JPS6140986Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operating mechanism disposed between a striking rod and a shift fork of a manual transmission.

A manual transmission installed in a vehicle such as an automobile has a plurality of forward positions and one reverse position. In general, the manual transmission has a forward speed change gear train of a constant mesh type, and a reverse speed change gear train of a selective mesh type. Therefore, when shifting the transmission into reverse gear, the gear shift is performed by displacing the reverse gear in the axial direction from a neutral position where direct power transmission is not possible and bringing it to a shift position where power transmission is possible. For this reason, if a load is applied to the reverse gear in the direction of out-of-gear (direction toward the neutral position) during power transmission in the reverse state with the reverse gear in the shift position, this load will be directly applied to the shift operation system. The reverse gear sometimes returns to the neutral position against the shift check force provided therein, resulting in so-called reverse gear slippage.

Therefore, in the past, as known in Automotive Science Complete Book Volume 9: Power Transmission and Transfer (published by Sankai Gaku, November 1981), the above shift check force was increased, or the meshing state of the reverse gear was adjusted by applying a load in the direction of gear disengagement. Countermeasures have been taken, such as adjusting the gear so that it is less likely to act on the gear, and making the teeth of the reverse gear inversely tapered so that the load in the direction of gear disengagement is no longer applied. However, with the first measure, the force required to change gears increases due to the increase in shift check force, which deteriorates operability, and with the second measure, strict dimensional accuracy of the reverse gear is required, which is troublesome to manage. The manufacturing cost of the gear will increase, and the third measure will increase the gear noise, causing noise generation, and the tooth contact will be unstable and the surface pressure will increase, resulting in poor durability. It was also impractical.

In view of the conventional situation, the present invention has been developed in such a way that one of the forward position is located opposite to the reverse position.
A reverse shift fork is linked to two shifters, and the reverse shift fork is operated via the shifter when shifting to the reverse position, and the reverse shift fork is engaged with the housing when the reverse position is engaged. When the shifter in the forward position opposite to the reverse position is in the neutral position, the shift fork for reverse is prevented from moving in the shift direction to prevent gear squeal caused by the reverse gear. An object of the present invention is to provide an operating mechanism for a manual transmission that prevents the above.

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

That is, FIGS. 1 to 4 show an operating mechanism A of a manual transmission showing an embodiment of the present invention.
The striking rod 1 is operated by a control lever (not shown), the striking lever 2 is fixed to the striking rod 1, and
1 selectively engaged with this striking lever 2
- It is equipped with shift levers for forward positions such as a shifter 3 for 2-speed, a shifter 4 for 3-4, and a shifter 5 for 5-speed, and a reverse position is arranged opposite to the 5-speed position, which is one of the forward positions. There is. 6 is a reverse shift fork. The striking rod 1 is rotatably and slidably supported within the housing 7, and is rotated around an axis when the driver performs a selection operation,
When performing a shift operation, it is moved in the axial direction.
Further, the shifters 3, 4, 5 and the reverse shift fork 6 are each made into a bell crank lever rotatably attached to the housing 7 via a bracket 9 by a common pivot pin 8, and the shifters 3, 4, 5
The tip 2a of the striking lever 2 is attached to one end of each
Grooves 3a, 4a, and 5a are formed into which the particles enter. In addition, one end 6a of the reverse shift fork 6,
It is interposed between the corresponding end of shifter 5 and a fixed wall 9a provided by bracket 9. An interlock plate 20 is fitted into the grooves 3a, 4a, 5a of the shifters 3, 4, 5, and the interlock plate 20 locks the shifters other than the one shifter where the striking lever 2 is located. It is designed to prevent stopped shifters from moving.

