JP2011033153A - Lubrication structure of continuously variable transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubrication structure of a continuously variable transmission capable of reducing the number of parts and assembly man-hour. <P>SOLUTION: In this lubrication structure of the continuously variable transmission for supplying lubricating oil (lubricating oil for the continuously variable transmission) into a variable speed mechanism 20 having a driving pulley (a primary pulley 21) in which driving force is input and a driven pulley (a secondary pulley 22) connected with the driving pulley 21 through an endless belt 23 through an oil filter (a sub-oil filter F2), an oil passage (an oil passage 9 for the variable speed mechanism) in which lubricating oil flows is provided in a transmission case (a transmission case 8a) storing the variable speed mechanism 20 and is communicated with a filter chamber 50 storing the oil filter F2 and having an opening 51 being openable on an inner side surface 8c of the transmission case 8a. The opening 51 of the filter chamber 50 is blocked by a lid member 56 provided with a supply pipe 57 for supplying lubricating oil into the variable speed mechanism 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lubricating structure for a continuously variable transmission that supplies oil circulating in a transmission case to an continuously variable transmission mechanism via an oil filter.

  Conventionally, a lubrication structure for a continuously variable transmission in which oil discharged from an oil pump through a control valve unit is sequentially passed through an oil cooler and an oil filter and then sprayed onto an endless belt of a continuously variable transmission mechanism as V-belt lubricating oil. Is known (see, for example, Patent Document 1).

  In this conventional continuously variable transmission lubrication structure, the oil discharged from the control valve unit passes through the oil passages formed in the transmission case and the side cover in order and passes through the outer pipe provided on the outer side of the side cover. It passes through an oil passage formed in the side cover again through an oil cooler and an oil filter provided in the cover. Further, this oil passes through an oil passage formed in the transmission case and an oil passage formed in the converter housing in order, and is supplied to an injection nozzle provided in the converter housing and extended to a position facing the V belt. Sprayed toward.

JP 2003-106415 A

  By the way, in the lubrication structure of the conventional continuously variable transmission, the oil path from the oil filter to the injection nozzle is long, and the lid member that closes the opening of the oil path in which the oil filter is stored, and the support member for the injection nozzle And had to be provided separately. Therefore, there has been a problem that the number of parts increases.

  Moreover, since the said cover member and the support member are separate, those assembly | attachment operations became two processes and there were many assembly steps.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide a lubricating structure for a continuously variable transmission that can reduce the number of parts and the number of assembly steps.

  In order to achieve the above object, according to the present invention, lubricating oil is supplied to a continuously variable transmission mechanism having a driving pulley to which driving force is input and a driven pulley connected to the driving pulley via an endless belt via an oil filter. In the lubrication structure of the continuously variable transmission to be supplied, an oil path through which the lubricating oil flows is provided in a transmission case that houses the continuously variable transmission mechanism, and the oil path houses the oil filter and the transmission. It communicates with a filter chamber having an opening opened on the inner surface of the case, and the opening of the filter chamber is closed by a lid member provided with a supply pipe for supplying the lubricating oil to the continuously variable transmission mechanism. Features.

Therefore, in the lubrication structure of the continuously variable transmission according to the present invention, the supply of lubricating oil to the continuously variable transmission mechanism is accommodated through the opening of the filter chamber in which the oil filter is accommodated and the oil passage through which the lubricating oil flows It is closed by a lid member provided with a tube.
Accordingly, the supply pipe can be attached to the transmission case while the oil filter is fixed in the filter chamber by the lid member. That is, the function of fixing the oil filter and the function of attaching the supply pipe can be shared by the lid member. As a result, the number of parts can be reduced.
In addition, since the supply pipe can be assembled by attaching the lid member to the opening of the filter chamber, the fixing work of the oil filter and the assembly work of the supply pipe are performed at the same time. Reduction can be achieved.

