JPH0544615Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a transmission that has a plurality of forward gears and a reverse gear, and particularly relates to a transmission in which a sliding lever presses a shift rail. .

(Prior Art) As a transmission gear change operation means, shift rails each extending from a plurality of shift rails and a sliding lever for selectively pressing and moving these plurality of shift rails are used. What it has is known. for example,
As shown in Fig. 5, in the case of a transmission with five forward speeds and one reverse speed, there are three shift rails 1,
2 and 3, these are for reverse/1st speed and 2
The shift rails 4, 5, and 6 for 3rd speed, 4th, and 5th speed are extended. These are arranged in parallel in the select direction The shift arm 8 of the riding lever is formed to be selectively moved.

By the way, in order to prevent this sliding lever from erroneously operating towards the reverse/1st gear side,
It is formed to require a larger operating force than the operating force required to move to the 4th and 5th speeds. That is, a pair of springs (not shown) are provided that are compressed when the sliding lever moves in the selection direction X, thereby also regulating the neutral position.

(Problems to be Solved by the Invention) The plurality of shift rails 4, 5, and 6, which are the gear change operation means of the transmission, are formed with uniform widths in the selection direction X and with uniform gap widths, As a result, the amount of movement in the selection direction from the neutral position (the position indicated by the solid line in FIG. 5) is made equal. However, even though the amount of movement in the select direction is made equal, the operator feels that the amount of selection movement toward reverse/first gear is smaller than the amount of selection movement toward 4th/5th gear. The problem is that it feels like there are fewer people.

In other words, when moving to reverse/1st gear side,
Compared to this operation of moving in the opposite direction, it seems that the amount of movement feels smaller as a result of requiring a larger spring compression force. Moreover, as shown in Figure 4, there is a tendency for the backlash a near the neutral position 0 to be considered to be within the speed range of the springs on the 4th and 5th gear side, where the spring constant is smaller, and point A is considered to be the neutral position. This may be due to a misunderstanding.

An object of the present invention is to provide a transmission equipped with a reverse stage that allows the amount of movement toward the select position to be intuitively felt to be an appropriate amount.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a structure in which a pair of locking surfaces are continuous in the select direction on each of a plurality of shift rail jaws arranged in parallel in the case. stop walls are formed on the shift rail jaws at both ends in the selection direction to restrict movement of the shift arm of the sliding lever in the selection direction, and apply a pressing force to both sides of the shift arm. Of the pair of springs arranged in such a manner, the spring constant of the spring on the other side provided with the reverse stage is set to be larger than that of the spring on one side in the select direction, so that the shift arm is moved from the neutral position to the elastic force of the spring. The gear shifting operation is performed by moving in the select direction against the above-mentioned plurality of shift rails, selectively opposing one of the locking surfaces of the plurality of shift rail jaws, and pressing the same surface. In the transmission, the stop wall of the shift rail jaw at the other end equipped with a reverse stage is farther away from the neutral position by a predetermined distance than the stop wall of the shift rail jaw at one end in the selection direction. It is characterized by being formed.

(Function) The spring constant of the spring on the other side equipped with a reverse stage is set larger than that of the spring on one side in the select direction, and in particular, the spring on the other side equipped with a reverse stage is set higher than the stop wall of the shift rail jaw at the end of the one side in the select direction. The stop walls of the shift rails at the side ends are formed a predetermined distance from the neutral position, so during gear shifting operations, the shift arm is moved from the neutral position to the other end rather than from the neutral position. Intuitively, it feels like the amount of operation is less because the spring constant of the spring on the other side is larger, but here, the shift arm is moved relatively largely toward the stop wall at the other end. Therefore, intuitively, the amount of selection operation in both directions feels the same.

(Example) The transmission in Figure 1 has 5 forward speeds and 1 reverse speed.
It changes gears, and its gear shifting operation means include three shift rails 10, 11, 12, and shift rails 13, 1 integrated with each shift rail.
4, 15, and a sliding lever 16 for switching and moving these shift rails.
Prepare at the top of 7.

Each of the shift rails 10, 11, and 12 is supported within a case 17 so as to be slidable in the shift direction Y, which is the longitudinal direction thereof, and the selector rails are mounted on the upper part of the case 17 as shown in FIG. A torsion shaft 19 that is long in the selection direction X is supported within the lever case 18.

The shift rails 13, 14, 15 fixed to each shift rail 10, 11, 12 have locking surfaces 131, 14 facing the respective shift direction Y.
1 and 151 are formed in pairs with a predetermined distance apart, and these are arranged in parallel in the selection direction X with a predetermined gap t in between.

