JPH0520623B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a booster for operating a transmission of an automobile or the like using pressure fluid.

(Prior art) As a conventional booster for a transmission, there is a
There is one described in the 655 publication.

This conventional booster, as shown in Figure 11,
In the cylinder 1, an input rod 2 and a fixed piston 3 fixed to a housing 4 are slidably arranged in series.
The cylinder 1 is moved relative to the fixed rod 3 by switching the valve part 5 by the input rod 2, and the transmission is operated via the transmission lever 6 fixed to the cylinder 1. It was something I had become accustomed to.

(Problems to be Solved by the Invention) However, this conventional booster is composed of a valve part 5 that controls pressure fluid and a fixed piston 3, and a booster that generates an output in response to fluid pressure from the valve part 5. Since the parts 7 and 7 are arranged in series, the overall size of the apparatus becomes large and the weight also increases accordingly.

An object of the present invention is to eliminate the drawbacks of the conventional booster as described above and provide a small and lightweight booster.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a cylinder made of aluminum material having a pressure fluid inlet and a discharge port, and a cylinder that is slidably inserted into the cylinder. a piston rod, an inner interposed between the piston rod and the cylinder and made of the same FC material as the piston rod, a piston formed on the outer periphery of the piston rod and forming piston chambers on both sides in the cylinder, and an input rod. The spool rod is connected to the piston rod and is slidably inserted into the piston rod, and the piston chamber configured within the piston rod acts on the piston chamber in each direction of movement when the spool rod moves relative to the piston rod from its neutral position. and a fluid passage formed in the inner and piston rods and communicating the pressure fluid inlet or outlet of the cylinder and the valve part in the radial direction of the cylinder and the spool rod, respectively. (Function) The booster for transmission operation according to the above invention is characterized in that the pressure fluid introduced from the pressure fluid inlet of the cylinder is
The fluid flows in the radial direction of the cylinder and piston rod through fluid passages formed in the inner and piston rods, and is supplied to the valve section. As the spool rod moves relative to the piston rod, pressure fluid is introduced into the piston chamber that acts in each direction of movement of the spool rod by switching the valve section, and the fluid pressure in the piston chamber acts on the piston to move the piston rod into the cylinder. to change the gears of the transmission.

This booster is lightweight because the cylinder is made of aluminum, and the difference in expansion caused by the difference in material between the cylinder and piston rod is compensated for by the cylinder being made of the same material as the piston rod. This is reduced by the fact that the inner is interposed and bears the piston rod.

In addition, the piston chamber and valve part are arranged in parallel,
Moreover, since the fluid passage for supplying fluid pressure to the valve part and the discharge passage from the valve part are arranged along the radial direction of the cylinder and piston rod, the device can be miniaturized. However, the weight reduction has been achieved.

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

1 shows a cross section taken along the line AB in FIG. 3, and FIG. 2 shows a cross section taken along the line AC in FIG. 3. In FIGS. 1 and 2, a piston rod 1 is attached to the cylinder 11, which is composed of a piston cylinder 11A and a cylinder body 11B.
An annular piston 13 is fitted on the outer periphery of the right end of the piston rod 12 so as to be slidable in the axial direction. And this piston 13
As a result, a space between the inner circumferential surface of the piston cylinder 11A and the outer circumferential surface of the piston rod 12 is separated on both sides to form a right piston chamber 14 and a left piston chamber 15. Also cylinder body 11
A cylindrical inner 16 is press-fitted into the inside of B between it and the piston rod 12.

The cylinder 11 is made of aluminum to reduce the weight of the device, and the inner 16 is made of FC material to prevent the cylinder 11 from being affected by thermal expansion of the piston rod 12 due to differences in operating temperatures of the pressure fluid. It is formed.

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 18 is installed in this center valve rod 17.
is fitted 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 collars 17A and 17B and the spool rod 18 in the right reaction force chamber 19 and the left reaction force chamber 20, and keep the spool rod 18 in a neutral position with respect to the center valve rod 17. keeping.

