JPH0643568Y2 - Interlock mechanism of gear shifter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an interlock mechanism of a gear shifter in a manual transmission for an automobile or the like.

[Conventional technology]

Generally, as an operation mechanism of a manual transmission, for example, when the transmission is provided near the driver's seat as in the FR system, the shift lever of the transmission having a grip portion at the upper end can be moved in any direction. It is generally used that the middle portion of the shift lever is supported so as to be swingable and the lower end of the shift lever is engaged with the shift rod. This operating mechanism has a plurality of shift rods, and each shift rod is equipped with a shifter for gear sliding that moves almost vertically downward, and by operating the shift lever in the front, rear, left, and right directions, Any one of the shifters is selectively slid to change the gear combination, and the gear shift operation is performed.

At this time, if two or more shift rods are slid at the same time, double meshing of the transmission gears will occur. Therefore, simultaneous sliding of multiple shift rods is prevented and one shift rod is slid for safety. An interlock mechanism is provided so that other shift rods cannot be slid when they are moved.

Conventionally, as an interlock mechanism, as shown in FIG.
There is one as shown in FIG.
This interlock mechanism is applied to an operation mechanism having two shift rods, and two shift rods 41 and 42 are slidably provided in a housing 40 of a manual transmission, and both shift gears are provided. Between the rods 41, 42, both shift rods 41,
An interlock pin 43 extending vertically to 42 is provided.

Mating groove 4 on the side 44, 45 of each shift rod 41, 42
6, 47 are formed, and the spherical portions 48, 49 formed at the respective ends of the interlock pin 43 fit into the fitting grooves 46, 47.
The length of the interlock pin 43 is shorter than the distance between the bottoms of the fitting groove 46 and the fitting groove 47, and the side surface 44 of the shift rods 41, 42 is
And the side surface 45 are formed longer than the distance.

The cross-sectional shapes of the fitting grooves 46, 47 in the plane including the shift rods 41, 42 and the interlock pin 43 are arcuate,
The radius of curvature of the arc is the spherical portion 4 of the interlock pin 43.
It is formed longer than the radius of curvature of 8,49. For this reason,
When the shift rods 41 and 42 are slid, the interlock pin 43 can be given a thrust in the axial direction with a small operating force.

Since the conventional interlock mechanism has the above-mentioned structure, as shown in FIG. 5, the two shift rods 41, 42 are
When the slide rods 41 and 42 are simultaneously slid, both shift rods 41 and 42 are locked by the wedge action of the fitting grooves 46 and 47 of the shift rods 41 and 42 with respect to the spherical portions 48 and 49 of the interlock pin 43. Therefore, simultaneous sliding of the two shift rods 41, 42 is prevented.

Further, when only one shift rod 41 is slid, the interlock pin 43 is pushed leftward by the wedge action of the fitting groove 47 of the shift rod 41. Then, at the same time when the engagement groove 47 of the one shift rod 41 and the spherical portion 49 of the interlock pin 43 are disengaged, the other shift rod 42
The spherical portion 48 of the interlock pin 43 is fitted into the fitting groove 46 of. As a result, the other shift rod 42 is locked and cannot be slid.

The above example has been described by taking the operation mechanism of the transmission having three forward gears and one reverse gear as an example, but also in the case of four forward gears and five forward gears,
The relationship between the spherical portion of the interlock pin and the fitting groove of the shift rod is the same as in the case of three forward stages, for example, forward 5
As the operating mechanism of the transmission with 1 speed and 1 reverse speed,
Some are disclosed in Japanese Patent Publication No. 0954. This will be outlined with reference to FIG.

As shown in FIG. 6, four shift rods 55, 56, 57, 58 are required. The interlock pin 64 is between the shift rod 55 and the shift rod 56, the interlock pin 65 is between the shift rod 56 and the shift rod 57, and the interlock pin 66.
Are arranged between the shift rod 57 and the shift rod 58.

