JPS63266253A - Shift device for gear transmission - Google Patents

Abstract

PURPOSE:To decrease the size of a transmission, by a method wherein forks for a forward maximum step and a reverse step are mounted on a single fork shaft, and during shifting to the forward step, the single fork shaft itself is also stopped and held. CONSTITUTION:When a shift lever is shifted from a neutral position to a reverse step, a fork member 26 is moved in linkage with movement of the shift lever, and the engaging state of the gear of a transmission is selected to a reverse step by means of a fork part 28 for reverse. During shifting to a reverse step, a release mechanism 34 is actuated to release the fork member 26 and a fork shaft 23, i.e. a shift fork 24 for a forward fifth step, from locking to each other, and the fork 24 is not moved but held and stopped. As noted above, since the single moving fork shaft 23 may suffice for operation of a shift device and a stationary fork shaft is eliminated, the size in a radial direction of the transmission can be reduced by a size equivalent to the size of the stationary fork shaft. Since only the fork member 26 is moved, the overall length in an axial direction of the transmission can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a shift device for a gear type transmission, and in particular, the present invention relates to a shift device for a gear type transmission. The present invention relates to an improvement in a shift operating machine having a groove for shifting.

(Conventional technology).

Generally, it is desirable to make the overall length of the transmission in the axial direction as short as possible from the viewpoint of installation space in the vehicle body.

Incidentally, depending on the shift pattern of the transmission, the highest forward speed (for example, the fifth forward speed) and the reverse speed may be shifted on the same shift line. In a device having this type of shift operation mechanism, when shifting to reverse gear, the shift fork for the highest forward speed is not moved, thereby eliminating the space for movement of the shift fork. The requirement of shortening the overall length of the machine is achieved.

Conventionally, as a shift device manufactured by such @, JP-A-59-1
As disclosed in Japanese Patent No. 64442, two movable and fixed fork shafts are provided parallel to each other, and these two
By providing a mechanism between the main fork shafts that releases the lock between the fork for the highest forward speed and the movable fork shaft when shifting to reverse, the highest forward speed can be changed when shifting to reverse. It has been proposed that the shift fork for the vehicle is stopped and held.

(Problem to be solved by the invention) However, in this proposal, the fixed j3 and the movable j2
Since it has a regular fork shaft and the release Ia mechanism is arranged between both shafts, the space occupied by the fork shaft and the interval between both shafts are
There was a problem in that the size of the speed change compensation in the radial direction became large.

The present invention has been made in view of the above points, and its object is to provide the forks for the highest forward speed and reverse speed on one fork shaft.
The structure is designed such that when shifting to reverse gear, one fork shaft itself is stopped and held, thereby increasing the radial size of the transmission by reducing the number of shafts. This is due to the miniaturization of the hook and the shortening of the overall length in the axial direction.

(Means for Solving Problem 1) In order to achieve this object, the solution of the present invention fixes the shift fork for the highest forward speed integrally with the fork shaft, and Supports the shift fork for reverse gear, and the shift fork for the highest forward gear 1
- The fork and the fork shaft are locked so that they move together when changing gears to the highest forward speed, and are released from locking when changing gears to reverse gear.

Specifically, as described above, the present invention shifts the highest forward gear and the reverse gear by shifting on the same shift line.
- The premise is a gear transmission with a shift change mechanism that can be changed.

This speed change includes a movable fork shaft that is movably and integrally fixed to the shift fork of the highest forward speed, an input part a3 that is movably and integrally locked and supported on the movable fork shaft and connected to the shift lever. A fork member for the reverse stage is integrally formed and transmits the movement of the shift lever to the shift fork for the highest forward speed stage through a movable fork shaft.

Convexly, there is a release II that allows the locking of the fork member with the fork shaft to be released only when shifting to the reverse gear.
Set @.

