JPH0526064B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a booster for operating a transmission that uses pressure fluid as a pressure source, which corresponds to a shift position for a gear change operation when the booster mechanism is activated. This invention relates to a moderation feeling improving mechanism that can give a feeling of moderation.

(Prior Art) A conventional technique is described in Japanese Utility Model Publication No. 54-13519. This device is called a detent mechanism for operating the transmission, and as shown in Figs. In addition to preventing vibrations from affecting the valve section 4 of the booster, a recess 5 for receiving the lock ball 1 is formed in the bolt section 6 fixed to the input rod 3 to maintain the input rod 3 in a neutral state. It was something I had become accustomed to.

(Problem to be Solved by the Invention) However, this conventional device simply applies a load to the input rod 3 in response to the phase shift between the input rod 3 and the output rod 7, regardless of the shift position of the shift lever 8. It functions to hold the input rod 3 in a neutral position with respect to the output rod 7, and no consideration has been given to improving the sense of moderation during operation in accordance with the shift position of the shift lever 8. Ta.

In other words, in the conventional booster using pressure fluid as described above, the shift force felt by the operator is as shown by the solid line a in Fig. 16, and since the booster is effective, the shift force felt by the operator is as shown by the solid line a in Fig. 16. The difference between the shift force and the shift force at the time of shifting is small, so that it is difficult for the operator to sense the neutral position.

This invention was made to eliminate the drawbacks of the conventional booster using pressure fluid as described above, and provides a mechanism that can provide a sense of moderation corresponding to the shift position during gear change operation. The purpose is to

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a booster for transmission operation using pressure fluid as a drive source, which is provided between a casing and an input rod or an output rod. It has a groove formed on the outer periphery of the rod or output rod, and a lock ball that is removably engaged with the groove by being biased by an elastic member, and the input rod or output rod is attached to the casing. a lock mechanism that allows the rod to slide relative to the casing while applying a load to the rod, a piston chamber connected to the pressure system of the booster, and a pressure inside the piston chamber. and a switching mechanism which has a piston that operates to bias the elastic member toward the input rod or output rod side, and turns the lock mechanism on and off in conjunction with the on and off of the pressure system. It is characterized by the fact that

(Function) In the above invention, when the input rod or the output rod is in the neutral position, the lock mechanism holds the rod in the neutral position, and this lock mechanism allows the input rod or the output rod to be held against the casing during a shift operation. To improve the sense of moderation that an operator receives from a shift lever by applying a load when sliding.

Further, when the booster is in an off state due to the engine being stopped, the switching mechanism works in conjunction with the booster to release the lock mechanism, thereby facilitating a shift operation when the engine is stopped.

In an embodiment of the invention, the locking mechanism is
The lock ball is biased by an elastic member and engages with a groove formed in the input rod or output rod, thereby holding the rod in a neutral position with respect to the casing.During a shift operation, the lock ball is biased by the elastic member and By rolling on the rod, a load is applied to the rod.

In addition, the switching mechanism is such that when the booster is in operation, pressure is introduced into the piston chamber from the pressure system of the booster, and the piston engages with the elastic member to generate an initial load on the elastic member. Then, when the lock mechanism is activated and the booster is inactive, no pressure is introduced into the piston chamber, and the elastic member becomes free, releasing the lock mechanism.

(Example) The present invention will be explained in more detail below based on the example shown in the drawings.

FIG. 1 shows an embodiment in which a moderation feeling improving mechanism 50 according to the present invention is installed in a booster which is new in itself, and shows a cylinder 11 constituted by a piston cylinder 11A and a cylinder body 11B.
A piston rod 12 is fitted into the slide itself in the axial direction, and an annular piston 13 is attached to the outer periphery of the piston rod 12 on the right end side in the figure.
It is fitted so that it cannot move in the axial direction. The piston 13 separates the space between the inner circumferential surface of the piston cylinder 11A and the outer circumferential surface of the piston rod 12 on both sides, and the right piston chamber 1
4 and a left piston chamber 15 are formed. Also, the cylinder body 11B has a piston rod 12.
A cylindrical inner 16 is press-fitted between the two.