Further, an interlocking member 68 penetrating the shift rod 56 is disposed so as to abut between the interlock pin 64 and the interlock pin 65.
An interlocking member 69 penetrating the shift rod 57 is disposed in contact with 66. This allows the interlock pin
64, 65, 65, 66 are configured to be movable in the operating row direction by interlocking members 68, 69. The other structure and operation of this interlock mechanism are similar to those of the three forward stages.

[Problems to be solved by the invention]

However, in the conventional interlock mechanism, as shown in FIG. 4 (b), after the sliding operation of one shift rod 41, there is a large amount of rattling until the locking operation of the other shift rod 42, and the accuracy is low. There is a problem.

The cause of this problem is that when one spherical surface portion 49 of the interlock pin 43 rides on the side surface 45 of the one shift rod 41, the other spherical surface portion 48 and the fitting groove 46 of the other shift rod 42. Since there is a gap between and, and the radius of curvature of the circular arc of the cross section of the fitting groove 46 is formed to be larger than the radius of curvature of the spherical portion 48, even if there is a slight gap, the lock operation can be performed. It can be said that the backlash becomes considerably large.

Therefore, an object of the present invention is to solve the above-mentioned problem, in which the interlock pin is always brought into contact with one shift rod, and the other shift rod and the interlock pin are engaged with each other with almost no gap. By doing so, the amount of backlash until the shift rod is locked can be reduced,
An object is to provide an interlock mechanism of a gear shifter with improved accuracy.

[Means for solving problems]

The present invention is configured as follows in order to achieve the above object. That is, the invention is such that the first shift rod and the second shift rod slidably provided in the housing and the through hole having the shoulder portion formed in the housing between the first shift rod and the second shift rod are slidable. An interlock pin movably disposed, one end of which is formed into a spherical portion and the other end of which is formed into a flat end surface, and which is provided with a shoulder portion, which is provided on a side surface of the first shift rod with which the flat end surface is fitted. A square groove, a fitting groove having an arcuate cross section provided on a side surface of the second shift rod into which the spherical portion fits, and a shoulder portion of a through hole formed in the housing and the interlock pin. The present invention relates to an interlock mechanism for a gear shifter, which includes a spring that is disposed between the shoulder portion and biases the interlock pin toward the second shift rod.

In the interlock mechanism of this gear shifter, the square groove is formed in a U-shaped cross section.

Further, in the interlock mechanism of this gear shifter, a steel ball is provided on the spherical portion.

[Action]

Since the present invention is constructed as described above, it works as follows. Since the interlock pin is always biased toward the second shift rod by the biasing means such as a compression spring, when the first shift rod and the second shift rod are in the neutral position, the interlock pin has a spherical shape. The portion is fitted in the fitting groove having an arcuate cross section of the second shift rod, and the other end of the interlock pin is located in the through hole. When the second shift rod is slid from this state, the interlock pin receives a thrust force toward the first shift rod side along the arcuate cross-section fitting groove of the second shift rod against the biasing means.

As a result, as one end of the interlock pin rides on the side surface of the second shift rod, the other end of the interlock pin fits into the square groove formed in the first shift rod, and the first shift rod. Is locked.
Since the end face shape of the other end of the interlock pin is formed as a flat end face, when the end portion of the interlock pin is fitted in the square groove of the first shift rod, the distance to the lock is maximized. Can be shortened. The amount of backlash of the first shift rod when locked can be reduced by setting the diameter of the interlock pin and the width of the square groove of the first shift rod.

〔Example〕

An embodiment of an interlock mechanism for a gear shifter according to the present invention will be described below with reference to the drawings. 1 and 2
In the figure, an interlock mechanism of a gear shifter is shown, and the first shift rod 1 and the second shift rod 2 are provided slidably with respect to a housing 3 of a manual transmission.

A square groove 4 having a U-shaped cross section is provided on the side surface of the first shift rod 1, and a fitting groove 5 having an arc-shaped cross section is provided on the side surface of the second shift rod 2. A through hole 6 is formed in the housing 3 between the shift rods in the plane including the first shift rod 1 and the second shift rod 2 so as to be perpendicular to the shift rods. The pin 7 is slidably arranged.