(Function) With the above configuration, in the present invention, when the shift lever is shifted from the neutral position to the highest forward speed, the fork member is connected to the shift lever at its input portion, and the fork member is connected to the shift lever at its input portion. The fork member is locked to a fork shaft to which a shift fork for the highest forward speed is fixed, and by this locking, the movement of the shift lever is transmitted to the shift lever A for the highest forward speed, and the shift fork is moved. As a result, the meshing state of the gears of the transmission is selected to be the highest forward speed. Incidentally, since the fork portion for the reverse gear is integrally formed in the fork member, the fork portion for the reverse gear also moves simultaneously with the shift engine to the highest forward speed.

On the other hand, when the shift lever is shifted from the neutral position to the reverse gear, the fork member connected to the shift 1 lever moves, and the fork part for the reverse gear changes the meshing state of the gears of the transmission. Selected for reverse gear. However, when shifting from 1 to the reverse gear, the release mechanism operates to release the lock between the fork member and the fork shaft, that is, the shift fork of the highest speed. The shift fork remains stationary without moving.

In that case, the shift fork for the highest forward gear and the fork part of the fork member for the reverse gear are arranged on a single wooden fork shaft, and the fork member and the fork part for the highest forward gear are arranged on the same shaft when shifting to the reverse gear. Since it is possible to release the lock from the shift fork for high-speed gears, there is no need for a fixed fork shaft like in the past, and only one movable fork shaft is required, which reduces the radial size of the transmission. It will be possible.

Moreover, when changing gears to reverse gear, the release tj-
Fork members and movable fork shirts 1~ by JJM.
In other words, the locking with the shift fork for the highest forward speed that is movably fixed to the fork shirt 1~ is released, only the fork member moves, and the shift fork for the highest forward speed is moved from the movable fork shaft a3 to the fork shaft a3. The shift fork does not move. Therefore, the overall length of the transmission in the axial direction can be shortened by the amount of the valve that requires the movement space.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 3 shows the overall configuration of a gear transmission IJA according to an embodiment of the present invention, which is installed in the front part of the vehicle body of a front-wheel drive vehicle in a so-called horizontal position, and 1 is a case thereof. An input shaft 2 drivingly connected to the engine via a clutch mechanism (none of which is shown), an output shaft 3 disposed parallel to one side (downward in the diagram) of the input shaft 2, and an input shaft 2 A reverse counter shaft 4 is rotatably supported on the other side (on the upper side) and is arranged parallel to the upper side, and the output shaft 3 has a right end portion thereof which is used for differential viewing between the front wheels] 9 (not shown) The drive is connected to the

Above the input 11!1t12, in order from the right side (clutch mechanism side), there are drive gears 5 for the first forward transmission and the second speed.
, 6 are integrally formed. On the other hand, on the output shaft 3 are rotatable first and second driven gears 7.8 that are always engaged with the first and second forward speed drive gears 5.6 on the input shaft 2, respectively. A clutch hub 9 is rotatably connected to the output shaft 3 between the two wave drive gears 7.8, and on the clutch hub 9 are driven gears for the first speed and the second speed. A sleeve 10 that can be spline-coupled to the gear 7.8 is slidably and rotatably spline-coupled to the gear 7.8. By sliding this sleeve 10, the clutch hub 9 integrated with the output shaft 3 is connected to the first gear or By meshing with the second continuous driven gear 7.8, the gear stage is switched to the forward first gear or the second forward gear.

Further, on the input shaft 2 on the left side of the second speed drive gear 6, third forward speed drive gears 11 and 4th speed drive gears 11 and 12 are respectively rotatably supported.

In addition, a clutch hub 1 is provided between both drive gears 11 and 12.
A sleeve 14 is slidably and rotationally integrally connected to the clutch hub 13, and a sleeve 14 is slidably and rotatably connected to the third and fourth speed drive gears 11, 12 by splines. There is. On the other hand, on the output shaft 3 are the third speed j3 and fourth speed drive gears 11 on the input shaft 2.
．． Driven gears 15 and 16 for third and fourth gears, which are in constant mesh with 12, are rotatably coupled to each other,
By sliding the sleeve 14 on the input shaft 2 and engaging the clutch hub 13 integrated with the input shaft 2 with the 3rd or 4th gear drive gear 11.12, the gear is shifted to the 3rd forward gear.
It is designed to switch to a gear or a fourth gear.

