JP2009228746A - Transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission improved in drive efficiency by preventing oil returned to an oil pan from staying on a valve body. <P>SOLUTION: A transmission comprises a main case 670 in which a transmission gear housing section 101 housing a drum 691 is regulated, an oil pan 673 which is arranged in a bottom of the main case 670 located under the transmission gear housing section 101, and reserves an oil which is supplied to each section of the drum 691, and returned to the oil pan, and a valve body 260 arranged within a valve body housing chamber 210 regulated by the oil pan 673 and the main case 670. In the valve body 260, an oil channel is formed which penetrates the valve body 260 from upper face to lower face, and returns the oil on the valve body 260 to a bottom of the oil pan. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transmission.

  Conventionally, various types of transmissions and the like have been proposed with respect to transmissions and the like in which air accumulation is suppressed.

  For example, a hydraulic control device for an automatic transmission described in Japanese Patent Application Laid-Open No. 2006-177389 includes a control valve that supplies a control valve output pressure to a friction engagement element. The hydraulic control device branches from the output oil passage of the control valve, communicates with the drain oil passage formed in the lower valve body over the terminal opening on the lower surface of the valve body, and communicates from the drain oil passage to the control valve side, A feedback oil passage that feeds back the control valve output pressure, and a one-way valve that is arranged upstream or downstream of the feedback oil passage and that closes at the control valve output pressure and prevents oil flow from the feedback oil passage side With.

  The hydraulic shock absorber described in Japanese Patent Application Laid-Open No. 2003-254373 has a cylindrical portion in which a joint portion extends laterally from a cylinder tube, a cylindrical socket that protrudes from a tank case, and a cylindrical socket that is tightened to the cylindrical portion side. It is comprised by the hollow volt | bolt which is made to wear and incorporates the damping valve inside. A hollow bolt is screwed into the cylindrical portion from the outside of the cylindrical socket, and the cylindrical socket is sandwiched between the cylindrical portion and the hollow bolt.

  The oil passage constitution block described in Japanese Patent Application Laid-Open No. 2001-140805 includes a plurality of oil passage plates in which passage grooves and ports are formed on the overlapping surface, and these oil passage plates are overlapped to form a laminated block. ing. A plurality of bolt insertion holes are formed in a pair of outermost oil passage plates constituting the outermost layer of the laminated block, and a continuous rib is formed between these bolt insertion holes.

The oil passage constitution block described in JP 2001-140804 A is a laminated block formed by overlapping a plurality of oil passage plates, and the outermost layer oil passage plate forming the outermost layer of the laminated block is used for external piping. In order to attach the joint, a mounting hole formed with a screw on the inner periphery is formed. And between the attachment hole and the port, it is made to continue with the tapered inclined surface toward the port from the attachment hole.
JP 2006-177389 A JP 2003-254373 A JP 2001-140805 A JP 2001-140804 A

  Conventionally, an automatic transmission includes a transmission body provided with a plurality of planetary gears, a housing case for housing the transmission body, an oil pan disposed on the bottom surface side of the housing case, and a valve disposed in the oil pan. With a body.

  In such an automatic transmission, when the oil supplied to the transmission main body is returned to the oil pan, the oil tends to stay on the upper surface of the valve body and hardly returns from the upper surface of the valve body to the bottom side of the oil pan. It was. For this reason, there is a problem that the transmission main body is easily caught by oil, the oil agitation resistance in the transmission main body is increased, and the driving efficiency is lowered.

  On the other hand, in the above Japanese Patent Application Laid-Open No. 2006-177389, etc., the above problems are not mentioned at all, and no specific means for solving the problems is described.

  The present invention has been made in view of the problems as described above, and the object thereof is to prevent the oil returned to the oil pan from staying on the valve body and to improve the driving efficiency. It is to provide a transmission.

