supply oil for lubrication in order to prevent seizure due to the absorption of the differential rotation. Therefore, in the automatic transmission, the hydraulic pressure generated by the oil pump is regulated by the valve body, and the regulated hydraulic pressure is supplied from the valve body to each part that needs to supply oil through the oil passage.

  FIG. 2 is a cross-sectional view showing a configuration in the vicinity of the input shaft 102 of the conventional automatic transmission 101. In FIG. 2, the hatching indicating the cross section is omitted.

  One end of the input shaft 102 of the automatic transmission 101 is inserted into the torque converter 103. A gap is provided between one end of the input shaft 102 and the front cover 104 of the torque converter 103 in the direction of the rotational axis of the input shaft 102. The pump impeller 105 of the torque converter 103 is located on the automatic transmission 101 side with respect to the front cover 104, is coupled to the front cover 104, and can be rotated around the input shaft 102 and can rotate integrally with the front cover 104. ing. A turbine runner 106 of the torque converter 103 is provided between the front cover 104 and the pump impeller 105. The turbine runner 106 is supported on the input shaft 102 so as to be integrally rotatable. A lockup clutch 107 is provided between the front cover 104 and the turbine runner 106. The lock-up clutch 107 is engaged by a hydraulic pressure difference between the release-side oil chamber 108 between the lock-up clutch 107 and the front cover 104 and the engagement-side oil chamber 109 on the opposite side across the lock-up clutch 107. /To be released.

  The input shaft 102 is inserted through a tubular stator shaft 111. One end of the stator shaft 111 extends between the pump impeller 105 and the turbine runner 106, and the stator 112 of the torque converter 103 is fixed to one end thereof. A first housing 114 of the oil pump 113 is fixed to the other end portion of the stator shaft 111.

  The first housing 114 projects outward from the stator shaft 111 in the rotational radial direction, and has a thickness in the rotational axis direction. A second housing 115 of the oil pump 113 is provided on the torque converter 103 side with respect to the first housing 114. The first housing 114 and the second housing 115 are fastened with bolts 116 to constitute a pump housing that houses the pump gear 117 therein. The pump gear 117 is rotatably provided around the stator shaft 111. One end of a sleeve 119 that is externally fitted to the stator shaft 111 with a gap 118 is connected to the pump gear 117. The other end of the sleeve 119 is connected to the pump impeller 105. Accordingly, when the front cover 104 is rotated by the driving force of the engine and the pump impeller 105 is rotated, the sleeve 119 and the pump gear 117 are rotated, and hydraulic pressure is output from the oil pump 113.

Japanese Patent Laying-Open No. 2015-145682

  In the above-described configuration, since the oil pump 113 is disposed around the stator shaft 111 through which the input shaft 102 is inserted, the pump gear 117 of the oil pump 113 is connected to the pump impeller 105 of the torque converter 103 by the sleeve 119, The oil pump 113 can be driven (pump gear 117 is rotated) by the driving force input to the front cover 104.

  However, in a configuration in which the oil pump is disposed on the rear side of the input shaft, that is, on the side opposite to the torque converter side, the sleeve 119 cannot be extended to the position of the oil pump. Therefore, a new structure for driving the oil pump is required.

  An object of the present invention is to provide an oil pump drive structure that enables driving of an oil pump disposed on the side opposite to the front cover side of a torque converter with respect to an input shaft.

  In order to achieve the above object, an oil pump drive structure according to the present invention is an oil pump drive structure applied to a unit including a torque converter and an automatic transmission, and the torque converter is a vehicle mounted with the unit. It has a front cover to which power from the drive source is input, an oil pump is arranged on the opposite side of the front cover side with respect to the input shaft of the automatic transmission, and an opening formed in the rotation center portion of the front cover, A center piece having a hollow structure opened to the oil pump side is fixed in a fitted state, and one end portion of the drive shaft of the oil pump is inserted into the center piece, and the one end portion and the center piece are spline-fitted. Match.

  According to this configuration, the oil pump is disposed on the side opposite to the front cover side of the torque converter with respect to the input shaft of the automatic transmission. An opening is formed in the rotation center portion of the front cover, and a center piece is fixed to the opening in a fitted state. The center piece has a hollow structure opened to the oil pump side, and is spline-fitted with one end of an oil pump drive shaft inserted into the center piece. As a result, power input to the front cover can be transmitted to the oil pump via the drive shaft, and the oil pump can be driven.

  The input shaft is formed into a hollow shaft, one end of the input shaft is inserted into the torque converter, the drive shaft of the oil pump is inserted into the input shaft, and the input shaft and the drive shaft are connected to the pump housing of the oil pump. A supply oil passage for supplying oil may be formed therebetween.