Further, on the input shaft 2 on the left side of the fourth drive gear 12, a fifth drive gear 17 serving as the highest forward speed is rotatably supported, while on the output shaft 3, the fifth drive gear 17 is rotatably supported. Fifth continuous driven gear A71 that constantly meshes with speed drive gear A717
B is rotatably coupled. A clutch hub 19 is rotatably coupled to the input shaft 2 on the left side of the fifth gear 17, and a sleeve is provided on the clutch hub 19, which can be spline-coupled to the fifth gear 17. 2
0 is slidably and rotatably spline-coupled, and by sliding this sleeve 20 and meshing the clutch hub 19 integrated with the input shaft 2 with the 5th speed drive gear 17, the gear position is changed. The vehicle is switched to the fifth forward speed.

In addition, the drive gear 5.6 for the first forward speed and the second speed
A reverse drive gear 21 is about to be formed on the input shaft 2 between them. Further, a reverse counter gear 22 having a sleeve portion 22a is rotatably and slidably supported on the counter shaft 4, and by sliding to the left end position, the reverse counter gear 22 is moved to the first gear position. The teeth 10a formed on the outer periphery of the sleeve 10 for switching the second gear are provided so as to be able to mesh with the reverse drive gear 21 on the input shaft 2, and this meshing causes the gear to be shifted to reverse. It is designed to be switched.

The shift IaA has a shift operation Ia structure (not shown) for switching the gears to the above-mentioned forward first to fifth speeds and reverse gear, and this shift operation 1i1 structure allows As shown, the first and second forward speeds, the third and fourth speeds, and the fifth and reverse highest forward speeds are all the same. It is set so that a shift operation is performed on the shift 1 line to perform a shift change. For this reason, case 1 of the transmission tiffA includes a movable fork shaft (not shown) for switching between the first and second forward speeds, and a movable fork shaft for switching between the third and fourth forward speeds. (not shown) and a movable fork shaft 23 for switching between the fifth forward gear and the reverse gear as shown in FIG. (not shown).

As shown in FIG. 1, the movable fork shirts 1-23 for the fifth forward speed cB and the reverse are slidably supported in the axial direction by the case 1 of the speed change IXIA. ), a shift fork 24 for the fifth forward speed (highest speed), which is locked to the sleeve 20 for the fifth speed, is movably connected to the shift fork 24 by a pin 25; By moving the gear mA to the right, the gear stage of the shift mA is switched to the fifth gear stage.

Further, a cylindrical fork member 26 is externally fitted and supported on the right side of the fork shaft 23 so as to be movable in the axial direction and non-rotatably. An input section 27 connected via a connecting lever 29 is integrally formed 8. This input section 27
has an engaging groove 2.7a that engages the engaging end 29a of the connecting lever 29, and by selecting the shift lever, the engaging end 29a of the connecting lever 29 is moved into the engaging groove 27a. The fork member 26 is engaged with the shift lever, and the fork member 26 is moved in the left-right direction when the shift lever is shifted to the fifth forward gear or the reverse gear (shift operation). ing. Further, a reverse stage fork portion 28 that is engaged with the sleeve 22a of the counter gear 22 on the counter shaft 4 is integrally formed on the lower right end portion of the fork member 26. By moving the fork member 26 to the left, the gear stage is switched to reverse gear.