1 is a system diagram schematically illustrating a power train to which a lubricating structure for a continuously variable transmission according to a first embodiment is applied. FIG. FIG. 3 is a circuit diagram schematically showing a hydraulic circuit in the lubricating structure of the continuously variable transmission according to the first embodiment. It is a side view of a transmission case. It is AA sectional drawing in FIG. It is a perspective view which shows a sub oil filter, a filter holding frame, and a cover member.

  Hereinafter, a mode for carrying out a lubricating structure for a continuously variable transmission according to the present invention will be described based on a first embodiment shown in the drawings.

First, the configuration will be described.

  The power train shown in FIG. 1 includes an engine 1 that is a driving source, a torque converter 2 that is drivingly coupled to the engine 1, an automatic transmission (continuously variable transmission) 3 that is drivingly coupled to the torque converter 2, The automatic transmission 3 has wheels 6 and 6 from which power is output via a drive shaft 6a. The automatic transmission 3 includes a continuously variable transmission control unit 7a that controls a continuously variable transmission mechanism 20 described later, and a stepped transmission control unit 7b that controls a stepped transmission mechanism 30 described later. The shift is controlled by. The automatic transmission 3 has a transmission mechanism TM accommodated in the transmission case 8.

  As shown in FIG. 1, the transmission mechanism TM includes a transmission gear mechanism 10, a continuously variable transmission mechanism 20, a stepped transmission mechanism 30, and a final drive gear mechanism 40.

  The transmission gear mechanism 10 includes a drive gear 11 attached to the output shaft 2 a of the torque converter 2 and a driven gear 12 attached to the input shaft of the primary pulley 21 of the continuously variable transmission mechanism 20. The gear ratio is arbitrarily set depending on the gear ratio between the drive gear 11 and the driven gear 12.

  The continuously variable transmission mechanism 20 includes a primary pulley (drive pulley) 21 to which a driven gear 12 is attached and power is input from the transmission gear mechanism 10, and a secondary pulley (output shaft is drivingly coupled to the stepped transmission mechanism 30. This is an existing belt type continuously variable transmission mechanism having a driven pulley 22 and an endless belt 23 stretched between the pulleys 21 and 22. The primary pulley 21 and the secondary pulley 22 are supplied with oil, and the pulley width can be freely changed according to the oil pressure. Thereby, the continuously variable transmission mechanism 20 can change the gear ratio steplessly by controlling the hydraulic pressure supplied to the primary pulley 21 and the hydraulic pressure supplied to the secondary pulley 22.

  The stepped transmission mechanism 30 drives the secondary pulley 22 of the continuously variable transmission mechanism 20 to the composite sun gear 31 of the Ravigneaux planetary gear mechanism so that the composite sun gear 31 is input, while the carrier 32 is connected to the transmission output shaft 4. The carrier 32 is used as an output. The composite sun gear 31 is fixed to the transmission case 8 via a low brake (first speed selection brake) L / B, and the carrier 32 is ringed via a high clutch (second speed selection clutch) H / C. Drive coupled to the gear 33. Further, the ring gear 33 is fixed to the transmission case 8 via a reverse brake R / B.

  The stepped transmission mechanism 30 can supply oil to the low brake L / B, the high clutch H / C, and the reverse brake R / B, respectively, and can freely engage and disengage according to the supplied hydraulic pressure. Can do. Thereby, the stepped transmission mechanism 30 can select the first forward speed, the second forward speed, and the first reverse speed.

In the case of the first forward speed, only the low brake L / B is engaged. In the case of the second forward speed, only the high clutch H / C is engaged. Furthermore, in the case of the reverse first speed, only the reverse brake R / B is engaged. Table 1 shown below shows the relationship between fastening and releasing when controlling the stepped transmission mechanism 30. In the table, ○ indicates fastening and × indicates release.

  Then, when shifting is performed by the stepped transmission mechanism 30, the shift shock is suppressed by executing cooperative control with the continuously variable transmission mechanism 20.