  According to this configuration, oil can be supplied to the torque converter through the supply oil passage.

  According to the present invention, it is possible to drive the oil pump disposed on the side opposite to the front cover side of the torque converter with respect to the input shaft.

It is sectional drawing which shows the oil pump drive structure which concerns on one Embodiment of this invention. It is sectional drawing which shows the conventional oil pump drive structure.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Configuration>
FIG. 1 is a cross-sectional view showing an oil pump drive structure 1 according to an embodiment of the present invention. In FIG. 1, the hatching indicating the cross section is omitted.

  The oil pump drive structure 1 is applied to a unit including the torque converter 2 and the automatic transmission 3 to drive the oil pump 4.

  The torque converter 2 includes a front cover 11, a pump impeller 12, a turbine runner 13, a lockup clutch 14, and a stator 15.

  The front cover 11 extends in a substantially annular plate shape extending in the rotation radial direction around the rotation axis, and is bent toward the automatic transmission 3 side (left side in FIG. 1, hereinafter referred to as “left side”), thereby rotating in the rotation axis direction. It extends to the left side. Thus, the front cover 11 integrally includes a substantially annular plate-shaped front portion 16 extending in the rotation radial direction and a substantially cylindrical outer peripheral portion 17 extending in the rotation axis direction. Power from a drive source (for example, an engine) of a vehicle on which a unit including the torque converter 2 and the automatic transmission 3 is mounted is input to the front portion 16. The rotation center portion of the front portion 16 bulges slightly on the side opposite to the automatic transmission 3 side (the right side in FIG. 1, hereinafter referred to as “right side”), and a circular opening 18 is formed in the bulged portion. Is formed.

  A center piece 21 is fitted in the opening 18. The center piece 21 includes a main body 22 and a lid 23.

  The main body 22 is formed in a substantially cylindrical shape. The thickness between the inner peripheral surface 24 and the outer peripheral surface 25 of the main body 22 is larger than the thickness of the front portion 16 of the front cover 11 and is, for example, twice or more the thickness of the front portion 16. As a result, the main body 22 is formed as a center piece formed integrally with the front portion 16 of the front cover 11 (a center formed by bending the rotation center portion of the front portion 16 into a substantially U shape so as to bulge to the right side. The strength is greater than that of the piece.

  A spline 26 extending in the rotation axis direction is formed at an intermediate portion of the inner peripheral surface 24. Both end portions of the inner peripheral surface 24 are formed to have a larger diameter than the intermediate portion where the spline 26 is formed. Thereby, at the time of manufacturing the main body 22 (at the time of cutting), the cutting blade for forming the spline 26 can be satisfactorily inserted into the main body 22, and the manufacturing efficiency of the main body 22 can be increased.

  The outer peripheral surface 25 of the left end portion 27 of the main body 22 is notched so that the outer diameter thereof matches the diameter of the opening 18 of the front cover 11. Then, the left end portion 27 is fitted into the opening 18, and the center axis of the opening 18 and the main body 22 of the center piece 21 is accurately aligned by the inlay. The main body 22 is firmly fixed to the front cover 11 by welding in a state where the left end portion 27 is fitted in the opening 18.

  The lid 23 is formed in a disc shape having a diameter corresponding to the inner diameter of the right end portion 28 of the main body 22 (the diameter of the inner peripheral surface 24). The lid 23 is press-fitted inside the inner peripheral surface 24 from the right side of the main body 22 to close the right end of the inner peripheral surface 24.

  The pump impeller 12 is disposed on the left side of the front cover 11. The outer peripheral end portion of the pump impeller 12 is connected to the outer peripheral portion 17 of the front cover 11 and is fixed to the outer peripheral portion 17 by welding. Thus, the pump impeller 12 is provided so as to be rotatable integrally with the front cover 11.

  The turbine runner 13 is disposed between the front cover 11 and the pump impeller 12 and is provided so as to be rotatable about a rotation axis.

  The lockup clutch 14 is disposed between the front cover 11 and the turbine runner 13. The lockup clutch 14 is engaged by a hydraulic pressure difference between the release side oil chamber 31 between the lockup clutch 14 and the front cover 11 and the engagement side oil chamber 32 between the lockup clutch 14 and the pump impeller 12. Combined / released.

  The stator 15 is disposed between the pump impeller 12 and the turbine runner 13 and is fixed to the unit case 5.

  The automatic transmission 3 includes an input shaft 41.

