JP2965451B2 - Double meshing prevention device for transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double meshing prevention device for a transmission, and more particularly to a shift restricting hole formed on a shift head of each shift rod, the shift head being provided on the interlock plate. By engaging the shift restricting hole and the select restricting hole formed in the interlock plate by engaging the shift restricting hole and the select restricting hole, the stroke of the shift and the select operation can be restricted so as not to be excessive. The present invention relates to a double meshing prevention device for a transmission that can completely prevent double meshing of the transmission and overstroke of shift and select operations.

[0002]

2. Description of the Related Art Conventionally, in order to prevent double meshing of a transmission, for example, as disclosed in Japanese Utility Model Laid-Open No. 5-42824, a plate called an interlock plate is formed in a direction perpendicular to the axial direction of a shift rod. Slidably mounted on the interlock plate, and a long hole is formed in the interlock plate to engage with the projection of the shift lever engaging groove of the shift head fixed to the shift rod. Only the shift head of the specified shift rod is allowed to slide in the elongated hole, allowing only the specific shift rod to slide, and the other shift rods are prevented from sliding. Has been put to practical use.

According to this device, double meshing of the transmission can be prevented, but it is not possible to prevent the overstroke of the shift operation of the shift select shaft and the overstroke of the shift operation of the shift rod accompanying the shift and select operations. .

That is, the shift select shaft and each shift rod are provided with a lock mechanism including a lock ball and a compression spring for preventing the gear from slipping out.
This is only to prevent the gear from being naturally dropped out due to the vibration of the vehicle, etc., and the driver intentionally or inadvertently pushes the change lever more than necessary and shifts or shifts beyond its normal stroke. When the select operation is performed, the braking capability of the lock mechanism is exceeded, so that the shift select shaft or the shift rod has an overstroke, and in some cases, the transmission may be damaged.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and has as its object to provide a specific operation selected from a plurality of shift rods by a select operation. In a double-engagement prevention device for a transmission provided with an interlock plate slidable in a direction perpendicular to the axial direction of the shift rod so as to restrict the sliding of only the shift rod, a shift fixed to each shift rod is provided. On the same axis as the shift lever engagement groove of the head, a projection that is higher than the projection that forms the engagement groove is formed, and these projections are aligned in the direction perpendicular to the axial direction. The shift lever is formed with an elongated hole to be engaged, and is engaged with the projection of each shift rod on the same line as the longitudinal direction of the elongated hole to reduce the shift stroke of the projection. A shift restricting hole for regulating at both ends of
A select regulating hole is formed which is orthogonal to the shift regulating hole and engages with each projection to regulate a select stroke of the projection at both ends thereof.
In this way, double meshing of gears is prevented with a simple and inexpensive configuration, and the interlock plate shifts in the direction perpendicular to the axial direction of the shift rod when a select operation is performed, and the shift rod shifts when the shift operation is performed. The lever is moved in the axial direction by the lever, and the overstroke of the select operation is restricted by the end of the select restricting hole abutting on the protrusion of the shift head of the shift rod at the extreme end. The stroke is such that the overstroke is regulated by the protrusion of the shift head of the selected shift rod abutting on the end of the shift regulating hole, and thereby the driver intentionally or carelessly. Operation of the shift lever or the select Also to be able to completely prevent overstroke in, it is to eliminate the damage caused by operation error of the transmission.

[0006]

In summary, the present invention is directed to a direction perpendicular to the axial direction of the shift rod so that only a specific shift rod selected from a plurality of shift rods by a select operation is allowed to slide. In a double meshing prevention device for a transmission provided with an interlock plate that is slidable on the shift rod, a shift lever engagement groove of a shift head fixed to each shift rod is formed on the same axis as a projection that forms the engagement groove. Tall projections are formed to align these projections in a direction perpendicular to the axial direction, and the interlock plate is formed with a long hole in which the shift lever is engaged, and is the same as the long direction of the long hole. A shift regulating hole that engages with the projection of each of the shift rods on the line and regulates a shift stroke of the projection at both ends thereof; Wherein the select stroke of engaged protrusion portion on each projecting portion to form a select restriction hole to regulate at both ends, and said interlock plate is a flat plate
It is characterized by being formed .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. A double mesh prevention device 1 for a transmission according to the present invention, as shown in FIGS. 1 to 4, includes a plurality of shift rods, that is, shift rods 2 for first and second speeds, shift rods 4 for third and fourth speeds, An interlock plate 9 slidable in a direction perpendicular to the axial direction of the shift rod so as to restrict the sliding of only a specific shift rod selected from the shift rod 6 for 6th speed and the shift rod 8 for reverse. Is a double meshing prevention device for a transmission provided with a.

The engaging grooves are formed on the same axis as the shift lever engaging grooves 12a, 14a, 16a, 18a of the shift heads 12, 14, 16, 18 fixed to the shift rods 2, 4, 6, 8, respectively. Square projections 12b, 14b, 1
6b, a rectangular protrusion 12 higher than 18b
c, 14c, 16c and 18c are respectively formed and these projections are aligned in a direction perpendicular to the axial direction. Only the shift head 14 of the shift rod 4 is different from other shift heads, and a shift fork 34 Are formed integrally, and shift forks 32, 36, 38 of the other shift rods 2, 6, 8 are attached at predetermined positions as shown in the figure.

