JPS6248108B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speed change operation device for a multi-gear transmission, which is made compact as a whole by performing a five-speed gear change using an idle shaft for supporting an idle reverse gear.

Some multi-gear transmissions are capable of gear changes from first to fifth gear. In this case, the shift gears from 1st to 4th gear and the 5th gear are mounted far apart, so the shift shaft used to operate the 5th gear is considerably affected. It was a long one. Therefore, there was a problem in that the structure of the shift shaft portion of the speed change operating device became large.

An object of the present invention is to provide a speed change operation device for a multi-gear transmission that solves this problem.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a mission case. The transmission case 1 rotatably supports an input shaft 2, an output shaft 3, and a countershaft 4. 5 is an idle shaft parallel to the countershaft 4. The idle shaft 5 is supported by the transmission case 1 at a position close to the countershaft 4 so as to be movable in the axial direction.

6 is a first drive gear integrated with the input shaft 2; 7
is a second drive gear fixed to the countershaft 4. 8 is a first third gear, 9 is a first second gear, 10 is a first reverse gear that is a transmission gear, and 11 is a first low gear, which are fixed to the countershaft 4.

12 is a second third gear that meshes with the first third gear 8; 13 is a second second gear that meshes with the first second gear 9; 14 is the first low gear 1;
A second low gear meshes with the output shaft 1 and is rotatably supported by the output shaft 3. 15 is a clutch sleeve, 16 and 17 are synchronizer rings, and 18 is a clutch hub spline-fitted to the output shaft 3 between the second low gear 14 and the second second gear 13.

19 is a second reverse gear as a transmission gear. This second reverse gear 19 is mounted on the outer peripheral surface of the clutch hub 18 so as to move only in the axial direction of the output shaft 3. 20 and 21 are the second
These are synchronizer rings attached to the low gear 14 and the second second gear 13, respectively.
14a and 13a are pawl gears provided on the second low gear 14 and the second second gear 13.

22 is an idle reverse gear as a transmission gear. This idle reverse gear 22 is slidably supported by the idle shaft 5. In the figure, the idle shaft 5 is located below the countershaft 4, but this is shown unfolded for illustration purposes; in reality, the idle shaft 5 is located below the countershaft 4.
faces the gap between the countershaft 4 and the output shaft 3. And this idle shaft 5
By displacing the idle reverse gear 22 mounted on the idle shaft 5 in the axial direction of the idle shaft 5, the idle reverse gear 22 can mesh with the reverse gears 10 and 19 at the same time.

23 is a first five-speed transmission gear, and 24 is a second five-speed transmission gear, which mesh with each other. The first five-speed transmission gear 23 is rotatably supported by the countershaft 4, and the second five-speed transmission gear 24 is fixed to the output shaft 3. 25 is a pawl gear provided on the first five-speed transmission gear 23, and 26 is the first five-speed transmission gear 2.
3 is a synchronizer ring, 27 is a clutch hub fixed to the countershaft 4 adjacent to the first five-speed transmission gear 23, and 28 is a clutch sleeve. The clutch sleeve 28 is mounted on the outer peripheral surface of the clutch hub 27 so as to be movable only in the axial direction of the countershaft 4.

A circumferentially extending groove 28a is formed on the circumferential surface of the clutch sleeve 28. This groove 28a
is the tip fork part 29a of the shift fork 29.
is engaged. A base end portion of this shift fork 29 is fixed to one end portion of the idle shaft 5.

In FIGS. 2 to 4, 30 is a first shift shaft, 31 is a second shift shaft, and 3 is a first shift shaft.
2 is a third shift shaft, and 33 is an auxiliary shaft, which are supported by the upper case 1a of the mission case 1 so as to be movable in the axial direction. Note that in FIG. 2, the third shift shaft 33 is removed.

The shift shafts 30, 31, 32 have engagement grooves 30a, 31a, 32a that open upwardly and laterally.
is provided. In FIG. 3, this engagement groove 30
a, 31a, and 32a are arranged laterally (in a straight line).

A shaft 34 is disposed on the engagement grooves 30a, 31a, and 32a. This shaft 34
is oriented in a direction perpendicular to the shift shafts 30, 31, and 32. Moreover, shaft 34
is rotatably supported by the upper case 1a of the mission case 1. This shaft 34 is integrally provided with an arm 34a.
4a is adapted to be rotated by operating a change lever (not shown). A spline 35 is formed on the shaft 34, and a sleeve 36 is spline-fitted to the spline 35. This sleeve 36 is integrally provided with an arm 37 whose tip end engages with one of the engagement grooves 30a, 31a, and 32a, and a small protrusion 38 extending in the same direction as the arm 37. In FIG. 4, 39 is a spring that biases the sleeve 36 to the left.

40 is a shaft rotatably supported by the upper case 1a of the mission case 1. This shaft 40 faces in the vertical direction, and has a horizontally extending arm 41 fixed to its lower end. The tip 41a of this arm 41 is connected to the arm 37.
and the protrusion 38. Reference numeral 42 denotes an arm provided integrally with the shaft 40, and this arm 42 is adapted to be rotated by a change lever (not shown).

43 is a shift fork attached to the first shift shaft 30, and this shift fork 43
The distal end portion 43a is engaged with a groove 19a formed in the second reverse gear 19 and extending in the circumferential direction. 4
A shift fork 4 is attached to the second shift shaft 31, and a tip end 44a of the shift fork 44 is engaged with a groove 15a extending in the circumferential direction of the clutch sleeve 15.

