JP2008133902A - Oil suction performance improving type strainer structure for driving system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil suction performance improving type strainer structure for a driving system for a vehicle capable of preventing an oil suction failure of an oil pump caused by air mixture by stably sucking oil containing a small amount of air by the oil pump without increasing an amount of oil stored in an oil pan even though an inertial force in a vehicle width direction or a vehicle longitudinal direction is continuously generated over a long period of time and an oil liquid surface in the oil pan is inclined over a long period of time. <P>SOLUTION: This structure has: the oil pan; a strainer provided in contact with the bottom surface of the oil pan and having a wall which has an opening communicating with the inside of the oil pan and is made to serve as a baffle; at least one oil sump storing a part of oil sucked by the oil pump through the strainer and supplied to the inside of the driving system; and at least one drain circuit making the oil sump part communicate with the inside of the strainer. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle drive device that prevents an oil suction failure of an oil pump due to air mixing when oil stored in an oil pan is sucked by an oil pump via a strainer and supplied into the drive device. The present invention relates to a strainer structure with improved oil suction performance.

Conventionally, when the oil in the oil pan of the vehicle drive device is sucked by the oil pump through the strainer and supplied to the drive device, as a technique for preventing the oil suction failure of the oil pump due to air mixing, For example, what was disclosed by patent document 1 is known. In this prior art, an oil passage for returning oil into the oil pan from the downstream side of the oil cooler and an oil guide for guiding the oil returned to the oil pan to the vicinity of the suction port of the strainer are provided, and the oil pump is provided via the strainer. A part of the oil sucked in and supplied into the drive device is supplied to the strainer again through the oil passage and the oil guide, so that it is not affected by the stirring in the automatic transmission of the drive device, Oil with low air content is sucked into the oil pump to prevent the oil pump from poorly sucking oil due to air contamination.
JP2001-12585

  However, in the above conventional technique, the opening at the end of the oil guide protrudes from the bottom surface of the oil pan toward the intake of the strainer, and the intake of the strainer has a gap with respect to the opening of the oil guide. The width of the strainer suction port is wider than the area of the oil guide opening, so the vehicle width depends on vehicle behavior (for example, sudden start, sudden braking, sudden turn, climb) When the inertial force in the direction of the vehicle or in the longitudinal direction of the vehicle continues for a long time, the oil level in the oil pan also tilts for a long time, and if the oil level in the oil pan decreases during that time, the strainer suction port Is exposed to the air and air is sucked.

  Therefore, in the above prior art, the amount of oil stored in the oil pan is increased so that the suction port of the strainer is not exposed to the air even if the oil level is inclined for a long time. There is a problem that it must be maintained at a high position.

  Therefore, the present invention reduces the amount of oil stored in the oil pan even if the inertia force in the vehicle width direction or the vehicle longitudinal direction is continuously generated for a long time and the oil level in the oil pan is inclined for a long time. Oil drive performance improvement type of vehicle drive device that can prevent oil suction failure of oil pump due to air mixture by stably sucking oil with low air content into oil pump without increasing It aims to provide a strainer structure.

  The present invention has been made to solve the above-mentioned problems, and the oil suction performance-enhanced strainer structure of the vehicle drive device according to the present invention is provided in contact with the oil pan and the bottom surface of the oil pan. And a strainer having an opening communicating with the oil pan, the wall serving as a baffle, and one of the oils sucked by the oil pump through the strainer and supplied into the driving device. And at least one drain circuit that communicates the oil reservoir with the inside of the strainer.

  In such a strainer structure for improving the oil suction performance of the vehicle drive device of the present invention, the strainer is provided in contact with the bottom surface of the oil pan, and the wall portion of the strainer having an opening communicating with the oil pan. Since the oil has a function as a baffle, the oil sucked into the strainer is accommodated in the wall portion of the strainer.

  Furthermore, a drain circuit for connecting the oil reservoir to the inside of the strainer is provided together with an oil reservoir for holding a part of the oil sucked by the oil pump through the strainer. Oil with a low air content that is fixed and not affected by stirring in the automatic transmission of the drive device is always supplied into the strainer via the drain circuit.

