JPH07332486A - Shift mechanism for manual transmission - Google Patents

Abstract

PURPOSE:To improve facility in terms of operation and to prevent lowering of efficiency occasioned by incurring of a slide loss by a method wherein a contact part making contact with the different spots in a longitudinal direction of the two leg part of a torsion spring is arranged in the different position in a longitudinal direction of a lever fixed on a first or a second shaft. CONSTITUTION:Since, when a shift lever is selected, a first shaft 1 is rotated, a second lever 4 engaged with a first lever 3 fixed on the first shaft 1 is rotated around a second shaft 2. The two leg part of a torsion spring 5 fixed on the first shaft 1 or the second shaft 2 and the contact in a different position in a longitudinal direction of the lever fixed on the other of the first and second shafts 1 and 2 is brought into contact according to rotation of the level. Thereby, the length and the load of the effective arm of the lever are changed, whereby a select return force is differed. Further, since a plurality of contact parts are brought into contact with the two leg parts of the torsion spring 5 according to rotation of the lever, the length and the moment of the effective arm of the lever are changed and a select return force is changed, whereby facility is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention realizes a different select return force by changing the effective arm length by selectively abutting both legs of a torsion spring and a pin at each select point. The present invention relates to a manual transmission shift mechanism that prevents a reduction in shift efficiency due to loss.

[0002]

2. Description of the Related Art In a conventional manual transmission shift mechanism, a spherical body C at the tip of a change lever L is inserted into a hole H provided at an end E of a control lever K as shown in FIGS. A coil spring S wound around the control lever K is arranged in a plow shape with respect to the change lever L, and one end O of the coil spring S is pressed against the stopper portion P of the end E from the outside and the other end T thereof is Are attached so as to contact both sides of the tip end portion of the change lever L, and a return force is applied to the change lever L.

[0003]

In the conventional shift mechanism described above, the other end T of the coil spring S abuts one of both sides of the tip end portion of the change lever L in accordance with the select direction to cause the change. Since the return force is applied to the lever L, the select return force is the same regardless of the select direction, and there is a problem in that the usability is poor in operation.

Further, in the above conventional shift mechanism, when the change lever L is shifted, the angle formed by the control lever K and the change lever L changes according to the shift direction, so that the coil spring S and the change are changed. There has been a problem that slippage occurs with the lever L, slippage occurs, and shift efficiency decreases.

Therefore, the inventors of the present invention obtain different select return forces by selectively abutting both legs of the torsion spring and the pin at each select point to change the effective arm length. As a result of further research and development focusing on the idea of the concept, the select return force changes according to the select position to improve the usability in operation and prevent the shift efficiency from being reduced due to slip loss during shift. The present invention has been achieved to achieve the object.

[0006]

A shift mechanism of a manual transmission according to the present invention is connected to a shift lever, and a first shift fork is slidably supported and a first shaft that is movable and rotatable in an axial direction. A second shaft that is arranged in parallel with the first shaft and that slidably supports a second shift fork and is movable and rotatable in the axial direction; a first lever that is fixed to the first shaft; The first shaft is fixed to the two shafts.
The second lever engaged with the second lever and the second shaft fixed to the second shaft to select either one of the first and second shift forks, and the axial direction of the second shaft. A third lever that is interlocked with movement, a torsion spring having one end locked to one of the first shaft or the second shaft and having both legs, and the torsion spring fixed to the other of the first shaft or the second shaft. The lever is provided at different positions in the longitudinal direction of the lever, and includes a contact portion that abuts different portions in the longitudinal direction of both legs of the torsion spring according to the rotation of the lever.

[0007]

In the shift mechanism of the manual transmission of the present invention having the above-described structure, when the shift lever is selected, the first shaft rotates accordingly,
The second lever engaged with the first lever fixed to the first shaft rotates around the second shaft, and at this time, one end is locked to one of the first shaft and the second shaft. Both legs of the torsion spring and abutting portions arranged at different positions in the longitudinal direction of the lever fixed to the other of the first shaft or the second shaft selectively move according to the rotation of the lever. The select return forces are different because of the abutment, that is, because the effective arm length and load of the lever changes.

Further, in the shift mechanism of the manual transmission according to the present invention, since the first lever fixed to the first shaft and the second lever fixed to the second shaft are engaged with each other, the shift is performed. When the lever is shifted, the first lever and the second lever move in the axial direction in conjunction with each other, so that relative slip with the torsion spring does not occur.

