JPH0514134B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides cam means corresponding to a plurality of pressure regulating valves disposed in a hydraulic circuit of an automatic transmission, and the cam means is connected to a plurality of pressure regulating valves. The present invention relates to a pressure regulating valve device which provides desired conditions corresponding to the respective pressure regulating means of the pressure regulating valve by applying the same input to these cam means in contact with a plunger.

(Prior Art) In recent years, as vehicles equipped with automatic transmissions have become widespread, evaluation of automatic transmission performance has also become more severe. In particular, the shift shock that occurs when changing the gear train in an automatic transmission is of particular concern because it affects the senses of the passenger, and its evaluation is even more severe.

In order to eliminate this shift shock, many methods and devices have been proposed and put into practical use.
On the other hand, improvements in the efficiency of the automatic transmission itself,
There is also a demand for smaller size and lighter weight.

By the way, automatic transmissions transmit rotational torque to and stop the elements by appropriately selecting frictional engagement devices (or restraint devices) attached to the constituent elements of the gear train using a hydraulic circuit based on various conditions. The gear train is switched by The frictional engagement device (or restraint device) is operated by a hydraulic servo and an actuator provided in a hydraulic circuit.

In this case, the pressure of the hydraulic oil that operates the hydraulic servo etc. is changed in accordance with the output of the engine. This is normally done using a throttle valve (pressure regulating valve) that generates a pressure corresponding to the throttle opening. The throttle pressure of the throttle valve works together with the governor pressure corresponding to the vehicle speed as a signal for switching the shift control valve.

(Problem to be Solved by the Invention) As described above, the throttle pressure corresponding to the throttle opening is used for main pressure control and gear shift control, but in order to perform gear shift control smoothly, the throttle pressure is used under different conditions. It is desirable to make it work. Usually, a cam means that moves in conjunction with the accelerator pedal is used to operate the pressure regulating means of the throttle valve to achieve desired conditions. However, if the cam means were simply provided separately to correspond to each throttle valve, and an input member was separately provided for each cam means, the mechanism would be complicated and take up too much space. Further, when the plunger that comes into contact with the cam means of these pressure regulating valves is guided by a sleeve inserted into the body, there is a problem that positioning and fixing the sleeve is troublesome.

The present invention has been made to solve the above problems. That is, an object of the present invention is to provide a pressure regulating valve device that has a simple mechanism and occupies a small space. Another object of the present invention is to provide a pressure regulating valve device that facilitates positioning and fixing of a sleeve used as a guide for the plunger of the pressure regulating valve.

(Means and Actions for Achieving the Object) In order to achieve the above object, the present invention provides solutions for each of a plurality of pressure regulating valves disposed in the hydraulic circuit of an automatic transmission. In a pressure regulating valve device, the cam means is provided with a cam means for controlling the pressure regulating means of the pressure regulating valve, and the cam means is brought into contact with the plunger of the pressure regulating valve, and the same input is applied to the cam means, thereby providing desired conditions respectively corresponding to the pressure regulating means of the pressure regulating valve. , the pressure regulating valves are arranged parallel to each other and adjacent to each other, the corresponding cam means are connected to each other by a connecting member so as to rotate integrally with each other, each of the cam means is supported by one support member, and this support The member is a substantially U-shaped bracket, and the support member is fixed to the plunger side of the plurality of pressure regulating valves, serves as a front cover of the pressure regulating valves, and is in contact with the end face of the valve body of the pressure regulating valves. There is.

According to the present invention, a plurality of pressure regulating valves are arranged parallel to each other and adjacent to each other, and the corresponding cam means are connected by a connecting member so as to rotate integrally with each other, and each of the cam means is supported by a single support member. And since this support member is made into a roughly U-shaped bracket,
The mechanism is simple and the space occupied can be reduced. Further, by appropriately setting the cam profiles of the plurality of cam means, it is possible to obtain a plurality of arbitrary hydraulic characteristics for one input signal.

(Example) Hereinafter, specific examples of the present invention will be described with reference to the drawings.

The first throttle valve 1 shown in Fig. 1 is a throttle valve for main pressure control, and the pressure from the pump is increased by applying the hydraulic pressure regulated according to the throttle opening as back pressure to the regulator valve. The main pressure in the oil passage is regulated by adjusting the oil to the throttle opening.