  Therefore, according to the strainer structure for improving the oil suction performance of the vehicle drive device of the present invention, the inertial force in the vehicle width direction or the vehicle front-rear direction due to vehicle behavior (for example, sudden start, sudden braking, sudden turn, climb) is long. Even if it occurs for a long time, the oil in the strainer does not move, and the oil retained in the oil reservoir can be continuously sucked into the oil pump, so the oil stored in the oil pan Without increasing the amount of oil, it is possible to prevent oil suction failure of the oil pump due to air mixing.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram conceptually showing a strainer structure for improving the oil suction performance of a vehicle drive device according to the first embodiment of the present invention, together with a part of the drive device having the strainer structure. FIG. 2 is a cross-sectional view showing an axial cross section of a part of the drive device having the strainer structure for improving the oil suction performance of the vehicle drive device according to the first embodiment. The drive device provided with the strainer structure of 1st Example of this invention is shown.

  As shown in FIG. 2, the drive device 1 having the strainer structure of the first embodiment is constructed by assembling an engine body (not shown), a torque converter 3, and a multistage automatic transmission 5 in this order. The oil pump 7 is interposed between the torque converter 3 and the multistage automatic transmission 5, and is provided on the front side of the vehicle body (not shown) of the vehicle. An oil pan 9 for storing ATF oil (automatic transmission hydraulic fluid, hereinafter simply referred to as “oil”) is provided in the lower part.

  As shown in FIG. 1, the strainer structure of the first embodiment is stored in the oil pan 9 in the hydraulic control circuit 11 having the oil pan 9 and a control valve for shifting the multistage automatic transmission 5. A strainer 13 that communicates with the suction side of the oil pump 7 that pumps the oil that has been pumped, and an oil retainer that is provided in the casing 21 of the multistage automatic transmission 5 and that retains part of the oil discharged from the oil pump 7. And a drain circuit 25 for connecting the oil retaining portion 23 and the oil pan 9 to each other. The hydraulic control circuit 11 is connected to the torque converter 3, and the hydraulic control circuit 11 has an outlet on the outlet side. An oil cooler 15 for cooling the oil and a transmission 17 such as a transmission clutch or a transmission brake of the multistage automatic transmission 5 are communicated with each other. The mouth-side lubrication unit 19 such as a gear or the sliding part is communicated with the oil passing through them shifting portion 17 and the lubricating portion 19 is collected in the oil pan 9.

  The strainer 13 is formed in a reverse tray shape so as to contact the bottom surface 9a of the oil pan 9 and partially cover the bottom surface 9a, and extends toward the bottom surface 9a of the oil pan 9 of the strainer 13. The wall 13a formed to communicate with the inside of the oil pan 9 from the lower end of the wall 13a that contacts the bottom surface 9a of the oil pan 9 in order to guide the lubricated oil into the strainer 13. A suction port 13b is provided as an opening formed by cutting out the wall portion 13a. Further, a cylindrical nozzle 13c that protrudes upward from a part of the upper portion of the strainer 13 and communicates with the suction side of the oil pump 7 is formed integrally with the strainer 13, and oil is filtered inside the strainer 13. A filter 13d is provided.

  One end of the drain circuit 25 is connected to the oil retaining portion 23, and the other end of the drain circuit 25 is in the strainer 13 of the oil pan 9, that is, in the space defined by the bottom surface 9a of the oil pan 9 and the strainer 13. Further, the oil pan 9 and the strainer 13 are connected to each other.

  In this first embodiment, the strainer structure for improving the oil suction performance of the vehicle drive device is provided with the strainer 13 in contact with the bottom surface 9a of the oil pan 9, and the strainer 13 has Since the wall portion 13 a having the communicating opening portion has a function as a baffle, the oil sucked into the strainer is accommodated in the wall portion 13 a of the strainer 13.

