JPS6141045A - Speed change operation mechanism for speed change gear - Google Patents

Abstract

PURPOSE:To permit the speed change operation free from selecting operation by arranging an actuator for carrying-out shift operation for each shift fork and carrying-out speed change operation by selectively driving the actuator. CONSTITUTION:When, for example the third speed is selected in a speed change gear, pressurized oil is supplied only into the hydraulic chamber 72 of a cylinder appratus 58. Then, a piston 74 lowers, and an inner lever 22 is swung counterclockwise through a rod 96. A fork shaft head 16 is shifted rightward by the swing of the finger part 28 of the inner lever 22, and a motive power is transmitted to the speed change gear for the third speed. While, in a cylinder apparatus 60 connected to the inner lever 22, the piston 74 rises through the rod 96, and a compression coil spring 78 is put into strong compression state. When, for example speed change from the third speed to the fourth speed is performed, the hydraulic chamber 72 of the cylinder apparatus 58 is put into the opened state to the atmosphere, and at the same time, pressurized oil is introduced into the hydraulic chamber 72 of the cylinder apparatus 60.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a gear shift operation for a gear transmission that can be installed in a gear transmission where the shift operation was conventionally performed manually to automate the shift operation. Regarding the mechanism.

[Conventional technology]

Conventionally, gear transmissions have been widely adopted as manual transmissions in automobiles and the like. In recent years, attempts have been made to automatically control the speed change operation using the speed change mechanism of this gear transmission as is.

This kind of technology is based on Japanese Patent Application Laid-open No. 58-1709.
There are means proposed in No. 54 and Japanese Patent Application No. 58-182478. In these technologies, one or two pairs of hydraulic actuators are arranged in a gear transmission.

The gear shift operation is performed by controlling the drive of the fluid pressure actuator. The gear shifting operations of these technologies combine operations in the select direction and shift direction, as in the case of manual transmission.

[Problem that the invention seeks to solve]

With the above technical means, the gear shifting operation is performed in the select direction and
Since the operation is a combination of the operation in the shift direction and the shift direction, the operation time of the fluid pressure actuator is the operation time in the shift direction plus the operation time in the select direction. This total time is the time required for the gear shifting operation.

However, the operation in the select direction does not involve movement of the shift fork that selects the transmission gear, but simply switches the link mechanism.

Therefore, in the case of a shift operation that involves operation in the select direction, there is a problem in that the time required for the shift operation is longer than in the case of a shift operation that only involves operation in the shift direction.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a speed change operation mechanism for a gear transmission that can perform a speed change operation only by operating in the shift direction.

[Failure to solve the problem]

In the speed change operation mechanism for a gear transmission according to the present invention.

An actuator for performing a shift operation is disposed for each shift fork, and the actuator is selectively driven to perform a speed change operation.

[Effect]

In the present invention configured as described above, each shift fork is shifted by an actuator disposed for each shift fork, so that the actuator is selectively driven to perform a select operation. The gear shifting operation can be performed without any trouble.

[Embodiment] FIGS. 1 to 3 show an embodiment of a gear shift operation mechanism for a gear transmission according to the present invention, which is applied to an automobile transmission.

The shaft 10 is fixedly disposed above the transmission case 12 in a direction perpendicular to a main shaft (not shown) of the transmission. A stepped portion tOX is formed on the shaft 10. The upper part of the mission case 12 in which the shirt (shirt) 10 is fixedly arranged is open.

A cylinder ZEX 14 is fixedly arranged above this opening. Below the shaft 10, three fork shaft heads 16, 18 and 20 formed at the rear ends of three fork shafts (not shown) are arranged in parallel in the axial direction of the shaft 10. Fork shaft heads 16.18 and 20 have rectangular recesses 16A, 18.
& and 20A are formed.

A fork shaft (not shown) on which a fork shaft head 16 is formed is slidably supported by the transmission case 12. The fork (not shown) fixedly placed on the tip side of the fork shaft is moved to the right in Figure 2, and power is transmitted to the third speed gear (not shown), and the power is transmitted to the left in Figure 2. By being moved towards the 4th speed gear (
(not shown), so that the vehicle is in a neutral state at an intermediate position between the five vehicle movement positions.

A fork shaft (not shown) on which the fork shaft head 18 is formed and a fork shaft (not shown) on which the fork shaft head 20 is formed are also slidably supported by the transmission case 12 in the same manner as described above. A fork (not shown) is also fixedly arranged on the tip side of these fork shafts, and is moved in the same two directions as described above to be used as a gear change gear for either 1st gear, 2nd gear, 5th gear, or reverse gear. Or the power is transmitted to the reverse gear. Further, it is designed to be in a neutral state at an intermediate position between the moving positions in two directions. FIG. 3 shows the relationship between the moving positions of these forks and the gears through which power is transmitted.

