CN106949174B - Clutch master cylinder - Google Patents

Abstract

The invention discloses a clutch master cylinder, which comprises a cylinder body and a valve core assembly, wherein a master cylinder cavity, an upper cavity, a lower cavity and a medium conveying port are arranged in the cylinder body; the valve core assembly is arranged in the cylinder body in a sliding fit mode, an elastic return assembly is arranged between the valve core assembly and the cylinder body, the upper cavity and the lower cavity act on the valve core assembly, and the valve core assembly is provided with a medium inlet channel, a medium return channel and an isolation part which is located between the medium inlet channel and the medium return channel and used for disconnecting a passage between the main cylinder cavity and the medium conveying port in the moving process of the valve core assembly. When the clutch is engaged, the output pressure can be adjusted in a segmented manner, so that the engaging instantaneous speed of the clutch master and slave plates is low, and the clutch is not changed in other stages.

Description

clutch master cylinder

technical field

The invention relates to a clutch master cylinder, which belongs to the technical field of auto parts.

Background technique

At present, the clutch master cylinder is also called the clutch master cylinder. Its main function is to establish the pressure of the liquid in the clutch pipeline and transmit it to each clutch slave cylinder. The clutch slave cylinder generates thrust and pushes the separation fork to separate the master disc and the slave disc of the clutch. When the clutch is engaged, as the pedal retreats, the pressure of the clutch master cylinder decreases, the upper force of the release fork decreases, and the clutch is gradually engaged. However, at the moment of engagement, the clutch contact speed is too fast, which is prone to impact, and the engine stalls at the start stage .

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a clutch master cylinder, which can adjust the output pressure in sections when the clutch is engaged, so that the momentary speed of the clutch master-slave disc engagement is slow, and the clutch in other stages Engagement is unchanged.

In order to solve the above technical problems, the technical solution of the present invention is: a clutch master cylinder, which includes:

A cylinder body, the cylinder body is provided with a main cylinder chamber, an upper chamber, a lower chamber and a medium delivery port, the upper chamber communicates with the medium delivery port, and the lower chamber communicates with the master cylinder chamber;

A valve core assembly, the valve core assembly is slidingly fitted in the cylinder body, an elastic return assembly is arranged between the valve core assembly and the cylinder body, the upper chamber and the lower chamber act on the valve core assembly , the spool assembly is provided with an inlet medium passage, a return medium passage, and a media inlet channel located between the inlet medium passage and the return medium passage, which is used to disconnect the master cylinder chamber and the medium delivery port during the movement of the spool assembly. The isolation part of the passage between; when the pressure of the main cylinder chamber is greater than the pressure of the medium delivery port, and the valve core assembly is upward in the cylinder under the joint action of the pressure of the upper chamber, the pressure of the lower chamber and the elastic recovery assembly When the side of the chamber moves, the main cylinder chamber communicates with the medium delivery port through at least a part of the medium passage; when the pressure in the main cylinder chamber is lower than the pressure of the medium delivery port and the pressure of the valve core assembly is in the upper chamber, the lower chamber When the cylinder body moves to the lower chamber side under the joint action of the pressure of the pressure and the elastic recovery component, the master cylinder chamber communicates with the medium delivery port through at least a part of the return medium passage.

Further provide a specific structure of the valve core assembly, the valve core assembly has a valve core, an upper pusher connected to the upper end of the valve core and a lower pusher connected to the lower end of the valve core, the upper pusher and the upper cavity The medium in the lower pusher interacts with the medium in the lower cavity, and the medium inlet passage, the medium return passage and the isolation part are all arranged on the valve core.

A specific structure of the elastic return assembly is further provided, the elastic return assembly includes an upper spring sleeved on the valve core, one end of the upper spring is against the upper pusher, and the other end of the upper spring is in contact with the cylinder Body offset.

Further, the elastic return assembly further includes a lower spring sleeved on the valve core, one end of the lower spring is in contact with the lower pusher, and the other end of the lower spring is in contact with the cylinder body.