Among these, the shift rail jaws 13 and 15 have stop walls 13 that are perpendicular to each of the locking surfaces 131 and 151.
2,152 are formed respectively. In particular, the stop wall 152 for the reverse speed and first speed is formed at a position 1 mm farther away from the neutral position shown by the solid line in FIG. 1 than the stop wall 132 for the fourth and fifth speed.

A shift arm 161 of the sliding lever 16 is housed in a space that is long in the selection direction X and surrounded by the three pairs of locking surfaces 131, 141, and 151 so as to be able to perform a selection operation.

The sliding lever 16 extending the shift arm 161 is spring-coupled to the torsion shaft 19 as shown in FIG. 2, and is slid in the select direction X by a select lever (not shown). It is swung in the rotational direction which is the shift direction Y.

As shown in FIG. 2, a pair of springs 2 with different spring constants are installed on both sides of the sliding lever 16.
1 and 22 are provided oppositely. These springs exhibit spring characteristics as shown in FIG.

That is, the spring 21 for reverse/1st speed is 4/5
Its spring constant is set larger than that of the spring 22 for speed.

It is assumed that an operator operates such a transmission to change gears. For example, when shifting to reverse gear, the shift arm 161 of a sliding lever that is linked to a change lever (not shown) comes into contact with the spring wall 152 of the shift rail 15 from the neutral position (the position shown by the solid line in FIG. 2). Select and move to the position. At this time, as shown in FIG. 3, the amount of movement L on the torsion shaft 19 is
The sliding lever 16 that slides by 1 is subjected to a pressing force F1 by the operator in order to deform the spring 21 by a compression amount that is approximately equal to the movement amount L1. Following this, the shift arm 161 moves in the shift direction Y.
The lever swings to press the locking surface 151, slide the shift rail 15, that is, the shift rail 12, and engage the reverse gear train (not shown).

Next, it is assumed that the gear is shifted from the third gear to the fourth gear. In this case, the shift arm 161 swings once to the neutral position, and then moves by a selected amount of movement L2 until it comes into contact with the stop wall 132, and then,
The locking surface 131 is pressed in the shift direction to achieve switching between four speeds.

During this selection operation, the operator applies a pressing force F2 to the shift rail yaw 15 to deform the spring 22 by an amount of compression approximately equal to the amount of movement L2.

In this way, the pressing force F1 during the select operation for reverse gear shifting is larger than the pressing force F2 for fourth gear shifting, but the select movement amount L1 at that time is
is 1 mm larger than the amount of movement L2 for shifting to 4th gear, and the respective amounts of movement from the neutral position to the reverse gear side and the 4th gear side are intuitively felt to be equal. In other words, the operator feels that the selection switching movement amount is an appropriate amount. Furthermore, by applying a sufficiently large pressing force F1 when switching to the reverse side, it is possible to bring out the effect of calling attention to the fact that the shift is in the reverse/first gear direction.

Although a transmission with five forward speeds and one reverse speed has been described above, the present invention can be applied to transmissions with other speed change patterns including reverse speeds.

(Effect of the invention) The amount of selection movement from the neutral position to the other end with the reverse stage is set larger, and the amount of each selection movement between the other end, which is the reverse stage side, and the opposite end is intuitive. There is an advantage that the selection amount on the reverse stage side is felt to be equal, that is, the selection amount on the reverse stage side is an appropriate amount.

[Brief explanation of the drawing]

Fig. 1 is a plan sectional view of the main part of a transmission as an embodiment of the present invention, Fig. 2 is a side sectional view of the main part of the same transmission, and Fig. 3 is the characteristics of the spring in the same transmission. FIG. 4 shows a spring characteristic diagram of the conventional device, and FIG. 5 shows a plane sectional view of the main part of the conventional device. 13, 14, 15...Shift rail 1
6...Sliding lever, 161...Shift arm, ,22
...Spring.

Claims (1)

[Scope of utility model registration request] A pair of locking surfaces are formed continuously in the selection direction on each of the plurality of shift rails arranged in parallel in the case, and the shift rails at both ends in the selection direction are provided with a sliding lever for shifting. A stop wall is formed to restrict the movement of the arm in the select direction, and among a pair of springs arranged to apply a pressing force to both sides of the shift arm, one spring in the select direction is used to move the shift arm toward the reverse stage. The spring constant of the spring on the other side is set to be large, and the shift arm moves from the neutral position in the select direction against the elastic force of the spring to move one of the plurality of shift rails. In a transmission in which a gear change operation is performed by selectively opposing a locking surface and moving the same surface by pressing the same surface, reverse movement is performed from the stop wall of the shift rail jaw at one end in the select direction. A transmission characterized in that a stop wall of the shift rail at the other end provided with a step is formed to be separated from the neutral position by a predetermined amount.