The inner lever 22 is formed with a bearing portion 24, arm portions 26 extending to both sides of the bearing portion, and finger portions 28 extending downward from the bearing portion. The inner levers 30 and 32 have bearing portions 34 and 36, respectively, similar to those described above.
Arm portions 38 and 40 and finger portions 42 and 44 are formed that extend downwardly from the bearing portion. In the arm portion 26 of the inner lever 22, curved recesses 26A and 26B are formed on the upper surfaces of both sides of the bearing portion 24, and in the arm portion 38 of the inner lever 30, recesses 38A and 38B of the same shape as described above are formed. In the end portion 40 of the inner lever 32, recesses 40& and 40B having the same shape as described above are formed. Note that the recesses 38A and 40
A is not shown in the figure.

Innarenose is Innareno 32, Innareno 22
, and inner levers 30 are disposed on the shaft 10 in this order, and each bearing portion 36, 24, and 34 is fitted to the shaft 10 so as to be able to swing freely. Innareno 32 is shaft 1
0 and is prevented from moving to the right in FIG. 1. A distance piece 46 is disposed between the inner lenses 32° and the inner lenses 22 to maintain a constant distance between them. A distance piece 48 is also provided between the inner lever 22 and the inner levers 30 to maintain a constant distance between them. The inner levers 30 are pressed rightward in FIG. 1 by a pressing member 52 urged by a compression coil spring 50.

Therefore, each inner lever 22, 30 and 32 is prevented from moving in the axial direction of the shaft 10.

Note that the side of the compression coil spring 50 opposite to the pressing member 52 presses against a flanged cylindrical body 56 whose movement is prevented by a retaining ring 4 secured to the shaft 10 . Each finger portion 28.42 and 44 of the inner wheels 22.30 and 32 is connected to the fork shaft head 16.18 and 20.
each recess 16k.

18 and 20A, respectively.

The cylinder device 5814 includes six cylinder devices 58,
60, 62, 64, 66 and 68 are configured.

Note that the cylinder devices 64 and 68 are not shown in the figure. Each cylinder device has a hydraulic chamber 72 whose upper side wall communicates with an oil flow port 94 and whose bottom wall communicates with a small-diameter through hole 70.
A piston 74, a spring guide member 76, a compression coil spring 78, a tail cover 80, and a tail camp 82 are housed. Piston 741d O-'
! j-song 4, which is slidably fitted into the hydraulic chamber 72. Also, a spherical recess 74 is formed on the top surface of the piston 740.
A is formed. Tail cover 80 is 0-ring 8
6 and is fitted into the hydraulic chamber 72. The tail cap 82 is screwed into the upper part of the hydraulic chamber 72.

A lower cylindrical body 88 and an upper cylindrical body 90 are attached to the spring guide member 76.
and a tielon 1″ connecting the lower cylindrical body and the upper cylindrical body.
92. "F section cylindrical body 88 and Tyrone) '92 are freely movable. Spring guide member 76
The compression coil spring 78 is supported between the lower cylindrical body 88 and the upper cylindrical body 90 to form an integral assembly, and the upper part of this assembly is fitted inside the tail cover 80, A hinge is fitted inside the piston 74.

Six cylinder devices 58 to 68 and inner cylinders 22.
30 and the workpiece 32 are connected to each other via six rods 96 each having hemispherical ends.

That is, as shown in FIG.
Both ends are arranged, and the recess 74A of the piston 74 of the cylinder device 60 and the recess 26 of the arm part 26 of the inner lever 22
Both ends of the long p96 are arranged at B and B. Other cylinder devices and other inner levers are similarly connected.

Therefore, the inner lever 22 is connected to the cylinder devices 58 and 60 via the rod 96', the inner lever 30 is connected to the cylinder device 62 and the machining 64 via the rod 96, and the inner levers 32 are connected to the cylinder devices 58 and 60 via the rod 96. The device 66 is connected to the machine 68. In this state, both ends of the arms of each inner lens are connected m2f[! ] is equally biased by the compression coil spring 78 of the cylinder device, and the arm portion is maintained in a horizontal state.

In the speed change operation mechanism for a gear transmission according to the present embodiment, which is configured in one or more ways, the oil flow port 94 of each cylinder device is connected to a hydraulic power source (not shown). The hydraulic pressure source is configured to introduce pressure oil into any one of the six cylinder devices in response to a shift lever (not shown) or an electric signal from a control device.

Next, the entire operation of this embodiment will be explained. In the state shown in FIGS. 1 and 2, no pressure oil is introduced into any of the cylinder devices, and the hydraulic chamber 72 of each cylinder device is open to the atmosphere. For example, when the third speed of the transmission is selected, pressure oil is introduced only into the hydraulic chamber 72 of the cylinder device 58. Pressure oil is introduced into the cylinder device 58 and the piston 74
is lowered, and the inner lever 22 swings counterclockwise in FIG. 2 as it is pressed by the rod 96.
The 2 inger portion 28 of the 9 inner lever swings to the right. Due to the swinging of the swinger section 28, the first rifling shaft shaft 16 moves to the right in FIG.
Power is transmitted to. .