  In addition, an oil reservoir 23 that holds part of the oil sucked by the oil pump 7 through the strainer 13 and a drain circuit 25 that communicates the oil reservoir 23 with the strainer 13 are provided. Oil having a low air content, which is held in the retaining portion 23 and is not affected by stirring in the multistage automatic transmission 5 of the drive device 1, is constantly supplied into the strainer 13 via the drain circuit 25. The

  Therefore, according to the strainer structure for improving the oil suction performance of the vehicle drive device of the first embodiment, the inertia in the vehicle width direction or the vehicle front-rear direction due to the vehicle behavior (for example, sudden start, sudden braking, sudden turn, climb) Even if the force is generated continuously for a long time, the oil in the strainer 13 does not move, and the oil retained in the oil retaining portion 23 can be continuously sucked into the oil pump 7. Without increasing the amount of oil stored in the pan 9, it is possible to prevent the oil pump 7 from sucking oil due to air mixing.

  In addition, according to the strainer structure for improving the oil suction performance of the vehicle drive device according to the first embodiment, the wall portion 13a of the strainer 13 extends from the end portion in contact with the bottom surface 9a of the oil pan 9 to the wall portion 13a. In addition to the oil supplied from the oil retaining portion 23, the suction port 13b that is formed by notching is provided, so that the oil that has been lubricated and returned to the oil pan 9 can be reliably secured. In addition, since the oil level in the oil pan 9 can be lowered while being guided into the suction port 13b of the strainer 13, the amount of oil stored in the oil pan 9 can be reduced.

  Next, a second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 3 is a block diagram conceptually showing the oil suction performance improving strainer structure of the vehicle drive device according to the second embodiment of the present invention, together with a part of the drive device having the strainer structure, FIG. 4 is a sectional view showing an axial section of a part of the drive device having the oil suction performance improving type strainer structure of the vehicle drive device of the second embodiment, and FIG. 5 is the second embodiment. It is the block diagram which showed typically the drive device provided with the oil suction performance improvement type strainer structure of the vehicle drive device of the example, and the code | symbol 30 in the figure has the strainer structure of 2nd Example of this invention. Shows the drive device. Further, parts common to the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  In the drive device 30 having the strainer structure of the second embodiment, the torque converter 3 and the multistage automatic transmission 5 are separated from each other, and the engine body is located on the front side of the vehicle body (not shown). A front unit 32 having a torque converter 3 (not shown) and a rear unit having a multi-stage automatic transmission 5 and a differential (not shown) are provided on the rear side of the vehicle body. 33 is provided.

  That is, the drive device 30 of the second embodiment is composed of the same elements as the drive device 1 of the first embodiment as shown in FIG. 3, but is shown within the range surrounded by the dotted line in FIG. The elements are arranged on the front side of the vehicle body, while the elements shown outside the range surrounded by the dotted line in FIG. 3 are arranged on the rear side of the vehicle body.

  As shown in FIG. 4, a converter cover 34 is provided at the rear end portion of the torque converter 3 of the front unit 32, and the oil pump 7 is interposed between the torque converter 3 and the converter cover 34. The oil pump 7 includes a pump housing 7a disposed on the torque converter 3 side, a pump cover 7b opposed to the pump housing 7a and disposed on the converter cover 34 side, and between the pump housing 7a and the pump cover 7b. And a pump gear 7c that rotates at the same speed as the rotation of the engine via the pump drive shaft 36. The pump drive shaft 36 and the pump housing 7a are sealed by an oil seal 38. Further, the oil suction passage 7 d on the pump cover 7 b side of the oil pump 7 is provided with an air vent hole 7 e for extracting air mixed in the oil sucked by the oil pump 7.

  An output shaft 40 that outputs rotation from the engine toward the multi-stage automatic transmission 5 of the rear unit 33 extends along the axial direction inside the converter cover 34, and the output shaft 40 and the converter cover 34 are output. Is provided with a space (space indicated by hatching in FIG. 4) to be the oil retaining portion 42. A drain discharge port 42 a for discharging the oil retained by the oil retaining portion 42 protrudes from the lower portion of the oil retaining portion 42, and the output shaft 40 and the converter cover 34 at the rear end portion of the converter cover 34. An oil seal 48 that seals the oil retaining portion 42 is provided therebetween. The oil retaining portion 42 communicates with the seal chamber 46 having the oil seal 38 of the oil pump 7 through the oil passage 44 and also communicates with the oil suction passage 7d through the air vent hole 7e. The oil leaking from the air vent hole 7e is sucked into the oil retaining portion 42 through the oil passage 44 and the air vent hole 7e as shown by the arrows in FIG. 4, and is discharged from the drain outlet 42a.