[0009]

According to the shift mechanism of the manual transmission of the present invention having the above-mentioned operation, the plurality of contact portions selectively contact the both legs of the torsion spring according to the rotation of the lever, that is, Since the effective arm length and moment of the lever are changed, the select return force is also changed, which has the effect of improving the usability in operation.

Further, in the shift mechanism of the present invention, at the time of shifting, the first lever and the second lever are interlocked with each other to move in the axial direction and there is no relative movement. Therefore, relative sliding with the torsion spring is performed. Since this does not occur, it is possible to prevent the shift efficiency from being lowered due to the slip loss.

[0011]

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

(First Embodiment) The shift mechanism of the manual transmission of the first embodiment is connected to a shift lever (not shown) as shown in FIGS.
The first shift fork 11 is slidably supported and is axially movable and rotatable, and the first shaft 1 is disposed in parallel with the first shaft 1, and the second shift fork 21 is slidably supported. A second shaft 2 which is axially movable and rotatable, a first lever 3 fixed to the first shaft 1, a second lever 2 fixed to the second shaft 2, and a first opening of the first lever 3. A second lever 4 having a second open end 41 connected to the end 31 by a ball joint 43, and a coil portion 51 forming one end of the second shaft 2 are inserted, and the coil portion is also provided. A torsion spring 5 having upper and lower legs 52 and 53 which are connected to 51 and whose tips are selectively locked to the first shaft 1, and a longitudinal direction of one side wall of the first lever 3. Two pins 6 arranged at different positions of
1, 62 and the pins 61, 6 in the longitudinal direction of the other side wall
And a contact portion 6 composed of one pin 63 disposed at a position between the two.

As shown in FIG. 5, the first shaft 1 is formed with a connecting portion to the shift lever at the right end, is axially supported by a bearing 101 near the right end of the transmission case 10, and is inside the recess 102 at the left end. And is supported so as to be movable and rotatable in the axial direction.

As shown in FIG. 5, the second shaft 2 has recessed portions 103 and 104 of the mission case 10 at both ends.
And two shift forks 21 that are rotatably supported and axially movable.
1, 213 and a third lever 212 are provided.

As shown in FIGS. 1 to 5, the first lever 3 has a base portion 30 fixed to the left end side of the first shaft 1.
An arm portion 32 that is continuous with the base portion 30 and a recess 33 that forms a spherical joint 43 into which the spherical protrusion 42 of the open end 41 of the second lever 4 that is continuous with the arm portion 32 is fitted. And an open end 31 having a substantially Y-shaped vertical cross section.

The second lever 4 has a base portion 40 fixed to the left end side of the second shaft 2 as shown in FIGS.
And an open end 41 formed of a spherical projection 42 that is continuous with the base 40 and that forms a ball joint 43 that is fitted into the recess 33 of the open end 31 of the first lever 3.

As shown in FIGS. 1 to 5, the torsion spring 5 has a coil portion 51 at one end between the base portion 40 of the second lever 4 and the left end of the second shaft 2 and the second shaft 2. And the linear upper and lower leg portions 52 and 53 extend to the first shaft 1, and the tips sandwich the first shaft 1.

As shown in FIG. 1, the abutting portion 6 has the first radius of Ra, Rb, and Rc from the axis of the first shaft 1, respectively.
The leg portions 52, 5 are attached to the tip end portion arranged at the position on the lever 3 of
3 is formed by pins 61, 63 and 62 in which grooves for engagement with 3 are formed. FIG. 1 shows the contact state between the torsion spring 5 and each pin at the neutral select point shown in FIG. 52 and the tips of the lower leg portions 53 are in contact with the first shaft 1 in a neutral state.

FIG. 2 shows the contact state between the torsion spring 5 and each pin at the point A, which is the select point when shifting to the fifth speed gear shown in FIG. 6, and the tip of the upper leg 52 is the first end. The lower leg portion 53 comes into contact with the shaft 1 and the lower leg portion 53 is connected to the pin 63.
Is in contact with. The magnitude of the rotational torque against the torsion spring on the first shaft 1 at this time corresponds to (a) in FIG. 7.

FIG. 4 shows the contact state between the torsion spring 5 and each pin at the point B which is the select point when shifting to the first speed gear and the second speed gear shown in FIG. It abuts on the pin 61, and the tip of the lower leg portion 53 abuts on the first shaft 1. The magnitude of the rotating torque against the torsion spring on the first shaft 1 at this time corresponds to (b) of FIG. 7.

