JP2007187245A - Gear transmission - Google Patents

Abstract

To provide a shift switching device capable of simplifying the formation of a hydraulic oil supply oil passage to a hydraulic actuator in an AMT in which a gear stage of a constantly meshing gear transmission is switched by a hydraulic actuator.
A shift rod for shifting a sleeve of a synchronous switching device is pivotally supported at both end portions by case-side shaft support portions 50 and 60, and a pair of hydraulic actuators are integrally formed. The shift rod is a hollow shaft, and the hydraulic oil supply oil passages 32h and 32i to the pair of hydraulic actuators can be provided only on the one-side shaft support portion 50 side by making the hollow hole an oil passage to the other-side actuator. This makes it possible to simplify the formation of an oil passage to the actuator on the case side.
[Selection] Figure 2

Description

  The present invention relates to a gear shifting operation of a gear transmission configured to be always meshed, and more particularly, to a gear transmission in which a shift stage is switched by an actuator.

  An input shaft provided with a plurality of drive gears, and an output shaft provided parallel to the input shafts and provided with a plurality of driven gears that mesh with the drive gears. A manual gear transmission that performs a shift by selecting a shift stage that transmits power from a plurality of shift gear trains formed between them by a shift operation of the driver, the shift operation is performed according to a change in a running state during the operation. Because it is required, the burden on the driver is large.

  Therefore, in the gear transmission as described above, there is an automatic gear transmission (AMT) in which the shift operation for switching the gear stage is performed by a hydraulic actuator or the like, and the operation of the actuator or the like is automated to perform automatic gear shifting. Has been developed. For example, see JP-A-2004-138241.

  In the transmission described in this document, a shift fork that shifts a synchronous switching device (synchronizer) in order to switch a shift stage is a shift rod (corresponding) supported on a fixed shaft provided in the transmission case. A cylinder (cylindrical end) of a hydraulic actuator is provided at both ends of the shift rod member, and can be changed by controlling the supply of hydraulic oil to the cylinder. Thus, the shift operation device is configured.

JP 2004-138241 A

  Here, hydraulic oil is supplied to the two cylinders (cylindrical end portions) disposed at both ends of the shift rod member from oil passages (flow paths) opened at the end portions of the fixed shaft that supports the shift rod member. The oil passage (flow passage) must be connected to the oil passage (actuator solenoid portion) by providing an oil passage in the transmission case or the like. When the discharge port of the hydraulic oil supply part (actuator solenoid part) is placed close to the cylinder (cylindrical end part) of the one side actuator, the oil path length to the other side cylinder (cylindrical end part) is Inevitably longer.

  It is difficult to form a long oil passage on the transmission case side. For example, when an oil passage is provided by drilling, deep hole machining is required, resulting in an increase in processing costs and securing a space for forming the oil passage. Therefore, the case thickness increases, that is, the weight increases. In addition, when the oil passage is formed across a plurality of cases, a problem of oil leakage from the oil passage is likely to occur, and there arises a problem that this countermeasure is necessary.

  The present invention has been made in view of the above problems, and in a gear transmission in which a shift shift is performed by an actuator or the like, an oil to a hydraulic actuator of a shift rod that shifts a synchronous switching device that switches a shift stage is provided. An object of the present invention is to provide a shift operation device for a gear transmission that simplifies a road configuration, suppresses an increase in case weight, and does not require a countermeasure for sealing.

A gear transmission according to the present invention shifts an input shaft including a plurality of drive gears, an output shaft including a driven gear that meshes with the drive gears to form a plurality of shift gear trains, and shifts the shift gear trains. And a shift operation device that is arranged to be reciprocally movable in the axial direction on the side of a transmission case that houses the transmission gear train, and operates the synchronization switching device between a shift position and a neutral position. In a gear transmission comprising:
The shift operation device is formed integrally with a pair of hydraulic actuators that shift-drive the shift rods in directions facing each other on both shaft support portions of a shift rod that is pivotally supported on both ends of the transmission case. An oil passage is communicated from the shaft support portion on the side to the hydraulic actuator on the other side via the shift rod, and hydraulic oil is supplied to the pair of hydraulic actuators via the one side shaft support portion of the shift rod. It is characterized by being configured.

  In the gear transmission having the above-described characteristics, the shift rod is a hollow shaft formed with a hollow hole penetrating the entire length thereof, and supplies hydraulic oil to the other hydraulic actuator through the hollow hole. It is characterized by doing.

  According to the present invention, the shift operating device for switching the gear position is configured to be able to supply a pair of hydraulic actuators formed at both end shaft support portions of the shift rod and hydraulic oil from one shaft support portion to the hydraulic actuators. Therefore, it is not necessary to form an oil passage on the transmission case side with respect to the other-side shaft support portion, the oil passage formation is simplified, and cost reduction and increase in case weight are suppressed.