The cylinder body 11B has a pressure fluid inlet 11a.
(Fig. 2) and pressure fluid outlet 11b (Fig. 1)
The inner 16 has three communicating grooves 16a, 16b, and 16c extending in the axial direction, the arrangement of which is shown in FIG. 16a is pressure fluid inlet 1
1a and the communication groove 16b communicate with the pressure fluid outlet 11b. In addition, the piston rod 12 has three through holes 12a, 12b, 12c at positions facing each of the communication grooves 16a, 16b, 16c of the inner 16.
are formed, and communication grooves 16a, 16b, 1 are formed respectively.
It is connected to 6c.

A communication groove 17b (FIG. 1) 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. 2) 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, a communication groove 17 extending in the axial direction on the outer circumference of the center valve rod 17 is located at a position to 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, 18c are formed, and the supply groove 18a on the right side in the figure communicates with the through hole 17d, and the supply groove 18c on the left side in the figure communicates with the through hole 17e, respectively (FIG. 1). Further, the supply groove 18b at the center of the figure is communicated with the communication groove 17a of the center valve rod 17 through a through hole 17f (FIG. 2). A communication hole 18d extending along the axis is formed in the center of the spool rod 18, and the left side of the communication hole 18d in the figure 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 12d 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 opposite to the supply groove 17m on the right side in 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.

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 the neutral state, the bolt 24 is located at the center of the opening 26, and the bolt 24 is located at the center of the opening 26, and extends outward from the opening 26 which is opened at the upper and lower positions of the bolt 26. A predetermined clearance is maintained between each.

A striker 27 is fixed to the outer periphery of the piston rod 12 at a position corresponding to the bolt 24, and a shift inner 28 is connected to the striker 27. This shift inner 28 has a fourth
As shown in Fig. 5, a change lever 29 is slidably fitted, and the change lever 29 is moved in the direction of arrow A in Fig. 5 by a mechanism not shown, and a plurality of change levers 29 are arranged in parallel. The forks 31 of the shift fork shaft 30 are sequentially engaged with each other. The structure and operation of these shift inner 28, change lever 29, fork 31, and shift fork shaft 30 are known.

As shown in FIG. 6, 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.

Next, the operation of the booster is shown in Figures 3 and 7.
The explanation will be given with reference to FIG. Here, the third
Figures 8 and 10 are diagrams each schematically showing the connection state of each hole or groove in the operating position of the spool rod.

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. 1-3. As can be seen from FIGS. 2 and 3 in this neutral 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. 1 and 3, 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 position of the center valve rod 17 and the spool rod 18 is changed as shown in FIGS. 7 and 8. Due to the misalignment of the supply groove 1
8b and the supply groove 17j are 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 fluid 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-
Through hole 12c - Through hole 17g - Supply groove 17i - Supply groove 18a - Through hole 17d - Communication groove 17b - Through hole 12b
- Pressure fluid outlet 1 through the path of communication groove 16b
It is discharged from 1b.

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 9th and 10th
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 19 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 hole 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,
When the spool rod 18 moves to the left in the drawing by switching the valve portion constituted by the piston rod 18c, the piston rod 12 moves to the left in the drawing by the fluid pressure in the right piston chamber 14.
In response to the movement of the piston rod 12 in the right direction in the drawing, the piston rod 12 is moved in the right direction in the drawing by the fluid pressure in the left piston chamber 15, with its moving force being amplified.

This movement of the piston rod 12 is the striker 2.
7-Shift inner 28-Change lever 29-Shift fork shaft 30 via fork 31
, and the gear change of the transmission 41 is performed.

Also, the reaction during this gear change is,
Piston rod 12 and center valve rod 1
7, the pressure fluid introduced into the left reaction force chamber 20 when the spool rod 18 moves to the left in the figure, and the pressure introduced into the right reaction force chamber 19 when the spool rod 18 moves to the right in the figure. The reaction force is transmitted to the spool rod 18 via the fluid, and the operator can feel the feeling of changing gears in the transmission from the shift lever 43.