  The final drive gear mechanism 40 includes a drive gear 41 attached to the transmission output shaft 4 and a driven gear 42 attached to the drive shaft 6 a connected to the wheels 6 and 6. The reduction ratio is arbitrarily set according to the gear ratio between the drive gear 41 and the driven gear 42.

  The transmission mechanism TM is supplied with oil via a control valve unit CVU. FIG. 2 schematically shows a hydraulic circuit in the automatic transmission 3. That is, when the oil pump 70 is driven by the rotation of the output shaft 2a of the torque converter 2, the oil accumulated in the oil pan 71 is sucked into the oil pump 70 via the strainer 70a and supplied to the control valve unit CVU. The oil supplied to the control valve unit CVU is adjusted to an appropriate hydraulic pressure, and the primary pulley 21, secondary pulley 22, low brake L / B, high clutch H / C, reverse brake R / B, torque converter hydraulic pressure Chamber (torque converter release pressure chamber) 2b and lockup hydraulic chamber (torque converter applier chamber) 2c.

  The excess oil that is not supplied from the control valve unit CVU to each pulley or the like is supplied to the oil cooler C and cooled by a cooling medium such as cooling water. The oil cooled by the oil cooler C is supplied to the main oil filter F1 through an oil passage Y formed in the transmission case 8, and contaminants such as spatter and cutting waste are removed by the main oil filter F1. The Part of the oil from which foreign substances have been removed flows through the in-case lubricating oil passage 9A as the in-case lubricating oil and is sprayed to various locations inside the transmission case 8, and a part of the continuously variable transmission mechanism lubricating oil (lubricating oil) ) Flows through the oil passage (oil passage) 9 for the continuously variable transmission mechanism and is sprayed onto the continuously variable transmission mechanism 20 through the sub oil filter (oil filter) F2.

  Here, the oil passage 9 for the continuously variable transmission mechanism is formed in a transmission case 8a that forms the transmission case 8 shown in FIG. That is, the continuously variable transmission mechanism oil passage 9 communicates with the filter recess 8b that houses the main oil filter F1, and also passes through the transmission case 8a and communicates with the filter chamber 50 that houses the sub oil filter F2. (See FIG. 4).

  As shown in FIG. 4, the filter chamber 50 is a recess having an opening 51 opened on the inner surface (a surface facing the continuously variable transmission mechanism 20, see FIG. 3) 8c of the transmission case 8a. Between the pulley 22 and in the vicinity of the endless belt 23. A step portion 50 a is formed on the inner peripheral surface of the filter chamber 50 so as to abut a filter holding frame 52 described later. In other words, the inner diameter of the filter chamber 50 is gradually reduced from the opening 51 by the step portion 50a.

  The sub oil filter F <b> 2 is accommodated in the filter chamber 50 while being held by the filter holding frame 52. As shown in FIG. 5, the filter holding frame 52 has a hollow cylindrical shape with one open end, a small-diameter frame 53 in which a plurality of oil inflow openings 53 a are formed on the peripheral surface, and an opening of the frame 53. And a large-diameter cylindrical fitting portion 54 integrally formed at the end portion. An O-ring 54 a is provided on the outer periphery of the fitting portion 54. Thereby, when the filter holding frame 52 is inserted into the filter chamber 50 and the fitting portion 54 hits the stepped portion 50a, oil leakage from the opening 51 is prevented by the O-ring 54a.

  The opening 51 of the filter chamber 50 in which the filter holding frame 52 is inserted is closed by a lid member 56. The lid member 56 includes a fitting portion 56a that fits into the opening 51 of the filter chamber 50, and a flange portion 56b that is provided at the peripheral edge of the fitting portion 56a and contacts the inner surface 8c of the transmission case 8a. ing.