  The transmission according to the present invention is disposed in a housing in which a housing chamber for housing the rotating body is defined, and a bottom portion of the housing positioned below the housing chamber, and oil supplied to each part of the rotating body is returned. And an oil pan stored in the valve body housing chamber defined by the oil pan and the housing. The valve body is formed with an oil passage that penetrates from the upper surface to the lower surface of the valve body and returns the oil on the valve body to the bottom of the oil pan. Preferably, the valve body includes a lower bubble body, an upper valve body disposed on the lower valve body, and a fixing member for connecting and fixing the lower valve body and the upper bubble body. The fixing member is inserted into an insertion hole extending from the upper surface to the lower surface of the valve body, and the oil passage is formed in the fixing member, and is a through hole reaching from the upper end to the lower end of the fixing member. Preferably, the opening area of the opening portion of the through hole located at the upper end portion of the fixing member is larger than the oil passage area in the portion of the through hole located on the lower end side of the fixing member with respect to the opening portion. Preferably, the housing is formed with a communication hole that communicates the storage chamber and the oil pan, and the fixing member is provided in a portion of the upper surface of the valve body that is located below the communication hole. Preferably, a cooling circuit including a cooling unit that cools the oil, a supply pipe that is connected to the cooling unit and the casing and supplies oil to the cooling unit, and a return pipe that returns the oil cooled by the cooling unit to the casing. Is further provided. The return pipe is connected to the housing so as to open into the valve body housing chamber, and the fixing member is provided around the opening of the return pipe that opens into the valve body housing chamber on the upper surface of the valve body. It is done.

  According to the transmission according to the present invention, it is possible to improve the driving efficiency by suppressing the oil from staying on the oil pan and reducing the stirring resistance of the rotating body.

A power transmission apparatus according to an embodiment of the present invention will be described with reference to FIGS.
Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential to the present invention unless otherwise specified. In addition, when there are a plurality of embodiments below, it is planned from the beginning to appropriately combine the features of each embodiment unless otherwise specified. The power transmission device in the present embodiment is an automatic transmission of an automobile. The automobile in the present embodiment is an FF automobile in which the engine is disposed on the front side of the vehicle body and the front wheels are drive wheels.

  FIG. 1 is a schematic sectional view of an automatic transmission according to an embodiment of the present invention. FIG. 1 is a schematic cross-sectional view when the automatic transmission is cut along a line II in FIG. 3 to be described later. The automatic transmission includes an input shaft 652 to which a rotational force is input. The rotational force input to the input shaft 652 is transmitted to each gear and output from the drive shafts 666 and 667 as indicated by an arrow 695.

  The automatic transmission includes a rear planetary gear 659, a front planetary gear 658, and a counter drive gear 654 disposed on the axis of the input shaft 652.

  Front planetary gear 658 meshes with a sun gear 710 that is rotatable about input shaft 652, a plurality of pinion gears 730 that mesh with teeth formed on the outer periphery of sun gear 710 and rotate along the outer periphery of sun gear 710, A ring gear 720 is provided on the outer peripheral side of the pinion gear 730 and meshes with each pinion gear 730.

  A rear planetary gear 659 is also provided on a sun gear 711 rotatably provided on the input shaft 652, a plurality of pinion gears 731 that are provided on the outer periphery of the sun gear 711, and meshed with the sun gear 711, and an outer peripheral side of the pinion gear 731. An annular ring gear 721 that meshes with the pinion gear 731 is provided.

  The automatic transmission includes a clutch 400 that switches the gears constituting the rear planetary gear 659 and the front planetary gear 658 to change gears, and a brake 401 and a brake 402 that stop the rotation of the gears.

  The automatic transmission includes a drum 691 connected to the clutch 400 and connected to the input shaft 652. The drum 691 rotates around the rotation center axis O of the input shaft 652, is provided on the outer periphery of the clutch 400, and has a bottomed cylindrical shape.

