JP4283610B2 - Clutch switching valve device in torque converter with transmission - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a clutch switching in a torque converter with a transmission that is provided in a hydraulic circuit of a torque converter with a transmission and that selectively supplies pressure oil from an oil pump to a plurality of clutches to turn the clutch on and off. The present invention relates to a valve device.
[0002]
[Prior art]
Among torque converters with a transmission, a regulator valve, an accumulator, and a clutch are included in the hydraulic circuit of the torque converter, as in the patent application previously filed by the applicant of the present application (see Japanese Patent Application No. 2002-104271). A solenoid valve for switching is provided, and the pressure oil from the oil pump is regulated and supplied to the torque converter, and selectively supplied to a plurality of forward and backward clutches so as to be turned on / off. There is what I did.
[0003]
[Problems to be solved by the invention]
In the above-mentioned prior application, immediately after the solenoid valve is operated, for example, to switch the clutch from forward to reverse, the oil accumulated in the accumulator is suddenly pumped by the piston to the clutch, and the reverse clutch is connected. As a result, the clutch plates suddenly contact each other, causing a problem of shock.
[0004]
In addition, after switching the clutch, the accumulator is supplied with pressure oil from the oil pump in order to smoothly connect the reverse clutch and to maintain the connected state. Since the pressure oil is supplied through a relatively small orifice, there has been a problem that the increase in hydraulic pressure is slow and the time until the clutch is completely connected (half-clutch state) is long.
[0005]
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a clutch switching valve device in a torque converter with a transmission that can quickly connect a clutch by reducing a shock. Yes.
[0006]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) A clutch switching valve device which is provided between an oil pump and a clutch in a hydraulic circuit of a torque converter with a transmission and which turns on and off the clutch by supplying pressure oil from the oil pump to the clutch. In addition, a control valve that supplies pressure oil to the clutch is provided in the hydraulic circuit downstream of the oil pump, and the hydraulic circuit between the control valve and the clutch is slidable in a cylindrical valve body. And a piston having an oil groove on the outer peripheral surface, a biasing means for constantly biasing the piston toward one side end of the valve body, and the piston provided at the one side end. The oil groove communicates with the oil groove on the outer peripheral surface, and the oil groove communicates with the discharge port of the control valve. Accordingly, a first inlet port and a first outlet port that allow pressure oil from the control valve to be supplied to the clutch, a side end surface of the piston opposite to the biasing means, and a side end in the valve body are formed. An orifice-shaped second inlet port that communicates with the oil chamber and introduces pressure oil from the control valve into the oil chamber, and also communicates with the oil chamber, and pressure oil discharged from the oil chamber serves as the clutch. And an accumulator valve having a second outlet port for supplying to the accumulator.
[0007]
(2) In the above item (1), the valve bodies of the two accumulator valves that supply pressure oil to different clutches are formed in a cylindrical shape with one open end, and the open ends are abutted to meet each other. The two accumulator valves are integrated by combining the two and by compressing a compression coil spring between the opposing surfaces of the pistons in each valve body.
[0008]
(3) In the above item (1) or (2), the control valve is a 4-port 3-position switching type solenoid valve.
[0009]
(4) In the above item (2) or (3), the first and second outlet ports of one accumulator valve are connected to the forward clutch, and the first and second outlet ports of the other accumulator valve are moved backward. Connect to the clutch.
[0010]
(5) In any of the above items (1) to (4), a 4-port 2-position switching type solenoid valve for speed switching is provided in the hydraulic circuit connected to the first and second outlet ports of the accumulator valve. At the same time, a forward low speed clutch and a high speed clutch are provided in the downstream hydraulic circuit.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a torque converter with a transmission to which the present invention is applied and its hydraulic circuit. (1) is an oil pump that sucks and pumps oil from an oil pan (2), (3) is a torque converter, (4) is a transmission connected to the torque converter, (5) is a main pressure regulator valve for adjusting the hydraulic pressure supplied to the torque converter (3), and (6) is a pressure oil from the torque converter (3). Regulator valve that regulates the outlet pressure of the engine, (7) is a line filter, (8) and (9) are a forward low speed clutch that transmits power to a forward gear (not shown) of the transmission (4) and a high speed The clutch (10) is a reverse clutch that similarly transmits power to a reverse gear (not shown).
[0012]
Each clutch (8), (9) and (10) is lubricated by oil flowing out from the line filter (7).
