CN107882807A - A kind of synchronizer shift cylinder and its control method - Google Patents

Abstract

The invention discloses a synchronizer shift cylinder and a control method thereof. The synchronizer shift cylinder includes a cylinder body, an end cover, a piston and a piston rod; One end of the opening of the cylinder body is provided with an end cover, and a first thin-walled rectangular hole and a first throttle hole are opened on the end cover; a second thin-walled rectangular hole is opened on the side wall of the closed end of the cylinder body. a rectangular hole and a second orifice; the piston is slidably disposed in the cylinder, one end of the piston rod is fixed to the piston, and the other end passes through the side wall of the closed end of the cylinder , located outside the synchronizer shift cylinder. Through the above structure, the synchronizer shifting cylinder of the present invention reduces the shifting impact and shifting noise during the synchronizer shifting process, shortens the synchronization time, and improves the service life of the synchronizer.

Description

A synchronizer shift cylinder and its control method

technical field

The invention belongs to the technical field of automatic transmissions, in particular to a synchronizer shift cylinder and a control method thereof.

Background technique

The synchronizer shifting method is widely used in automatic transmissions, and the synchronizer shifting actuators include electric shift actuators, hydraulic shift actuators and pneumatic shift actuators. Pneumatic shifting has the advantages of low cost, quick shifting, and simple structure. Pneumatic shifting actuators are widely used in automatic transmissions equipped with synchronizers.

Pneumatic shifting has the disadvantages of high compressibility of compressed air, strong time lag and strong nonlinearity, and the controllability of the pneumatic shifting actuator is poor. When ensuring good shifting quality, the control algorithm is complex and difficult to control. During the gear shifting process of the synchronizer, the gear shifting impact and noise caused by the pneumatic gear shifting actuator are relatively large, which reduces the gear shifting quality, reduces the service life of the synchronizer, and even causes the synchronization function of the synchronizer to fail, resulting in "tooth hitting" Phenomenon. During the synchronization process of the synchronizer, the air intake cavity pressure boost process of the pneumatic gear shift actuator and the exhaust cavity depressurization process are slow, which increases the synchronization time of the synchronizer and the shift time of the synchronizer, and affects the shift quality.

Contents of the invention

The object of the present invention is to provide a synchronizer shift cylinder and its control method, aiming at the synchronizer shift mode, so as to overcome the deficiencies in the prior art.

The present invention solves the technical problem by adopting the following technical solutions: a synchronizer shift cylinder, which includes a cylinder body, an end cover, a piston and a piston rod;

The cylinder body is cylindrical with one end closed, and an end cover is provided at one end of the opening of the cylinder body, and a first thin-walled rectangular hole and a first throttle hole are opened on the end cover; A second thin-walled rectangular hole and a second throttle hole are opened on the side wall of the closed end of the body;

The piston is slidably arranged in the cylinder, one end of the piston rod is fixed to the piston, and the other end passes through the side wall of the closed end of the cylinder, and is located in the synchronizer shift cylinder of the exterior.

Optionally, the centerlines of the first thin-walled rectangular hole and the second thin-walled rectangular hole are located on the same straight line.

Optionally, both the first throttle hole and the second throttle hole are long straight round holes.

Optionally, the centerlines of the first throttle hole and the second throttle hole are located on the same straight line.

The present invention also adopts the following technical solution to solve the technical problem: a control method of a synchronizer shift cylinder, which is used to control the above-mentioned synchronizer shift cylinder, which includes a piston rod extension shift control process and a piston rod retraction shift control process control process;

Wherein, the piston rod stretches out the shift control process, including:

Step a: When the synchronizer shifting process starts, open the first orifice and pass in constant pressure compressed air, open the second orifice and open it to the atmosphere, close the first thin-walled rectangular hole and the second thin-walled rectangular hole;

Step b: When the synchronizer synchronization process starts, keep opening the first throttle hole and open the first thin-walled rectangular hole and pass in constant pressure compressed air, keep opening the second throttle hole and open the second thin-walled rectangular hole and open to the atmosphere;

Step c: At the end of the synchronization process of the synchronizer, keep the first orifice open and pass in constant pressure compressed air, keep the second orifice open and open to the atmosphere, close the first thin-walled rectangular hole and the second thin-walled rectangular hole wall rectangular hole;

Step d: At the end of the synchronizer shifting, the first throttle hole, the second throttle hole, the first thin-walled rectangular hole and the second thin-walled rectangular hole are connected to the atmosphere;

The piston rod retracts the shift control process, including:

Step e: When the synchronizer shifting process starts, open the second orifice and pass in constant pressure compressed air, open the first orifice and open it to the atmosphere, close the first thin-walled rectangular hole and the second thin-walled rectangular hole;

Step f: When the synchronizer synchronization process starts, keep opening the second throttle hole and open the second thin-walled rectangular hole and pass in constant pressure compressed air, keep opening the first throttle hole and open the first thin-walled rectangular hole and open to the atmosphere;

Step g: At the end of the synchronization process of the synchronizer, keep the first orifice open and pass compressed air of constant pressure, keep the second orifice open and open to the atmosphere, close the first thin-walled rectangular hole and the second thin-walled rectangular hole wall rectangular hole;

Step h: At the end of the gear shifting of the synchronizer, open the first throttle hole, the second throttle hole, the first thin-walled rectangular hole and the second thin-walled rectangular hole to the atmosphere.