FIG. 3 shows a state in which the torsion spring 5 at the point C, which is the select point when shifting to the reverse gear shown in FIG. ing. The magnitude of the rotating torque against the torsion spring on the first shaft 1 at this time is shown in FIG.
It corresponds to (c) of.

The magnitude relation among the rotational torques (a), (b) and (c) is (b) <(a) <(c). Because first
The magnitude of the rotating torque on the shaft 1 depends on the pins 61, 62, 63.
This is because it is inversely proportional to the distance between the shaft center of the shaft 2 and the distance between the pins 61, 62 and 63 and the shaft center of the shaft 1, and is proportional to the rotational deflection angle of the legs 52 and 53 of the torsion spring.

In the shift mechanism of the manual transmission of the first embodiment having the above structure, when the shift lever is operated to select one of the select points,
The first shaft 1 rotates, and accordingly, the second shaft 2 connected to the first shaft 1 by a ball joint rotates in conjunction therewith.

For example, when the neutral select point, which is the select point when shifting to the third speed gear and the fourth speed gear shown in FIG. 6, is selected, the first shaft 1 and the second shaft 2 rotate, and Since the first lever 3 and the second lever 4 have an angular relationship as shown in FIG. 1 and the rotational deflection angle of the torsion spring is 0 °, no select force is generated.

When the shift lever is operated, as shown in FIG.
When point B, which is the selection point when shifting to the high speed gear or the second speed gear, is selected, the first shaft 1 and the second shaft 2 rotate to rotate the first lever 3 and the second lever. 4 has an angular relationship as shown in FIG. 4, which enables shifting to the first speed gear and the second speed gear, and the torsion spring 5 and the pin come into contact with each other as shown in FIG. The portion 52 comes into contact with the pin 61, the tip of the lower leg portion 53 comes into contact with the first shaft 1, and the select return force becomes larger than that in the neutral state as shown in FIG. 7.

When the shift lever is operated, 5 shown in FIG.
When the point A, which is the selection point when shifting to the high speed gear, is selected, the first shaft 1 and the second shaft 2 rotate and the first lever 3 and the second lever 4 move to the position shown in FIG.
The angle relationship shown in Fig. 2 is established, the gear can be shifted to the fifth speed gear, the torsion spring 5 and the pin are brought into contact with each other as shown in Fig. 2, and the tip of the upper leg portion 52 is connected to the first shaft 1. , The lower leg portion 53 comes into contact with the pin 63, and the select return force increases as shown in FIG.

When the shift lever is operated to select the point C which is the selection point when shifting to the reverse gear shown in FIG. 6, the first shaft 1 and the second shaft 2 rotate and the first shaft 1 rotates. 3 and the second lever 4 have an angular relationship as shown in FIG. 3 to enable shifting to the reverse gear, and the torsion spring 5 and the pin are in the contact state shown in FIG. Leg portion 52 abuts on the pin 62, and the lower leg portion 53 abuts on the first shaft 1, so that the select return force is maximized as shown in FIG.

The shift mechanism of the manual transmission of the first shaft 1 having the above-described operation has the pins 61 to 63 and the first shaft 1 having different effective radii depending on which of neutral and points A to C is selected. By selectively switching the contact relationship between the upper leg portion 52 and the lower leg portion 53 of the torsion spring 5, that is, the contact point and the effective radius, different select points are selected at each select point as shown in FIG. In addition to the effect of generating a return force, the driver is more convenient to operate.

In the shift mechanism of the first embodiment, when the shift lever is operated to select one of the select points, the first shaft 1 rotates, and accordingly, the ball joint is attached to the first shaft 1. When the second shaft 2 connected by 43 rotates in conjunction, and in that state the shift lever is shifted to one of the gears, the first shaft 1
Moves in the axial direction, and accordingly, the second shaft 2 connected to the first shaft 1 by the ball joint 43 also moves in the axial direction in association with the first shaft 1. Since there is no relative movement or slippage between the shaft 1 and the pins 61 to 63 arranged on the first lever 3 as in the conventional device, it is possible to prevent the shift efficiency from being lowered due to slip loss. Play.

Furthermore, in the shift mechanism of the first embodiment, the coil portion 51 of the torsion spring 5 is connected to the second shaft 2.
Since it is inserted in the first shaft 1, the torsion is inserted in the second shaft 2 via the coils 61 and the pins 61 to 63 arranged in the first lever 3 fixed to the first shaft 1. Legs 52 and 5 above and below the spring 5
The effect that the selective contact with 3 is realized.