The other ends of the shifters 3, 4, 5 are connected to the grooves 10a, 1 of the corresponding forecloths 10, 11, 12, respectively.
1a and 12a, and the other end 6b of the reverse shift fork 6 is bifurcated to straddle the reverse gear 13. The reverse gear 13 is slidable on a shaft 14 horizontally mounted on the housing 7.
In the neutral position shown by the solid line in the figure, power transmission is disabled, and at the shift position shown by the two-dot chain line, power transmission is possible in the reverse position.

The 5-speed shifter 5, the reverse shift fork 6, and the bracket 9 each have the side shapes shown in FIGS. A reverse gear slippage prevention means B including movers 15 and 16 is provided. That is, the shifter 5 has an arcuate groove 5b centered on the pin 8 arranged on a surface overlapping with one end 6a of the reverse shift fork 6, and the one end 6a of the reverse shift fork 6 has two through holes 6c. , 6d, and a recess 9b is formed in the fixed wall 9a. These arcuate grooves 5b, through holes 6c, 6d, and depressions 9b are arranged so that they are in the relative positions shown in FIGS. 1 and 3 a in the neutral state of the transmission, respectively, and moved into the through holes 6c, 6d, respectively. The members 15 and 16 are slidably fitted. Note that the arcuate groove 5b and the depression 9b have the same depth, and the lengths of the movers 15 and 16 are determined by adding the thickness of the shift fork end 6a to this depth.

The bracket 9 is further provided with a stopper 9c projecting from the fixed wall 9a, so that the reverse shift fork 6 can be moved from the position shown in FIGS. 1 and 3 a to the first position.
Prevents rotation in the clockwise direction in the figure.

Furthermore, in this embodiment, as shown in FIG. 4, the outer diameter end of the interlock plate 20 on the right side in the figure is extended in an arc shape centered on the striking rod 1. The portion is designated as a blocking portion 21. That is, when the striking lever 2 engages with a shifter 3 or 4 other than the 5-speed shifter 5 facing the reverse position, the blocking portion 21 engages the groove 6e formed in the one end 6a of the reverse shift fork 6. They are fitted to prevent movement of the reverse shift fork 6.

With the above configuration, the functions of the operating mechanism of the manual transmission according to this embodiment will be described below.

In the neutral state of the transmission shown in FIG. 1 and FIG.
In this state, when the striking lever 2 is moved to the right in FIG. 1 through the striking rod 1 by a shift operation, the groove 3a is displaced in the direction a in FIG. 1st
The fork rod 10 is rotated counterclockwise in the figure, and as a result, the fork rod 10 is lowered in the figure, and the transmission is moved to the first position.
You can choose the speed. In the same state, when the striking lever 2 is moved to the left in FIG. 1 by a shift operation in the opposite direction, the groove 3a is displaced in the direction a in FIG. 3, and the shifter 3 is rotated clockwise in FIG. As a result, the fork rod 10 rises in the figure, allowing the transmission to select the second speed.

Next, when the striking rod 1 is shifted to the right in FIG. 1 by a shift operation in the neutral state of the transmission shown in FIG. 1 and FIG. 3a, the groove 4a of the 3-4 speed shifter 4 engaged with the striking lever tip 2a is displaced in the direction shown in FIG. 3a, and the shifter 4 is rotated counterclockwise in FIG. 1, whereby the fork rod 11 (see FIG. 2) is rotated to the 1st
In the same neutral state, when the striking rod 1 and the striking lever 2 are shifted to the left in FIG. 1 by the shift operation in the reverse direction,
The groove 4a is displaced in the direction shown in FIG. 3a, and the shifter 4 is rotated in the clockwise direction shown in FIG. 1, whereby the fork rod 11 rises in FIG. 1, and the transmission can select the fourth speed.