  The input shaft 41 is formed as a hollow shaft and extends on the rotation axis. The right end of the input shaft 41 is inserted into the torque converter 2 and is spline-fitted with the turbine runner 13 of the torque converter 2. Thereby, the turbine runner 13 and the input shaft 41 are provided so as to be integrally rotatable.

  The outer periphery of the input shaft 41 is surrounded by a substantially cylindrical stator shaft 42. A gap 43 is provided between the input shaft 41 and the stator shaft 42. A right end portion of the stator shaft 42 is inserted into the torque converter 2. The stator 15 of the torque converter 2 is supported on the right end of the stator shaft 42. A space is provided between the stator shaft 42 and the turbine runner 13, and a gap 43 between the input shaft 41 and the stator shaft 42 is engaged between the stator shaft 42 and the turbine runner 13. It communicates with the side oil chamber 32.

  The oil pump 4 is disposed on the left side of the input shaft 41. The oil pump 4 includes a pump housing 51, a pump drive shaft 52, and a pump gear 53.

  The pump housing 51 is attached to the unit case 5.

  The pump drive shaft 52 extends along the rotation axis and is inserted into the input shaft 41. A spline 55 extending in the rotation axis direction is formed on the outer peripheral surface of the right end portion 54 of the pump drive shaft 52. The right end portion 54 of the pump drive shaft 52 is inserted inside the inner peripheral surface 24 of the main body 22 of the center piece 21 and is splined with the center piece 21. A gap 56 is formed between the inner peripheral surface of the input shaft 41 and the outer peripheral surface of the pump drive shaft 52. The left end of the gap 56 is closed by a seal 57 interposed between the inner peripheral surface of the input shaft 41 and the outer peripheral surface of the pump drive shaft 52, and the right end thereof is open. Thus, the gap 56 communicates with the release side oil chamber 31 between the lockup clutch 14 and the front cover 11.

  The pump gear 53 is accommodated in the pump housing 51 and is provided so as to be rotatable integrally with the pump drive shaft 52. When the front cover 11 of the torque converter 2 rotates, the pump drive shaft 52 rotates, and the pump gear 53 rotates together with the pump drive shaft 52, so that the oil pump 4 outputs hydraulic pressure.

  The pump housing 51 is provided with a supply oil passage 58 through which oil is supplied from a valve body (not shown). An axial center oil passage 59 is formed in the pump drive shaft 52. The shaft center oil passage 59 is open at the left end of the pump drive shaft 52 and communicates with the supply oil passage 58. Further, the shaft center oil passage 59 communicates with a gap 56 between the input shaft 41 and the pump drive shaft 52 via a connection oil passage 60 formed in the pump drive shaft 52. As a result, oil can be supplied from the supply oil path 58 to the gap 56 between the input shaft 41 and the pump drive shaft 52 through the shaft center oil path 59 and the connection oil path 60, and the oil is torqued through the gap 56. It can be supplied to the release side oil chamber 31 of the converter 2 as hydraulic oil.

<Effect>
As described above, the oil pump 4 is disposed on the side opposite to the front cover 11 side of the torque converter 2 with respect to the input shaft 41 of the automatic transmission 3, that is, on the left side of the input shaft 41. An opening 18 is formed in the center of rotation of the front portion 16 of the front cover 11, and a center piece 21 is fixed to the opening 18 in a fitted state. The center piece 21 has a hollow structure opened to the oil pump 4 side, and is spline-fitted with one end portion of the pump drive shaft 52 of the oil pump 4 inserted therein. As a result, power input to the front cover 11 can be transmitted to the oil pump 4 via the pump drive shaft 52, and the oil pump 4 can be driven.

<Modification>
Although one embodiment of the present invention has been described above, the present invention can be implemented in other forms, and various modifications can be made to the above-described configuration within the scope of the matters described in the claims. It is possible to apply.

DESCRIPTION OF SYMBOLS 1 Oil pump drive structure 2 Torque converter 3 Automatic transmission 4 Oil pump 11 Front cover 18 Opening 21 Centerpiece 26 Spline 41 Input shaft 52 Pump drive shaft 55 Spline

Claims (1)

An oil pump drive structure applied to a unit including a torque converter and an automatic transmission,
The torque converter includes a front cover to which power from a drive source of a vehicle on which the unit is mounted is input.
An oil pump is disposed on the opposite side of the front cover side with respect to the input shaft of the automatic transmission,
A center piece having a hollow structure opened to the oil pump side is fixed in an engaged state in an opening formed in the rotation center portion of the front cover,
An oil pump drive structure in which one end of a drive shaft of the oil pump is inserted into the center piece, and the one end and the center piece are spline-fitted.

Images