The interlock plate 9 has a flat plate shape.
The interlock plate is formed with an elongated hole 9a with which the shift lever 19 is engaged, and each of the shift rods 2, 4, 6, 6 is aligned with the longitudinal direction of the elongated hole.
8 engages with the projections 12c, 14c, 16c, 18c and shifts the shift stroke of the projections at both ends thereof, that is, at the ends 9b,
9c, a shift restriction hole 9d, and a shift restriction hole 9d.
d, and each projection 12c, 14c, 16c,
A select regulating hole 9g which engages with the projection 18c and regulates the select stroke of the protrusion at both ends, that is, at ends 9e and 9f.
Are formed, and the shift control hole 9d and the select control hole 9 are formed.
It is orthogonal to g and is formed as a cross hole.

The width of the elongated hole 9a of the interlock plate 9 is formed slightly wider than the thickness of the shift lever 19,
The length is set to such a length that the tip portion 19a of the shift lever 19 can move by a regular shift stroke. The width of the shift restricting hole 9d of the interlock plate 9 is formed to be slightly larger than the width of each of the projections 12c, 14c, 16c, and 18c, and the length is set to
Each protrusion 1 for the normal shift stroke of 4, 6, 8
2c, 14c, 16c, and 18c are set to have a length that allows them to move in the axial direction.

The width of the select restriction hole 9g of the interlock plate 9 is determined by the width of each of the projections 12c, 14c, 16c, 18c.
The length is set to be a length that allows the interlock plate 9 to be moved by the shift lever 19 by a regular select stroke.

In the upper surface 9h of the interlock plate 9 in the longitudinal direction of the select regulating hole 9g, through holes 21a and 22a are provided.
A pair of pipes 21 and 22 each having a predetermined length formed thereon are fixed by means of welding or the like, and slide on a pair of pins 28 and 29 fixed to a transmission case 24 by bolts 25 via fixing plates 26. It is configured to fit movably.

When the interlock plate 9 is assembled, as shown in FIG. 3, the shift lever 19 fixed to the shift select shaft 20 penetrates the elongated hole 9a and the tip 19a is moved to the shift heads 12, 14 respectively. , 1
6, 18 are engaged with any one of the engagement grooves 12a, 14a, 16a, 18a, and each of the projections 12b, 14b, 16b,
Reference numeral 18b is located below the interlock plate 9 so as not to interfere therewith, and only the respective projections 12c, 14c, 16c and 18c protrude upward and engage with the shift restriction holes 9d and the selection restriction holes 9g. Have been.

In FIG. 1, shift select shaft 2
0, a change lever 30 is connected via various rods or the like (not shown).
It is configured to engage with a so-called H-shaped shift guide plate 31 and perform shift and select operations along the guide groove 31a.

The present invention is configured as described above,
Hereinafter, the operation will be described. Since the pipes 21 and 22 are slidably fitted to the pins 28 and 29, the interlock plate 9 can move in the axial direction of the pins 28 and 29. Since each shift rod 2 is fixed to the case 24,
It cannot move in the 4, 6, 8 axial directions.

Therefore, first, the stroke regulation in the shift operation will be described with reference to FIG. 5. If the change lever 30 (FIG. 1) is selected and the shift lever 19 selects the shift rod 4 for 3-4 speed, for example. The tip portion 19a engages with the engagement groove 14a of the shift head 14, and when a shift operation is performed by the change lever 30, the shift select shaft 20 rotates, for example, in the direction of arrow A, and as a result, the shift The lever 19 moves freely in the elongated hole 9a of the interlock plate 9, and the tip 19a moves the shift rod 4 in the direction of arrow B via the projection 14b of the shift head 14.

When the shift rod 4 moves by the regular stroke, the shift operation is completed. At this time, the projection 14c of the shift head 14 moves from the position of the imaginary line to the position of the solid line to move the end of the shift regulating hole 9d. When it comes into contact with the portion 9b, it cannot move any more.

Therefore, even if the driver intentionally or inadvertently shifts the change lever 30 in the same direction with a strong force, the interlock plate 9 does not move, so that no overstroke of the shift operation occurs. .

This is the same when any of the other shift rods 2, 6, and 8 is selected by the select operation, whereby the overstroke of the shift operation can be completely prevented. There is no danger of intentionally or inadvertently causing overstroke and damage, and at the same time double meshing can be prevented.

Next, the stroke regulation of the select operation will be described with reference to FIG. 6. When the select operation is performed by the change lever 30, the shift select shaft 20 moves in the direction of arrow C or D in FIG. When it further moves in the direction of arrow C from the state, the shift lever 1
9 moves along with the interlock plate 9 via the elongated hole 9a, and the tip portion 19a engages with the engaging groove 18a of the shift head 18 of the shift rod 8.

