JPH027337Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shift device for a gear transmission.

[Prior Art] Vehicles for high-speed long-distance transportation that use expressways are required to have conventional multi-speed transmissions, such as transmissions with higher speeds than six-speed transmissions, in order to save fuel. Even if a vehicle is equipped with a high-speed gear for short-distance transportation using roads, it is rarely used, so developing a new multi-speed transmission will increase costs and have a large impact on vehicle prices. do.

Therefore, it is economical to connect an auxiliary gear box to the end of a conventional 6-speed transmission and attach a 7-speed gear mechanism to this auxiliary gear box.

[Problems to be solved by the invention] However, the shift shaft that operates the clutch that engages the 7th gear is extended to the same position as the shift shaft that operates the clutch that engages the other gears. , mounting the shift blocks parallel to each other on these shift shafts is difficult due to the presence of a partition wall in the gear box and the lack of sufficient space inside the conventional 6-speed transmission, as shown in Figure 1. This was extremely difficult due to the difficulty of obtaining a regular shift pattern, and if such a configuration was forced, the external size of the transmission would become large, which could pose a problem in mounting it on a vehicle.

For example, as shown in Japanese Utility Model Application Publication No. 56-339, the shift shaft part operated by the gear shift lever and the shift shaft part connected to the clutch are provided separately, and the space of the gear box is effectively used for both shift shaft parts. Although a mechanism has been proposed in which the gears are interlocked and connected, this has a complicated structure, and there is a fear that it takes time and effort to attach the gear box to the gear box and adjust the assembly position.

Furthermore, in the shift device disclosed in Japanese Patent Publication No. 58-28605, the restricting plate provided on the select lever shaft rotates in the select direction, so the shift operation space within the transmission must be increased in the select direction. In addition, there was a risk that a major change to the conventional transmission would be required.

In addition, in the above-mentioned shift device, since the reverse gear shift shaft and the highest gear shift shaft are integrated, they must be pressed at the same time at all times, and the pressing and sliding portion and its sliding resistance become large, and the gear shift lever is not operated. There was a risk that the process would not be carried out quickly and smoothly.

The object of the present invention is to provide a gear transmission shift device with a reverse gear shift shaft and a highest gear shift shaft that are slidably fitted into a cylindrical portion of a fixed wall, so that the shift shaft comes into contact with both end walls of the fixed wall when not in operation. First and second contact pieces are provided, and a push piece is provided that slidably engages the cylindrical portion and presses the first and second contact pieces when the gear shift lever is operated, and a push piece is provided on both the shift shafts. First and second pull-back pins are slidably fitted in the provided pin holes in the radial direction, and recesses are provided in the fixed wall in which the first and second pull-back pins engage when inactive, and when the pressing operation is activated, recesses are provided in the fixed wall. By providing the push piece with a recess that engages with the first and second pull-back pins, only the first contact piece and the reverse gear shift shaft operate when the gear shift lever is operated to shift to reverse gear, and the shift lever is activated. When the lever is operated to the highest gear, only the second contact piece and the highest gear shift shaft are operated, and the pressing operation parts and their sliding resistance by the push piece are reduced, and the gear change operation by the gear shift lever is easy. And it can be done smoothly,
The highest speed gear shift shaft is only slidably fitted into the cylindrical portion of the fixed wall into which the reverse gear shift shaft is slidably fitted, making it possible to increase the number of shift shafts in the select direction. In addition, the shift operation means of a conventional transmission can be used with a minimum of changes, and it can also be adopted in a conventional transmission, and the reverse gear shift shaft and the recess provided in the push piece and the fixed wall are connected to each other. A shift operation is performed by engaging and disengaging the first and second pull-back pins that are slidably fitted in the pin hole of the highest speed shift shaft in the radial direction,
To provide a shift device for a gear transmission in which mounting portions of the reverse gear shaft and the highest gear shift shaft are concentrated on the fixed wall, and assembly such as positioning of the pin holes is facilitated, and shift operation is highly reliable. It's about doing.