Beneficial effect of the present invention:

1. The present invention reduces shifting impact and shifting noise during the shifting process of the synchronizer.

2. The present invention reduces the impact on the synchronizing ring of the synchronizer during the shifting process of the synchronizer, and improves the service life of the synchronizer.

3. The present invention shortens the synchronization time of the synchronizer and improves the shifting quality during the gear shifting process of the synchronizer.

Description of drawings

Fig. 1 is the structural principle diagram of the synchronizer shift cylinder of the present invention;

The marks in the figure are: 1-the first thin-walled rectangular hole; 2-the second thin-walled rectangular hole; 3-the second throttle hole; 4-the first throttle hole; 5-cylinder body; 6-end cover; 7-piston; 8-piston rod.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

Example 1

This embodiment provides a synchronizer shift cylinder, which includes a cylinder body, an end cover, a piston and a piston rod;

The cylinder body is cylindrical with one end closed, and an end cover is provided at one end of the opening of the cylinder body, and a first thin-walled rectangular hole 1 and a first throttle hole 4 are provided on the end cover; A second thin-walled rectangular hole 2 and a second throttle hole 3 are opened on the side wall of the closed end of the cylinder body.

The piston is slidably arranged in the cylinder, that is, the piston can move left and right along the axis of the cylinder, one end of the piston rod is fixed to the piston, and the other end passes through the cylinder The side wall of the closed end is located on the exterior of the synchronizer shift cylinder.

More preferably, the first thin-walled rectangular hole 1 and the second thin-walled rectangular hole 2 are symmetrically distributed at the rear end and front end of the synchronizer shift cylinder, and their center lines are on the same straight line. The first throttle hole 4 and the second throttle hole 3 are long straight round holes, respectively located at the rear end and the front end of the synchronizer shift cylinder, and their center lines are located on the same straight line.

This embodiment belongs to a single-rod double-acting cylinder, and the first thin-walled rectangular hole 1 and the first throttle hole 4 , as well as the second thin-walled rectangular hole 2 and the second throttle hole 3 can be used for intake and exhaust.

The working principle of the synchronizer shifting cylinder of the present invention is: when the synchronizer shifting begins, the compressed air in the intake chamber of the synchronizer shifting cylinder is inflated and boosted through the air intake orifice, and the exhaust chamber of the synchronizer shifting cylinder The gas is exhausted and pressurized through the exhaust orifice, and the piston of the synchronizer shift cylinder accelerates; before the synchronizer shift cylinder reaches the synchronous position, the piston of the synchronizer shift cylinder moves at a constant speed, and the synchronizer shifts gears The pressure of the compressed air in the intake chamber and exhaust chamber of the cylinder is stable; when the synchronization phase of the synchronizer starts, the compressed air in the intake chamber of the synchronizer shift cylinder is inflated and boosted through the intake throttle hole and the thin-walled rectangular hole. Rapidly rise to the air source pressure, the compressed air in the exhaust chamber of the synchronizer gear shifting cylinder is exhausted and depressurized through the exhaust orifice and quickly drops to atmospheric pressure, and the synchronizer performs the synchronization process under the action of the maximum shift force; when At the end of the synchronization process, the piston of the synchronizer shift cylinder starts to move, the intake chamber of the synchronizer shift cylinder is inflated through the intake orifice, and the gas in the exhaust chamber of the synchronizer shift cylinder is exhausted through the exhaust orifice. It acts as a buffer to reduce the impact and noise of the gear shift at the end of the synchronizer gear shift.

That is to say, through the above structure, the synchronizer shifting cylinder of the present invention reduces the shifting impact and shifting noise during the synchronizer shifting process, shortens the synchronization time, and improves the service life of the synchronizer.

Example 2

This embodiment provides a method for controlling a synchronizer shift cylinder, which includes the following steps:

The piston rod of this embodiment stretches out the shift control process:

Step a: When the synchronizer shifting process starts, open the first throttle hole 4 and pass in constant pressure compressed air, open the second throttle hole 3 and pass it to the atmosphere, close the first thin-walled rectangular hole 1 and the second Thin-walled rectangular hole2.

Step b: When the synchronizer synchronization process starts, keep opening the first throttle hole 4 and open the first thin-walled rectangular hole 1 and pass in constant pressure compressed air, keep opening the second throttle hole 3 and open the second thin-walled hole The rectangular hole 2 is connected to the atmosphere.

