JP6351566B2 - Oil supply structure - Google Patents

Description

  The present invention relates to an oil supply 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, hatching is omitted to improve the visibility of the drawing.

  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. As a result, when the front cover 104 rotates and the pump impeller 105 rotates, the sleeve 119 and the pump gear 117 rotate, and hydraulic pressure is output from the oil pump 113.

  A clutch 121 is provided on the opposite side of the first housing 114 of the oil pump 113 from the second housing 115. The first housing 114 forms a piston chamber 123 to which oil for moving the piston 122 (engagement of the clutch 121) is supplied between the first housing 114 and the piston 122 of the clutch 121.

  A first oil passage 124 and a second oil passage 125 are formed in the input shaft 102. The first oil passage 124 communicates the space 126 between the input shaft 102 and the stator shaft 111 and the release side oil chamber 108. The second oil passage 125 communicates with a space 127 between the input shaft 102 and the stator shaft 111. The spaces 126 and 127 are separated by a bush 128.

  In the first housing 114 of the oil pump 113, supply oil passages 131 and 132 communicating with the gap 118 and the space 126 are formed. Oil is supplied from the supply oil passage 131 through the gap 118 to the engagement side oil chamber 109. The release-side oil chamber 108 is supplied with oil from the supply oil passage 132 through the space 126 and the first oil passage 124. Although not shown, the first housing 114 is formed with supply oil passages that supply oil to the piston chamber 123 and the second oil passage 125, respectively. Oil flowing through the second oil passage 125 is supplied to the clutch 121 and the like as lubricating oil.

Japanese Patent Laid-Open No. 10-103455

  Thus, a large number of supply oil passages are formed in the first housing 114 of the oil pump 113. For this reason, the size of the first housing 114 is large, and the processing cost of the first housing 114 is high.

  An object of the present invention is to provide an oil supply structure capable of reducing the size and cost of an oil pump.

  In order to achieve the above object, an oil supply structure according to the present invention is an oil supply structure applied to a unit including a torque converter and an automatic transmission, and in this oil supply structure, an input shaft of the automatic transmission is provided. Is formed in the hollow shaft, an end of one side thereof is inserted into the torque converter, an oil pump is disposed apart from the one side of the input shaft, and the oil pump is driven. A shaft is inserted into the input shaft, and a supply oil passage for supplying oil is formed between the input shaft and the drive shaft in the pump housing of the oil pump.

  According to this configuration, the oil pump is disposed not on the torque converter and the automatic transmission but on the opposite side of the torque converter from the input shaft of the automatic transmission. Therefore, it is possible to eliminate the necessity of forming a large number of supply oil passages in the pump housing of the oil pump for supplying the hydraulic oil for the clutch provided in the torque converter and the automatic transmission and the lubricating oil for lubricating each part. .

  That is, torque converters and automatic transmissions have many locations for supplying oil (hydraulic oil or lubricating oil), and usually a valve body is arranged below them, so there are many places between the torque converter and the automatic transmission. It is necessary to arrange the supply oil passage. Therefore, in the conventional structure, since the oil pump is disposed between the torque converter and the automatic transmission, a large number of supply oil passages are formed in the pump housing of the oil pump. In the structure according to the present invention, since the oil pump is disposed on the opposite side of the torque converter from the input shaft of the automatic transmission, it is separated from the oil pump between the torque converter and the automatic transmission. It is possible to form a supply oil passage in the member. This eliminates the need to form a large number of supply oil passages in the pump housing of the oil pump.

  Therefore, the size and cost (processing cost) of the oil pump (pump housing) can be reduced.

  In addition, since the input shaft is formed as a hollow shaft and the drive shaft of the oil pump is inserted into the input shaft, the gap between the input shaft and the drive shaft can be used as an oil path. A supply oil path for supplying oil to the oil path between the input shaft and the drive shaft is formed in the pump housing, so that the supply oil path for supplying oil to at least one place is automatically connected to the torque converter. It is possible to eliminate the need to form a member disposed between the transmission and the transmission. As a result, not only the oil pump but also the entire unit can be reduced in size and cost.

  The drive shaft of the oil pump may be connected to the front cover of the torque converter. Thus, torque input from the drive source to the torque converter can be transmitted to the drive shaft via the front cover.

  According to the present invention, the size and cost of the oil pump can be reduced, and the size and cost of not only the oil pump but also the entire unit can be reduced.

It is sectional drawing which shows the oil supply structure which concerns on one Embodiment of this invention. It is sectional drawing which shows the conventional oil supply 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 supply structure 1 according to an embodiment of the present invention. In FIG. 1, hatching is omitted to improve the visibility of the drawing.