At this time, the interlock plate 9 has an arrow E
If the shift lever 30 is moved by a regular stroke, the end 9f of the select restricting hole 9g becomes the protruding portion of the shift head 16 at the end as shown in FIG. 16c so that it cannot move any more.

Therefore, even if the driver intentionally or inadvertently selects the change lever 30 in the same direction with a strong force, the interlock plate 9 does not move integrally with the shift rod 6. The overstroke of the select operation never occurs.

This also applies to the case where another shift rod 6 is selected by a select operation as shown in FIG. 7. In this case, the interlock plate 9 moves in the direction of arrow F, and After moving by the stroke, the end 9e of the select restriction hole 9g of the interlock plate 9 is moved.
Is in contact with the projection 18c of the shift head 18 at the end, and cannot move any more. Similarly, since the interlock plate 9 does not move integrally with the shift rod 8, the overstroke of the select operation is never performed. Does not occur.

In the state shown in FIG. 7, when a shift operation is performed and the shift rod 6 moves by a regular stroke in the direction of arrow G, the projection 16c of the shift head 16 is moved.
Abuts on the end 9b of the shift restricting hole 9d and becomes unable to move any more. Similarly, the overstroke of the shift operation can be completely prevented.

Thus, according to the present invention, not only double meshing of the gears can be prevented, but also the overstroke of the shift and select operations can be completely prevented, and the transmission can be intentionally or inadvertently operated by the driver. There is no danger of being damaged by the stroke.

[0026]

As described above, according to the present invention, the shift rod is slid in the direction perpendicular to the axial direction of the shift rod so as to restrict the sliding operation of only the specific shift rod selected from the plurality of shift rods by the select operation. In a double meshing prevention device for a transmission provided with a movable interlock plate, a projection higher than a projection forming the engagement groove on the same axis as a shift lever engagement groove of a shift head fixed to each shift rod. Parts are formed to align these protrusions in the direction perpendicular to the axial direction. On the interlock plate, a long hole for engaging the shift lever is formed, and each of the protrusions is aligned with the longitudinal direction of the long hole. A shift regulating hole which engages with the projection of the shift rod and regulates a shift stroke of the projection at both ends thereof; The select stroke parts to form a select restriction hole to regulate at both ends, and Intaro'
Because the plate is formed in a flat plate, it is inexpensive and simple.
With this configuration, double meshing of gears can be prevented, and when performing a select operation, the interlock plate moves in the direction perpendicular to the axial direction of the shift rod, and when performing a shift operation, the shift rod moves in the axial direction by the shift lever, and The overstroke is restricted by the end of the select restriction hole abutting on the projection of the shift head of the shift rod at the extreme end, and the overstroke of the shift operation is the overstroke of the shift head of the selected shift rod. Since the protrusion comes into contact with the end of the shift restriction hole, the overstroke is restricted, and as a result, the driver intentionally or inadvertently operates the change lever more than necessary and exceeds the regular stroke. The overstroke can be completely prevented in either shift or select operation, There is an effect that it is possible to eliminate the damage caused by ® emissions of operational errors.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional perspective view showing a mutual relationship between a double mesh prevention device of a transmission and a change lever.

FIG. 2 is a plan view of a double meshing prevention device for a transmission.

FIG. 3 is a perspective view of a double meshing prevention device of a transmission.

FIG. 4 is an exploded perspective view of the transmission double meshing prevention device.

FIG. 5 is a partial longitudinal sectional side view showing a state in which an overstroke of a shift operation is prevented.

FIG. 6 is a plan view showing a state in which an overstroke of a select operation is prevented.

FIG. 7 is a plan view showing a state in which an overstroke of a shift and a select operation is prevented.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Double transmission prevention device for transmission 2 Shift rod 4 Shift rod 6 Shift rod 8 Shift rod 9 Interlock plate 9a Long hole 9b End 9c End 9d Shift restriction hole 9e End 9f End 9g Select restriction hole 12 Shift head 12a engagement groove 12b projection 12c projection 14 shift head 14a engagement groove 14b projection 14c projection 16 shift head 16a engagement groove 16b projection 16c projection 18 shift head 18a engagement groove 18b projection 18c projection 19 shift lever

Claims (1)

(57) [Claims] An interlock plate slidable in a direction perpendicular to the axial direction of the shift rod so as to restrict sliding of only a specific shift rod selected from a plurality of shift rods by a select operation. In the anti-double meshing device of the transmission provided, a projection higher than the projection forming the engaging groove is formed on the same axis as the shift lever engaging groove of the shift head fixed to each shift rod. Are aligned in the direction perpendicular to the axial direction, the interlock plate is formed with a long hole with which the shift lever is engaged, and the protrusion of each of the shift rods is aligned with the longitudinal direction of the long hole. A shift restricting hole for restricting the shift stroke of the projection at both ends thereof, and a shift control hole orthogonal to the shift restricting hole and engaging with each of the protrusions. A select restriction hole for restricting the rect stroke at both ends thereof, and
The transmission is formed in a flat plate shape, wherein the transmission has a double meshing prevention device.