  The fitting portion 56 a has a cylindrical shape that is in close contact with the inner surface of the opening 51, and a supply pipe 57 that supplies lubricating oil to the continuously variable transmission mechanism 20 is integrally provided at the center. The supply pipe 57 is a tubular body bent at the middle, passes through the fitting portion 56 a, and communicates with the inside of the filter holding frame 52. Further, a discharge port 57a is formed at the tip of the supply pipe 57 so that the lubricating oil can be ejected in the form of a mist. The discharge port 57a is disposed in the vicinity of the endless belt 23 and is directed to the contact surface between the secondary pulley 22 and the endless belt 23 (see FIG. 3).

  The flange portion 56b has an extension flange portion 58 that contacts the inner surface 8c of the transmission case 8a and adjusts the center of gravity of the lid member 56, and a screw through hole 59 through which the fixing screw N1 passes. The extension flange portion 58 projects to the opposite side of the supply pipe 57 from the discharge port 57 a, and prevents an inclination generated in the lid member 56 due to the weight of the supply pipe 57.

  The lid member 56 is fixed to the transmission case 8a by a fixing screw N1. A screw portion (not shown) into which the fixing screw N1 is screwed is formed on the inner surface 8c of the transmission case 8a. 5 is a washer interposed between the fixing screw N1 and the flange portion 56b.

Next, the operation will be described.
The operation of the lubrication structure of the continuously variable transmission according to the first embodiment will be described by dividing it into “the number of parts reduction operation” and “the assembly man-hour reduction operation”.

[Parts reduction]
In the automatic transmission 3 according to the first embodiment, the continuously variable transmission mechanism oil passage 9 through which the continuously variable transmission mechanism lubricating oil flows communicates with the filter chamber 50 in which the sub oil filter F2 is accommodated. Is closed by the lid member 56 provided.

  Thus, in the automatic transmission 3 according to the first embodiment, the filter holding frame 52 for holding the sub oil filter F2 is fixed in the filter chamber 50 by the lid member 56, and at the same time, the supply pipe 57 is attached to the transmission case 8a. Can be executed.

  In other words, the lid member 56 can be used for both the fixing function of the sub oil filter F2 and the mounting function of the supply pipe 57. As a result, the number of parts can be reduced.

[Assembling man-hour reduction action]
In the automatic transmission 3 according to the first embodiment, to attach the sub oil filter F2 to the transmission case 8, first, the sub oil filter F2 is inserted into the filter holding frame 52, and the sub oil filter F2 is held by the filter holding frame 52. Let

  Next, the filter holding frame 52 is inserted into the filter chamber 50 formed in the transmission case 8a. At this time, the filter holding frame 52 is inserted until the fitting portion 54 hits the stepped portion 50 a in the filter chamber 50.

  Then, with the fitting portion 56a of the lid member 56 fitted into the opening 51 and the flange portion 56b being in contact with the inner surface 8c of the transmission case 8a, the lid member 56 is attached to the transmission case 8a by the fixing screw N1. Installing. Here, since the supply pipe 57 is provided integrally with the lid member 56, the attachment of the supply pipe 57 to the transmission case 8a is completed simultaneously with the attachment of the sub oil filter F2 to the transmission case 8.

  Thus, by attaching the lid member 56 to the transmission case 8a, the filter holding frame 52 for holding the sub oil filter F2 can be fixed and the supply pipe 57 can be attached to the transmission case 8a at the same time. That is, the fixing operation of the sub oil filter F2 and the assembling operation of the supply pipe 57 are performed at the same time, and the assembling man-hour can be reduced. The fitting portion 56 a has a convex shape that protrudes toward the opening 51.

  In particular, in the automatic transmission 3 according to the first embodiment, the lid member 56 has an extension flange portion 58 that contacts the inner surface 8c of the transmission case 8a and adjusts the center of gravity of the lid member 56. For this reason, even when the fitting portion 56a is just fitted into the opening 51, that is, before the lid member 56 is fixed with the fixing screw N1, the lid member 56 is in a stable state with respect to the transmission case 8a. Can be installed. As a result, the assembly work can be easily performed without being displaced before being fixed by the fixing screw N1.