  The oil supply structure 1 is applied to a unit including a torque converter 2 and an automatic transmission 3.

  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 disk shape around the rotation axis, and has an outer peripheral end bent toward the automatic transmission 3 (left side in FIG. 1; hereinafter referred to as “left side”). The center portion of the front cover 11 bulges on the side opposite to the automatic transmission 3 side (the right side in FIG. 1 and hereinafter referred to as the “right side”). Torque from a drive source (for example, an engine) is input to this bulged portion.

  The pump impeller 12 is disposed on the left side of the front cover 11. The outer peripheral end of the pump impeller 12 is connected to the outer peripheral end of the front cover 11 and is provided so as to be able to rotate integrally with the front cover 11 around the rotation axis.

  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 a release side oil chamber 16 between the lockup clutch 14 and the front cover 11 and an engagement side oil chamber 17 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 4.

  The automatic transmission 3 includes an input shaft 21 and a clutch 22.

  The input shaft 21 is formed as a hollow shaft and extends on the rotation axis. The right end of the input shaft 21 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 21 are provided so as to be integrally rotatable.

  The outer periphery of the input shaft 21 is surrounded by a substantially cylindrical stator shaft 23. A gap 24 is provided between the input shaft 21 and the stator shaft 23. A right end portion of the stator shaft 23 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 23. A space is provided between the stator shaft 23 and the turbine runner 13, and a gap 24 between the input shaft 21 and the stator shaft 23 is engaged between the stator shaft 23 and the turbine runner 13. It communicates with the side oil chamber 17.

  The clutch 22 includes a clutch drum 25 and a clutch hub 26. The clutch drum 25 is provided so as to be rotatable integrally with the input shaft 21, and projects outward from the input shaft 21 in the rotational radial direction. The clutch hub 26 is formed integrally with a gear 28 supported on the input shaft 21 via a bearing 27.

  A plurality of clutch plates 29 and 30 are provided between the clutch drum 25 and the clutch hub 26, respectively. The plurality of clutch plates (clutch plates) 29 are supported by the clutch drum 25 and are arranged at intervals in the rotation axis direction. Further, the plurality of clutch plates (clutch discs) 30 are supported by the clutch hub 26 and arranged so as to be alternately arranged with the clutch plates 29 in the rotation axis direction.

  A piston 31 is disposed inside the clutch drum 25 so as to be movable in the direction of the rotation axis. A piston chamber 32 is formed between the clutch drum 25 and the piston 31.

  An oil pump 5 is disposed on the left side of the input shaft 21. The oil pump 5 includes a pump housing 41, a pump drive shaft 42, and a pump gear 43.

  The pump housing 41 is attached to the unit case 4.

  The pump drive shaft 42 extends along the rotation axis and is inserted into the input shaft 21. The right end of the pump drive shaft 42 is directly connected to the front cover 11 of the torque converter 2. A gap 44 is formed between the inner peripheral surface of the input shaft 21 and the outer peripheral surface of the pump drive shaft 42. The left end of the gap 44 is closed by a seal 45 interposed between the inner peripheral surface of the input shaft 21 and the outer peripheral surface of the pump drive shaft 42, and the right end thereof is opened. Thereby, the gap 44 communicates with the release-side oil chamber 16 between the lockup clutch 14 and the front cover 11.

  The pump gear 43 is accommodated in the pump housing 41 and is provided so as to be rotatable integrally with the pump drive shaft 42. When the front cover 11 of the torque converter 2 rotates, the pump drive shaft 42 rotates, and the pump gear 43 rotates together with the pump drive shaft 42, whereby hydraulic pressure is output from the oil pump 5.

  The pump housing 41 is formed with a supply oil passage 46 through which oil is supplied from a valve body (not shown). An axial center oil passage 47 is formed in the pump drive shaft 42. The shaft center oil passage 47 is opened at the left end of the pump drive shaft 42 and communicates with the supply oil passage 46. Further, the shaft center oil passage 47 communicates with a gap 44 between the input shaft 21 and the pump drive shaft 42 through a connection oil passage 48 formed in the pump drive shaft 42.

  A retainer 51 is provided between the torque converter 2 and the clutch 22. The retainer 51 is installed between the unit case 4 and the stator shaft 23, and holds the stator shaft 23 fixedly to the unit case 4. The retainer 51 is formed with a supply oil passage 52 through which oil is supplied from a valve body (not shown). In addition, a communication oil passage 53 that communicates with the supply oil passage 52 is formed in the stator shaft 23. The communication oil passage 53 is opened at the left end of the stator shaft 23, and communicates with the space on the left side of the piston 31 in the clutch 22 through the space between the input shaft 21 and the clutch drum 25 of the clutch 22. Further, distribution oil passages 54 and 55 are formed in the stator shaft 23. The communication oil path 53 communicates with the piston chamber 32 of the clutch 22 via the distribution oil path 54 and communicates with the gap 24 between the input shaft 21 and the stator shaft 23 via the distribution oil path 55. .