Further, the rotation of the striking rod 1 by the select operation rotates the striking lever 2 so that its tip 2a engages with the groove 5a of the shifter 5 for 5-speed gears, and in this state, the striking rod 1 and the striking lever are rotated by the shift operation. 2 to the right in FIG. 1, the groove 5a is displaced in the direction a in FIG. 3 and reaches the position shown in FIG. As a result, the fork rod 12 (see FIG. 2) is lowered in the same figure, allowing the transmission to select the fifth speed. By the way, during such a shift operation, that is, during the rotation of the five-speed shifter 5 in which the groove 5a reaches the position shown in FIG. 3A from the position shown in FIG. 3B, the mover 15
is indented into the recess 9b to lock the end 6a of the action member 6 to the fixed wall 9a, and to restrain the reverse shift fork 6 in the rotational position where it collides with the stopper 9c. shifter 5
The reverse gear 13 does not move from the neutral position shown by the solid line in FIG. Further, the end of the mover 16 far from the fixed wall 9a is inserted into the groove 5b, and since this groove 5b has a length corresponding to the rotation stroke of the shifter 5, the end of the mover 16 is inserted into the groove 5b. The above-mentioned rotation of the shifter 5 is not hindered, and the transmission can be shifted to the fifth speed by the above-mentioned action.

On the other hand, when the striking rod 1 and the striking lever 2 are moved to the left in FIG. 1 by shifting in the opposite direction in the same selected state, the groove 5a is displaced in the middle direction of FIG. By reaching this point, the shifter 5 is rotated clockwise in FIG. During this rotation, the end of the mover 16 protruding into the groove 5b as shown in FIG. The clamped reverse gear 13 can be axially displaced from a neutral position shown by a protruding line in FIG. 1 to a shift position shown by a phantom line in the same figure, and the transmission can select reverse.

At the beginning of this action, the mover 15 is immediately expelled from the recess 9b, but due to this expulsion, the end of the mover 15 that protrudes from the reverse shift fork 6 is received in the groove 5b as shown in Fig. 3c. Therefore, the mover 15 does not interfere with the above operation. When the transmission selects reverse at the end of the above action, the mover 16 is moved into the recess 9b as shown in FIG. 3c.
The moving member 15 can lock the operating member 6 to the fixed wall 9a because the shifter 5 maintains this recessed state as shown in FIG. 3c. . Therefore, even if a load in the direction of out-of-gear acts on the reverse gear 13 in the reverse selection state and is transmitted to the reverse shift fork 6 in the direction F in FIG. , the fixed wall 9 via the mover 16
a, that is, it is received on the housing 7 side. In this way, by providing the reverse gear slippage prevention mechanism B using the movers 15 and 16, it is possible to reliably prevent the occurrence of reverse gear slippage.

Furthermore, in the embodiment of the present invention, as shown in FIG.
Since this blocking portion 21 is provided, it is possible to prevent the reverse shift fork 6 from moving in the shift direction when the striking lever 2 selects a shifter 3 or 4 other than the 5-speed shifter 5. That is,
Mover 15 of the reverse gear slippage prevention mechanism B,
Both ends of 16 are each formed into a hemispherical shape,
In the state shown in FIG. 3a, that is, when the striking lever 2 is engaged with a shifter other than the 5-speed shifter 5 and the reverse shift fork 6 is in the neutral position, an arcuate groove 5b is located so that the mover 15 can be moved upward. Therefore, when the slider 15 moves slightly upward as shown in FIG. 8 due to vibrations when the vehicle is running, a gap is created between both ends of the slider 15 and the left end of the arcuate groove 5b and the recess 9b. δ
₁ and δ ₂ , and the reverse shift fork 6 moves in the shift direction (to the left in the figure) due to the gaps δ ₁ and δ ₂ , which may cause gear squeal by the reverse gear 13. . However, in the present invention, since the blocking portion 21 is formed on the interlock plate 20 as described above, movement of the reverse shift fork 6 in the neutral state can be prevented and gear squeal can be reliably prevented. still,
FIG. 4a shows a case where the striking lever 2 is engaged with the groove 4a of the 3-4 shifter 4,
FIG. 4b shows a case where the striking lever 2 is engaged with the groove 3a of the 1-2 shifter 3,
In any of these cases, the blocking portion 21 is engaged with the groove 6e of the reverse shift fork 6. On the other hand, FIG. 4c shows a case where the striking lever 2 is engaged with the groove 5a of the 5-speed shifter 5, and in this case, the reverse shift fork 6 may be shifted by the shifter 5. Therefore, the blocking portion 21 separates from the groove 6e, allowing the reverse shift fork 6 to move.