Further, in the shift mechanism of the first embodiment, both the leg portions 52 and 53 of the torsion spring 5 are set to a length such that they can contact the first shaft 1, and one of the first lever 3 and With a very simple configuration in which the positional relationship of the three pins arranged on the other side wall is determined in consideration of the effective radius, it is possible to obtain different select return forces according to the select points. .

Further, in the shift mechanism of the first embodiment, by changing the position and effective radius of the pin arranged on the first lever 3, the select return force can be provided without changing the torsion spring 5. In addition to the effect that it can be easily changed, the effect that the select return force can be changed as a whole by changing the torsion spring 5 to one having a different spring constant.

Further, the shift mechanism of the first embodiment can easily cope with shift patterns other than the shift pattern shown as an example in FIG. 6 only by changing the arrangement positions of the pins 61 to 63. There is an effect that can be.

Further, in the shift mechanism of the first embodiment, the pins 61, 63, 62 are formed with grooves for engaging with the upper and lower legs 52, 53 of the torsion spring 5 at the tips thereof. Even if the shift is performed at a certain select point, the upper and lower leg portions 52 and 53 are engaged with the engaging grooves of the pins, and therefore, there is an effect that they will not come off.

The embodiments described above are merely examples for the purpose of explanation, and the present invention is not limited to them. Those skilled in the art will recognize from the claims, the detailed description of the invention and the description of the drawings. Modifications and additions can be made without departing from the technical idea of the present invention.

The above-described first embodiment has been described with respect to an example in which the coil portion of the torsion spring 5 is inserted on the second shaft, but the present invention is not limited to this. For example, the coil portion of the torsion spring is Insert it on the shaft, the second
A mode in which each pin is arranged on the second lever 4 fixed to the shaft 2 can also be adopted.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a neutral state in a first embodiment of the present invention, that is, a state at a time of selecting a third speed gear and a fourth speed gear.

FIG. 2 is an explanatory diagram showing a state at the time of fifth speed gear selection in the first embodiment.

FIG. 3 is an explanatory diagram showing a state at the time of reverse gear selection in the first embodiment.

FIG. 4 is an explanatory diagram showing a state at the time of selecting a first speed gear and a second speed gear in the first embodiment.

FIG. 5 is a partially cutaway plan view showing the device of the first embodiment.

FIG. 6 is an explanatory diagram illustrating a shift pattern according to the first embodiment.

FIG. 7 is a diagram showing a select return force at each select point in the first embodiment.

FIG. 8 is a cross-sectional view showing a conventional device.

FIG. 9 is an explanatory diagram illustrating an operating state of a conventional device.

[Explanation of symbols]

 1 1st shaft 2 2nd shaft 3 1st lever 4 2nd lever 5 Torsion spring 6 Contact part 11 1st shift fork 21 2nd shift fork 31 1st open end 41 2nd open end 43 Ball joint 51 Coil portion 52 Upper leg portion 53 Lower leg portion 61, 62, 63 pin 212 Third lever

Claims (5)

[Claims] 1. A first shaft that is connected to a shift lever, is slidably supported by a first shift fork, and is axially movable and rotatable, and a second shaft that is provided in parallel with the first shaft. A fork slidably supported and axially movable and rotatable, a second shaft, a first lever fixed to the first shaft, and a second shaft fixed to and engaged with the first lever. The second lever is rotated and the second shaft fixed to the second shaft is rotated to select one of the first and second shift forks, thereby selecting the second shift fork.
A third lever which is interlocked with the axial movement of the shaft; a torsion spring having one end locked to one of the first shaft or the second shaft and having both leg portions; and the other of the first shaft or the second shaft. And a contact portion that is disposed at different positions in the longitudinal direction of the fixed lever and that abuts different positions in the longitudinal direction of both legs of the torsion spring according to the rotation of the lever. Manual transmission shift mechanism. 2. The shift mechanism for a manual transmission according to claim 1, wherein a coil portion forming one end of the torsion spring is inserted in the second shaft. 3. The first lever according to claim 2, wherein the abutment portion is provided with two pins on one side wall and one pin on the other side wall. Shift mechanism of manual transmission characterized by. 4. The shift of a manual transmission according to claim 3, wherein the tip ends of the leg portions connected to the coil portion of the torsion spring are selectively locked to the first shaft. mechanism. 5. The shift mechanism for a manual transmission according to claim 4, wherein the open ends of the first lever and the second lever are connected by a ball joint.