  The hydraulic pressure generated by the oil pump 5 is regulated by the valve body and supplied from the valve body to the supply oil passages 46 and 52.

  Oil flowing through the supply oil passage 46 by hydraulic pressure is supplied to the gap 44 between the input shaft 21 and the pump drive shaft 42 through the shaft center oil passage 47 and the connection oil passage 48, and the torque converter 2 passes through the gap 44. The release side oil chamber 16 is supplied as hydraulic oil.

  Oil flowing through the supply oil passage 52 by hydraulic pressure is supplied as lubricating oil into the clutch 22 through the communication oil passage 53 and the input shaft 21 and the clutch drum 25 of the clutch 22. Further, the oil flowing through the supply oil passage 52 by hydraulic pressure is supplied as hydraulic oil to the piston chamber 32 of the clutch 22 through the communication oil passage 53 and the distribution oil passage 54. Further, the oil flowing through the supply oil passage 52 by hydraulic pressure passes through the communication oil passage 53, the distribution oil passage 55, and the gap 24 between the input shaft 21 and the stator shaft 23 to the engagement side oil chamber 17 of the torque converter 2. Supplied as hydraulic oil.

<Effect>
As described above, in the oil supply structure 1, the oil pump is separated from the input shaft 21 of the automatic transmission 3 on the side opposite to the torque converter 2 side, not between the torque converter 2 and the automatic transmission 3. 5 is arranged. Therefore, the supply oil passage 52, the communication oil passage 53, the distribution oil passages 54, 55 for supplying the working oil of the clutch 22 provided in the torque converter 2 and the automatic transmission 3 and the lubricating oil for lubricating each part, etc. It is possible to eliminate the need to form a large number of supply oil passages including the oil pump 5 in the pump housing 41 of the oil pump 5.

  Therefore, the size and cost (processing cost) of the oil pump 5 (pump housing 41) can be reduced.

  Further, the input shaft 21 is formed as a hollow shaft, and the pump drive shaft 42 of the oil pump 5 is inserted into the input shaft 21, so that the gap 44 between the input shaft 21 and the pump drive shaft 42 is an oil passage. Used as A supply oil passage 46 for supplying oil to the oil passage formed by the gap 44 is formed in the pump housing 41, so that the supply oil passage 46 for supplying oil to at least one location is automatically shifted with the torque converter 2. The necessity to form in the retainer 51 arrange | positioned between the machines 3 can be eliminated. As a result, not only the oil pump 5 but also the size and cost of the entire unit can be reduced.

<Modification>
As mentioned above, although one Embodiment of this invention was described, this invention can also be implemented with another form.

  For example, the pump drive shaft 42 is directly connected to the front cover 11 of the torque converter 2, but the right end of the pump drive shaft 42 is located in the middle of the input shaft 21, and the pump drive shaft 42 is located in the input shaft 21. A connecting shaft that connects the front cover 11 and the front cover 11 may be provided. In this case, a gap is provided between the input shaft 21 and the coupling shaft, and the gap 44 between the input shaft 21 and the pump drive shaft 42 is torqued via the gap between the input shaft 21 and the coupling shaft. The open side oil chamber 16 of the converter 2 is communicated.

  In addition, various design changes can be made to the above-described configuration within the scope of the matters described in the claims.

DESCRIPTION OF SYMBOLS 1 Oil supply structure 2 Torque converter 3 Automatic transmission 5 Oil pump 21 Input shaft 41 Pump housing 42 Pump drive shaft 46 Supply oil path

Claims (1)

An oil supply structure applied to a unit including a torque converter and an automatic transmission,
The input shaft of the automatic transmission is formed as a hollow shaft, and one end thereof is inserted into the torque converter,
An oil pump is arranged apart from the one side and the opposite side with respect to the input shaft,
A drive shaft of the oil pump is inserted into the input shaft;
A supply oil path for supplying oil between the input shaft and the drive shaft is formed in the pump housing of the oil pump ,
A shaft center oil passage is formed in the drive shaft,
The shaft center oil passage is opened at the end of the drive shaft on the pump housing side, communicates with the supply oil passage, and between the end of the drive shaft on the pump housing side and the opposite end. Oil supply structure that is blocked in the middle .

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