The first throttle valve 1 includes a spool 4 with a spring 3 mounted on one side (left side in the figure) of the valve body 2, a plunger 5 arranged in series with the spool 4, and a plunger 5 between the spool 4 and the plunger 5. A pressure regulating spring 6 is provided. The plunger 5 is structured to be guided by a sleeve 7. The sleeve 7 is positioned by a spring 8 interposed between the sleeve 7 and the valve body 2 and a support member 9 fixed to the front surface of the valve body. The support member 9 has a U-shaped cross section (substantially U-shaped)
The bracket has a shape in which the back surface of the bracket is fixed to the front surface of the valve body 2.

3 from the direction of the back spring 3 to the spool 4.
Three lands 10, 11, 12 are formed in the valve body 2, and three ports 13, 12 are formed in the valve body 2 correspondingly.
14 and 15 are formed. In this example, lands 11 and 12 have the same diameter, and land 10 has a smaller diameter. center port 1
4 is a pressure oil supply port from the pump, the port 15 on the right is an output port and is connected to the back pressure port of the regulator valve, and the port 13 on the left is a back pressure port, which is connected to the output port 15 and appropriate throttling means. are connected via.

Plunger 5 also has three lands 16, 17, 1
Correspondingly, the valve body 2 has three ports 19, 20,
21 is formed. The port 19 on the left side of the figure is a supply port from the regulator valve, the center port 20 is an output port and is connected to, for example, a port of an actuator, and the port 21 on the right side is used, for example, as a drain port from the actuator.

This first throttle valve 1 is connected to the transmission case 22
and the oil pan 23, and a gasket 24 and a plate 2 are located in the lower part of the valve body 2.
A lower valve body 26 is arranged with the valve body 5 in between. Furthermore, a strainer 28 is attached to the lower part.

The second throttle valve 31 is constructed as shown in FIG. This second throttle valve 31 is a throttle valve for shift control, and has an output port connected to one back pressure port of the shift valve, and works together with a governor connected to the other back pressure port to control the shift valve. is operated, and a frictional engagement device or a restraint device connected to the shift valve is appropriately selected to perform a gear change corresponding to the throttle opening and vehicle speed.

This second throttle valve 31 has a spring 33 interposed between one end (on the left in the figure) and the valve body 32 in a valve body 32 that is integrally formed with the valve body 2 of the first throttle valve 1 described above. equipped spool 34, said spool 3
4 and a pressure regulating spring 36 interposed between the spool 34 and the plunger 35. This plunger 3
5 is also structured to be guided by a sleeve 37. Like the sleeve 7, the sleeve 37 is positioned by a spring 38 interposed between the sleeve 7 and the valve body and a support member 9 fixed to the front surface of the valve body.

Four lands 39, 40, 41, and 42 are formed on the spool 34 from the side where the spring 33 is attached. In this example, the lands 41 and 42 have the same diameter, and the land 40 has a smaller diameter and is larger than the land 39. Correspondingly, four ports 43, 44, 45, and 46 are formed in the valve body 32.

The two ports 43 and 44 on the left end are back pressure ports,
The next port 45 is a supply port from the pump, and the rightmost port 46 is an output port, which is connected to one back pressure port of the shift valve. Back pressure port 4
At least one of 3 and 44 is connected to the output port via a suitable throttle means. Note that an appropriate signal pressure may be guided to the other port.

Two lands 47 and 48 are formed on the plunger 35, and a port 49 that communicates with the inside of the sleeve 37 is formed on the valve body 32. This port 49 is connected to the back pressure port 43 on the spool 34 side, and is normally used as a drain port.

As shown in FIG. 3, these two throttle valves 1 and 31 are arranged in parallel and adjacent to each other with their plunger sides aligned. In this example, the first throttle valve 1 is used for pressure control, and the second throttle valve 31 is used for shift control. However, they may be interchanged, and one of them may be used for back pressure of an accumulator for shift control. Alternatively, it may be used as a signal pressure for a trimmer valve for speed change control.

As can be seen from FIGS. 3 to 6, the cam means 50 includes first and second cams 51, 52 corresponding to the first and second throttle valves 1, 31, and connecting these cams 51, 52. The first and second cams 51 and 52 are
Shaft 55 rotatably supports the shaft 5.
The shaft 55 includes a return spring 57 which is disposed through a spacer 56 on the shaft 55 and returns the cam to its original position, and a support member 9 which is a substantially U-shaped bracket that supports the shaft 55. shaft 55
is fixed to the support member 9 with a clip 58. The first and second cams 51 and 52 are located within the support member 9, and their positions are regulated by the spacer 59 and the aforementioned clip 58.

The first and second cams 51 and 52 are formed into different shapes considering the roles of the respective throttle valves 1 and 31, and the plungers 5 and 35
The rollers 60 and 61 are placed at the tips of the rollers 60 and 61, respectively.