A groove 30 is formed at a predetermined position on the outer periphery side of the right end portion of the fork shaft 23 that is fitted onto the fork member 26 . The groove 30 includes a relatively deep engagement groove 30a and an inclined groove 30 on the left side of the engagement groove 30a.
3.b, and a pressing groove 30c that is shallower than the engagement groove 30a. In addition, the fork part jrA 26
A cylindrical portion 31 that protrudes radially outward is integrally formed on the side of the stone end, and within the cylindrical portion 31 there are a plurality of (three in the figure)
Ball 32, 32. ... is movable and the ball 32 at the inner end is in the groove 30 on the outer periphery of the fork shaft 23.
It is fitted and inserted in a manner that it can be fitted and locked. Further, a regulating pin 33 extending leftward in parallel with the fork shaft 23 is fastened and fixed to the case 1 supporting the right end of the fork shaft 23, and the regulating pin 33 is connected to the cylindrical portion of the fork member 26 Ball in 31 32. 32.・
A cylindrical regulating part 33a that presses and regulates the inner end of the ball 32 inwardly so that the ball 32 at the inner end thereof fits and locks into the engagement groove 30a of the groove 30 on the outer periphery of the fork shaft 23, and the regulating part 3.
The balls 32, 32 .・・・
・Release the pressure restriction on the inner end of the ball 32
is pressed into the pressing groove 30C of the concave groove 30. A cylindrical pressing portion 33G having a smaller diameter than the regulating portion 33a is provided. The regulating portion 33a of this regulating pin 33
The position of the pressing portion 33C is set at a predetermined position according to the moving position of the fork shaft 23, and the input portion 27 of the fork portion (126) is connected to the connecting lever 2 on the shift lever side.
When the fork member 26 is moved from the neutral position to the right by shifting 1 to change the shift lever to the fifth forward speed, the regulating portion 33a of the regulating pin 33 is engaged.
Due to this, the ball 32 in the t-recessed part (A26 cylindrical part 31
, 32. ... is suppressed and regulated by engaging the engagement groove 30a of the groove 30 on the outer periphery of the fork shaft 23 with the ball 32 inside the fork ( 126 is movably and integrally locked to the fork shaft 23, the movement of the shift lever is transmitted to the shift fork 24 for the fifth forward speed, and the transmission A
When the fork member 26 moves to the left from the neutral position by shifting the shift L-lever to the reverse gear while switching to the fifth forward gear, the regulation pin 33 is moved as shown in FIG. Ball 32.32 of part 33a
．． ... is released to release the lock between the fork member 26 and the fork shaft 23, and the ball 33 is pressed and fitted into the pressing groove 30G of the groove 30 by the pressing part 33C of the regulating pin 33. Then, by stopping and holding the fork shaft 23 at a predetermined position against the movement of the fork member 26 by the pressing force, the movement of the shift 1 lever is controlled by the fork portion 28 for reversing that is integrally formed with the fork member 26. J% releases the lock between the fork member 26 and the fork shaft 23 only when the lever is shifted from shift 1 to reverse gear so that the transmission A@reverse gear is switched. A structure 34 has been established for cancellation.

In addition, in FIG. 1, 35 is a cover that covers the left side surface of the case 1 of the transmission A.

Next, to explain the operation of the above embodiment, when the shift lever is shifted from the neutral state to the fifth gear, which is the highest forward speed, the connection lever The engaging end portion 29a of the fork member 29 engages with the input portion 27 of the fork member 26, and the fork member 26 moves to the right. During this movement of the fork member 26 to the right, the release mechanism 34 is kept in an inoperative state, and the balls 32, 32. ... is pressed and regulated by the regulating portion 33a of the regulating pin 33, and the ball 32 at the inner end
is the engagement groove portion 3 of the concave groove 30 in the fork shaft 23
0a, and due to this engagement, the fork shaft 23 is integrally locked with the fork part ] 26 and moves to the right, and as the fork shirts 1 to 23 move, the fork shaft 23 is coupled to the left end of the shaft 23. The fork 24 for the fifth forward speed moves to the right, thereby switching the variable MIA to the fifth forward speed. At this time, the reverse gear fork portion 28 integrally formed with the fork member 26 also moves to the right.