Further provided is a structure in which the medium delivery port communicates with the upper chamber, the cylinder body is provided with an upper chamber passage, and the medium delivery port communicates with the upper chamber through the upper chamber passage.

Further provided is a structure in which the main cylinder chamber communicates with the lower chamber, the cylinder body is provided with a lower chamber passage, and the master cylinder chamber communicates with the lower chamber through the lower chamber passage.

Further, the clutch master cylinder also includes a piston and a master cylinder push rod assembly, the master cylinder push rod assembly is connected to the piston, the piston extends into the master cylinder cavity, and the piston and the master cylinder cavity The media inside interact together.

Further, the cylinder body is also provided with a medium inlet port, and the medium inlet port is connected to or separated from the master cylinder chamber through a piston.

Further, a master cylinder head is installed on the cylinder body, and the push rod assembly of the master cylinder passes through the master cylinder head and is connected with the piston.

After adopting the above technical solution, the master cylinder push rod assembly pushes the piston to generate high pressure in the master cylinder cavity, and the pressure is transmitted to the lower cavity through the lower cavity channel. Since the upper cavity is connected with the medium delivery port, at this time, due to the upper cavity When the pressure is lower than the pressure in the lower cavity, the valve core moves upwards against the elastic force, and the medium inlet channel slowly opens, and the pressure enters the medium delivery port from the medium inlet channel, and then transmits to the clutch slave pump to generate thrust. When the pipeline pressure is balanced, the upper The pressure in the cavity and the lower cavity is equal, the valve core returns, at this time the inlet medium channel is closed, and the return medium channel is opened to a small part or not opened. When the clutch is engaged, the force of the clutch pedal is reduced, and the force of the push rod of the master cylinder is also reduced. The pressure of the master cylinder drops rapidly, and the pressure in the pipeline cannot pass through the spool to decrease with the pressure of the master cylinder. Therefore, the pressure in the upper chamber is greater than the pressure in the lower chamber, the spool starts to move down, the return medium channel is gradually opened, and the pressure of the clutch circuit gradually matches that of the main cylinder. The pressure in the cylinder chamber is equal, so that the engagement speed can be reduced when the clutch first engages, the impact generated when the clutch is engaged is reduced, and the clutch stability is improved.

Description of drawings

Fig. 1 is the structure schematic diagram that the clutch master cylinder of the present invention is in a balanced state;

Fig. 2 is a structural schematic diagram of the clutch master cylinder of the present invention in a state of entering medium;

Fig. 3 is a structural schematic diagram of the clutch master cylinder in the medium return state according to the present invention.

Detailed ways

In order to make the content of the present invention more clearly understood, the present invention will be further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

As shown in Figures 1 to 3, a clutch master cylinder includes:

Cylinder 3, the cylinder 3 is provided with a main cylinder chamber 31, an upper chamber 32, a lower chamber 33 and a medium delivery port 34, the upper chamber 32 communicates with the medium delivery port 34, and the lower chamber 33 communicates with the medium delivery port 34 The above-mentioned master cylinder cavity 31 is connected;

A spool assembly, the spool assembly is slidingly fitted in the cylinder body 3, an elastic recovery assembly is arranged between the spool assembly and the cylinder body 3, the upper cavity 32 and the lower cavity 33 act on the The spool assembly is provided with an inlet medium passage 51, a return medium passage 52, and is located between the inlet medium passage 51 and the return medium passage 52 and is used to disconnect the medium during the movement of the spool assembly. The isolation part of the passage between the master cylinder cavity 31 and the medium delivery port 34; When the pressure and the elastic recovery component move to the upper chamber 32 in the cylinder body 3, the master cylinder chamber 31 communicates with the medium delivery port 34 through at least a part of the medium passage 51; when the pressure of the master cylinder chamber 31 is less than the specified When the pressure of the medium delivery port 34 and the spool assembly moves to the lower chamber 33 side in the cylinder body 3 under the joint action of the pressure of the upper chamber 32, the pressure of the lower chamber 33 and the elastic recovery assembly, the master cylinder chamber 31 communicates with the medium delivery port 34 through at least a part of the return medium channel 52 .