  Further, as shown in FIG. 5, the front unit 32 and the rear unit 33 are connected by a propeller shaft 50, and the rotation of the output shaft 40 of the front unit 32 is not shown through the propeller shaft 50. It is transmitted to the input shaft. An oil pan 9 similar to that of the first embodiment is provided at the lower part of the multi-stage automatic transmission 5 of the rear unit 33, and the oil retaining portion 42 of the front unit 32 and the strainer 13 of the oil pan 9 of the rear unit 33 are provided. The one end is connected to the drain outlet 42 a of the oil retaining portion 42, and the other end is connected to be connected by a drain pipe 52 as a drain circuit penetrating the oil pan 9 and the strainer 13.

  In addition, between the suction side of the oil pump 7 and the strainer 13, between the discharge side of the oil pump 7 and the inlet side of the hydraulic control circuit 11, and between the hydraulic control circuit 11 and the torque converter 3, between the front unit and the rear unit. The extended pipes are connected to each other by pipes (not shown in FIG. 5) so that the respective line pressures of the multistage automatic transmission 5 can be maintained. Other configurations and operations are the same as those of the driving apparatus 1 shown in the first embodiment.

  In the strainer structure for improving the oil suction performance of the vehicle drive device according to the second embodiment having the oil pan 9, the strainer 13, the oil retaining portion 42 and the drain pipe 52, the strainer 13 is provided with the oil pan 9. Since the wall portion 13a of the strainer 13 having an opening communicating with the oil pan 9 has a function as a baffle, the oil sucked into the strainer 13 is provided in contact with the bottom surface 9a of the strainer 13. It is accommodated in the wall 13a.

  Further, a drain pipe 52 as a drain circuit for connecting the oil stopper 42 to the inside of the strainer 13 is provided together with an oil stopper 42 that holds a part of the oil sucked by the oil pump 7 through the strainer 13. Therefore, the oil with a small air content that is not affected by the agitation in the multistage automatic transmission 5 of the drive device 30 and is retained in the oil retaining portion 42 is transferred into the strainer 13 via the drain pipe 52. Always supplied.

  Therefore, according to the strainer structure for improving the oil suction performance of the vehicle drive device of the second embodiment, the inertia in the vehicle width direction or the vehicle front-rear direction due to the vehicle behavior (for example, sudden start, sudden braking, sudden turn, climb) Even if the force is generated continuously for a long time, the oil in the strainer 13 does not move, and the oil retained in the oil retaining portion 42 can be continuously sucked into the oil pump 7. Without increasing the amount of oil stored in the pan 9, it is possible to prevent the oil pump 7 from sucking oil due to air mixing.

  In addition, according to the strainer structure for improving the oil suction performance of the vehicle drive device of the second embodiment, the wall portion 13a of the strainer 13 extends from the end portion in contact with the bottom surface 9a of the oil pan 9 to the wall portion 13a. In addition to the oil supplied from the oil retaining portion 42, the suction port 13b, which is formed by cutting out, is provided to ensure that the oil that has been lubricated and returned to the oil pan 9 has been returned. In addition, since the oil level in the oil pan 9 can be lowered while being guided into the suction port 13b of the strainer 13, the amount of oil stored in the oil pan 9 can be reduced.

  Furthermore, according to the strainer structure for improving the oil suction performance of the vehicle drive device of the second embodiment, the oil retaining portion 42 is provided in the front unit 32 including the oil pump 7 of the drive device 30. As a result, the pressure in the front unit 32, that is, in the oil retaining portion 42 can be reduced by the strainer 13 communicated with the oil retaining portion 42, so that leakage occurs from the oil seal 38 portion of the oil pump 7 and the air vent hole 7e. The oil to be discharged can be sufficiently discharged to the strainer 13, and oil leakage from the front unit 32 can be prevented.