Inside the piston rod 12 is a valve cylinder 17.
C and collars 17A, 17 fixed to both ends thereof
A center valve rod 17 constituted by B is fixed in a non-slidable and non-rotatable manner, and a spool rod 1 is disposed in the center valve rod 17.
8 is fitted and inserted so as to be slidable in the axial direction. A right reaction force chamber 19 and a left reaction force chamber 20 are formed between the spool rod 18 and the collars 17A, 17B so as to be located at both ends of the spool rod 18, respectively. A pair of springs 21 and 22 are interposed between the center valve rod 17 and the spool rod 18 in the right reaction force chamber 19 and the left reaction force chamber 20, so as to keep the spool rod 18 at a neutral position with respect to the center valve rod 17. keeping.

An input rod 23, which is fitted into the piston rod 12 so as to be movable in the axial direction, is integrally screwed to the left end of the spool rod 18 in the drawing.The spool rod 18 and the input rod 23 constitute an input rod. A bolt 24 is fixed to the input rod 23 by a nut 25 perpendicular to the axial direction. Both ends of this bolt 24 are connected to the piston rod 12, respectively.
When the spool rod 18 is in a neutral state, it is located at the center of the bolt 24 opening 26 and is in contact with the front and rear inner walls of the opening 26. A predetermined clearance is maintained between each.

Further to the left side of the opening 26 of the piston rod 12 in the figure, there is provided a moderation feeling improving mechanism 50 as shown enlarged in FIGS. 2 and 3.

This moderation feeling improvement mechanism 50 is connected to the piston rod 12.
A lock ball groove 51 is formed on the outer periphery of the cylinder 11, and a lock ball hole 53 is formed in a housing 52 integrally formed with the cylinder 11 so as to face the position of the lock ball groove 51 in the neutral state. Furthermore, a cylinder hole 54 is formed in the upper part of this lock ball hole 53, into which a piston 55 is fitted so as to be vertically movable.

The upper end of the piston hole 53 is sealed by a plug 56 to form a piston chamber 57, and this piston chamber 57 is communicated with the pressure fluid inlet 11a formed in the cylinder 11 through a communication hole 58. There is.

A lock ball 59 is inserted into the lock ball hole 53, and is biased by a spring 60 interposed between the lock ball hole 53 and the piston 55 in the direction of engagement with the lock ball groove 51 of the piston rod 12. When the spool rod 18 and the piston rod 12 are in the neutral position, the lock ball 59 engages with the lock ball groove 51 to lock the piston rod 12.

Next, the structure of the pressure system of the booster will be explained based on FIGS. 4 to 6. FIG. 6 is a diagram schematically showing the flow path of pressure fluid, and FIG. The cross section taken along line B is shown in Figure 5 as shown in Figure 6.
- A cross section taken along the C line is shown.

In the drawing, the cylinder body 11B has a pressure fluid inlet 11a (FIG. 5) and a pressure fluid outlet 1.
1b (Fig. 4) is formed, and the inner
6 has three communication grooves 16 extending in the axial direction, the arrangement of which is shown in FIG.
a, 16b, 16c are formed, and the communication groove 1
6a communicates with the pressure fluid inlet 11a, and the communication groove 16b communicates with the pressure fluid outlet 11b. In addition, the piston rod 12 has each communication groove 16 of the inner 16.
Three through holes 12a, 12b, 12c are formed at positions opposite to a, 16b, 16c, and communicate with the communication grooves 16a, 16b, 16c, respectively.

A communication groove 17b (FIG. 4) extending in the axial direction is formed in the outer peripheral portion of the center valve rod 17 at a position facing the through hole 12b of the piston rod 12, and communicates with the through hole 12b. This communication groove 17b has a pair of through holes 17 at both ends thereof.
d and 17e are opened to the inner circumferential surface of the center valve rod 17. Furthermore, a communication groove 17a (FIG. 5) having a predetermined width in the axial direction is formed in the outer circumference of the center valve rod 17 at a position facing the through hole 12a of the piston rod 12, and communicates with the through hole 12a. There is. The center valve rod 17 also has a through hole 1 that communicates with the through hole 12c of the piston rod 12 at a position opposite to the through hole 12c.
7g is formed. Furthermore, on the outer circumference of the center valve rod 17, a communication groove 17 extending in the axial direction is provided at a position on the left side of the through hole 17g in the figure.
h, and communicates with the left reaction force chamber 20 through a through hole 17i.

A through hole 1 is provided on the inner circumference of the center valve rod 17.
Two annular supply grooves 17j and 17k are formed in a portion sandwiched between 7d and 17e, and a through hole 17g is communicated with the supply groove 17j on the right side in the figure.
The supply groove 17k on the left side in the figure communicates with the communication groove 17h through a through hole 17l.