  In addition, since the hydraulic oil supply oil path to the other hydraulic actuator can be formed by using a shift rod as a hollow shaft, the formation of the hydraulic oil supply oil path on the transmission case side is simplified, Leakage countermeasures can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of the overall configuration of an automatic gear transmission according to an embodiment of the present invention. The transmission 10 is an automatic gear transmission (AMT) that can automatically change the gear position according to the running state of the vehicle. The input shaft 3 and the output shaft 4 include a plurality of transmission gear trains 1ST ( 1st speed) to 5TH (5th speed) are always provided in a meshing manner. This transmission gear train is provided with synchronization switching devices 7, 8, and 9 for switching gears. Shift operations of the synchronization switching devices 7, 8, and 9 are performed by shift operation devices 31, 32, and 33 having hydraulic actuators. Is provided. The shift operation device 31 corresponds to the first and second speeds, the shift operation device 32 corresponds to the third and fourth speeds, and the shift operation device 33 corresponds to the fifth speed.

  The control unit 20 sets a shift stage based on a vehicle running state signal, for example, an input signal such as a vehicle speed or a throttle opening, and outputs the shift signal to the hydraulic control valve 30.

  The hydraulic control valve 30 includes actuator solenoid valves 30a to 30c and actuator switching valves 30d to 30f. Upon receiving a shift signal from the control unit 20, the hydraulic pressure is supplied to the hydraulic actuators of the shift operating devices 31, 32, and 33. Automatic shift switching is performed by supplying and draining oil.

  FIG. 2 is an enlarged sectional view showing details of the shift operating device 32 of the present invention. The shift operation device 32 shifts the third-speed drive gear 13 or the fourth-speed drive gear 14 provided on the input shaft 3 so as to be rotatable between a gear position in a power transmission state and a neutral state. The device 8 includes a hub 8d fixed to the input shaft 3, a sleeve 8a that engages with the hub 8d and is slidable in the axial direction, and synchronization rings 8b and 8c. The fork 32b is engaged with.

  The fork 32b is provided integrally with a shift rod 32a that supports the fork 32b. The shift rod 32a is pivotally supported by two shaft support portions 50 and 60 provided at both ends of the transmission case, and the shaft support portion 50 is provided. , 60 are provided with hydraulic actuators 32L, 32R. The shift rod shaft support 50 on one side is formed in a stepped hole 5b having different inner diameters, the large diameter hole 5c is used as a cylinder of a hydraulic actuator, and a piston 32c formed on the outer periphery of the end of the shift rod 32a is inserted. Thus, a hydraulic chamber 32d is formed, and a hydraulic actuator 32L on one side that shift-drives the shift rod in the arrow R direction is configured. A shaft support member 32e such as a bush that rotatably supports the shift rod in the axial direction is attached to an intermediate portion 5d of the stepped hole 5b. The shaft support member 32e is connected to an end of the shift rod at an oil passage. The hydraulic oil supplied from 32h can be communicated with the hydraulic chamber 32d.

  Further, one end of an oil passage pipe 32f inserted into a hollow hole 32g provided through the shaft center of the shift rod 32a is press-fitted and fixed to the small end diameter hole 5e of the stepped hole 5b. The end is inserted into the hollow hole 32g of the shift rod 32a in an oil-tight and slidable manner. A hydraulic oil supply oil passage 32i is opened at the end of the small-diameter hole, and the supplied hydraulic oil passes through the oil passage pipe 32f and the hollow hole 32g of the shift rod, and the other shaft support portion 60 of the shift rod. Can be supplied.

  The shift rod shaft support portion 60 on the other side also has substantially the same configuration as the shaft support portion 50 on the one side described above, and a piston 32c formed on the outer periphery of the end portion of the shift rod is inserted into the large diameter hole 6c as a cylinder. A hydraulic chamber 32d is formed, and the other hydraulic actuator 32R that is driven to shift in the direction of arrow L is configured. The one-side hydraulic actuator 32L and the other-side hydraulic actuator 32R are arranged so as to operate in directions facing each other, forming a pair.

  The other two shift operation devices 31 and 33 have the same configuration as the shift operation device 32 described above, and the shift operation is 1st speed and 2nd speed in the shift operation device 31, and the shift operation device 33 is 5th speed. The description is omitted because only the target is different.

  The fork 32b attached to the shift rod 32a is provided with a detent mechanism 40 which is positioned at three positions of a shift position (3rd and 4th speed in the drawing) and a neutral position between the transmission case 5 and the fork 32b. Further, a stroke sensor 41 for detecting the shift stroke of the shift rod is provided.