[0013]
The main hydraulic circuit (11) connected to the oil pump (1) is composed of a 4-port 3-position switching solenoid valve (12) for forward / reverse switching, and an accumulator device (13) on the downstream side. An inventive clutch switching valve device (14) is provided.
[0014]
The accumulator device (13) includes the forward low-speed and high-speed clutches (8) and (9) through a 4-port 2-position switching solenoid valve (15) for speed switching provided downstream of the accumulator device (13). It is connected to the reverse clutch (10).
[0015]
In the circuit of FIG. 1, the solenoid valve (12) is switched to the forward side, and the pressure oil flowing out from the port passes through the accumulator device (13) and the solenoid valve (15) switched to the low speed side. The state is shown in which the low-speed clutch (8) is supplied and connected (ON).
[0016]
Next, the structure and operation of the accumulator device (13) will be described in detail with reference to FIGS.
[0017]
The accumulator device (13) includes a forward half accumulator valve (16) having a guide hole (18) (18) whose opposite ends are open and side ends are closed, and a left half The valve body (16a) (17a) is fixed to the flange (16b) (17b) formed on the outer peripheral surface of the opposing end with screws (19). As a result, the guide holes (18) are joined together so as to be continuous in the left-right direction.
[0018]
In the left and right guide holes (18), pistons (21) and (21) having the same shape and having an annular oil groove (20) on the outer peripheral surface of the inner end portion are slidably fitted in the left and right directions. Both pistons (21) are constantly urged outward by a compression coil spring (22) that is contracted between the opposing surfaces.
[0019]
A stopper shaft (24) is formed on the outer end surface of each piston (21) so as to form an oil chamber (23) therebetween by contacting the side end surface of the guide hole (18). .
[0020]
The left and right valve bodies (17a) and (16a) have a large flow passage cross-sectional area communicating with the oil grooves (20) when the left and right pistons (21) are positioned at the left limit and the right limit, respectively. The one inlet port (25) (25) and the first outlet port (26) (26) are formed to face each other so as to communicate with each other.
[0021]
Each valve body (16a) (17a) communicates with each first inlet port (25) and has an orifice-shaped second inlet port (27) (27) that opens to the oil chamber (23). Second outlet ports (28), (28) communicating with the respective first outlet ports (26) and opening to the oil chamber (23) and having a flow passage cross-sectional area larger than the second inlet port (27) are formed. Has been.
[0022]
Each of the first inlet ports (25) is connected to a discharge port (not shown) of the solenoid valve (12) via circuits (29) and (29), and the left first outlet port (26) is The reverse clutch (10) is connected via a circuit (30).
[0023]
The right first outlet port (26) is connected to an inlet port (not shown) of the solenoid valve (15) for speed switching via a circuit (31) and discharge of the solenoid valve (15). It is connected to the low speed clutch (8) and the high speed clutch (9) via circuits (32) and (32) connected to ports (not shown).
[0024]
Next, the operation of the accumulator device (13) will be described.
As shown in FIG. 1, the forward / reverse switching solenoid valve (12) is switched to one forward position, and the speed switching solenoid valve (15) is switched to one low speed position, and the low speed clutch (8 ) Is connected, the pressure oil that has exited the solenoid valve (12) flows into the first inlet port (25) of the forward accumulator valve (16) and passes through the second inlet port (27). By flowing into the oil chamber (23), as shown in FIG. 2, the right piston (21) moves to the left against the urging force of the compression coil spring (22).
[0025]
Thereby, the low speed clutch (8) is maintained in the connected state by the pressure oil supplied through the hydraulic pressure (23), the second outlet port (28) and the first outlet port (26).
[0026]
Further, in this state, when the speed switching solenoid valve (15) is switched to the other, the high speed clutch (9) is connected.
[0027]
When the solenoid valve (12) is switched to the other reverse position to connect the reverse clutch (10), as shown in FIG. 3, pressure oil flows toward the left reverse accumulator valve (17), and the right side When the supply of pressure oil to the forward accumulator valve (16) is stopped, the low-speed clutch (8) connected so far is turned off, and the pressure oil in the oil chamber (23) is By discharging from the drain port (not shown) of 12), the piston (21) of the forward accumulator valve (16) is returned to the right limit position by the compression coil spring (22).
[0028]
Immediately after switching the solenoid valve (12) to the reverse side, the pressure oil supplied to the reverse accumulator valve (16) is, as shown in FIG. 3, the first inlet port (25) and the piston communicating therewith. It flows rapidly through the oil groove (20) of (21) toward the first outlet port (26).
As a result, the connection of the reverse clutch (10) is started and a half-clutch state is established.