On the outer periphery of the spool rod 18, three annular supply grooves 18a, 18 are arranged alternately with the supply grooves 17j, 17k of the center valve rod 17.
b, 8c are formed, and the supply groove 1 on the right side of the figure is formed.
8a communicates with the through hole 17d, the supply groove 18c on the left side of the drawing, and the through hole 17e, respectively (FIG. 4). Further, the supply groove 18b in the center of the drawing communicates with the communication groove 17a of the center valve rod 17 through a through hole 17f (FIG. 5). A communication hole 18d extending along the axis is formed in the center of the spool rod 18, and its left end side in the drawing communicates with the supply groove 17k of the center valve rod 17 through a communication hole 18e.

At the right end of the piston rod 12 in the drawing, through holes 12d and 12e are formed so as to be located on both sides of the piston 13 and communicate with the right piston chamber 14 or the left piston chamber 15, respectively. Two annular supply grooves 17m and 17n are formed on the outer periphery of the center valve rod 17 at positions facing the through holes 12d and 12e of the piston rod 12, respectively, and communicate with the through holes 12d and 12e, respectively. . In addition, the supply groove 12e on the left side of the figure is the through hole 1.
7o communicates with the right reaction force chamber 19.

An annular supply groove 1 is provided on the inner circumference of the center valve rod 17 at a position facing the supply groove 17m on the right side of the figure.
7p is formed, and communicates with the supply groove 17m on the outer circumference through a through hole 17q, and communicates with a communication hole 18d through a through hole 18f formed in the spool rod 18.

Note that the communication groove 1 located on the lower side of the inner 16 in the figure
6c is always communicated with the left piston chamber 15.

As shown in FIG. 7, the booster 40 is attached to a transmission 41, and has an input rod 23 connected to a shift lever 43 via a shift link 42, and a pressure fluid inlet 1.
1a is connected to the pressure fluid outlet 11 via the pipe 44.
b is connected to a pressure fluid pump 46 via a pipe 45.

Here, first of all, operate the booster mentioned above.
The explanation will be given with reference to FIG. Here, FIGS. 9 and 11 are diagrams each schematically showing the connection state of each hole or groove in the operating position of the spool rod 18.

When the shift lever 43 is in the neutral state, the spool rod 18 and the input rod 23 are held in a neutral position as shown in FIGS. 4-6. As can be seen from FIGS. 5 and 6 in this intermediate state, the pressure fluid introduced from the pressure fluid inlet 11a flows through the communication groove 16a - through hole 12a - communication groove 17a - through hole 17f - supply groove 18b - supply groove. 17j - Through hole 17g - Through hole 12c - Communication groove 16c
It is introduced into the left piston chamber 15 through the path from the supply groove 18b to the supply groove 17k to the through hole 18e.
It is introduced into the right piston chamber 14 through the path of communication hole 18d - through hole 18f - supply groove 17p - through hole 17q - supply groove 17m - through hole 12d.

Further, the pressure fluid introduced into the left piston chamber 15 is introduced into the right reaction force chamber 19 via the through hole 12e, the supply groove 17n, and the through hole 17o, and is also introduced into the right reaction force chamber 19 through the through hole 12e, the supply groove 17n, and the through hole 17o.
It is introduced into the left reaction force chamber 20 via the through hole 17l, the communication groove 17h, and the through hole 17i.

Therefore, the spool rod 18 is maintained at the neutral position by the balance of the internal pressures of the right reaction force chamber 19 and the left reaction force chamber 20 and by the reaction force springs 21 and 22.

As can be seen from FIGS. 4 and 6, in this neutral state, the excess pressure fluid introduced into the supply groove 18b is transferred from the supply groove 17j to the supply groove 18a to
Route of through hole 17d or supply groove 17k-supply groove 1
The fluid flows out into the communication groove 17b via the path 8c-through hole 17e, and is discharged from the pressure fluid outlet 11b from the communication groove 17b through the through hole 12b-communication groove 16b.

Note that in this neutral state, the bolt 24 is inserted into the opening 2.
6, and a predetermined clearance is maintained in the horizontal direction in the drawing.