  The shift operation devices 31, 32, 33 arranged in the transmission case include a supply oil path 32h to the hydraulic actuator 32L configured on one side and a supply oil path to the hydraulic actuator 32R configured on the other side. Both 32i are formed in the shaft support 50 on one side, and oil passages (not shown) from the hydraulic control valve 30 communicate with each other. Here, for example, when traveling at the third speed (the sleeve 8a in FIG. 2 is engaged with the third speed gear 13), the hydraulic pressure for shifting the gear is supplied from the hydraulic control valve 30 to the oil passage 32h. The hydraulic actuator 32L is actuated, and the shift rod 32a is shifted to the neutral position in the center, and then shift-driven to the fourth speed to switch the gear.

  FIG. 3 is a schematic view of an embodiment in which the shift operating device of the present invention is applied to a transaxle gear transmission. 1 is a clutch input shaft, 2 is a clutch, and 3 is an input shaft of a transmission. The input shaft 3 is integrally provided with first-speed and second-speed drive gears 11 and 12, and third-speed to fifth-speed drive gears 13 to 15 are rotatably provided. The output shaft 4 arranged in parallel with the input shaft 3 is provided with 1st to 5th driven gears 21 to 25 which mesh with the respective drive gears on the input shaft side, and the 1st and 2nd driven gears are output. The other 3rd to 5th driven gears are provided integrally with the output shaft 4 so as to be rotatable on the shaft 4.

  A synchronous switching device 7 is provided between the first and second driven gears 21 and 22, and a synchronous switching device 8 is provided between the third and fourth speed driving gears 13 and 14. The high-speed drive gear 15 is provided with a synchronous switching device 9 so that the respective shift stages can be switched.

  On the lower side of the figure, shift operating devices 31, 32, 33 including the hydraulic actuator are arranged in parallel with the output shaft, and one side thereof is integrally formed with a main case 5 that is a transmission case. As shown in FIG. 4, it is supported by a support wall 5a for bearing support of the input / output shaft, and the other side is supported by a rear case 6 (not shown) which is a transmission case. Then, hydraulic oil is supplied to the left one-side hydraulic actuators 31L to 33L shown in FIG. 4 through oil passages 31h to 33h, and the other hydraulic actuators 31R to 33R not shown in FIG. The hydraulic oil is supplied through the oil passages 31i to 33i.

  In this embodiment, the support portion on one side that pivotally supports the shift rod of the shift operation device shares the support wall 5a that supports the input / output shaft of the main case, so that the hydraulic actuator It also facilitates the formation of oil paths to the

  According to the embodiment of the present invention described above, the hydraulic oil can be supplied from only one shaft support portion to the pair of hydraulic actuators arranged at both ends of the shift operation device. When the shift operation device is arranged, the restriction on the oil passage formation to the other hydraulic actuator is eliminated, so that the degree of freedom of the arrangement layout is expanded. Further, the type of transmission to which the present invention is applied can be applied to all constantly meshing gear transmissions regardless of types such as a vertical type and a horizontal type.

1 is an overall schematic configuration of an automatic gear transmission according to the present invention. It is an expanded sectional view which shows the detail of the shift operation apparatus of FIG. It is a skeleton figure of the automatic gear transmission in an embodiment. It is a fragmentary sectional view which shows arrangement | positioning of the shift operation apparatus of FIG.

Explanation of symbols

3 Input shaft 4 Output shaft 5 Main case (transmission case)
6 Rear case (transmission case)
7-9 Synchronous switching device
11 to 15 Drive gears 21 to 25 Driven gears 31 to 33 Shift operation devices 31L to 33L One side hydraulic actuators 31R to 33R The other side hydraulic actuator 50 One side shaft support 60 The other side shaft support

Claims (2)

A gear transmission comprising: an input shaft including a plurality of drive gears; an output shaft including a driven gear that meshes with the drive gears to form a plurality of transmission gear trains; and a synchronous switching device that performs a shift operation on the transmission gear trains. A gear transmission provided with a shift operation device that is arranged to be reciprocally movable in the axial direction on the side of a transmission case that houses the transmission gear train, and that operates the synchronous switching device between a shift position and a neutral position. ,
The shift operation device is formed integrally with a pair of hydraulic actuators that shift-drive the shift rods in directions facing each other on both shaft support portions of a shift rod that is pivotally supported on both ends of the transmission case. An oil passage is communicated from the shaft support portion on the side to the hydraulic actuator on the other side via the shift rod, and hydraulic oil is supplied to the pair of hydraulic actuators via the one side shaft support portion of the shift rod. A gear transmission characterized by being configured as described above.   2. The shift rod according to claim 1, wherein the shift rod is a hollow shaft formed with a hollow hole that penetrates the entire length of the shift rod, and supplies hydraulic oil to the other hydraulic actuator through the hollow hole. Gear transmission.

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