  The automatic transmission includes a counter driven gear 656 disposed so as to mesh with the counter drive gear 654. On the shaft on which the counter driven gear 656 is disposed, a differential drive pinion 661 is disposed. Differential drive pinion 661 is disposed adjacent to counter driven gear 656.

  The automatic transmission includes a differential 662. The differential 662 includes a link gear 663 as a second gear. Link gear 663 is arranged to mesh with differential drive pinion 661. The differential 662 includes a pinion gear 668 that rotates integrally with the link gear 663. Differential 662 includes a side gear 669 arranged to mesh with pinion gear 668. When the side gear 669 rotates, a rotational force is transmitted to the drive shafts 666 and 667.

  The automatic transmission has an oil pump 665 serving as a first oil pump disposed on the shaft of the input shaft 652. The oil pump 665 is formed so as to suck up oil stored in an oil pan 673 of the main case 670 described later.

  The automatic transmission has a torque converter 664 on the axis of the input shaft 652. Torque converter 664 is formed so as to be able to transmit the rotational force of the engine to input shaft 652.

  FIG. 2 is a schematic exploded perspective view of the transmission housing in the embodiment of the present invention. Referring to FIGS. 1 and 2, the transmission in the present embodiment includes a main case 670. Inside main case 670, planetary gears such as front planetary gear 658 and rear planetary gear 659, and gears such as counter-driven gear 656 and differential 662 are arranged.

  A torque converter housing 671 is disposed at the end of the main case 670 on the engine side. A torque converter 664 is disposed inside the torque converter housing 671. A rear cover 672 is disposed at the end of the main case 670 opposite to the engine side. An oil pan 673 for storing oil is disposed at the bottom on the lower side of the main case 670.

  The oil in the present embodiment is an oil for automatic transmission called ATF (Automatic Transmission Fluid). The oil in the present embodiment functions to drive gears for shifting, transmit torque of the engine in a torque converter, and lubricate to prevent seizure of machine elements such as gears. Have

  FIG. 3 is a front view as seen from the direction of arrow III in FIG. 2 and 3, a transmission gear housing portion 101 and a differential gear housing portion 102 are defined in the main case 670.

  The transmission gear housing 101 is a housing that houses the drum 691, the front planetary gear 658, the rear planetary gear 659, and the like. Of the drum 691, the front planetary gear 658, and the rear planetary gear 659 accommodated in the transmission gear accommodating portion 101, the drum 691 has the largest diameter.

  The transmission gear housing 101 includes an oil pan 673 at the bottom. The oil pan 673 is formed in a box shape whose upper surface is open. The transmission gear housing 101 is formed so that oil can be stored in the bottom.

  The differential gear housing portion 102 is a housing portion that houses, for example, the link gear 663 of the differential 662.

  The bottom of the differential gear housing 102 is formed along the shape of the link gear 663 among the gears of the differential 662. The differential gear housing portion 102 is formed so that oil can be stored at the bottom.

  A main shaft 681 that is an axis of the input shaft 652 is inserted into the transmission gear housing 101. A differential shaft 682 corresponding to the shafts of the drive shafts 666 and 667 connected to the differential 662 is inserted through the differential gear housing portion 102. Above the differential shaft 682, a counter shaft 683 that is the shaft of the counter driven gear 656 and the differential drive pinion 661 is inserted.

  The automatic transmission includes a strainer 674. The strainer 674 removes foreign matters contained in the sucked oil. The strainer 674 has an oil suction port 674a. The suction port 674 a is disposed at the bottom of the oil pan 673. The automatic transmission includes a valve body 260 disposed on the upper side of the strainer 674. The valve body 260 uses hydraulic pressure to switch the engagement state of each gear to control the switching of the gear position.

  The automatic transmission includes an oil cooling circuit 200 that cools oil. The oil cooling circuit 200 is configured to return the oil cooled by the heat exchanger 201 to the automatic transmission, the air-cooled heat exchanger 201, the supply pipe 202 that supplies oil in the automatic transmission to the heat exchanger 201, and the oil. The return pipe 203 is provided.