Next, when the spool rod 18 is slid to the left in the drawing with respect to the center valve rod 17 by operating the shift lever 43, the relative relationship between the center valve rod 17 and the spool rod 18 changes as shown in FIGS. Due to the positional deviation, communication between the supply groove 18b and the supply groove 17j is cut off, and the pressure fluid is introduced only into the right piston chamber 14 and the left reaction force chamber 20 through the same path as described above.

Therefore, the piston 13 is urged to the left in the figure by the hydraulic pressure in the right piston chamber 14, and the piston rod 12 is slid to the left in the figure with respect to the cylinder 11. At this time, as the piston 13 moves, the fluid in the left piston chamber 15 flows through the communication groove 16c, the through hole 12c, the through hole 17g, the supply groove 17j, and the supply groove 1.
8a - Through hole 17d - Communication groove 17b - Through hole 12b -
Pressure fluid outlet 11 passes through the path of communication groove 16b.
It is discharged from b.

Further, when the spool rod 18 is slid to the right in the figure with respect to the center valve rod 17 by operating the shift lever 43, the tenth and eleventh
As shown in the figure, due to the misalignment of the relative positions of the center valve rod 17 and the spool rod 18, the communication between the supply groove 18b and the supply groove 17k is cut off, contrary to the above, and the pressure fluid is supplied to the left piston chamber 15 and the supply groove 17k. It is introduced only into the right reaction force chamber 10 through the same route as above.

Therefore, the piston 13 is urged to the right in the drawing by the fluid pressure in the left piston chamber 15, and the piston rod 12 is slid to the right in the drawing with respect to the cylinder 11. At this time, as the piston 13 moves, the fluid in the right piston chamber 14 flows through the through hole 12d, the supply groove 17m, the through hole 17q, the supply groove 17p, and the through hole 1.
8f - Communication groove 18d - Through hole 18e - Supply groove 17k
- Supply groove 18c - Through hole 17e - Communication groove 17b - Through hole 12b - Communication groove 16b and is discharged from pressure fluid outlet 11b.

As described above, when the spool rod 18 is slightly moved relative to the center valve rod 17, the supply grooves 17j, 17k of the center valve rod 17 and the supply grooves 18a, 18b,
By switching the valve section constituted by 18c, when the spool rod 18 moves to the left in the figure, the fluid pressure in the right piston chamber 14 causes the piston rod 12 to move to the left in the figure.
8, the left piston chamber 15 moves in the right direction in the drawing.
The piston rod 12 is moved to the right in the figure by the fluid pressure inside the piston rods, with the respective moving forces being amplified.

In the operating state of the booster as described above, as shown in FIG.
Fluid pressure is introduced from a, and the internal pressure generated in the piston chamber 57 pushes the piston 55 downward in the figure, causing the piston hole 54 and the lock ball hole 5 to
It is locked to the stepped portion 61 between the three. In this state, the spring 60 generates an initial load and presses the lock ball 59 toward the piston rod 12.

As described above with respect to the booster, when the piston rod 12 is in the neutral state, the lock ball 59 is engaged with the lock ball groove 51, and the piston rod 12 is moved into the casing 5 by switching the valve section in conjunction with the operation of the spool rod 18.
2, the lock ball 59 slips out of the lock ball groove 51 and rolls on the outer peripheral surface of the piston rod 12. In this way, when the lock ball 59 comes out of the lock ball groove 51 during a shift operation, there is a resistance force generated depending on the shape of the groove 51, and a load generated by the spring 60 when the lock ball 59 rolls on the piston rod 12. acts as a load when the piston rod 12 slides, and this is transmitted from the piston rod 12 to the spool rod 18 via the reaction force chamber 19 or 20. As a result, the operator can feel the force as shown by the chain line b in FIG. A sense of moderation can be obtained from the shift lever 43.

Further, when the engine is off, that is, when the pressure system of the booster is inactive, no fluid pressure is introduced into the piston chamber 57, as shown in FIG. 3, and therefore the piston 55 is in a free state. The spring 60 will no longer function. Therefore, the piston rod 12 receives no load from the lock ball 59, making it possible to shift with less force when the engine is stopped.

In the above-mentioned booster, the reaction at the time of gear change is from the piston rod 12 and the center valve rod 17 to the left reaction force chamber 2 when the spool rod 18 moves to the left in the figure.
When the spool rod 18 moves to the right in the drawing due to the pressure fluid introduced into the right reaction force chamber 19, a reaction force is transmitted to the spool rod 18 via the pressure fluid introduced into the right reaction force chamber 19, and the operator is forced to shift. From the lever 43, it is possible to obtain a feeling when changing gears in the transmission.

