JPH0244133Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a reverse shift device for a manual transmission for an automobile having an even number of forward gears.

[Conventional technology]

BACKGROUND ART Conventionally, in a manual transmission for an automobile, when the number of forward gears is multiple, for example three, two forkshafts are installed, and each forkshaft has a fork attached to it, respectively. The shift position is set by the fork of the first fork shaft to the first speed or the second speed, and the shift position is set to the third speed or reverse by the fork of the second fork shaft. Also, if there are 5 forward gears, 3
Two forkshafts are installed, and the fork of the first forkshaft sets the first or second gear, the fork of the second forkshaft sets the third or fourth gear, and the fork of the third forkshaft sets the fork of the third or fourth gear. It is designed to be set to the fifth gear or reverse shift position.

In such a manual transmission for an automobile having an odd number of forward gears, the reverse shift position can be set using any one of the fork shafts.

[Problem that the invention attempts to solve]

However, in the case of an automobile manual transmission with an even number of forward gears, for example 4 or 6 gears, each forkshaft for the forward gears is used for shifting the forward gears, so it is necessary to use a separate one for shifting the reverse gears. It was necessary to provide a dedicated forkshaft. For this reason, there were problems such as a complicated structure, a large size, and an increase in weight.

The purpose of the present invention is to solve these problems and provide a reverse shift device that can eliminate the need for a reverse-only fork shaft in an automobile manual transmission with an even number of forward gears. be.

[Means for solving problems]

In order to achieve such an object, the present invention provides a reverse shift device for a manual transmission for an automobile with an even number of forward gears, which is provided with a plurality of forkshafts for forward gears, and is provided with a reverse shift device that is slidably supported on at least two of the forkshafts. and is provided with a reverse shift fork that moves independently along the axial direction of the fork shaft during reverse shifting.

[Effect]

According to the above-mentioned configuration, during a reverse shift, the reverse shift fork can independently move in the axial direction on the forward gear fork shaft to the position where reverse is selected, and the reverse shift can be performed.

〔Example〕

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

The manual transmission 1 for an automobile according to the present invention is provided with, for example, six forward gears from the first gear to the sixth gear and a reverse gear.

A shift and select lever shaft (hereinafter referred to as select shaft) 2 is supported so as to be able to slide and rotate in the axial direction in conjunction with the operation of a shift lever (not shown). The shift inner lever 5 has a base 5a fixed to the select shaft 2, and a protrusion 5b protruding downward perpendicular to the axis of the select shaft 2 is formed in the center of the base 5a. Further, the tip of the protrusion 5b is formed in a semicircular shape.

The interlock plate 6 has a rectangular cross section and is located at the base 5a of the shift inner lever 5.
It is supported on the select shaft 2 so as to sandwich both ends thereof, and a notch 6a is formed in the lower surface of the shift inner lever 5 into which the projection 5b of the shift inner lever 5 is inserted and projected. In addition, as shown in FIG. 1, the left end surface of the interlock plate 6 and the case 3
and between the case 3 and the select shaft 2 on the right end side of the interlock plate 6.
A compression spring 8 (one not shown) is interposed, and the select shaft 2 is always biased to return to a predetermined position.

A first forkshaft 9 for first and second speeds, a second forkshaft 10 for third and fourth speeds, and a third forkshaft 11 for fifth and sixth speeds, respectively. It is fitted into the case 3 perpendicularly to the select shaft 2 so as to be able to slide in the axial direction, and these fork shafts 9, 1
0 and 11 are provided with first, second, and third shift forks 13, 14, and 15. The lower surface of the shift inner lever 5 is fitted into the upper part of these shift fork shafts 9, 10, 11.
Letter-shaped head portions 13a, 14a, and 15a are provided. These head parts 13a, 14a, 1
5a is configured such that when the select shaft 2 slides in the axial direction by operating the shift lever, a protrusion 5b of the shift inner lever 5 is selectively engaged.