  4 is a plan view showing a part of the upper surface of the valve body 260, and FIG. 5 is a front view of the transmission when viewed from the direction of the arrow V shown in FIG. FIG.

  As shown in FIGS. 4 and 5, the oil pan 673 is disposed below the transmission gear housing 101 in which the sun gears 710 and 711, the ring gears 720 and 721, the pinion gears 730 and 731, the drum 691, and the like are housed. .

  In the main case 670, the storage chamber defining wall 208 that defines the transmission gear housing 101 is curved in an arc shape along the shape of the gear train to be housed. The oil pan 673 is connected to the lower end portion of the main case 670 with a bolt or the like, and the valve case housing chamber 210 that houses the strainer 674 and the valve body 260 is defined by the main case 670 and the oil pan 673. .

  An opening 207 for communicating the transmission gear housing 101 and the valve body housing chamber 210 and discharging oil in the transmission gear housing 101 to the valve body housing chamber 210 is formed at the bottom of the housing chamber defining wall 208. Is formed.

  Then, oil used for lubrication and cooling of the sun gears 710 and 711, the ring gears 720 and 721, the pinion gears 730 and 731 and the like enters the valve body housing chamber 210 through the opening 207 and flows down on the upper surface of the valve body 260. To do.

  A strainer 674 is disposed on the lower surface side of the valve body 260. The strainer 674 sucks oil stored at the bottom of the oil pan 673, removes foreign matter contained in the oil, and then supplies the oil to the valve body 260. ing.

  The valve body 260 includes a lower valve body 262, an upper valve body 261 fixed on the upper surface of the lower valve body 262, and a plurality of bolts with holes (first bolts) for connecting and fixing the upper valve body 261 and the lower valve body 262. 1 fixing member) 250.

  On the upper surface of the valve body 260, an opening of an oil passage disposed in the valve body 260 is located. In FIG. 4, an oil passage wall portion 265 that hangs downward from the main case 670 is connected to the upper surface of the valve body 260. A plurality of oil passages 206 are formed in the oil passage wall portion 265 and connected to the opening portion of the oil passage that opens on the upper surface of the valve body 260.

  The oil passage wall portion 265 is connected to the vicinity of the outer peripheral edge portion of the upper surface of the valve body 260. The bolt 250 with a hole is located on the opposite side of the outer peripheral edge portion of the upper surface of the valve body 260 with respect to the oil passage wall portion 265. The bolt with hole 250 reaches the lower surface from the upper surface of the valve body 260 and is inserted into the through hole 266 shown in FIG.

  FIG. 6 is a cross-sectional view of the bolt with hole 250. As shown in FIG. 6, the bolt with hole 250 includes a shaft portion 251 having a screw portion formed on the outer surface, and a head portion 252 formed on the upper end portion of the shaft portion 251. A through-hole 255 that extends from the upper end surface of the head portion 252 to the lower end portion of the shaft portion 251 is formed in the bolt with hole 250.

  The head portion 252 is connected to the head hole portion 253 formed so that the inner diameter increases toward the upper end surface of the head portion 252, and the lower end portion of the head hole portion 253, and is formed in the head portion 252. The shaft hole portion 254 is provided.

  The opening area S of the head portion 252 is formed to be larger than the oil circulation area T in the shaft hole portion 254. The opening area S is formed to be larger than the flow area of the other part of the through hole 255.

  As shown in FIG. 5, a bolt with a hole 250 is attached to the valve body 260 so that the head portion 252 is positioned on the upper surface of the valve body 260. For this reason, the opening of the head hole 253 formed in the bolt with hole 250 opens on the upper surface of the valve body 260.

  The oil that has flowed down on the upper surface of the valve body 260 enters the head hole 253, passes through the shaft hole 254, and flows down to the bottom of the oil pan 673.