The interlock pin 7 comprises a large-diameter portion 8 and a small-diameter portion 9, and a shoulder portion 10 is formed at a boundary portion between them. A spherical portion 14 is formed at the tip of the large diameter portion 8, and the spherical portion 14 fits into the fitting groove 5 of the second shift rod 2. The end surface of the small-diameter portion 9 has a flat end surface with respect to the longitudinal direction, and has a square cross-section so that the small-diameter portion 9 can be fitted into the square groove 4 of the first shift rod 1. ing. Then, the interlock pin 7 is inserted into the square groove 4 of the first shift rod 1.
The distance to the lock can be shortened as much as possible when the end of the flat end face of is fitted.

In order to smoothly guide the small diameter portion 9 of the interlock pin 7 to the square groove 4, the edge of the square groove 4 or the small diameter portion 9 is formed.
It is also possible to chamfer at least one of the tips.

Through hole 6 of housing 3 in which interlock pin 7 slides
Also, a complementary large-diameter portion and a small-diameter portion are similarly formed in accordance with the outer shape of the interlock pin 7, and a shoulder portion 11 is formed at a boundary portion between them.
Are similarly formed. A compression spring 12 is provided between the shoulder 11 of the housing 3 and the shoulder 10 of the interlock pin 7, and the compression spring 12 has a through hole 6 in the housing 3.
It is configured to be able to expand and contract inside. Therefore, the interlock pin 7 is constantly urged to the second shift rod 2 side by the action of the compression spring 12, and the first shift rod 1 and the second shift rod 2 are in the neutral position shown in FIG. The spherical portion 14 formed at the tip of the large diameter portion 8 is fitted in the fitting groove 5 of the second shift rod 2, and the tip of the small diameter portion 9 is positioned in the through hole 6.

FIG. 3 shows another embodiment of the interlock mechanism of the gear shifter according to the present invention. In the interlock mechanism of this gear shifter, a concave portion 15 is formed at the tip of the large diameter portion 18 of the interlock pin 17, and the concave portion 15 is formed.
The steel ball 13 is fitted into the shaft, and the steel ball 13 functions as a rolling bearing between the interlock pin 17 and the shift rod 2.
Thereby, the sliding resistance of the second shift rod 2 can be reduced.

When the present invention is applied to a shift rod having three or more shift rods, the shift rods adjacent to both sides of the interlock pins 7 and 17, for example, both interlock pins shown in FIG. It goes without saying that the interlocking members that come into contact with each other may be arranged so as to be movable in the axial direction of the interlock pin.

Next, the operation of the interlock mechanism of the gear shifter according to the present invention will be described. As shown in FIG. 1, since the interlock pin 7 is constantly biased toward the second shift rod 2 by the compression spring 12, the spherical portion 14 of the interlock pin 7 is fitted to the second shift rod 2. When fitted in the groove 5, the second shift rod 2 is locked. At this time, since the first shift rod 1 is not engaged with the interlock pin 7, the sliding operation can be performed with a light force.

As shown in FIG. 2 from the state of FIG. 1, when the second shift rod 2 is slid, the fitting groove 5 of the second shift rod 2 is inserted.
The interlocking pin 7 is pushed to the left by the wedge action of and rides on the side surface of the second shift rod 2 at the same time.
The small diameter portion 9 of the interlock pin 7 is fitted into the square groove 4 formed in the first shift rod 1. Thus, when the second shift rod 2 is slid, the first shift rod 1 is locked and cannot be slid.

When the two shift rods 1 and 2 are slid at the same time, the interlock pin 7 moves to the left due to the wedge action of the fitting groove 5 of the second shift rod 2, but the interlock pin 7
The tip of the small diameter portion 9 comes into contact with the side surface of the first shift rod 1 and the movement of the first shift rod 1 is blocked. As a result, the fitting groove 5 of the second shift rod 2 and the interlock pin The engagement with 7 cannot be completely disengaged, and the second shift rod 2 remains locked. On the other hand, the first shift rod 1 is also locked by the pressure contact force of the interlock pin 7. Therefore, it becomes impossible to slide the two shift rods 1 and 2 at the same time.