Step c: At the end of the synchronizing process of the synchronizer, keep the first throttle hole 4 open and pass in constant pressure compressed air, keep the second throttle hole 3 open and open to the atmosphere, close the first thin-walled rectangular hole 1 and Second thin-walled rectangular hole 2 .

Step d: When the synchronizer is shifted, the first throttle hole 4 , the second throttle hole 3 , the first thin-walled rectangular hole 1 and the second thin-walled rectangular hole 2 are connected to the atmosphere.

The piston rod retracts the shift control process of the present embodiment:

Step e: When the synchronizer shifting process starts, open the second throttle hole 3 and pass in constant pressure compressed air, open the first throttle hole 4 and pass it to the atmosphere, close the first thin-walled rectangular hole 1 and the second Thin-walled rectangular hole2.

Step f: When the synchronization process of the synchronizer starts, keep opening the second throttle hole 3 and open the second thin-walled rectangular hole 2 and pass in constant pressure compressed air, keep opening the first throttle hole 4 and open the first thin-walled rectangular hole The rectangular hole 1 is connected to the atmosphere.

Step g: At the end of the synchronizing process of the synchronizer, keep the first throttle hole 4 open and pass in constant pressure compressed air, keep the second throttle hole 3 open and open to the atmosphere, close the first thin-walled rectangular hole 1 and Second thin-walled rectangular hole 2 .

Step h: At the end of the gear shifting of the synchronizer, the first throttle hole 4 , the second throttle hole 3 , the first thin-walled rectangular hole 1 and the second thin-walled rectangular hole 2 are vented to the atmosphere.

The sequence of the above embodiments is only for convenience of description, and does not represent the advantages or disadvantages of the embodiments.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (5)

1. a kind of synchronizer shift cylinder, it is characterised in that including cylinder body, end cap, piston and piston rod；

The cylinder body is the cylindrical shape of one end closing, and end cap is provided with one end of the opening of the cylinder body, is opened on the end cap Provided with the first thin-wall rectangular hole and first segment discharge orifice；The second thin-walled square is offered in the side wall of one end of the closing of the cylinder body Shape hole and the second throttle orifice；

The piston is slidably disposed in the cylinder body, and the piston is fixed in one end of the piston rod, and the other end is worn The side wall of one end of the closing of the cylinder body is crossed, positioned at the outside of the synchronizer shift cylinder.

A kind of 2. synchronizer shift cylinder according to claim 1, it is characterised in that the first thin-wall rectangular hole and second thin The center line of wall rectangular opening is located on the same line.

3. a kind of synchronizer shift cylinder according to claim 1, it is characterised in that the first segment discharge orifice and the second section Discharge orifice is long straight circular hole.

4. a kind of synchronizer shift cylinder according to claim 1, it is characterised in that the first segment discharge orifice and the second section The center line of discharge orifice is located on the same line.

5. a kind of control method of synchronizer shift cylinder, for controlling synchronizer shift cylinder according to claim 1, It is characterised in that it includes piston rod stretches out gear-shifting control process and piston rod retraction gear-shifting control process；

Wherein, the piston rod stretches out gear-shifting control process, including：

Step a：When synchronizer shift process starts, open first segment discharge orifice and be simultaneously passed through the compressed air of constant pressure, open the Two throttle orifices simultaneously pass through air, close the first thin-wall rectangular hole and the second thin-wall rectangular hole；

Step b：When synchronizer synchronizing process starts, stay open first segment discharge orifice and open the first thin-wall rectangular hole and be passed through perseverance The compressed air of constant-pressure, stay open the second throttle orifice and open the second thin-wall rectangular hole and pass through air；

Step c：At the end of synchronizer synchronizing process, stay open first segment discharge orifice and be passed through the compressed air of constant pressure, Stay open the second throttle orifice and pass through air, close the first thin-wall rectangular hole and the second thin-wall rectangular hole；

Step d：At the end of synchronizer shift, by first segment discharge orifice, the second throttle orifice, the first thin-wall rectangular hole and the second thin-walled Rectangular opening passes through air；

The piston rod retraction gear-shifting control process, including：

Step e：When synchronizer shift process starts, open the second throttle orifice and be simultaneously passed through the compressed air of constant pressure, open the One throttle orifice simultaneously passes through air, closes the first thin-wall rectangular hole and the second thin-wall rectangular hole；

Step f：When synchronizer synchronizing process starts, stay open the second throttle orifice and open the second thin-wall rectangular hole and be passed through perseverance The compressed air of constant-pressure, stay open first segment discharge orifice and open the first thin-wall rectangular hole and pass through air；

Step g：At the end of synchronizer synchronizing process, stay open first segment discharge orifice and be passed through the compressed air of constant pressure, Stay open the second throttle orifice and pass through air, close the first thin-wall rectangular hole and the second thin-wall rectangular hole；

Step h：At the end of synchronizer shift, by first segment discharge orifice, the second throttle orifice, the first thin-wall rectangular hole and the second thin-walled Rectangular opening passes through air.