By the way, in this embodiment, since the forward position opposite to the reverse position is the 5th speed position, the 5th speed shifter 5 is used to operate the reverse shift fork 6. When the reverse position is used opposite to another forward position, the reverse shift fork 6 is operated via the shifter of the opposite forward position, and the reverse gear is not disengaged between these shifters and the shift fork 6. Prevention means B will be provided.

As explained above, the present invention is a manual transmission in which a reverse position is arranged opposite to one of the forward positions, and between a striking lever and a shift fork for the forward position, there is a one is thus selected and a forward position shifter is arranged for actuating one of the forward shift forks by shifting movement of the striking lever;
In the operating mechanism, the shifter is provided with an interlock plate that prevents the movement of shifters other than the shifter selected by the selection movement of the striking lever. A reverse gear is provided between the shifter in the reverse position and a mover that operates the reverse shift fork via the shifter during a shift operation to the reverse position and is engaged with the housing side when engaged in the reverse position. Since the disengagement prevention means is provided, when the reverse position is engaged, the mover is engaged with the housing side to prevent the shift fork for reverse from moving, thereby reliably preventing the reverse gear from disengaging, and also as described above. It is possible to improve each of the problems in the prior art.
Furthermore, in the present invention, the interlock plate is provided so as to overlap one end of the reverse shift fork, and the striking lever selects a shifter other than the shifter that operates the reverse shift fork. In such a case, since a blocking portion is provided to prevent the reverse shift fork from moving in the shift direction, the reverse shift fork may shift due to the backlash of the reverse gear slippage prevention means due to vibrations such as when the vehicle is running. This is an excellent effect in that the movement in the direction is blocked by the blocking portion, and gear squeal caused by the reverse gear can be reliably prevented.

[Brief explanation of the drawing]

Fig. 1 is a main part configuration diagram showing an operating mechanism of a manual transmission according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a - line sectional view in Fig. 1. FIG. 4 corresponds to a cross section taken from the - line in FIG. 1, and FIG. 5 is a side view of the 5-speed shifter, FIG. 6 is a side view of the reverse shift fork, FIG. 7 is a vertical side view of the bracket, and FIG. 8 is a side view of the bracket in FIG. 3a. FIG. 3 is an enlarged view showing a state in which the mover has moved corresponding to the X portion. 1... Striking rod, 2... Striking lever, 5... 5-speed shifter, 6...
Reverse shift fork, 7...housing,
9... Bracket, 13... Reverse gear, 20
...Interlock plate, 21...Blocking part, A
...Operation mechanism, B...Reverse gear slippage prevention means.

Claims (1)

[Scope of utility model registration request] A manual transmission in which a reverse position is placed in a waiting position at one of the forward positions, one of which is selected by a selective movement of the striking lever between a striking lever and a shift fork for the forward position, and A forward position shifter is disposed that operates one of the shift forks by a shift movement of the striking lever, while the shifter has a shifter other than the shifter selected by the selection movement of the striking lever. In an operation mechanism that is provided with an interlock plate that prevents movement of the reverse shift fork and a shifter in a forward position opposite to the reverse position, when a shift operation to the reverse position is performed, the reverse a reverse gear slip-off prevention means having a mover that is engaged with the housing side when the reverse position is engaged, and the interlock plate is superimposed on one end of the reverse shift fork. The present invention is characterized by being provided with a blocking portion extending so as to prevent movement of the reverse shift fork in the shift direction when the striking lever selects a shifter other than the shifter that operates the reverse shift fork. Manual transmission operating mechanism.