On the other hand, the cylinder device 6 connected to the inner lever 22
0, the piston 74 is pressed and raised via the long P96ft, and the compression coil spring 78 is in a strongly compressed state.

When shifting from 3rd speed to 4th speed, the cylinder device 5
At the same time that the hydraulic chamber 72 of No. 8 is opened to the atmosphere, pressure oil is introduced into the hydraulic chamber 72 of the cylinder device 60. Pressure oil is introduced into the cylinder device 60, the piston 74 descends, and the rod 96Vc is pressed, causing the inner lever 22 to swing clockwise in FIG.

When the inner lever 22 swings, the inner lever finger portion 2
8 moves to the left. Due to the swinging of the finger portion 28, the fork shaft hend 16 moves to the left after passing through the position shown in FIG. Power is transmitted to a transmission gear (not shown).

On the other hand, the cylinder device 5 connected to the inner lever 22
8, the piston 74 is pressed and raised via the long I-'96, and the compression coil spring 78 enters the high tension line state.

When shifting from 4th speed to 5th speed, the cylinder device 6
0 is opened to the atmosphere, and at the same time, pressure oil is introduced into the hydraulic chamber 72 of the cylinder device 66.

When the cylinder device 60 is opened to the atmosphere, the piston 74 of the cylinder device 58 is lowered by the strain energy of the compression coil spring 78, and the long arm 96 is fully pressed and the inner lever 22'a4f42 counterclockwise. direction, and the arm portion 26 of the Innareno-22 is swung horizontally. Due to the rocking of the inner levers 22, the fork shaft end 16 reaches the position shown in FIG. 2, and the fork becomes in a neutral state.

Simultaneously with this operation, pressure oil is introduced into the cylinder device 66, the piston 74 descends, and the inner lever 32 is swung toward the back side of the paper in FIG. 1 by being pressed by the long plate 96. Due to the swinging of the inner lever 32, the fork shaft 1'20 moves toward the back side of the paper in FIG. Gear (not shown) K power is transmitted.

As shown in the above-mentioned gear shifting operation from 3rd gear to 4th gear to 5th gear, the gear shifting operation is performed using the same fork, and the shifting operation is performed using another fork. In this case, these operations can be performed only by a shift operation without performing a so-called select operation.

It should be noted that both in the case of a deceleration operation and in the case of a shift operation in which an intermediate gear is skipped, these operations can be performed only by a shift operation in the same way as described above.

In this way, in this embodiment, hydraulic cylinders are used as actuators, two hydraulic cylinders are provided for each shift fork, and the hydraulic cylinders of the IWA are selectively driven, thereby eliminating the need for a select operation. It is designed so that the gear change operation is performed only by the shift operation. In addition, each hydraulic cylinder [is equipped with a compression coil spring, so
When none of the two hydraulic cylinders arranged for each shift are driven, the corresponding fork is placed in the neutral state without any other operation by opening the hydraulic cylinder to the atmosphere. be able to.

Therefore, any kind of speed change operation is completed in a short time, so the time during which driving force is not transmitted is shortened, and the idle running time and feeling of weakness during the speed change operation are reduced. Furthermore, since the rotational speed of the prime mover is less likely to drop, shocks during gear shifting operations are also reduced. In addition, no matter what kind of speed change operation is performed, the speed change operation is completed in approximately the same amount of time, so there is no discomfort. This is especially noticeable during deceleration operations, where downshifts are always quick and there is little shift shock.

〔Effect of the invention〕

As explained above, in the gear shift operation mechanism for a gear transmission according to the present invention, an actuator for performing a shift operation is provided for each shift fork, and the actuator is selectively driven to perform a speed operation. Therefore, the gear shifting operation can be performed without any selection operation.

[Brief explanation of the drawing]

FIG. 1 shows a gear shift operating device for a gear transmission according to the present invention. A front cross-sectional view showing an example of the structure taken along the line I-1 in Figure 2, a side cross-sectional view showing a view taken along the ■-n line in Figure 1, and Figure 3 showing the movement of the fork. FIG. 4 is a shift pattern diagram showing the relationship between position and gears to which power is transmitted. 10...Shaft, 12...Mission case, 1
4... Cylinder ponks, 16, 18. 20... Fork shaft spatula r, 22. ao, a2...inner lever, 58.60.62.64.66, fi8...
Cylinder device, 72... Hydraulic chamber, 74... Piston, 78... Compression coil spring, 96... Ron P.

Claims (1)

[Claims] (1) A shift operation mechanism for a gear transmission, characterized in that an actuator for performing a shift operation is disposed for each shift fork, and the actuator is selectively driven to perform a shift operation.