JPS61165053A - Method of speed change for transmission gear - Google Patents

Abstract

PURPOSE:To shorten the time necessary for speed change operation by bringing a shift valve into neutral position prior to switching of a changeover valve thereafter bringing the changeover valve to the switching position. CONSTITUTION:When changing from 1-speed to 2-speed, a hydraulic changeover valve 9 is left as it is while the shift valves 10, 11 are set respectively to the switching positions 10B, 11B. Upon finish of standby, said valve 9 is set to the switching position 9B. Consequently, a hydraulic changeover valve 3 is switched to the changeover position 3B to disengage a clutch 1 instantaneously through working oil pressure in a conduit 7a by means of an actuator 2. At the same time, pressure oil is fed to the shift valve 10, 11 to bring the shift lever to the position (nl) by means of a shift actuator 12.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of changing gears in a gear transmission in an automobile or the like.

[Prior Art] Conventionally, there are two types of clutches, dry type and wet type, which are interposed between the engine output shaft and the gear transmission input shaft in automobiles. Of these, wet type clutches are used in trucks that transmit large torque. Suitable for large items such as commercial use.

In addition, in these wet clutches that are configured to be automatically operated by an actuator, the clutch is engaged and disengaged by a spring attached to the clutch engaging the clutch when the actuator is released to the reservoir. When pressurized oil is supplied, an actuator pushes back the spring to disengage the clutch.

[Problems to be Solved by the Invention] In torque transmission in such conventional wet clutches, the torque transmission surface of the wet clutch has a smaller friction coefficient than that of the dry clutch, so the spring that keeps the clutch engaged is It is necessary to keep the auxiliary force considerably large, and therefore the spring is made considerably large.

However, making the spring large in this way also means making the clutch itself large, which is not desirable in terms of reducing the weight of the automobile.

Furthermore, along with the reduction in weight and size of the latch, the automatic gear shift operation on the gear transmission side must be completed within the shortest possible time, including the engagement and disengagement of the clutch.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic shift method for a gear transmission that can solve the above-mentioned problems and reduce the clutch's size and at the same time shorten the clutch's automatic shift time.

[Means for solving problems] The present invention has the following configuration.

The actuator that operates the clutch is in a state where pressure oil is being fed from the hydraulic source to the port of the actuator, and a: the pressure regulator increases the working oil pressure at the port, so that the clutch is controlled by the engine output. b: The pressure regulator is operated in a direction in which the input shaft of the gear transmission is engaged, and b: the pressure regulator is in a direction in which the engagement in the clutch is released by decreasing the working oil pressure in the port. The speed change operation in the shift direction of the gear transmission described in iif is operated by pressure oil supplied from the hydraulic pressure source to the shift valve and controlled by the shift valve, and the speed change operation in the shift direction is operated by: - In the gear transmission method described above, the gear transmission is shifted through a neutral position when shifting from the shift position to the next shift position.

A hydraulic switching valve interposed between the hydraulic source and the port is configured to: a: When the clutch enters a preparation stage for engaging the engine output shaft and the input shaft, the hydraulic switching valve connects the hydraulic source to the port; and close communication between the hydraulic power source and the shift valve.

b: When the shift valve enters the preparation stage for the shift operation, the shift valve is set to the neutral position for the shift, and after that setting, the hydraulic pressure source and the port are connected. The operation consists of closing the communication and opening the port to the reservoir, while simultaneously communicating the hydraulic pressure source to the shift valve.

1 action 1 The effects of the configuration of the present invention described above are as follows.

When transmitting power from the engine to the drive wheels via the engine output shaft, clutch, input shaft, and gear transmission, the hydraulic switching valve pumps the pressure oil in the hydraulic source to the actuator port, and shifts the hydraulic source and Communication with the valve is closed and the pressure regulator sets the operating pressure at the port to a sufficiently high pressure value so that the clutch is engaged and allows torque to be transmitted from the engine to the input shaft.

In this state where latch torque transmission is possible, when the gear transmission reaches a state where it should shift from the - shift position to the next shift position, the shift valve changes the shift position of the gear transmission to the next shift position. Set to the neutral position.

Note that in this state, as mentioned above, the hydraulic switching valve closes the communication between the hydraulic pressure source and the shift valve.
Pressure oil from the hydraulic source is not fed under pressure to the shift valve. Therefore, even if the shift valve is set to set the gear shift position to the neutral position of the gear shift as described above, the gear transmission will not be set to the neutral position of the gear shift, and the gear shift position will not be set to the neutral position of the gear shift. The machine remains set to the - gear shift position, and in this state, the hydraulic pressure switching valve still communicates the hydraulic pressure source with the port of the 7 actuator and maintains the working hydraulic pressure of this port at a high pressure state, so the clutch is in an engaged state, and continues to transmit power from the engine to the drive wheels.

In this situation, if the hydraulic switching valve closes communication between the hydraulic source and the port in the actuator and opens the port to the reservoir, while simultaneously communicating the hydraulic source to the shift valve, the following effects will occur.

The hydraulic switching valve closes communication between the hydraulic source and the port in the actuator and opens the port to the reservoir, thereby reducing the operating pressure of the port in the actuator to atmospheric pressure.

As a result, the clutch is instantly disengaged as the actuator port rapidly drops from high operating pressure to atmospheric pressure.

Moreover, at the same time, the hydraulic switching valve communicated the hydraulic source with the shift valve, so that the pressure oil in the hydraulic source was sent to the shift valve simultaneously with the disengagement of the clutch, and at this time, the shift valve had already changed the gear transmission. Since the gear transmission is set to the neutral position, the gear transmission is set to the neutral position at the same time that pressure oil is fed to the shift valve.

In other words, when the hydraulic switching valve is switched to shift the gear transmission, one of the switching operations causes the shift valve to change the gear transmission position from the negative shift position to the neutral position at the same time as the clutch is released. You will have to set it.

In addition, in order to complete all of the above-mentioned gear changes.

From the neutral position, the shift valve subsequently changes the gear position to the next gear position, or from the neutral position, the select valve next changes the select position for that gear shift, and shifts at the new selected position. This will cause the valve to shift to the next shift position.

When the gear shift in the gear transmission is completed in this way, the hydraulic switching valve is switched at the new shift position, thereby communicating the hydraulic source with the port of the 7-cut unit and closing the communication between the hydraulic source and the shift valve. As a result, the clutch is engaged and power from the engine is transmitted to the drive wheels again.

Note that after the above new shift position is set.

When the clutch is to be engaged again as described above, the pressure regulating device sets the working hydraulic pressure at the actuator port to the lowest pressure before the hydraulic switching valve is switched as described above. , after the hydraulic switching valve communicates the hydraulic pressure source with the port as described above, the pressure regulating device increases the working hydraulic pressure at the port, and the
The clutch engages smoothly as it rises.

[Example] Hereinafter, the present invention will be explained based on Examples.

FIG. 1 shows a system diagram of a clutch control device as an embodiment for using the automatic gear shifting method for a gear transmission according to the present invention.

In FIG. 1, a clutch l is interposed between an engine output shaft 1a and an input shaft 1b of a gear transmission (not shown),
The actuator 2 is actuated by the pressure difference between the hydraulic pressure in the displacement chamber 2a and the hydraulic pressure in the displacement chamber 2b, and when the hydraulic pressure in the displacement chamber 2a is higher than the hydraulic pressure in the displacement chamber 2b, the actuator 2 engages the clutch 1. When the torque from the engine output shaft 1a can be transmitted to the input shaft 1b via the clutch 1, and the working oil pressure in the displacement chamber 2a is lower than the working oil pressure in the displacement chamber 2b, the actuator 2 transfers the torque from the engine output shaft 1a to the input shaft 1b through the clutch 1. The clutch l is disengaged by hydraulic pressure on the side.

A pipeline 3a communicates with the port 2c in the displacement chamber 2a via a pipeline 5b, a hydraulic pump 5, a pipeline 5a, a hydraulic switching valve 9, a back pressure valve 8, and a hydraulic switching valve 3.
A pipe line 7a communicates with b, and the pipe line 7a is connected to the reservoir 5d via the back pressure valve 7, so the working oil pressure in the pipe line 7a is kept at a constant pressure depending on the set pressure in the back pressure valve 7. A throttle channel 7b communicating with the pipe 7a is a device for sprinkling the hydraulic fluid of the pipe 7a onto the clutch 1.

The pipe line 3a communicates with the reservoir 5d via the throttle channel 3d, and a pressure regulator 4 is interposed between the pipe line 5a and the pipe line 7a, and the pressure regulator 4 is connected to the vent circuit in the relief valve. It is configured to adjust the working oil pressure of the pipe line 5a by controlling the set pressure with a solenoid valve, and the control of the solenoid valve is controlled by the current value sent to the wiring 4a, and the operation relieved from the pressure regulator 4 is controlled. Pressure oil is supplied to the pipe 7a, and the relationship between the hydraulic pressure p in the pipe 5a and the current i in the wiring 4a is set to the relationship of the characteristic p5a in FIG. 2. Note that p7a in FIG. The hydraulic pressure of passage 7a is shown.

The hydraulic switching valve 3 is connected to a pyro-hydraulic pipe 3 that communicates with the pipe 7a.
b, the pilot 1 connected to the pipe 9a, and the oil pressure of the pipe 3C.
When the working pressure p5a of the pipe line 5a is equal to or higher than the point d in FIG. When the oil pressure in the pilot line 3C leading to the oil pressure above the point d sets the hydraulic pressure switching valve 3 to the switching position 3A, the oil pressure in the pyro-soto line 3C leads to the oil pressure below the point d. When this occurs, the oil pressure in the pilot pipe line 3b sets the oil pressure switching valve 3 to the switching position 3B.

A pipe line 9b from the hydraulic switching valve 9 communicates with shift valves 10 and 11, and select valves 13 and 1.
Shift actuator 12, which communicates with shift valves 10 and 11 through conduits shown in solid lines, is shown in an enlarged side view in FIG.

As shown in FIG. 3, the shift actuator 12 is fitted with a small diameter portion 12h of a small diameter cylinder 12d and a large diameter portion 12i of a large diameter cylinder 12e and a heavyweight stone 12g so as to be able to slide in the axial direction. The piston 12 is attached to the cylinder 12j bored in the piston 12g.
k is fitted to be able to slide in the axial direction, a rod 12a is fixed to the piston 12k, the rod 12a is connected to a shift lever (not shown) in a gear transmission, and a shift valve is installed in the displacement chamber 12b. A conduit from shift valve IO is in communication with the displacement chamber 12C.

Furthermore, the configuration of the select actuator 15 is exactly the same as that of the shift actuator 12, and the displacement chamber 15b is connected to the conduit from the select valve 14, and the pre-displacement chamber 15C is connected to the conduit from the select valve 13. The rod 15a is connected to a shift lever (not shown) in a gear transmission.

Further, the shift pattern of the shift lever in the gear transmission is as shown in FIG. 4, where Sh indicates the movement of the rod 12a in the shift direction, and se indicates the movement of the rod 1
5a in the select direction, R is the reverse gear shift position, l, 2.3.4 and 5 are the first forward gear position.
3 shows the shift positions of speed, second speed, third speed, fourth speed, and fifth speed.

In a state where pressure oil is led to the pipe line 9b, the relationship between the shift valves 10 and 11 and the shift actuator 12 is such that the shift valve 10 is set to the switching position 10B and the shift valve 11 is set to the switching position 11A. When the oil is in the piston 12, the pressure oil in the conduit 9b is fed to the displacement chamber 12c via the shift valve 10, and the displacement chamber 12b communicates with the reservoir 5d via the shift valve 11. The piston 12 is pushed to its upper end by the pressure oil being pumped, and the upper end position of the piston 12 is such that the rod 12a sets the shift lever to either R12 or 4 in the shift pattern shown in FIG. are in a relationship.

Conversely, when the shift valve 10 is set to the switching position 10A and the shift valve 11 is set to the switching position 11B in a state where pressure oil is guided to the pipe line 9b, the pipe line 9
Pressure oil in b is fed to the displacement chamber 12b via the shift valve 11, and the displacement chamber 12c is transferred to the displacement chamber 12c via the shift valve l.
The piston 12 is connected to the reservoir 5d via O.
The piston 12 is pushed to the lower end by the pressure oil being forced into the displacement chamber 12b, and the position of the lower end of the piston 12 is as follows.
In the shift pattern shown in FIG. 4, the rod 12a sets the shift lever to either the 1.3 or 5 shift position.

In the above state, the shift valve 10 is in the switching position 10B.
, and when the shift valve 11 is also set to the switching position lIB, the pressure oil in the pipe line 9b is forced into the displacement chamber 12c via the shift valve 10, and at the same time, the pressure oil in the pipe line 9b is also transferred to the shift valve 11. Therefore, in the shift actuator 12, the piston 12g is pushed by the difference in pressure receiving area until the side with a larger pressure receiving area abuts against the shoulder 12f by the hydraulic pressure of the displacement chamber 12c. The hydraulic pressure in the displacement chamber 12b on the side with a larger pressure receiving area is the piston 12k.
is pressed until it contacts the shoulder 12m, and the position of the piston 12 is set to the position shown in FIG. 1 or 3, which is the neutral position n1. in the shift direction Sh. R2
Alternatively, the relationship is such that it is set at any setting position of R3 (FIG. 4).

Similarly, the relationship between the select valves 13 and 14 and the select actuator 15 is the same as that of the shift valves IO and 11 and the shift actuator 12, so the select valve 13 is set to the switching position 13B. And when the select valve 14 is set to the switching position 14A, the rod 15a is moved to the left end by 3
09, that crotch? The position corresponds to setting the shift lever to the select position 1-H in FIG. 4, and when the select valve 13 is set to the switching position 13A and the select valve 14 is set to the switching position lit 4B,
When the rod 15a is set to the right end, the -7 setting position corresponds to setting the shift lever to the 5 to 4 select positions in FIG. 4, and the select valve 13 is at the switching position 13B.
, and when the select valve 14 is also set to the switching position 14B, the rod 15a is set to the intermediate position shown in FIG. The relationship is equivalent to setting the position.

The operation of the configuration of the embodiment of the present invention described above will be explained below.

In a normal driving state in which the vehicle is transmitting power to the drive wheels, the operation shown in FIG. 1 is as follows.

A command from a calculator (not shown) to the solenoid 9C in the hydraulic switching valve 9 sets the hydraulic switching valve 9 to the switching position 9A, and the current value i of the wiring 4a in the pressure regulator 4 is the lowest value in FIG. It is set to .

Therefore, in this state, the pipe line 5a and the pipe line 9a are in communication, and the working oil pressure in the pipe line 9a is also the highest oil pressure (hydraulic pressure above point d) of p5a in FIG. 3 is set to the switching position 3A by the hydraulic pressure of the pilot pipe 3C, and the pipe 9a is in communication with the pipe 3a via the back pressure valve 8 and the hydraulic pressure switching valve 3.

When the pipe line 5a communicates with the pipe line 3a via the back pressure valve 8 in this way, the pressure oil in the pipe line 5a, which has the highest pressure, flows into the displacement chamber 2a via the back pressure valve 8 and the pipe line 3a. The actuator 2 engages the clutch 1 and transfers the torque at the engine output shaft 1a to the input shaft ib.
It is in the state of being transmitted to.

However, in this case, since the clutch 1 is in the engaged state, there is no flow of pressure oil from the pipe line 3a to the displacement chamber 2a, but the pressure oil in the pipe line 5a is A flow is formed from the throttle channel 3d to the reservoir 5d via the pressure valve 8.

Therefore, the flow causes a pressure loss dp in the back pressure valve 8, and as a result, the characteristic p3a of the hydraulic pressure in the pipe line 3a changes to the characteristic p5a as shown in FIG.
The characteristic p3a is obtained by subtracting the pressure loss dp from .

Assuming that the current - shift position of the gear transmission shown in FIG. is set at the lower end in FIG. 1 or 3, and the rod 15a of the select actuator 15 is located at the left end.

Next, when the car increases its speed from the above state and the calculator determines that the next shift position to be set is the second gear, the following actions occur.

The calculator first calculates the solenoid 1 of the shift valve 10.
A signal is sent to shift valve 10 by that signal.
is set at switching position 10B. Furthermore, in this case, since the shift valve 11 has been in the first speed, the switching position remains set to ILB, so the piston 12k of the shift actuator 12 is moved to the neutral position shown (nl in FIG. 4). This means that the vehicle can be set to a neutral position (equivalent to a neutral position).

However, in this state, the hydraulic switching valve 9 is still set at the switching position of 9A, so the pipe line 9
Since the pressure oil from the conduit 5a is not sent to b, the rod 12a is held at the first speed position by a detent (not shown), but does not move to the nl position. Therefore, engine power is still being transmitted from the engine output shaft 1a to the input shaft 1b.
and sets the hydraulic switching valve 9 to the switching position 9B.

By completing the setting of the switching position 9B, the pipe line 9a is opened to the reservoir 5d, and as a result, the pilot pipe line 3
C is also opened to the atmosphere, the hydraulic switching valve 3 is switched to the switching position 3B, and the displacement chamber 2a is opened to the reservoir 5d via the port 2c, the pipe 3a and the hydraulic switching valve 3. Therefore, at this time, the 7 actuator 2 instantly disengages the clutch 1 by the hydraulic pressure in the conduit 7a.

At the same time, the setting of the hydraulic switching valve 9 to the switching position 9B is as follows.
Conduit 5a is communicated with conduit 9b, and the pressure oil in conduit 5a is forced to be sent to shift valves IO and 11 via hydraulic switching valve 9 and conduit 9b.

In this case, since the shift valves 10 and 11 are already prepared to set the rod 12a to the neutral position of the shift of n1 in FIG. 4 as described above, the conduit 9b
At the same time, the shift actuator 1
2 shifts the shift position of the shift lever to the neutral position nl.

That is, the clutch 1 is disengaged by the 1-operation signal in which the hydraulic switching valve 9 switches the switching position from 9A to 9B, and at the same time, the transmission has completed its operation from the 1st gear to the nl neutral position. .

When the above operation is completed, the computer sends a signal to the solenoid 14a to set the select valve 14 to the switching position 14B. Also, at this time, since the select valve 13 has already been set to the first speed switching position 13B as described above, by switching the select valve 14 to the switching position 14B, the rod 15a is moved as shown in FIG. Shifting to the intermediate position, the select position is shifted from the positions 1 to R in FIG. 4 to the select position 3 to 2.

That is, the fact that the rod 15a sets the shift lever to the select position 3 to 2 while the rod 12a sets the shift lever to the nl position as described above means that the shift position of the transmission is changed to the position shown in FIG. nl to n2 in
This means that it has been moved to the position of

Furthermore, when this state is completed, the computer
Send a signal to a to change the switching position of shift valve ll to II
Set to A. Further, at this time, since the switching position of the shift valve 10 remains set to IOB as described above, the rod 12a is moved from the shift lever to the switching position 11A of the shift valve 11.
is shifted from the neutral position n2 to the second speed position in FIG.

In such a shift operation, the pressure regulator 4 operates the operating pressure p5a of the pipe line 5a serving as the hydraulic pressure source as shown in FIG. In FIG. 6, which is as shown in FIG. 6 along with the elapsed time t, L indicates the shift position on the low gear ratio side of the first gear, and H indicates the shift position on the high gear ratio side of the second gear. , 0 indicates the neutral position corresponding to nl or n2, the transition from 81 to S2 indicates the transition from the first speed position to nl, the transition from 52 to S3 corresponds to the transition from n1 to n2, and s3 The transition from ~S4~S5~s6' means the transition from n2 to the second speed, and 84~S5 shows the action until the synchromesh meshes synchronously during gear shifting. As shown in Figure 5, the operating points P2, p3, p
4 and p5, the pressure regulator 4 lowers the hydraulic pressure being fed from the pipe line 5a to the pipe line 9b, and the shift actuator 12 weakens the operating force during gear shifting to prevent damage to the synchronizer. I have to.

After the above operation is completed, the computer sets the current value i of the wiring 4a in the pressure regulator 4 to be equal to or higher than ie in FIG.
Thereafter, the hydraulic switching valve 9 is set to the switching position 9A again.

Total sum 0^ha; Luu Su φ7 to 1 and defeat Q.

The pilot pipe line 3C communicates with the pipe line 5a, but as mentioned above, the operating pressure of the pipe line 5a is set below point d in FIG. 4, so the hydraulic switching valve 3 changes its switching position. It is still set to 3B.

From this state, the computer decreases the current value i of the wiring 4a, and when the current value i reaches 1=ie, the oil pressure of the pilot pipe 3c becomes pci at point d as shown in FIG. The hydraulic pressure in the pilot line 3C reaches the hydraulic pressure switching valve 3.
Switch to switching position 3A.

Due to this switching, the pipe line 9a communicates with the pipe line 3a, so a working pressure is generated in the pipe line 3a, and its value becomes the characteristic of p3a between 1=o-Ie in FIG. As the current value i of the wiring 4a is decreased and reaches i<ic, as shown in FIG. Then, the actuator 2 engages the clutch 1, and when the hydraulic pressure in the pipe 3a reaches the maximum value, the engagement of the clutch 1 is completed and power is no longer transmitted from the engine to the drive wheels. It will be restarted.

In FIG. 2, region C indicates the range in which the actuator 2 engages the clutch l, and region C indicates the range in which the actuator 2 disengages the clutch l.

In contrast to the above-mentioned upshifting, downshifting from 2nd speed to 1st speed follows the opposite operation to the above operation, and operations from other shift positions to the next other shift positions are also performed. A similar operation will be performed.

In the above embodiment, the hydraulic switching valve 9 is connected to the pressure regulator 4.
However, the pressure regulator 4 and the back pressure valve 8 are kept in communication with each other, and the hydraulic switching valve 9 is connected to the discharge pipe of the hydraulic pump 5 as shown in FIG. The pressure regulator 4 may be interposed between the pressure regulator 4 and the pressure regulator 4.

However, in the case of Fig. 7, the hydraulic switching valve 9 is in the switching position 9B.
Since the discharge line of the hydraulic pump 5 must be set to a predetermined oil pressure when the hydraulic pressure is set to 1, it is necessary to provide a relief valve 16 in the discharge line of the hydraulic pump 5.

Note that the other parts in FIG. 7 have the same configuration as in FIG. 1.

Furthermore, in the configuration shown in FIG. 1, the pipe line 7a exists as a hydraulic pipe line for disengaging the clutch 1;
is not necessarily necessary, because when the actuator 2 should disengage the clutch l due to a decrease in the working oil pressure of the conduit 3a, the clutch 1 may be disengaged by the urging force of a spring placed inside the actuator 2. be.

In this case, the characteristic of p3a does not require consideration of providing a region b in FIG. 2, which has a lower pressure characteristic than p7a, as a range in which the clutch 1 is disengaged. Therefore, the back pressure valve 8 provided because the working pressure in the pipe line 3a becomes lower than the working pressure in the pipe line 7a in the region b becomes unnecessary.

Further, the hydraulic switching valve 3 shown in FIG. 1 is not necessarily required, but the hydraulic switching valve 3 ensures that the clutch 1 is in a disengaged state by ensuring that the pipe line 3a is opened to the atmosphere. This is provided to maintain the
It is sufficient that the characteristic of p7a is sufficiently lower than the characteristic of p7a, and that a sufficient area of disengagement of the clutch 1 is secured. is operated by two shift valves, the shift valve IO and the shift valve 11, but these may be configured as a regular shift valve.

[Effects of the Invention] As is clear from the above description, the effects of the present invention are as follows.

1) Discharge replacement valve-II of the hydraulic pump 5 serving as the hydraulic pressure source
+) Ku 7 Fist - Knee 9 /7'l J
-L') C, -7 A hydraulic switching valve 9 is interposed between the foot valves 10 and 11, and immediately before the hydraulic switching valve 9 is switched to the switching position 9B, the shift valve is used to shift the gear transmission. The gear position is set to the neutral position of gear shifting, and after that setting, the hydraulic switching valve 9 is switched to the switching position 9B, so that the gear shifting is performed using a single operation signal to switch the hydraulic switching valve 9. As a result, it is possible to complete the disengagement of the clutch 1 and the shift operation from the - shift position to the neutral shift position in the transmission.

This makes it possible to shorten the time required for the shift operation and at the same time simplify the control of the shift operation.

2) The reason why we decided to engage the clutch when the high pressure oil from the hydraulic source is fed to the actuator 2 is that in order to engage the clutch l using the high hydraulic pressure, the clutch is engaged using a large spring like in the past. This eliminates the need to supply pressure oil to the shift valve, making it possible to downsize the actuator 2. In addition, when engaging the clutch 1, there is no need to supply pressure oil to the shift valve. When it is necessary, the pressure oil supply to the actuator 2 becomes unnecessary as soon as the supply starts.

This means that the pressure oil in the hydraulic source is always used independently for each operation of the clutch l or gear change operation, and the use of pressure oil in the hydraulic source is distributed. This makes it possible to effectively utilize the gears for each operation and improve the responsiveness of the gearshift operation.

[Brief explanation of the drawing]

FIG. 1 shows a system diagram of a gear transmission gear transmission for using the gear transmission transmission method of the present invention, and FIG. 2 shows the operation in conduits 5a, 3a, and 7a. FIG. 3 shows an enlarged view of the shift actuator 12 in FIG. 1, and FIG.
The figure shows a shift pattern in the shift lever of a gear transmission, FIG. 5 shows a change in oil pressure in the conduit 5a (FIG. 1) during a shift, and FIG. 6 shows the shift position of the shift lever during a shift. Fig. 7 shows another example compared to Fig. 1. The symbols used in the example are as follows: 1: clutch, 1a: engine output shaft, 1b: gear transmission input shaft, 2: 7 actuator, 2C: port, 4: pressure regulator, 5: hydraulic pump, 5a: pipe line, 9: hydraulic switching valve, 10
and 11: shift valve, 12: shift actuator. Patent applicant Sanwa Seiki Co., Ltd. Representative Etsushi Nishikai Figure 2

Claims (1)

[Scope of Claims] 1. In a state in which the actuator that operates the clutch is pressurized oil from a hydraulic source to a port of the actuator, a: a pressure regulator increases the working hydraulic pressure at the port; (b) The pressure regulator operates the clutch in a direction in which the engine output shaft and the input shaft of the gear transmission engage with each other, and b: The pressure regulator lowers the working oil pressure at the port, so that the clutch The gear transmission is operated in the direction of disengaging the engagement, and the shift operation in the shift direction of the gear transmission is operated by pressure oil supplied from the hydraulic pressure source to the shift valve and controlled by the shift valve; A gear shift operation in the shift direction is performed when moving from one gear shift position to the next gear shift position.
In the above gear transmission method for shifting through a neutral position, the hydraulic switching valve interposed between the hydraulic source and the port includes: a: the clutch is connected to the engine output shaft; and when entering a preparatory stage for engaging the input shaft, the hydraulic power source is communicated with the port, and communication between the hydraulic power source and the shift valve is closed; b: the shift valve performs the gear shifting operation; When entering the preparation stage, the shift valve is set to a neutral position for the gear shift, and after that setting, communication between the hydraulic pressure source and the port is closed and the port is opened to a reservoir. , simultaneously communicating the hydraulic pressure source to the shift valve, a gear transmission method comprising the above operations.