  As mentioned above, although demonstrated based on the example of illustration, the oil suction performance improvement type strainer structure of the drive device for vehicles of this invention is not limited to the Example mentioned above, It changes suitably within the description range of a claim. For example, a plurality of oil retaining portions may be provided at a plurality of locations, and a plurality of drain circuits or drain pipes may be provided accordingly.

  Thus, according to the strainer structure for improving the oil suction performance of the vehicle drive device according to the present invention, the inertia force in the vehicle width direction or the vehicle front-rear direction is prolonged for a long time depending on the vehicle behavior (for example, sudden start, sudden braking, sudden turn, climb) Even if the oil is continuously generated, the oil in the strainer does not move, and the oil retained in the oil reservoir can be continuously sucked into the oil pump. Without increasing the amount, it is possible to prevent oil suction failure of the oil pump due to air mixing.

  Note that, in the strainer structure for improving the oil suction performance of the vehicle drive device according to the present invention, from the end of the wall portion of the strainer in contact with the bottom surface of the oil pan, to the wall portion, at least the opening portion is provided. Notches that constitute a part may be provided, and in this way, in addition to the oil supplied from the oil reservoir, the oil that has been lubricated and returned to the oil pan is reliably opened. While being able to guide into the part, the oil level in the oil pan can be lowered, so that the amount of oil stored in the oil pan can be reduced.

  Furthermore, in the strainer structure for improving the oil suction performance of the vehicle drive device according to the present invention, the oil retaining portion may be provided in a front unit including the oil pump of the drive device. Then, the pressure in the front unit can be reduced by the strainer, so that oil leaking from the oil pump can be sufficiently discharged to the strainer, and oil leakage from the front unit can be prevented.

It is the block diagram which showed notionally the oil suction performance improvement type strainer structure of the vehicle drive device of 1st Example of this invention with a part of drive device provided with the strainer structure. It is sectional drawing which showed the cross section of the one part axial direction of the drive device provided with the oil suction performance improvement type strainer structure of the drive device for vehicles of the said 1st Example. It is the block diagram which showed notionally the oil suction performance improvement type strainer structure of the vehicle drive device of 2nd Example of this invention with a part of drive device which provided the strainer structure. It is sectional drawing which showed the one part axial section of the drive device provided with the oil suction performance improvement type strainer structure of the vehicle drive device of the said 2nd Example. It is the block diagram which showed typically the drive device provided with the oil suction performance improvement type strainer structure of the drive device for vehicles of the said 2nd Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive device 3 Torque converter 5 Multistage automatic transmission 7 Oil pump 7a Pump housing 7b Pump cover 7c Pump gear 7d Oil suction path 7e Air vent hole 9 Oil pan 9a Bottom surface 11 Hydraulic control circuit 13 Strainer 13a Wall part 13b Suction port 13c Nozzle 13d Filter 15 Oil cooler 17 Speed change part 19 Lubricating part 21 Casing 23 Oil retaining part 25 Drain circuit 30 Drive device 32 Front unit 33 Rear unit 34 Converter cover 36 Pump drive shaft 38 Oil seal 40 Output shaft 42 Oil retaining part 42a Drain discharge port 44 Oil passage 46 Seal chamber 48 Oil seal 50 Propeller shaft 52 Drain piping

Claims (3)

Oil pan,
A strainer that is provided in contact with the bottom surface of the oil pan, has a wall portion having an opening communicating with the oil pan, and the wall portion is a baffle;
At least one oil retaining part for retaining a part of the oil sucked by the oil pump through the strainer and supplied into the driving device;
At least one drain circuit for communicating between the oil reservoir and the strainer;
A strainer structure for improving the oil suction performance of a vehicle drive device.   The notch which comprises at least one part of the said opening part was provided in the wall part from the edge part which contact | connects the bottom face of the said oil pan of the said wall part of the said strainer, It is characterized by the above-mentioned. Strainer structure with improved oil suction performance for vehicle drive units.   The strainer structure with improved oil suction performance for a vehicle drive device according to claim 1 or 2, wherein the oil retaining portion is provided in a front unit including the oil pump of the drive device.