[0029]
At this time, the pressure of the pressure oil supplied to the reverse clutch (10) is only the line pressure of the main hydraulic circuit (11), and is not pressurized and fed by the piston of the accumulator as in the prior art. The shock when they come into contact with each other is alleviated.
[0030]
Immediately after the start of the connection of the reverse clutch (10), when a predetermined time elapses, the pressure oil flows from the first inlet port (25) toward the orifice-like second inlet port (27) and enters the oil chamber (23). Inflow.
Then, as shown in FIG. 4, the piston (21) is pressed to the right against the compression coil spring (22), whereby the first inlet port (25) is closed and the oil chamber (23). The hydraulic pressure inside is gradually increased.
[0031]
As a result, the pressure oil in the oil chamber (23) flows out from the second outlet port (28), merges with the first outlet port (26), and uses the pressure oil supplied to the reverse clutch (10). By applying pressure, the reverse clutch (10) is completely connected and maintained in that state.
[0032]
At this time, since the reverse clutch (10) is started to be connected by the pressure oil supplied through the oil groove (20) of the piston (21) in the initial stage of switching, the second inlet port having an orifice shape is used. The cross-sectional area of (27) is relatively large, pressure oil is allowed to flow quickly into the oil chamber (23), the moving speed of the piston (21) is increased, and the time required to connect the reverse clutch (10) is shortened. be able to.
[0033]
In the state shown in FIG. 4, when the solenoid valve (12) is switched again to one forward position, the reverse clutch (10) is turned off, and at the same time, the forward accumulator valve (16) is operated as shown in FIG. By entering the state, the low speed clutch (8) is turned on.
[0034]
In the above-described embodiment, in order to reduce the number of parts, the opposed ends of the forward accumulator valve (16) and the reverse accumulator valve (17) whose opposite ends are opened are coupled to each other, so that the accumulator having a substantially integrated structure is obtained. Although the device (13) is used, as shown in FIG. 5, the forward accumulator valve (33) and the reverse accumulator valve (34) having substantially the same shape as the above are independently manufactured separately. An accumulator device in which the closing plates (35) and (35) and the flanges (33a) and (34b) for closing the opening ends thereof are connected by screws (36) may be used.
[0035]
At this time, the compression coil springs (37) and (37) may be contracted between the opposing surfaces of the respective blocking plates (35) and the piston (21).
Of course, the forward accumulator valve (33) and the reverse accumulator valve (34) may be separated and provided in parallel with the hydraulic circuit downstream of the solenoid valve (12).
[0036]
The present invention can also be applied to a single forward clutch.
In this case, the solenoid valve (15) for continuous switching is not necessary.
[0037]
Further, when one clutch is turned on / off, only one accumulator valve may be used. In this case, a control valve that supplies pressure oil to the accumulator valve may be a solenoid valve that simply supplies and stops hydraulic pressure. .
[0038]
In the above embodiment, the second inlet port (27) communicates with the first inlet port (25) and the second outlet port (28) communicates with the first outlet port (26). The port (27) is connected to the circuit (29), and the second outlet port (28) of the forward accumulator valve (16) (33) is connected to the circuit (31) and the reverse accumulator valve (17) (34). Of course, the second outlet port (28) may be directly connected to the circuit (31).
[0039]
【The invention's effect】
According to the first aspect of the present invention, when the control valve is switched to turn on the clutch, immediately after that, the pressure oil flows through the first inlet port, the oil groove of the piston, and the first outlet port in the accumulator valve. Since the clutch is supplied to the clutch and the connection of the clutch is started, the clutch is not suddenly connected by the pressure oil pumped by the accumulator as in the prior art, and the shock at the start of the connection is alleviated.
[0040]
In addition, the pressure oil continues to flow into the oil chamber via the orifice-shaped second inlet port after the clutch connection is started, and the piston is pushed up against the urging means to gradually increase the oil chamber. Is supplied to the clutch through the second outlet port, and the clutch is completely connected.
[0041]
At this time, since the clutch has already been connected, the cross-sectional area of the orifice-like second inlet port can be made relatively large to allow the pressure oil to flow quickly into the oil chamber and to increase the moving speed of the piston. . As a result, it is possible to shorten the time required to connect the clutch, and the clutch can be switched quickly.
[0042]
According to the invention of claim 2, since the two accumulator valves are integrated, not only the number of parts can be reduced and the cost can be reduced, but also the accumulator valve can be downsized. Increases freedom.
[0043]
According to the third aspect of the present invention, the clutch can be switched quickly and electrically.