  In the automatic transmission 3 according to the first embodiment, the lid member 56 includes the fitting portion 56a that fits the convex shape into the opening 51 of the filter chamber 50. The positioning of the lid member 56 can be easily performed, and the assembling workability can be improved. Further, since the contact area between the lid member 56 and the inner peripheral surface of the filter chamber 50 can be increased, the effect of preventing oil leakage from the opening 51 can be enhanced. In particular, when a sealing member such as an O-ring is provided on the outer peripheral surface of the fitting portion 56a, the effect of preventing oil leakage can be further enhanced.

  Further, by inserting the fitting portion 56a into the opening 51, it is possible to prevent the lid member 56 from rotating around the fixing screw N1 after the lid member 56 is fixed to the transmission case 8a by the fixing screw N1.

  In the automatic transmission 3 according to the first embodiment, the sub oil filter F2 is inserted into the filter holding frame 52. The filter holding frame 52 is inserted into the filter chamber 50 and fixed by the lid member 56. Yes. That is, the sub oil filter F2 can be removed from the transmission case 8 by removing the fixing screw N1, removing the lid member 56 from the transmission case 8a, and taking out the filter holding frame 52 from the filter chamber 50.

  Thus, since the cover member 56 and the sub oil filter F2 are detachably provided to the transmission case 8, the used sub oil filter F2 can be easily replaced.

  Further, in the automatic transmission 3 according to the first embodiment, the filter chamber 50 and the discharge port 57 a of the supply pipe 57 are disposed in the vicinity of the endless belt 23. Thereby, the supply pipe | tube 57 can be shortened and it becomes advantageous to the handling of oil piping.

  When the oil passage from the sub oil filter F2 to the supply pipe 57 is long, it is difficult to form the oil passage integrally, and it is necessary to divide the oil passage in the middle. In that case, in order to prevent oil leakage from the divided portion, it must be assembled via an oil seal, and there is a possibility that a deviation or an error may occur when the oil passage is formed.

  On the other hand, by disposing the filter chamber 50 and the discharge port 57a of the supply pipe 57 in the vicinity of the endless belt 23, the supply pipe 57 is not divided in the middle, and the occurrence of oil leakage or deviation at the time of oil passage formation is prevented. Etc. will not occur.

Next, the effect will be described.
In the lubricating structure of the continuously variable transmission according to the first embodiment, the effects listed below can be obtained.

  (1) An oil filter (primary pulley 21) to which a driving force is input and a continuously variable transmission mechanism 20 having a driven pulley (secondary pulley 22) connected to the driving pulley 21 via an endless belt 23 are provided with an oil filter ( In a continuously variable transmission lubrication structure for supplying lubricating oil (continuously variable transmission mechanism lubricating oil) via a sub-oil filter F2), the transmission case (transmission case 8a) housing the continuously variable transmission mechanism 20 includes An oil passage (oil passage 9 for continuously variable transmission mechanism) through which lubricating oil flows is provided, and the oil passage 9 accommodates the oil filter F2 and has an opening 51 opened on the inner surface 8c of the transmission case 8a. The opening 51 of the filter chamber 50 communicates with the filter chamber 50 by a lid member 56 provided with a supply pipe 57 for supplying the lubricating oil to the continuously variable transmission mechanism 20. It was configured to close. For this reason, while reducing a number of parts, an assembly man-hour can be reduced.

  (2) The lid member 56 and the oil filter F2 are configured to be detachable from the transmission case 8a. For this reason, the used sub oil filter F2 can be easily replaced.

  (3) The lid member 56 includes an extension flange portion 58 that adjusts the center of gravity of the lid member 56, and a fixing tool (fixing screw) for fixing the lid member 56 to the lid member 56. N1) is formed so as to form a hole (screw through hole). For this reason, before the lid member 56 is fixed by the fixing screw N1, the lid member 56 is not displaced during the assembly work, and further after the lid member 56 is placed on the inner surface 8c of the transmission case 8a. The operator can also release his hand, and the assembly work can be easily performed.