[Means for Solving the Problems] In order to achieve the above object, the gear transmission shift device of the present invention has a reverse gear shift shaft and a highest gear shift shaft that are slidably fitted in a cylindrical portion of a fixed wall. The shaft is provided with first and second abutting pieces that abut against both end walls of the fixed wall when not in operation, and are slidably engaged with the cylindrical portion, and the first and second abutting pieces are brought into contact with the first and second abutting pieces by operating the speed change lever. A push piece is provided to press the piece, and first and second pull-back pins are fitted into pin holes provided in both of the shift shafts so as to be slidable in the radial direction. providing a recess in the fixed wall that engages with the
The pushing piece is provided with a recess into which the first and second pull-back pins are engaged during the pushing operation.

[Function] The function of the gear transmission shift device of the present invention having the above configuration is as follows.

First, to obtain a reverse gear shift, when the gear shift lever is operated from the neutral position to the reverse gear side,
The pushing piece contacts the first pushed and first abutting piece via the arm of the third shift shaft, and the reverse gear shift shaft, which is integrated with the first abutting piece, is pushed leftward. It can be done. At this time, the first pull-back pin comes out of the recess of the fixed wall and engages with the recess of the pusher piece. In this way, when the reverse gear shift shaft is pushed to the left, the reverse gear gear is rotationally coupled to the main shaft by the clutch, and meshing of the gear gear to the reverse gear gear is achieved.

At this time, the second abutting piece of the highest speed shift shaft abuts against the right end wall of the fixed wall and does not operate.

Here, when the gear shift lever is shifted again to the neutral position, the push piece is returned to the right via the arm of the third shift shaft, and the first pull-back pin that engages with the recess of the push piece is The reverse gear shift shaft is pulled to the right through the reverse shift shaft, and stops when the first abutting piece abuts the left end wall of the fixed wall.

In this way, contrary to the case described above, the rotational connection between the reverse gear and the main shaft by the clutch is released.

Next, in order to obtain the highest speed, when the shift lever is operated from the neutral position to the highest speed, the push piece is pushed to the right via the arm of the third shift shaft, and the second The highest speed gear shift shaft, which is in contact with the abutting piece and is integral with the second abutting piece, is pushed to the right.

At this time, the second pull-back pin comes out of the recess of the fixed wall and engages with the recess of the pusher piece.
Thus, when the highest gear shift shaft is pushed to the right, the clutch rotationally connects the highest gear gear to the countershaft, and meshing of the gears to the highest gear is achieved.

At this time, the first contact piece of the reverse gear shift shaft contacts the left end wall of the fixed wall and does not operate.

Here, when the gear shift lever is shifted again to the neutral position, the push piece is returned to the left via the arm of the third shift shaft, and the second pull-back pin that engages with the recess of the push piece is pushed back. The highest speed gear shift shaft is pulled to the left through the shift shaft, and stops when the second abutment piece abuts against the right end wall of the fixed wall.

[Embodiment of the Invention] The present invention will be described based on an embodiment in which a seven-speed transmission having a shift pattern as shown in FIG. 1 is obtained from a six-speed transmission.

As shown in FIG. 2, the six-speed transmission has an input shaft 29 rotatably coupled to the engine crankshaft 27 via a clutch 28, which is rotatably supported by the end wall 8a of the gear box 8. A gear 6 is fixedly supported.

An output shaft or main shaft 30 is rotatably supported in the hollow inner end of the input shaft 29 and the end wall 8b of the gear box 8 in line with the input shaft 29. Gears 6, 5, 4, 3, which can freely rotate on the main shaft 30 but cannot move,
2, 1, R are supported, and for rotationally coupling them to the main shaft 30, known clutches 21, 22, 2 are supported.
3 and 24 rotate together with the main shaft 30 and are supported so as to be movable in the axial direction.

Gears 10, 11, 12, 1 are mounted on a countershaft 39 rotatably supported between end walls 8a and 8b of gear box 8.
3, 14, 15, and 16 are fixedly supported. gear 1
6 is always meshed with the gear 6 of the input shaft 29, the gear 15 is in mesh with the gear 5, the gear 14 is in mesh with the gear 4, and the gear 13 is in mesh with the gear 6.
are always meshed with gear 3, gear 12 with gear 2, and gear 11 with gear 1, respectively. The gear 10 is connected to the reverse gear R via an idle gear (not shown).
is engaged with.