An arm 45 having the above-described engagement groove is fixed to the third shift shaft 32. The tip of this arm 45 engages with a groove 46 formed in the idle shaft 5. Further, the third shift shaft 32 and the shaft 33 are connected to the connecting member 4.
They are integrally connected by 7. This connecting member 4
7 is integrally provided with an arm 48. The tip of this arm 48 has a long groove 4 that opens at the tip.
9 is formed.

This arm 48 and the above-mentioned idle reverse gear 10 are connected via a link mechanism 50. This link mechanism 50 includes a link 51 whose upper end is rotatably supported by a shaft 56 on the upper case 1a.
Pin-shaped protrusions 52 and 53 are formed at the middle and lower ends of the link 51, respectively. The protrusion 52 engages with the long groove 48a of the arm 48, and the protrusion 53 engages with the circumferentially extending groove 22a of the idle reverse gear 22.

In Fig. 2, 32a is a positioning groove for the reverse position, 32b is a positioning groove for the neutral position, and 32c is a positioning groove for the neutral position.
are positioning grooves for the fifth speed position, and these are formed in the third shift shaft 32. Upper case 1
These positioning grooves 32a, 32b, 32c are shown in a.
A positioning ball 54 to be engaged with is held. This ball 54 is biased toward the third shift shaft 32 by a spring 55.

Next, a description will be given of a gear change operation between fifth speed and reverse in the transmission configured as described above.

Arm 4 by operating the change lever (not shown)
2, the sleeve 36 is moved to the left in FIG. 4 via the arm 41, and the tip of the arm 37 is engaged with the engagement groove 32a.
In this state, when the third shift shaft 32 is moved from the position shown in FIG. 2 to the left in the figure by operating the above-mentioned change lever (not shown) and rotating the arm 34a, the idle shaft 5 moves to the left in the figure. 45 to the third shift shaft 3
At the same time, the clutch sleeve 28 is displaced to the left together with the idle shaft 5 via the shift fork 29.

Along with this, the clutch sleeve 28 is disengaged from the pawl gear 25 and synchronizer ring 26. As a result, the interlock between the countershaft 4 and the first five-speed change gear 23 is cut off. At the same time, the link 51 is
8, the shaft 5 in FIG. 2 through the long groove 49 and the projection 52.
6 in the clockwise direction, the idle reverse gear 22 is moved to the left on the idle shaft 5 in FIGS. 1 and 2, and the ball 54
When the idle reverse gear 22 engages with the positioning groove 32a, the idle reverse gear 22 meshes with the reverse gears 10 and 19 at the same time. As a result, the countershaft 4 and the output shaft 3 are interlocked, and the output shaft 3 is connected to the input shaft 2.
is reversed by the rotation of

Also, by performing the opposite operation, the ball 54
is engaged with the positioning groove 32c, the engagement between the reverse gears 10, 19 and the idle reverse gear 22 is released, and the clutch sleeve 28 is simultaneously engaged with the pawl gear 25 and the synchronizer ring 26, so that the countershaft 4 and output shaft 3
and are interlocked via fifth speed change gears 23 and 24.

Note that when the ball 54 is engaged with the positioning groove 32b, the meshing of the reverse gears 10 and 19 and the idle reverse gear 22 and the clutch sleeve 2
8, claw gear 25, synchronizer ring 26
Since the meshing with the transmission gear is disengaged, the transmission is located at a neutral position.

As explained above, the present invention allows a five-speed gear change to be performed via the idle shaft for supporting the idle reverse gear, so that the entire structure of the part incorporating the shift shaft is made much smaller than before. be able to.

[Brief explanation of the drawing]

FIG. 1 is an exploded sectional view of a transmission showing an embodiment of the present invention. FIG. 2 is a sectional view showing the relationship between some of the parts shown in FIG. 1 and the speed change operating device according to the present invention. FIG. 3 is a partial sectional view taken along line - in FIG. 2. FIG. 4 is a partially cutaway sectional view of the speed change operating device shown in FIG. 2. 1...Mission case, 4...Countershaft, 5...Idle shaft, 22...Idle reverse gear, 23, 24...Transmission gear (for 5th speed), 25...Pawl gear, clutch, 26...
Synchronizer ring, clutch, 27...clutch hub, clutch, 28...clutch sleeve, clutch, 29...shift fork, 32...
...Shift shaft, 50...Link mechanism.

Claims (1)

[Claims] 1. In a multi-gear transmission having five-speed and reverse gear change positions, an idle shaft supporting an idle reverse gear is supported by a transmission case so as to be movable in the axial direction, and is rotatably supported by a countershaft. A shift fork fixed to the idle shaft is engaged with a clutch sleeve of a clutch that connects and disconnects between the supported five-speed gear and the countershaft, and the idle shaft is linked to the shift shaft that is linked to the change lever. A speed change operation device for a multi-stage gear transmission, characterized in that: 2. In the speed change operation device for a multi-stage gear transmission according to claim 1, the idle reverse gear is slidably supported on the idle shaft, and either the idle reverse gear or the idle shaft is integrated with the shift shaft. and the other of the idle reverse gear and the idle shaft is linked to the shift shaft via a link mechanism.