Also, in the event of a fluid pressure system failure, the input rod 23 is slid relative to the piston rod 12 in either direction until the bolt 24 engages the end of the opening 26; In this case, the input rod 23 and the piston rod 12 are slid together and the shift operation becomes possible, but does not become inoperable.

This booster is lightweight because the cylinder 11 is made of aluminum material. Here, the materials of the cylinder 11 and the piston rod 12 have different coefficients of thermal expansion, but there is FC inside the cylinder 11.
Since the inner 16 made of a material is press-fitted and bearing the piston rod 12, the difference in expansion between the cylinder 11 and the piston rod 12 can be reduced even if the working temperature difference of the pressure fluid is large, and the difference in the pressure fluid can be reduced. Efficiency loss due to this can be reduced. Then, a communication groove is formed in the inner 16, and the cylinder 11
Pressure fluid inlet 11a or pressure fluid outlet 11
b and a valve section configured within the piston rod 12 in the radial direction of the piston rod 12, the device can be made more compact, and this also makes the device more compact. has been done.

(Effects of the Invention) As described above, in this invention, since the cylinder is made of aluminum material, it can be made lighter than the conventional cylinder, and the difference in expansion between the cylinder and the piston rod is reduced. is reduced by the inner installed in the cylinder bearing the piston rod,
Efficiency loss due to pressure fluid leakage can be reduced.

Furthermore, a valve part for switching the introduction of fluid pressure into each piston chamber is formed in the piston rod and arranged in parallel with the piston part, and the pressure fluid is supplied between the cylinder and the piston rod between the pressure fluid inlet or the pressure fluid outlet and the valve part. Since the fluid is configured to flow in the radial direction, the device can be made smaller and lighter. Furthermore, in a preferred embodiment of the present invention, it is possible to provide a reaction force chamber that opposes the direction of movement of the spool rod at the same location as the piston portion, the valve portion, etc.
As well as being compact, it is possible to provide a corresponding operational feel to the manual operation member (shift lever) during boosting.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention at the position of the pressure fluid outlet, FIG. 2 is a cross-sectional view of the same embodiment at the position of the pressure fluid inlet, and FIG. FIG. 4 is a schematic diagram showing the flow path of pressure fluid in the neutral state of the same embodiment, FIG. 4 is a diagram showing the connection state of the piston rod and fork shaft in the same embodiment, and FIG. 6 is a layout diagram showing the mounting state of the booster according to the present invention; FIG. 7 is a sectional view showing the state when the spool rod of FIG. 1 is moved in one direction; Fig. 8 is a schematic diagram showing the pressure fluid flow path in the state shown in Fig. 7, Fig. 9 is a sectional view showing the state when the spool rod has moved to the other port, and Fig. 10 is the state shown in Fig. 9. FIG. 11 is a cross-sectional view showing a conventional example. 11...Cylinder, 11a...Pressure fluid inlet,
11b... Pressure fluid discharge port, 12... Piston rod, 13... Piston, 14... Right piston chamber, 15... Left piston chamber, 17... Center valve rod, 17j, 17k... Supply groove, 18...
Spool rod, 18a, 18b, 18c... Supply groove, 19... Right reaction force chamber, 20... Left reaction force chamber, 2
4... Bolt, 26... Opening, 27... Striker.

Claims (1)

[Claims] 1 A cylinder made of aluminum and having a pressure fluid inlet and a discharge port, a piston rod that is slidably inserted into this cylinder, and an FC that is the same as the piston rod and is interposed between this piston rod and the cylinder. a piston that forms piston chambers on both sides in a cylinder formed on the outer periphery of the piston rod; a spool rod connected to the input rod and slidably inserted into the piston rod; a valve portion configured to switch to introduce pressure fluid only into the piston chambers acting in each direction of movement when the spool rod moves relative to the piston rod from a neutral position; A booster for operating a transmission, comprising a fluid passage connecting the pressure fluid inlet or outlet of the cylinder and the valve portion in the radial direction of the cylinder and the spool rod, respectively.