A bifurcated shift arm 21a that straddles the main shaft 30 is engaged with the clutch 21. Shift arm 21a
is fixedly supported on a shift shaft 31 parallel to the main shaft 30. Similarly, the shift arms 22a, 23a, 24a engaged with each clutch 22, 23, 24 are
They are fixedly supported by shift shafts 32, 33, and 34, respectively. Each of the shift shafts 31, 32, 33, and 34 is supported so as to be movable in the axial direction by a code land box that constitutes the upper wall of the gear box 8, but for convenience of explanation, they are not shown on the side of the gear box 8 in the figure. It is shown.

In order to reduce the bending load on the main shaft 30, the reverse gear R is supported close to the end wall 8b, and the clutch 24 is disposed on the opposite side of the end wall 8b.

Each shift shaft 31, 32, 33, 36 is provided with a shift block 38 having a groove in which the end of the gear shift lever 9 engages. The shift lever 9 is engaged with the shift block of the shift shaft 33, and the gear lever 9 is further tilted in the front and rear direction, so that the shift shaft 33
When the clutch 23 moves to the right in FIG. 2, the clutch 23 moves to the right via the shift arm 23a.
Rotation coupling between the first gear gear 1 and the main shaft 30 is achieved, and the rotation of the input shaft 29 is transferred to the gears 6, 16 and the counter shaft 3.
9, and is transmitted to the main shaft 30 via gears 11 and 1.

A sub-gear box 18 is coupled to the end wall 8b of the gear box 8 to form a seven-speed transmission. The main shaft 30 and the counter shaft 39 are extended, and the gear 7 is fixedly supported on the main shaft 30 inside the sub gear box 18. Further, the highest speed gear, that is, 7, which meshes with the gear 7 on the subshaft 39.
A speed gear 17 is freely rotatably supported and can be rotatably coupled to a countershaft 39 by a clutch 25.
A shift arm 25a that engages with the clutch 25 is fixedly supported on a highest speed shift shaft 35.

In the shift device of the present invention, the reverse gear shift shaft 34 connected to the clutch 24 and the highest gear gear shift shaft 35 connected to the clutch 25 are arranged in a straight line, and are slidably supported on the wall of the gear box 8 described above. be done. The operation of the third shift shaft 36 equipped with the shift block 38 is transferred to the reverse gear shift shaft 34 via the arm 52.
Alternatively, it is configured to be transmitted to the highest speed shift shaft 35.

In more detail based on FIG. 3, the gear box 8
A cylindrical portion 43 is formed on a fixed wall 41 that is integral with the wall portion of the cylindrical portion 41, and a reverse gear shift shaft 34 and a highest speed gear shift shaft 35 are slidably fitted into the cylindrical portion 43. fixed wall 4
As shown in FIG. 4, a groove 50 having a trapezoidal cross section and extending parallel to the axis of the cylindrical portion 43 is provided in the upper part of the cylindrical portion 43, as shown in FIG. A push piece 48 is slidably supported in a groove 50 between a pair of first and second contact pieces 46 and 46A, which will be described later. Engagement recess 49 provided in pusher piece 48
2, the end of arm 52 shown in FIG. 2 is engaged.

At the end of the highest speed gear shift shaft 35, in the neutral position, the right end wall 41a of the fixed wall 41 and the pusher piece 48 are attached.
The second contact piece 4 that comes into contact with the right end 48a of
6 is fitted onto the outside and fixed with bolts 47. Furthermore, the fixed wall 41 has an upper part shorter in axial length than a bottom part, and the first and second contact pieces 4
6 is projected below the pusher piece 48. A radial pin hole 55A provided at the end of the highest speed shift shaft 35
Of the first and second pullback pins 44, 44A, the second pullback pin 44A is inserted and supported.
Both ends of the pull-back pin 44A are hemispherical, and the recess 42A and the pusher piece 48 are provided at the bottom of the fixed wall 41.
It is selectively engaged with a recess 51A provided at the bottom of the holder.