  (4) The lid member 56 has a convex fitting portion 56 a that fits into the opening 51 of the filter chamber 50. For this reason, at the time of the assembling work of the lid member 56, the positioning of the lid member 56 can be easily performed, and the assembling workability can be improved. In addition, the contact area between the lid member 56 and the inner peripheral surface of the filter chamber 50 can be increased, and the effect of preventing oil leakage from the opening 51 can be enhanced. Furthermore, by inserting the fitting portion 56a into the opening 51, it is possible to prevent the lid member 56 from rotating around the fixing screw N1 after the lid member 56 is fixed to the transmission case 8a with the fixing screw N1.

  (5) The filter chamber 50 and the discharge port 57a of the supply pipe 57 are arranged in the vicinity of the endless belt 23. Thereby, the supply pipe | tube 57 can be shortened and it becomes advantageous to the handling of oil piping.

  The lubricating structure of the continuously variable transmission according to the present invention has been described based on the first embodiment. However, the specific configuration is not limited to the first embodiment, and each claim of the claims Design changes and additions are allowed without departing from the gist of the invention.

  In the automatic transmission 3 according to the first embodiment, the filter chamber 50 that accommodates the sub oil filter F2 is formed in the transmission case 8a. For example, a side cover that covers the transmission case 8a and a converter housing to which the torque converter 2 is mounted. Or you may form in the wall surface etc. which divide | segment the inside of the transmission case 8. FIG. That is, the filter chamber 50 may be formed in any part of the transmission case 8 as long as the filter chamber 50 has the opening 51 on the inner surface facing the continuously variable transmission mechanism 20.

8 Transmission case 8a Transmission case 8c Inner surface 9 Oil passage (oil passage for continuously variable transmission mechanism)
20 continuously variable transmission mechanism 21 drive pulley (primary pulley)
22 Driven pulley (secondary pulley)
23 Endless belt 50 Filter chamber 51 Opening 56 Lid member 56a Fitting part 56b Flange part 57 Supply pipe 57a Discharge port 58 Extension flange part F2 Oil filter (sub oil filter)

Claims (6)

In a lubricating structure of a continuously variable transmission for supplying lubricating oil via an oil filter to a continuously variable transmission mechanism having a driving pulley to which a driving force is input and a driven pulley connected to the driving pulley via an endless belt,
An oil passage through which the lubricating oil flows is provided in a transmission case that houses the continuously variable transmission mechanism,
The oil passage accommodates the oil filter and communicates with a filter chamber having an opening opened on an inner surface of the transmission case.
An opening of the filter chamber is closed by a lid member provided with a supply pipe for supplying the lubricating oil to the continuously variable transmission mechanism. In the lubricating structure of the continuously variable transmission according to claim 1,
The continuously variable transmission lubrication structure, wherein the lid member and the oil filter are detachably attached to the transmission case. In the lubricating structure of the continuously variable transmission according to claim 1 or 2,
The continuously variable transmission lubrication structure, wherein the lid member has an extension flange portion for adjusting the center of gravity of the lid member. In the lubricating structure of the continuously variable transmission according to any one of claims 1 to 3,
The lid member is provided with a hole for penetrating a fixture for fixing the lid member, and is a lubricating structure for a continuously variable transmission. In the lubricating structure of the continuously variable transmission according to any one of claims 1 to 4,
The continuously variable transmission lubrication structure, wherein the lid member has a fitting portion that fits into an opening of the filter chamber. In the lubricating structure of the continuously variable transmission according to any one of claims 1 to 5,
The lubrication structure of a continuously variable transmission, wherein the filter chamber and the discharge port of the supply pipe are arranged in the vicinity of the endless belt.

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