[0044]
According to the fourth aspect of the present invention, switching between the forward clutch and the reverse clutch can be performed smoothly and quickly by each accumulator valve.
[0045]
According to the fifth aspect of the present invention, the switching between the low speed clutch and the high speed clutch can be quickly performed with the shock reduced by merely operating the speed switching solenoid valve.
[Brief description of the drawings]
FIG. 1 is an overall hydraulic circuit of a torque converter with a transmission to which the present invention is applied.
FIG. 2 is a front view of the center of a forward accumulator valve and a reverse accumulator valve integrated in the same manner, and is an explanatory view showing a state in which pressure oil is supplied to the forward accumulator valve side.
FIG. 3 is a central longitudinal sectional front view showing an initial state in which pressure oil is supplied to the reverse accumulator valve.
FIG. 4 is a central longitudinal sectional front view showing a state where pressure oil is supplied from a second inlet port to a reverse accumulator valve and a piston is pressed.
FIG. 5 is a central longitudinal sectional front view showing a modified example of the accumulator valve, in which accumulator valves for back and forth traveling separately are coupled to each other.
[Explanation of symbols]
(1) Oil pump
(2) Oil pan
(3) Torque converter
(4) Transmission
(5) Main pressure regulator valve
(6) Regulator valve
(7) Line filter
(8) Low speed clutch
(9) High speed clutch
(10) Reverse clutch
(11) Main hydraulic circuit
(12) Solenoid valve for forward / reverse switching (control valve)
(13) Accumulator device
(14) Clutch switching valve device
(15) Speed switching solenoid valve
(16) Forward accumulator valve
(16a) Valve body
(16b) Flange
(17) Reverse accumulator valve
(17a) Valve body
(17b) Flange
(18) Guide hole
(19) Screw
(20) Oil groove
(21) Piston
(22) Compression coil spring (biasing means)
(23) Oil chamber
(24) Stopper shaft
(25) 1st entrance port
(26) 1st exit port
(27) Second entrance port
(28) Second exit port
(29) (30) (31) (32) Circuit
(33) Forward accumulator valve
(33a) Flange
(34) Reverse accumulator valve
(34a) Flange
(35) Blocking plate
(36) Screw
(37) Compression coil spring (biasing means)

Claims (5)

A clutch switching valve device which is provided between an oil pump and a clutch in a hydraulic circuit of a torque converter with a transmission and which turns on and off the clutch by supplying pressure oil from the oil pump to the clutch. A control valve that supplies pressure oil to the clutch is provided in the hydraulic circuit downstream of the oil pump, and the hydraulic circuit between the control valve and the clutch is slidably fitted in the cylindrical valve body. And a piston having an oil groove on the outer peripheral surface, an urging means for constantly urging the piston toward one side end of the valve body, and provided in the valve body, wherein the piston is located at one side end. The oil groove communicates with the oil groove on the outer peripheral surface, and the oil groove communicates with the discharge port of the control valve. A first inlet port and a first outlet port that allow pressure oil from the control valve to be supplied to the clutch, a side end surface of the piston opposite to the biasing means, and one side end in the valve body are formed. An orifice-shaped second inlet port that communicates with the oil chamber and introduces pressure oil from the control valve into the oil chamber, and also communicates with the oil chamber and supplies pressure oil discharged from the oil chamber to the clutch. A clutch switching valve device in a torque converter with a transmission, characterized in that an accumulator valve having a second outlet port is provided. The valve bodies of the two accumulator valves, each supplying pressure oil to different clutches, have a cylindrical shape with one open end, and these valve ends are joined together to connect the valve bodies together. 2. A clutch switching valve device in a torque converter with a transmission according to claim 1, wherein two accumulator valves are integrated by compressing a compression coil spring between opposing surfaces of the piston. 3. The clutch switching valve device in a torque converter with a transmission according to claim 1 or 2, wherein the control valve is a four-port, three-position switching type solenoid valve. 4. The first and second outlet ports of one accumulator valve are connected to the forward clutch, and the first and second outlet ports of the other accumulator valve are connected to the reverse clutch. A clutch switching valve device in a torque converter with a transmission. The hydraulic circuit connected to the first and second outlet ports of the accumulator valve is provided with a four-port, two-position switching solenoid valve for speed switching, and the forward hydraulic low speed clutch and the high speed are provided in the downstream hydraulic circuit. The clutch switching valve device in the torque converter with a transmission according to any one of claims 1 to 3, wherein a clutch is provided.

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