A first abutting piece 46 is fitted onto the reverse gear shift shaft 34 and fixed with a bolt 47 . A first pull-back pin 44 inserted and supported through a pin hole 55 provided at the end of the reverse gear shift shaft 34 is selectively engaged with the recess 42 of the fixed wall 41 and the recess 51 of the pusher piece 48 .

Further, 61 and 62 indicate pin holes formed in the first and second contact pieces.

As shown in FIG. 5, the second pull-back pin 44A
In order to prevent the pin from slipping out of the highest speed shift shaft 35, a retaining pin 56 is inserted from a hole provided in the second contact piece 46A to a pin hole 57 provided in the highest speed shift shaft 35 to prevent it from being pulled out. The inner end of the stop pin 56 is engaged with the groove 44a of the second pullback pin 44A.

The mechanism for preventing the second pull-back pin 44A shown in FIG.

Next, the operation of the gear transmission shift device of the present invention will be explained.

First, to obtain a reverse gear shift, move the shift lever 9 downward from the neutral position shown in FIG. 2 as shown by the broken line, engage the shift block 38 of the third shift shaft 36, and then shift the shift lever 9 to the left, the push piece 48 is pushed to the left in FIG. being pushed towards At this time, the first pull-back pin 44 comes out of the recess 42 of the fixed wall 41 and engages with the recess 51 of the pusher piece 48, as shown in FIG. In this way, when the reverse gear shift shaft 34 is pushed to the left, the gear R is moved to the main shaft 3 by the clutch 24 in FIG.
0 to achieve gear engagement with the reverse gear. The rotation of the crankshaft 27 of the engine is caused by the connection of the clutch 28 to the input shaft 29, gear 6, and gear 1.
6. The signal is transmitted to the main shaft 30 via the subshaft 39, the gear 10, the idle gear (not shown), and the gear R.

At this time, the second contact piece 46A of the highest speed shift shaft 35 contacts the right end wall 41a of the fixed wall 41 and does not operate.

Here, the third shift shaft 36 is moved by the gear shift lever 9.
When the gear R is moved to the right in FIG. 2 and returned to the state shown by the broken line, the rotational connection of the gear R with the main shaft 30 by the clutch 24 is released, contrary to the case described above.
At this time, the push piece 48 is returned to the right by the arm 52,
The reverse gear shift shaft 34 is pulled to the right via the first pull-back pin 44 that engages with the recess 51 of the pusher piece 48, and the first abutting piece 46 abuts against the left end wall 41a of the fixed wall 41. It stops when it touches.

Next, to obtain the seventh gear, when the shift lever 9 is moved from the neutral position to the right from the state shown by the broken line in FIG. is pushed to the right and hits the second contact piece 46A in FIG.
5 is pushed to the right. At this time, the second pull-back pin 44A comes out of the recess 42A of the fixed wall 41 and engages with the recess 51A of the push piece 48. In this way, when the highest gear shift shaft 35 is pushed to the right,
The gear 17 is rotationally connected to the countershaft 39 by the clutch 25, and meshing of the gear to the highest gear is achieved. The rotation of the engine's crankshaft 27 is caused by the clutch 28
Through this connection, the signal is transmitted to the main shaft 30 via the input shaft 29, gear 6, gear 16, subshaft 39, gear 17, and gear 7.

At this time, the reverse gear shift shaft 34 is moved to the first contact piece 4
6 comes into contact with the left end wall 41a of the fixed wall 41 and does not operate.

Here, when the gear shift lever 9 is shifted again to the neutral position, the push piece 48 is returned to the left via the arm 52 of the third shift shaft 36, and the depression 51A of the push piece 48 is moved back to the left.
The highest speed shift shaft 35 is pulled to the left via the second pull-back pin 44A that engages with the second pull-back pin 44A, and stops when the second contact piece 46A contacts the right end wall 41a of the fixed wall 41. .

In addition, in the above-mentioned embodiment, an example was described in which a 7-speed transmission is configured from a 6-speed transmission.
The present invention is not limited to this, but can also be applied, for example, to a case where a 4-speed transmission is configured into a 5-speed transmission.