In addition, when the fluid pressure system breaks down or the engine stops, the bolt 2
The input rod 23 is slid relative to the piston rod 12 until the bolt 24 engages with the end of the opening 26, and after the bolt 24 engages the piston rod 12, the input rod 23 and the piston rod 12 are slid together as a unit to shift. Operation becomes possible.

FIG. 12 shows another embodiment of the present invention in which the input rod 23 is provided with a lock ball groove 51'.

Furthermore, as another embodiment, the lock ball grooves may be formed not only at the neutral position of the piston rod 12 or the input rod 23 but also at the completion position of the speed change operation. This allows the operator to easily sense the completion of the shift operation.

(Effects of the Invention) As described above, in this invention, the lock mechanism holds the inlet rod or the output rod at a neutral position with respect to the casing, and when the input rod or the output rod slides during a shift operation,
By applying a load to the rod, it is possible to give a sense of moderation to the shift operation and improve the shift feeling.

Furthermore, since the switching mechanism turns the lock mechanism on and off in conjunction with turning on and off the engine, the lock mechanism is released when the engine is stopped, facilitating shift operations when the engine is stopped.

As a method for holding the input rod or output rod in a neutral position with respect to the casing, the 17th
As shown in the figure, it was also considered to attach a spring 60' to the casing to bias the lock ball 59', but with this mechanism, even when the engine is stopped and the booster is inactive, the lock ball 59'
9' causes a load to be applied to the rod, making the shift operation extremely heavy when the engine is stopped.

On the other hand, in the present invention, as described above, the locking mechanism is released by the switching mechanism when the engine is stopped, so there is no such concern at all.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a partially enlarged view of the same embodiment in an operating state,
FIG. 3 is a partially enlarged view of FIG. 2 in an inoperative state;
FIG. 4 is a sectional view showing the booster according to the same embodiment at the position of the pressure fluid outlet, FIG. 5 is a sectional view showing the same embodiment at the position of the pressure fluid inlet, and FIG. is a schematic diagram showing the pressure fluid flow path in the neutral state of the same example, Figure 7 is a layout diagram showing the mounting state of the booster, and Figure 8 is a diagram showing the spool rod in Figure 4 moved in one direction. 9 is a schematic diagram showing the flow path of pressure fluid in the state shown in FIG. 8. FIG. 10 is a sectional view showing the state when the spool rod moves in the other direction. FIG. 11 is a schematic diagram showing the flow path of pressure fluid in the state of FIG. 10,
Fig. 12 is a sectional view showing another embodiment of the present invention, Figs. 13 to 15 are sectional views showing a conventional example, and Fig. 16 is a sectional view showing another embodiment of the present invention.
The figure is a graph comparing the shift forces of the present invention and a conventional example, and FIG. 17 is a diagram showing another conventional example. 11...Cylinder, 11a...Pressure fluid inlet, 11
b...Pressure fluid outlet, 12...Spool rod, 1
3... Piston, 14... Right piston chamber, 15... Left piston chamber, 17... Center valve rod, 17j,
17k...Supply groove, 18...Spool rod, 18
a, 18b, 18c...supply groove, 19...right reaction force chamber,
20... Left reaction force chamber, 24... Bolt, 26... Opening,
27... Striker, 50... Moderation feeling improvement mechanism, 51
... Lock ball groove, 52 ... Casing, 55 ... Piston, 57 ... Piston chamber, 58 ... Communication hole, 59
...Rock ball, 60...Spring.

Claims (1)

[Scope of Claims] 1. A booster device for operating a transmission that uses pressure fluid as a drive source, which is provided between a casing and an input rod or an output rod, and has an elastic groove and a groove formed on the outer periphery of the input rod or output rod. It has a lock ball that is removably engaged with the groove by being biased by a member, and holds the input rod or the output rod in a neutral position with respect to the casing and applies a load to the rod. a locking mechanism that allows the rod to slide with respect to the casing while applying pressure; a piston chamber connected to the pressure system of the booster; and a pressure inside the piston chamber that causes the elastic member to be moved toward the input or output rod side. A booster for operating a transmission, characterized in that it has a piston that operates to bias the transmission, and a switching mechanism that turns on and off the lock mechanism in conjunction with the on and off of the pressure system. Mechanism to improve sense of moderation.