  As described above, since oil can be prevented from staying above the valve body 260, the oil staying above the valve body 260, the sun gears 710 and 711, the ring gear housed in the transmission gear housing 101, and the ring gear. 720, 721, pinion gears 730, 731 and drum 691 can be prevented from coming into contact with each other.

  As a result, the oil agitation resistance of the sun gears 710 and 711, the ring gears 720 and 721, the pinion gears 730 and 731 and the drum 691 can be reduced, and the drive efficiency can be improved.

  In particular, the holed bolt 250 is provided in a region R <b> 1 located below the opening 207 in the upper surface of the valve body 260. For this reason, the oil flowing down from the opening 207 immediately enters the through hole 255 of the holed bolt 250 positioned below the opening 207 and is guided toward the bottom of the oil pan 673. The lower end of the bolt with hole 250 located below the opening 207 is located above the upper surface of the strainer 674. For this reason, the oil that has flowed down through the through hole 255 of the bolt with hole 250 is guided to the bottom of the oil pan 673 along the upper surface of the strainer 674.

  By causing the oil on the valve body 260 to sequentially flow down to the oil pan 673, it is possible to suppress an increase in pressure in a portion of the valve body housing chamber 210 located above the valve body 260 and the transmission gear housing portion 101. . As a result, blister blowing can be reduced in the blister circuit provided in the transmission.

  A discharge port 211 that opens into the valve body storage chamber 210 is formed on the side surface of the main case 670, and a return pipe 203 is connected to the discharge port 211. The oil cooled by the heat exchanger 201 is supplied into the valve body housing chamber 210 through the discharge port 211.

  Since the oil pan 673 is detachably attached to the main case 670, the return pipe 203 is generally not connected to the oil pan 673 but connected to the main case 670.

  For this reason, the discharge port 211 is located above the valve body 260, and the oil supplied from the discharge port 211 into the valve body housing chamber 210 is discharged toward the upper surface of the valve body 260.

  Here, a holed bolt 250 is arranged in a region R <b> 2 located around the discharge port 211 on the upper surface of the valve body 260. For this reason, the oil discharged from the discharge port 211 immediately flows through the through hole 255 of the holed bolt 250 to the bottom of the oil pan 673. Thereby, oil can be prevented from staying above the valve body 260.

  Here, the valve body 260 is inclined downwardly from the valve body housing chamber 210 side toward the differential gear housing portion 102 side. For this reason, the oil that has flowed into the valve body housing chamber 210 from the opening 207 from the region R1 located below the opening 207 in the upper surface of the valve body 260 to the region R3 located on the differential gear housing 102 side. It flows toward.

  For this reason, oil can be prevented from staying in the upper surface of the valve body 260 and below the opening 207, and the sun gears 710 and 711, the ring gears 720 and 721, the pinion gears 730 and 731, and the drum 691. And the oil can be prevented from coming into contact with each other, and the driving efficiency can be improved.

  The holed bolt 250 is attached to the valve body 260 in a region R3 located on the differential gear housing portion 102 side of the upper surface of the valve body 260. For this reason, the oil flowing on the upper surface of the valve body 260 can be effectively guided to the bottom of the oil pan 673.

  The opening of the through hole 255 formed at the upper end of the holed bolt 250 is formed to be larger than the other part of the through hole 255, and can receive oil well. Furthermore, since the opening area is large, the area of the oil level received in the head hole 253 is also increased. Thus, for example, the pressure with which oil is pressed toward the bottom of the oil pan 673 can be increased by the wind pressure generated by the rotation of the sun gears 710 and 711, the drum 691, and the like. The oil that has entered the head hole 253 flows through the shaft hole 254 well and flows down toward the bottom of the oil pan 673.

  In addition, the diameter of the opening part of the through-hole 255 formed in the head part 252 is about 2 mm or more and 3 mm or less, for example.