[Effect of the invention] As described above, the shift device for the gear transmission of the present invention has a reverse gear shift shaft and a top gear shift shaft that are slidably fitted into the cylindrical portion of the fixed wall, and when inactive, the fixed First and second abutting pieces are provided that abut on both end walls of the wall, and a pusher piece that slidably engages with the cylindrical part and presses the first and second abutting pieces when a gear shift lever is operated. first and second pull-back pins are slidably fitted in the pin holes provided in the shift shafts in the radial direction, and the recesses in which the first and second pull-back pins are engaged when not in operation are fixed. Since the pushing piece is provided with a recess that is provided in the wall and engages with the first and second pull-back pins during the pressing operation, the first abutment piece and the reverse gear engage when the gear shift lever is operated to the reverse gear. Only the shift shaft operates, and when the shift lever is operated to shift to the highest gear, only the second contact piece and the highest gear shift shaft operate, so that the parts pressed by the pusher piece and their sliding resistance are This has the effect that shifting operations using the gear shift lever can be carried out easily and smoothly.

In addition, the shift device of the transmission of the present invention has a reverse gear shift shaft and a highest gear shift shaft that are slidably fitted in the cylindrical portion of the fixed wall, and a second gear shaft that abuts both ends of the fixed wall when not in operation. 1. A second contact piece is provided, and a push piece is provided that slidably engages the cylindrical portion and presses the first and second contact pieces when the gear shift lever is operated, and is provided on both the shift shafts. Insert the first and second holes into the pin holes.
A pull-back pin is slidably fitted in the radial direction, a recess is provided in the fixed wall in which the first and second pull-back pins are engaged when inactive, and the first and second pull-back pins are engaged during pressing operation. Since a matching recess is provided in the push piece, the highest gear shift shaft can be slidably fitted into the cylindrical portion of the fixed wall into which the reverse gear shift shaft is slidably fitted. Therefore, there is no need to increase the number of shift axes in the select direction, and the speed change operating means of a conventional transmission can be used with minimal changes, so there is an effect that it can be adopted in a conventional transmission.

Furthermore, the gear transmission shift device of the present invention has the following features:
The first and second parts are slidably fitted in the pin holes of the reverse gear shift shaft and the highest speed gear shift shaft in the recesses provided in the pusher piece and the fixed wall in a radial direction.
Since the shift operation is performed by engaging and disengaging the pull-back pin, the mounting portions of the reverse gear shaft and the highest gear shift shaft are concentrated on the fixed wall, making assembly such as positioning of the pin holes easier, and shifting operation is possible. This has the effect of increasing reliability.

[Brief explanation of the drawing]

Figure 1 is a shift pattern diagram of a 7-speed transmission;
The figure is a plan view schematically showing the schematic configuration of a 7-speed transmission equipped with a gear transmission shift device according to the present invention,
Fig. 3 is a partially cutaway side view of the same shift device, Fig. 4 is a front sectional view taken along the line - in Fig. 3, Fig. 5 is a front sectional view taken along the line - in Fig. 6, and Fig. 6 is a front sectional view taken along the line - in Fig. 6. FIG. 3 is a partially cutaway side view showing the operating state of the reverse gear shift shaft in the device. 8...Gear box, 9...Speed lever, 18...Sub-gear box, 21-25...Clutch, 34...Reverse gear shift shaft, 35...Highest speed gear shift shaft, 36...
...Third shift shaft, 41...Fixed wall, 42, 42
A, 51, 51A... recess, 43... cylindrical part,
44, 44A...first and second pull-back pins, 4
6,46A...First and second contact pieces, 48...Press piece, 49...Engagement recess, 52...Arm, 55,55
A...Pin hole.

Claims (1)

[Scope of utility model registration request] The reverse gear shift shaft and the highest gear shift shaft, which are slidably fitted into the cylindrical portion of the fixed wall, are provided with first and second contact pieces that abut against both end walls of the fixed wall when not in operation, and the cylindrical A push piece is provided that is slidably engaged with the shift lever and presses the first and second contact pieces when the gear shift lever is operated, and the first and second pull-back pins are inserted into the pin holes provided in both the shift shafts. A recess is provided in the fixed wall so as to be slidable in the radial direction, and the recess is engaged with the first and second retraction pins when inactive, and the recess is engaged with the first and second retraction pin during pressing operation. A shift device for a gear transmission, wherein the push piece is provided with: