JPH03255267A - Power shifting device - Google Patents

Abstract

PURPOSE:To miniaturize and compact the power shifting device for improving operability of a shift lever by adding auxiliary power to the shift lever by an actuator and by making the second surge tank and a check valve prevent the minus pressure acting on the actuator from becoming large. CONSTITUTION:The second surge tank 15 is provided between the first surge tank 11 and an actuator 1, and a check valve 16, a detection member 8 for detecting the operation position of a shift lever 7, and a control member 12 for receiving signals from the detection member 8 and for actuating solenoid valves 13 and 14 according to the signal are provided. A power shift device is constituted in such that by operating the actuator 1 according to the operation position of the shift lever 7, auxiliary power is added to the operation power of the shift lever 7, and in addition, the second surge tank 15 and check valve 14 prevent value of the minus pressure acting on the actuator 1 from becoming larger than the specified value.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a power shift device, and in particular, to the power shift device, which increases the operating force by adding an auxiliary force to the operating force of the shift lever by the driver, thereby improving operability. The present invention relates to a power shift device configured to

[Prior art and its problems]

Conventionally, transmissions in large trunks, large buses, etc. have been connected from the shift lever in the driver's seat via the front axle, rear-front axle, rear-rear axle, etc. There was a problem in that the shift lever's operability deteriorated due to the long distance between the shift lever and the transmission.

Therefore, in recent years, a so-called power shift device has been used which improves operability by adding an auxiliary force by aerodynamic force to the driver's force to operate the shift lever.

This power shift device uses an electric signal from a switch built into the shift lever to supply air to the air cylinder of the gear change shift unit installed in the transmission (transmission cylinder), and shifts using the air force at that time. The unit is activated to change gears within the transmission.

In this case, since the driver only needs the force required to switch the switch built into the shift lever, the operability of the shift lever can be significantly improved.

However, with the above configuration, a large capacity positive pressure type is required because a large output is required to operate the air cylinder of the shift unit installed in the transmission. A pressure supply device must be installed, and its arrangement requires extra space, and additional parts for operating the pressure supply device must also be provided, which increases the size of the entire device and complicates maintenance. It had problems such as becoming

Additionally, since the shift lever is not directly connected to the transmission, there is a problem in that if the device breaks down, the gear change operation within the transmission will no longer be possible. was.

This invention solves the problems of the conventional devices as described above, and is particularly suitable for large-capacity pressure supply devices by using the negative pressure of existing vacuum pumps, intake manifolds, etc. as a pressure supply source. The power shift device does not need to be installed, the entire device can be made smaller, maintenance is easier, and even if the device breaks down, the gear change operation within the transmission can be performed. The purpose is to provide

[Means for solving problems]

In order to solve the above problems, the present invention provides a power shift device provided on a shift lever that performs a switching operation of a combination of gears in a transmission, the power shift device comprising an actuator connected to the shift lever, ,
a pressure source supplying negative pressure to the actuator;
a solenoid valve that opens and closes a flow path from the pressure supply source to the actuator; a first surge tank provided between the pressure supply source and the solenoid valve;
a second surge tank provided between the first surge tank and the actuator, and a check valve;
The control member includes a detection member that detects the operating position of the shift lever, and a control member that receives a signal from the detection member and operates the solenoid valve in accordance with the signal, and controls the actuator according to the operating position of the shift lever. The second surge tank and the check valve add an auxiliary force to the operating force of the shift lever by activating the actuator, and the second surge tank and the check valve prevent the negative pressure acting on the actuator from becoming larger than a predetermined value. It adopted measures designed to prevent this.

(Operation) By employing the above means, the present invention has the advantage that when the driver operates the shift lever, negative pressure is supplied from the pressure supply source to the actuator according to the operating position of the shift lever, and this negative pressure When the actuator operates, an auxiliary force is added to the operating force of the shift lever, and therefore the operating force by the driver is increased and the shift lever is increased.
This will improve operability.

〔Example〕

Embodiments of the invention shown in the drawings will be described below.

FIG. 1 shows a schematic diagram of a power shift device according to the present invention, which includes an actuator 1, a pressure supply source 10, a first surge tank 11, and a second surge tank 15. and check valve 16,
It is composed of solenoid valves 13 and 14, a sensor 8 that is a detection member, and a controller 12 that is a control member.

The position sensor 8, which is the detection member, is provided on the shift lever 7 in the driver's cab, and the operating position of the shift lever 7 can be detected by the operation of the position sensor 8.

The actuator 1 is internally divided into two compartments, a first compartment 3 and a second compartment 4, by a diaphragm 2, and one end of a rod 5 is connected to the center of the diaphragm 2. The other end of the rod 5 projects outward from the actuator 1, and a link 6 is connected to the tip of the projecting portion.
The shift lever 7 is connected to the shift lever 7 via a cable 9.

The pressure supply source 10 generates negative pressure,
The first surge tank 11 and the second surge tank 15 are connected to this pressure supply source 10 to prevent fluctuations in the negative pressure generated from the pressure supply source 10.

Further, a check valve 16 is provided between the first surge tank 11 and the second surge tank 15, and the operation of the check valve 16 causes the second surge tank 15, that is, the negative voltage on the actuator 1 side. This allows the pressure to be maintained at a constant level.

Note that the pressure supply source IO is an intake manifold in the case of a gasoline engine, and a vacuum pump for brakes and clutches in the case of a diesel engine.

The solenoid valves 13, 14 are respectively provided between the first compartment 3 and the second surge tank 15 of the actuator 1 and between the second compartment 4 and the second surge tank 15, It opens and closes a flow path that supplies the negative pressure generated by the pressure supply source 10 into the first compartment 3 and the second compartment 4 of the actuator l, and connects the first compartment 3 and the second compartment 4. A three-boat solenoid valve 13 is connected to the second surge tank 15 via a pipe member 17, etc., and a third boat solenoid valve 13 is connected to the second compartment 4 and the second surge tank 15 via a pipe member 17, etc. A three-boat solenoid valve 14 is connected.

The controller 12 receives a signal from the body sensor 8 and operates the solenoid valve 13.14 in response to the signal. Negative pressure or atmospheric pressure is supplied to the first compartment 3 or the second compartment 4 of the actuator 1 .

In this way, the first compartment 3 and the second compartment 4 of the actuator 1 are connected to the solenoid valve 13.
By supplying negative pressure or atmospheric pressure via 14,
The rod 5 of the actuator 1 is moved in and out of the actuator 1, and the link 6 at the tip of the rod 5 is moved in accordance with the amount of movement of the rod 5 at that time! 8 as a fulcrum, and by the rotation of this link 6, an auxiliary force is applied to the shift lever 7 by the actuator 1.

Next, the effects of the above will be explained.

First, in FIG. 1, a case will be described in which the shift lever 7 is moved in the S direction by the driver's operation.

In FIG. 1, when the shift lever 7 is in the N position, both solenoid valves 13, 14 are inactive, the diaphragm 2 is in equilibrium in the actuator 1, and the rod 5 of the actuator l is in a state of equilibrium. Link 6
and a shift lever 7 connected via a cable 9.
is in a state where the output from the actuator 1 is not acting.

Next, when the driver operates the shift lever 7 to start moving in the S direction, the position sensor 8 that detects the slight movement of the shift lever 7 issues a signal to the controller 12, and this signal causes the controller 12 to Only the solenoid valve 13 on the first compartment 3 side of the actuator l is operated. At this time, the 3-port solenoid valves 14 of the four second compartments are inactive.

As a result, negative pressure is supplied into the first compartment 3 of the actuator 1 from the pressure supply source 10 via the first surge tank 11 and the second surge tank 15, and the second Atmospheric pressure is supplied to the compartment 4 through a solenoid valve 14.

Therefore, due to these actions, the actuator 1
The inner diaphragm 2 begins to deform in a direction that gradually pushes out the rod 53, and as a result, the link 6 at the tip of the rod 5 begins to rotate about the fulcrum 18.
This rotation of the link 6 acts as an auxiliary force on the shift lever 7 via the cable 9 connected to the link 6, thereby reducing the burden of the driver's own operating force.

In the above process, the first surge tank 11
If the internal pressure fluctuates, the second surge tank 15
By the action of the check valve 16 and the negative pressure supplied to the actuator 1, fluctuations can be prevented. Therefore, the negative pressure supplied to the first compartment 3, that is, the auxiliary force acting on the shift lever 7 can be prevented. can be kept constant.

The auxiliary force by the actuator 1 is applied until the shift lever 7 completely reaches the S position.

Next, a case will be described in which the driver operates the shift lever 7 to move it from the St position to the N position.

First, when the driver starts operating the shift lever 7 and the shift lever 7 starts to move from the S position to the N direction, the position sensor 8 detects the slight movement of the shift lever 7 and sends a signal to the controller 12. The controller 12 receives this signal and operates the solenoid valves 14 of the four second compartments of the actuator 1 according to the signal. At this time, the 3-port solenoid valves 13 of the three first compartments are in an inoperative state.

Therefore, in this state, negative pressure is supplied into the second compartment 4 of the actuator 1 from the pressure source 10 via the solenoid valve 14, and the diaphragm 2 in the actuator 1 retracts the rod 5. The driver starts to gradually deform the shift lever 7.
Since the actuator 1 can add an auxiliary force to the operating force of the shift lever 7, the driver's operating force of the shift lever 7 can be reduced.

In the above process, the first surge tank ll
If the internal pressure fluctuates, the second surge tank 15
By the action of the check valve 16 and the negative pressure supplied to the actuator 1, fluctuations can be prevented. Therefore, the negative pressure supplied to the actuator 1, that is, the auxiliary force acting on the shift lever 7 can be kept constant. will be possible.

The auxiliary force by the actuator 1 is applied until the shift lever 7 reaches the N position.

Then, while maintaining the above state, the shift lever 7 is moved to the first position.
When the shift lever 7 reaches the N position shown in the figure, the position sensor 8 detects the position of the shift lever 7, and the controller 12
When the controller 12 receives the signal, the controller 12 stops sending the signal to the solenoid valve 14, so that the solenoid valve 14 becomes inactive. At this time, the solenoid valve 13 on the first compartment 3 side of the actuator 1 is also inactive.

That is, in this state, the diaphragm 2 within the actuator 1 is in an equilibrium state, similar to the initial state,
The port 7 and 5 connected to the diaphragm 2 are in a state where no output is applied.

Next, move the shift lever 7 from the N position to the S position.

The case of moving to the position will be explained.

First, the driver starts operating the shift lever 7, and the shift lever 7 changes from the N position to the S! When the shift lever 7 starts to move in the direction of 14 is activated. At this time, the solenoid valve 13 on the side of the first compartment 3 is in an inoperative state.

Therefore, in this state, negative pressure is supplied from the pressure supply source 10 to the actuator via the solenoid valve 14, and the diaphragm 2 in the actuator 1 begins to deform in the direction of retracting the rod 5. As a result, the link 6 at the tip of the rod 5 starts rotating in the force direction S in the figure, using the fulcrum 18 as the fulcrum.

This rotation of the link 60 acts as an auxiliary force on the shift lever 7 via the cable 9, increasing the driver's operating force on the shift lever 7 and reducing the driver's own operating force. Become.

In the above process, the first surge tank 11
If the internal pressure fluctuates, the second surge tank 15
By the action of the check valve 16 and the negative pressure supplied to the actuator 1, fluctuations can be prevented. Therefore, the negative pressure supplied to the second compartment 4, that is, the auxiliary force acting on the shift lever 7 can be prevented. can be kept constant.

In this way, by operating the actuator 1 according to the operating position of the shift lever 7, it becomes possible to add an auxiliary force by the actuator 1 to the operating force of the driver, thus reducing the operating force of the driver. As a result, the operability of the shift lever 7 can be improved.

Moreover, in the above case, the pressure supply source 10 of the actuator l
In the case of a gasoline engine, the negative pressure of the intake manifold can be used, and in the case of a diesel engine, the negative pressure of the vacuum pump can be used. There is no need to provide a special pressure supply device for generating , and therefore the entire device can be downsized.

Furthermore, since the power shift device described above is used only as an auxiliary force to the driver's operating force, it is possible to perform a shift operation without using this device.
Therefore, even if the power shift device fails, the shift operation can be performed without any effect on the shift change of the transmission.

〔Effect of the invention〕

By configuring this invention as described above, it is possible to use the negative pressure of existing vacuum bombs, intake manifolds, etc., in addition to the conventional one that uses positive pressure. The device can be installed without changing the shift lever mechanism, and there is no need to install a device that generates positive pressure, so the entire device can be made smaller and more compact, and maintenance is also easier. It will become.

Also, this power shift device is only a shift lever.
Since it is provided as a mechanism to assist the operating force of the shift lever, the shift lever can originally be operated without using this device, so even if this power shift device breaks down, it will not affect the operation of the shift lever in any way. This means that the original function of the shift lever can be performed without causing any adverse effects.

Furthermore, since it is possible to add auxiliary force to the driver's operating force depending on the shift position of the shift lever, it is possible to reduce the burden on the driver's own operating force, and a double surge tank is installed. As a result, the supplied pressure can always be kept constant, which means that a constant amount of auxiliary force can always be given, which has the advantage of significantly improving the operability of the shift lever. It has the following effects.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a power shift device according to the present invention. l... Actuator 2... Diaphragm 3... First compartment 4... Second compartment 5... Rod 6. ...Link 7...Shift lever 8...Detection member (position sensor) 9...
... Cable lO ... Pressure supply source 11 ... First surge tank 12 ... Control member (controller) 13.1
4... Solenoid valve 15... Second
surge tank 16...check valve 17...pipe member 18...fulcrum

Claims (1)

[Claims] [1] A power shift device provided on a shift lever (7) that performs a switching operation of a combination of gears in a transmission, the power shift device comprising an actuator (1) connected to the shift lever (7); The actuator (
1); a pressure supply source (10) that supplies negative pressure to the actuator (1); solenoid valves (13) and (14) that open and close a flow path from the pressure supply source (10) to the actuator (1); source (10) and said solenoid valve (13)
, (14).
1), and a second surge tank (1) provided between the first surge tank (11) and the actuator (1).
15), a check valve (16), a detection member (8) that detects the operating position of the shift lever (7), and a detection member (8) that receives a signal from the detection member (8) and operates the solenoid valve according to the signal. (13) and (14), and operates the shift lever (7) by operating the actuator (1) according to the operating position of the shift lever (7). auxiliary force is added to the force, and the actuator (1)
A power shift device characterized in that the second surge tank (15) and the check valve (16) prevent negative pressure acting on the power from becoming larger than a predetermined value.