[Effect of device]

Since the interlock mechanism of the gear shifter according to the present invention is configured as described above, it has the following effects. That is, the engaging surface between the first shift rod and the interlock pin is not arcuate, but a square groove having a U-shaped cross section is formed on the side surface of the first shift rod, and the end portion of the interlock pin is a flat end surface. Since the interlock pin is formed into a structure in which the interlock pin is fitted in the square groove, when the interlock pin is fitted in the square groove of the first shift rod, Even if an external force acts on the shift rod, a lateral thrust is not generated on the interlock pin. Therefore, there is an advantage that the indentation of the interlock pin is not attached to the second shift rod.

Further, since the end face shape of the other end of the interlock pin is formed as a flat end face, when the end portion of the flat end face of the interlock pin is fitted into the square groove of the first shift rod, the lock is performed. The distance to can be shortened as much as possible.

Further, when the second shift rod is slid while the first shift rod is in a shifted state, the flat end surface of the tip of the small diameter portion of the interlock pin comes into contact with the side surface of the first shift rod. Therefore, there is also an advantage that it is more difficult to make an indentation of the interlock pin on the first shift rod, as compared with a case where the tip of the interlock pin is spherical.

Further, since the interlock mechanism is disposed between the first shift rod and the second shift rod and the number of constituent parts is small, the operation is reliable and the cost can be reduced.

[Brief description of drawings]

1 is a sectional view showing an embodiment of an interlock mechanism of a gear shifter according to the present invention, FIG. 2 is a sectional view showing a state where one shift rod is shifted in the interlock mechanism of the gear shifter of FIG. 1, 3 The figure is a sectional view showing another embodiment of the interlock mechanism of the gear shifter according to the present invention,
FIG. 4 (a), FIG. 4 (b) and FIG. 5 show an example of the interlock mechanism of the conventional gear shifter, in which one shift rod is slid in the operation mechanism of the forward three-speed transmission. FIG. 6 is a cross-sectional view showing an interlock mechanism before and after a sliding operation, and FIG. 6 is a cross-sectional view showing an example of an interlock mechanism of a conventional gear shifter in an operation mechanism of a transmission with five forward gears. 1 ... 1st shift rod, 2 ... 2nd shift rod, 3
…… Housing, 4 …… Square groove, 5 …… Mating groove, 6 …… Through hole, 7,17 …… Interlock pin, 8,18 …… Large diameter part, 9
...... Small diameter part, 10,11 ...... Shoulder part, 12 ...... Compression spring (biasing means), 13 ...... Steel ball, 14 ...... Spherical part, 15 ...... Concave part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 59-164442 (JP, A) JP 60-211165 (JP, A) JP 56-147961 (JP, A) JP 53- 61823 (JP, A) JP 52-153066 (JP, A) Actual opening 48-50776 (JP, U) Actual opening 50-104327 (JP, U) Actual opening 50-145970 (JP, U) Actual Development Sho 61-7663 (JP, U)

Claims (3)

[Scope of utility model registration request] 1. A first shift rod and a second shift rod slidably mounted on a housing, and the first shift rod and the second shift rod.
An interlock pin slidably disposed in a through hole having a shoulder formed in the housing between the shift rods, one end of which is formed into a spherical portion and the other end of which is formed into a flat end surface and which has a shoulder, Square groove provided on the side surface of the first shift rod with which the flat end surface fits, arc-shaped cross-section fitting groove provided on the side surface of the second shift rod with which the spherical portion fits, and the housing A spring disposed between the shoulder portion of the through hole formed in the above and the shoulder portion formed in the interlock pin and biasing the interlock pin toward the second shift rod side. The interlock mechanism of the gear shifter. 2. The interlock mechanism for a gear shifter according to claim 1, wherein the square groove is formed in a U-shaped cross section. 3. An interlock mechanism for a gear shifter as set forth in claim 1, wherein a steel ball is provided on the spherical portion.