Further, as shown in FIG.
0) are provided respectively, and the shift positioning mechanism 16
A small V-shaped groove 10a formed at the end of the case 3, a large V-shaped groove 10b arranged left and right along the axial direction sandwiching the V-shaped groove 10a, and a hollow cylindrical member 18 embedded in the case 3. Ball 2 accommodated in
0, and the ball 20 is pressed by a compression spring 21 housed in the cylindrical member 18, so as to selectively engage with the V-shaped groove 10a or 10b.

As shown in FIG. 1, with the protrusion 5b of the shift inner lever 5 engaged with the head 14a of the second shift forkshaft 10, operate the shift lever to shift the select shaft 2 to either position. When rotated in the direction, the second forkshaft 1 in the neutral state as shown in FIG.
0 slides leftward or rightward, and the second shift fork 14 moves to a position for selecting a gear stage, either the third shift position or the fourth shift position,
A sleeve of a synchronized mesh mechanism (not shown) that engages with the shift fork 14 is moved to switch forward gears. At the same time, the ball 18 is fitted into either one of the V-shaped grooves 10b. Note that the configuration for selecting other gears and changing gears is also the same, and the explanation will be omitted since it will be redundant.

The reverse shift device 25 includes a reverse shift fork 26, a reverse shift arm 28, a reverse select restricting mechanism 30, and a reverse shift positioning mechanism 31.

The reverse shift fork 26 has a base 32
It consists of a head part 33 and an arm part 34, and the base part 32 is formed with large and small side walls 32a and 32b facing each other in a U-shape as shown in FIG. Bushes 55a and 55b are fitted into the side walls 32a and 32b, respectively, and have holes 32c with a slight gap in the third fork shaft 11.
Furthermore, a first fork shaft 9 is mounted on the side wall 32a.
A bush 55c having a hole 32d with a slight gap is fitted therein.

The head portion 33 and the arm portion 34 are integrally fixed to the base portion 32, and the upper end of the head portion 33 is formed into a U-shape like the fork shafts 9 and 10, as shown in FIG. , other head section 13
a, 14a, and 15a, and the lower surface of the interlock plate 6 is fitted therein.

As shown in FIG. 1, the reverse shift arm 28 is mounted on a mounting base 36 whose upper portion is fixed to the case 3.
It is pivoted to by a pivot 38, and at the bottom,
A shoe 40 is rotatably attached. The shoe 40 is fitted into a groove of a reverse idler gear 43 that is slidably fitted into an idler gear shaft 41 fixed to the case 3. Accordingly, it slides on the idler gear shaft 41 via the shoe 40 and meshes with reverse gears 48 and 49 on the input shaft 45 and output shaft 46, which are rotatably supported by the case 3. There is. Further, a hole 28a is formed in the intermediate portion of the reverse shift arm 28, and the reverse shift fork 2 is provided in the hole 28a.
An engaging portion 34a formed at the tip of the arm portion 34 of No. 6 is fitted into the engaging portion 34a. The thickness of the engaging portion 34a is set smaller than the length of the hole 28. Further, both ends of the engaging portion 34a are formed in a semicircular shape.

As shown in FIG. 1, the reverse select restricting mechanism 30 includes a protrusion 50 fixed to the left end surface of the interlock plate 6, and a protrusion 50 at the tip.
0 (hereinafter referred to as "restrictive pin") 51. The restricting pin 51 is housed in a hollow chamber (not shown) formed in a screw member 53 fixed to the case 3 by a nut 52, and a compression spring (not shown) housed in the hollow chamber. ), and is normally held in a position where the tip can engage with the protrusion 50.

The protrusion 50 is configured not to engage the restricting pin 51 in a section where the protrusion 5b of the shift inner lever 5 engages with the head portion 13a, 14a or 15a to select the forward gear.
Now, when the select shaft 2 is operated and slid to the leftmost side to select reverse, the restricting pin 51 comes into contact with the inclined portion 50a of the protrusion 50. Furthermore, when the operating force is increased to move the select shaft 2 to the left, the restrict pin 51 is pushed up by the inclined portion 50a of the protrusion 50 as the shaft moves, and at the same time, the shift inner lever 5 is pushed up. The protrusion 5b engages with the reverse head 33 to maintain the reverse select position.