One end of the return spring 57 is connected to the first cam 5
1, and the other end is locked to a support member 9.

The input means for the first and second cams 51, 52 is a wire 63 connecting the first cam 51 and the accelerator pedal, as shown in FIG. One end of the wire 63 is fixed to the outer periphery of the cam 51, and its extension is guided to the accelerator pedal through a groove provided on the outer periphery of the cam 51.

When the accelerator pedal is depressed, the throttle opens according to the amount of depression, and the cams 51 and 52 rotate at the same time. As the cams 51, 52 rotate, the plungers 5, 35, which come into contact with the outer peripheries of the cams 51, 52 via rollers 60, 61, are driven within the sleeves 7, 37, and the pressure regulating springs 6, 36 are separately actuated. flex and apply different loads to each. The pressure regulating springs 6, 36 apply a load to the springs 3, 33 according to the given amount of deflection, and the supplied hydraulic pressure is regulated in accordance with the load of the pressure regulating springs 6, 36, so that the respective throttle pressures are adjusted. Output port 1
It is output from 5,46.

The throttle pressure also acts on the back pressure ports 13, 43, or 44 of each valve 1, 31, and if the amount of hydraulic oil coming out of the output ports 15, 46 increases and the throttle pressure decreases, The spools 4 and 34 move back to open the valve, and at the same time the throttle pressure approaches the throttle pressure corresponding to the throttle opening degree, stable hydraulic fluid is supplied. Conversely, when the amount of hydraulic oil decreases, the spools 4 and 34 move forward to close the valve and reduce the throttle pressure to a predetermined throttle pressure.

When the amount of depression of the accelerator pedal becomes small, the cams 51 and 52 are activated by the return spring 57.
The engine rotates in the opposite direction until the accelerator is opened. Following this, the plungers 5 and 35 also operate, and the valve operations as described above are performed.

FIGS. 7 and 8 show other embodiments of the present invention. Cams 51 and 52 are supported on shaft 55 via bearings 70 and 71, respectively. These cams 51, 52 are
They are connected by a connecting member 72 that is fixed on the outer periphery of the two or integrally formed. Further, the axial positions of these cams 51 and 52 are regulated by a spacer 73, a collar 74, and a clip 58 on a shaft 55 attached to a support member 9 that is a substantially U-shaped bracket. cam 51,
A return spring 75 for returning 52 is arranged around the collar 74 and has one end connected to the connecting member 72.
The other end is locked to the support member 9. The operation of this embodiment is basically the same as that of the previously described embodiment, so the explanation thereof will be omitted.

(Effects of the Invention) According to the present invention, a plurality of pressure regulating valves are arranged parallel to each other and adjacent to each other, and the corresponding cam means are connected to each other by a connecting member so as to rotate integrally with each other, and the respective cam means are connected together so as to rotate together. The mechanism is simple because it is supported by two support members, and this support member is a roughly U-shaped bracket, and this bracket is brought into contact with the end face of the valve body of the pressure regulating valve and also serves as the front cover of the pressure regulating valve. Moreover, the occupied space can be reduced. Furthermore, the accuracy of the contact between the valve and the cam, which are assembled against the end face of the valve body, can be improved, and it is possible to prevent the valve from collapsing.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is a sectional view showing the relationship between the second throttle valve and the cam in the same embodiment, Figure 3 is a plan view of the same embodiment, Figure 4 is a front view of Figure 3, and Figure 5 is the same embodiment. Fig. 6 is a cross-sectional view taken along the - line in Fig. 3;
FIG. 7 is a sectional view showing another embodiment of the present invention;
The figure is a side view of FIG. 7. 1, 31... Throttle valve, 5, 35... Plunger, 6, 36... Pressure regulating spring, 9... Support member, 50... Cam means, 53... Connection member,
63...Wire, 72...Connection member.

Claims (1)

[Claims] 1. Providing cam means corresponding to each of the plurality of pressure regulating valves arranged in the hydraulic circuit of the automatic transmission, and applying the same input to these cam means by bringing the cam means into contact with the plunger of the pressure regulating valve. In a pressure regulating valve device that provides desired conditions corresponding to the respective pressure regulating means of the pressure regulating valve, the pressure regulating valves are disposed parallel to each other and adjacent to each other, and the corresponding cam means are rotated integrally with each other by a connecting member. Each cam means is supported by one support member, and this support member is a substantially U-shaped bracket, and the support member is fixed to the plunger side of the plurality of pressure regulating valves. A pressure regulating valve device, which also serves as a front cover and is brought into contact with an end face of a valve body of the pressure regulating valve.