On the other hand, when the shift lever is shifted from the neutral position to the reverse gear, which is opposite to the fifth forward gear, the engaging end of the connecting lever 29 is moved as the shift lever is operated. 29a is the input part 27 of the fork member 26
After engaging, fork member 26 now moves to the left. As the fork member 26 moves to the left, the release mechanism 34 becomes activated, and the balls 32, 32. ... is released from the pressure restriction by the regulating portion 33a of the regulating pin 33, and the ball 32 at its inner end engages with the concave groove 30 of the fork shaft 23. 30G, and the engagement groove 3 of this ball 32
By releasing the engagement with 0a, the integral locking between the fork shaft 23 and the fork member 26 is released, the fork shaft 23 stops, and only the fork member 26 moves to the left. , the reverse gear fork portion 28 coupled to the right end of the gear moves to the right, thereby switching the transmission A to the reverse gear.

At this time, the inner ball 32 is press-fitted into the press groove 30c of the concave groove 30 while being pressed and held by the press part 33G of the regulating pin 33. For this reason, the fork shaft 23 is connected to the regulating pin 33 via the balls 32, 32°...
The shift fork for the fifth forward speed moves with the movement of the fork shaft 23 at the time of shift 1 change of the reverse gear. can be reliably prevented.

Therefore, in this embodiment, the fifth forward gear is mounted on one movable fork shaft 23 for the fifth forward gear and for the reverse gear.
A gear shift fork 24 and a reverse gear fork portion 28 of a fork member 26 are supported, and the foot member 26 and the fifth forward gear are connected on the fork shaft 23 during a shift change to reverse gear. Since the locking with the shift fork 24 for the shift fork 24 is released, a fixed fork shaft is not required, and only one of the movable fork shirts 1 to 23 is required, which reduces the large radial jaggedness of the shift USA. be able to.

Also, when changing gears to reverse gear, the release mechanism 34
As a result of the operation, the locking of the fork member 26 with the movable fork shaft 23 is released, and only the fork member 26 moves, and the shift fork 24 for the highest forward speed gear, which is integrally connected to the movable fork shaft 23 and the lever, is released. does not move. Therefore, the total length of the transmission A in the axial direction can be shortened by the amount of space for moving the fork shaft 23 and the like to the left.

(Effects of the Invention) As explained above, according to the present invention, in a gear transmission having a shift operation mechanism that shifts between the highest forward speed gear and the reverse gear by a shift operation on the same shift line, A shift fork for the highest forward speed is fixed integrally with a movable fork shaft, and a fork member having a fork portion for a reverse gear is supported on the fork shaft, and the fork member and fork shaft are connected by a release mechanism. By locking it when changing to the highest forward gear and releasing it when changing to reverse, the fixed fork shaft of the conventional one is no longer required, and the radial size of the transmission can be reduced. In addition, the movable fork shaft and the shift lever for the highest forward speed can be stopped and held during a shift change to reverse gear, and the overall axial length of the transmission can be reduced by the space for movement. can be shortened.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional view showing the configuration of the main parts, FIG. 2 is a partial cross-sectional view showing the release Ia mechanism in the unlocked state, and FIG. 3 is a longitudinal cross-section of the transmission. 4 are explanatory diagrams showing shift patterns of the transmission. A...Transmission, 23...Movable fork shaft, 2
4... 5th speed shift fork, 26... Fork member, 27... Input part, 28... Reverse fork part, 30... Concave groove, 32... Ball, 33...・Regulation bottle, 34... Release building.

Claims (1)

[Claims] (1) In a gear transmission having a shift operation mechanism that shifts between the highest forward speed and reverse gear by a shift operation on the same shift line, the gear transmission is movably fixed to the shift fork of the highest forward speed. A movable fork shaft, an input part and a reverse gear fork part which are movably locked and supported on the movable fork shaft and connected to the shift lever are integrally formed, and the movement of the shift lever is controlled by the movable fork shaft. and a fork member that transmits the transmission to the shift fork of the highest forward speed gear through the fork, and a release mechanism that releases the locking of the fork member with the fork shaft only when shifting to the reverse gear. Characteristic gear transmission shift device.