As shown in FIG. 3, the reverse shift positioning mechanism 31 includes a ball 53 housed in a hollow chamber 3a formed in the case 3 with a portion exposed to the outside. In addition, the reverse shift arm 28 has
Two V-shaped grooves 28c are bored in the fan-shaped arc portion 28b formed around the axis of the pivot 38, and the ball 53 is inserted into the hollow chamber 3 in the V-shaped grooves 28c.
They are alternatively press-fitted by a compression spring 54 housed in a.

Next, the operation of the embodiment of the present invention will be explained.

First, as shown in FIG. 1, the projection 5b of the inner shift lever 5 is engaged with the head 14a, that is, the gears at the third and fourth shift positions are selected. The case where the reverse gear stage is selected based on the state will be explained.

In FIG. 1, when the select shaft 2 is slid to the leftmost (reverse) position by the shift lever against the spring pressure of the compression spring 8 and the spring pressure of the restricting mechanism, the protrusion 5b of the shift inner lever 5 engages with the head portion 33. In this state, as shown in FIG. 3, the ball 53 is pressed into engagement with the lower V-shaped groove 28c of the reverse shift arm 28, and the reverse idler gear 43 is disposed at the position shown by the solid line.

Next, a case will be described in which the reverse gear stage is shifted from the above state. When the select shaft 2 is rotated in the direction of arrow A (see FIG. 1) by operating the shift lever, the reverse shift fork 26 moves to the first and third positions via the projection 5b of the shift inner lever 5 and the head 33.
It moves along the axis on the forkshafts 9 and 11 of. At this time, reverse shift fork 26
The reverse shift fork 26 swings slightly, but this swing causes the holes 32c, 32 in the base 32 of the reverse shift fork 26 to
d the first and third forkshafts 9, 11
Since it is loosely fitted with a small gap, it can be done smoothly. Also reverse shift fork 2
6 is supported by the first and third fork shafts 9 and 11 with a slight gap, so that the engagement between the protrusion 5b of the shift inner lever 5 and the reverse head 33 is good. Retained.

When the reverse shift fork 26 moves as described above, the reverse shift arm 28
4 in the direction of arrow B in FIG.
The ball 53 is press-fitted to 8c. At the same time, the reverse idler gear 43 moves through the shoe 40 to the position shown in the imaginary line, and the reverse gears 48, 4
It will mesh with 9. In this way, the gear is shifted to the reverse gear.

In this embodiment, the reverse shift fork 26 is connected to the first and third fork shafts 9, 1.
1, but it may be supported by one of the forkshafts and the second forkshaft 10. Furthermore, the first to third fork shafts may be used to support three axes.

[Effect of idea]

As described above, according to the present invention, there is no need for a forkshaft exclusively for reverse, so the structure is simplified, compact, and lightweight.

[Brief explanation of the drawing]

The drawings relate to an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of a reverse shift device of a manual transmission for an automobile;
Fig. 2 is a cross-sectional view showing the interrelationship between the forward shift positioning mechanism and its surrounding parts, Fig. 3 is a longitudinal sectional view showing the interrelationship between the reverse shift moderation mechanism and its surrounding parts, and Fig. 4 5 is a front view showing the state of the reverse shift forks attached to the first and third fork shafts, and FIG. 5 is a plan view of the structure shown in FIG. 4. 1... Automobile manual transmission, 9, 10, 11...
...first, second and third forkshafts, 2
5... Reverse shift device, 26... Reverse shift fork.

Claims (1)

[Scope of utility model registration request] In a reverse shift device for a manual transmission for an automobile with an even number of forward speeds, which is provided with a plurality of forkshafts for forward speeds, the forkshafts are slidably supported by at least two of the forkshafts, and the shaft of the forkshaft is moved during a reverse shift. A reverse shift device for a manual transmission for an automobile, characterized in that a reverse shift fork that moves independently along a direction is provided.