  Then, the size of the oil circulation area in the head hole 253 is made smaller toward the shaft part 251, and the oil circulation area in the shaft hole 254 is made smaller than the opening area of the head hole 253. Thus, the rigidity of the bolt with hole 250 can be secured, and the tightening force between the upper valve body 261 and the lower valve body 262 can be secured.

  As a fixing member for fastening the upper valve body 261 and the lower valve body 262, in addition to the bolts with holes 250, a normal solid bolt 240 is also employed. Such bolts 240 are used in portions of the upper surface of the valve body 260 other than the regions R1, R2, and R3. The diameter of the bolt 240 is smaller than the diameter of the holed bolt 250, and the valve body 260 can be made compact.

  In this embodiment, the oil on the valve body 260 is guided to the bottom of the oil pan 673 by forming a through hole in the bolt that fastens the upper valve body 261 and the lower valve body 262. However, it is not limited to this. For example, a through hole that extends from the upper surface to the lower surface of the valve body 260 may be formed.

  As in the transmission according to the present embodiment, by employing the bolts with holes 250, the valve body 260 can be made more compact as compared with the case where the above through holes are newly provided. it can.

  In addition, although this Embodiment demonstrated the example applied to the automatic transmission, it is applicable also to a continuously variable transmission etc.

  Although the embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. Furthermore, the above numerical values are examples, and are not limited to the above numerical values and ranges.

  The present invention is suitable for a transmission.

It is a schematic sectional drawing of the automatic transmission in embodiment of this invention. 1 is a schematic exploded perspective view of a transmission housing in an embodiment of the present invention. FIG. It is the front view seen from the III arrow direction in FIG. It is a top view which shows a part of upper surface of a valve body. It is the front view of a transmission when it sees from the arrow V direction shown in FIG. 4, Comprising: It is the front view which looked at a part in cross section. It is sectional drawing of a bolt with a hole.

Explanation of symbols

  210 Valve body accommodating chamber, 250 bolt with hole, 251 shaft part, 252 head part, 253 head hole part, 254 shaft hole part, 255 through hole, 260 valve body, 261 upper valve body, 262 lower valve body, 265 oil passage Wall.

Claims (5)

A housing in which a storage chamber for storing the rotating body is defined;
An oil pan disposed at the bottom of the housing located below the storage chamber and storing the oil supplied to each part of the rotating body returned;
A valve body disposed in a valve body housing chamber defined by the oil pan and the housing;
With
A transmission in which the valve body is formed with an oil passage that penetrates from the upper surface to the lower surface of the valve body and returns the oil on the valve body to the bottom of the oil pan. The valve body includes a lower bubble body, an upper valve body disposed on the lower valve body, and a fixing member for connecting and fixing the lower valve body and the upper bubble body,
The fixing member is inserted into an insertion hole that extends from the upper surface to the lower surface of the valve body, and the oil passage is a through hole that is formed in the fixing member and reaches the lower end from the upper end of the fixing member. The transmission as described in.   The opening area of the opening of the through hole located at the upper end of the fixing member is greater than the flow area of the oil in the portion of the through hole located on the lower end side of the fixing member with respect to the opening. The transmission of claim 2, wherein the transmission is large. The housing is formed with a communication hole that communicates the storage chamber and the oil pan.
The transmission according to claim 2 or 3, wherein the fixing member is provided in a portion of the upper surface of the valve body located below the communication hole. A cooling unit that cools the oil, a supply pipe that is connected to the cooling unit and the casing and supplies the oil to the cooling unit, and a return pipe that returns the oil cooled by the cooling unit to the casing A cooling circuit including
The return pipe is connected to the housing so as to open into the valve body accommodation chamber,
The transmission according to any one of claims 2 to 4, wherein the fixing member is provided around an opening portion of the return pipe that opens into the valve body housing chamber on an upper surface of the valve body.

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