As shown in Figures 1 to 3, the spool assembly has a spool 5, an upper pusher connected to the upper end of the spool 5 and a lower pusher connected to the lower end of the spool 5, the upper pusher and the upper cavity 32 The medium in the lower pusher interacts with the medium in the lower cavity 33 , and the medium-incoming channel 51 , the medium-returning channel 52 and the isolation part are all arranged on the valve core 5 .

As shown in Figures 1 to 3, the elastic return assembly includes an upper spring 61 sleeved on the valve core 5, one end of the upper spring 61 is against the upper pusher, and the other end of the upper spring 61 is in contact with the cylinder. Body 3 offsets.

As shown in Figures 1-3, the elastic return assembly also includes a lower spring 62 sleeved on the valve core 5, one end of the lower spring 62 is against the lower pusher, and the other end of the lower spring 62 is in contact with the lower pusher. Cylinder body 3 offsets.

As shown in FIGS. 1-3 , an upper chamber channel 35 is provided on the cylinder body 3 , and the medium delivery port 34 communicates with the upper chamber 32 through the upper chamber channel 35 .

As shown in FIGS. 1-3 , the cylinder body 3 is provided with a lower chamber passage 36 , and the master cylinder chamber 31 communicates with the lower chamber 33 through the lower chamber passage 36 .

As shown in Figures 1-3, the clutch master cylinder also includes a piston 4 and a master cylinder push rod assembly 1, the master cylinder push rod assembly 1 is connected to the piston 4, and the piston 4 extends into the master cylinder cavity 31 Inside, and the piston 4 interacts with the medium in the master cylinder cavity 31 .

As shown in FIGS. 1-3 , the cylinder body 3 is further provided with a medium inlet port 37 , and the medium inlet port 37 is connected to or separated from the master cylinder chamber 31 through the piston 4 .

As shown in FIGS. 1-3 , a master cylinder head 2 is mounted on the cylinder body 3 , and the master cylinder push rod assembly 1 is connected to the piston 4 after passing through the master cylinder head 2 .

The working principle of the present invention is as follows:

The clutch pedal is stepped on, and the master cylinder push rod assembly 1 moves forward. When the medium inlet port 37 is closed, the master cylinder chamber 31 starts to build up pressure, and the pressure is output through the return medium passage 52 and the lower chamber passage 36, because the diameter of the chamber passage 36 is larger than that of the return chamber. The effective passage of the medium passage 52, and the volume of the output object is different, so the pressure of the lower chamber is higher than the pressure of the upper chamber, the valve core 5 overcomes the spring force and moves upward, the return medium passage 52 is completely closed, the main inlet medium passage 51 is opened, and the main cylinder chamber 31 The pressure is output to the clutch cylinder to complete the separation of the clutch, as shown in Figure 2;

When the clutch pedal reaches the maximum stroke, the pressure in the master cylinder cavity 31 reaches the maximum, at this time the pressure on the left and right sides of the spool 5 is equal, the pressures in the upper cavity 32 and the lower cavity 33 are equal, and the spool 5 returns to the equilibrium position, as shown in Figure 1 .

When the clutch is engaged, the pedal force gradually decreases, the push rod assembly 1 of the master and master cylinder moves back after the force is reduced, the pressure of the medium delivery port 34 remains unchanged, the pressure of the master and master cylinder 31 decreases, and the pressure of the upper chamber 32 is equal to the pressure of the medium delivery port 34. The pressure of the lower chamber 33 is equal to that of the main cylinder 31, and the pressure of the upper chamber 32 is greater than that of the lower chamber 33. When the pressure difference between the pressure of the upper chamber 32 and the pressure of the lower chamber 33 is sufficient to overcome the spring force, the valve core 5 starts to move down. The return medium channel 52 is slowly opened, as shown in Figure 3, when the valve core 5 moves down to a certain extent, the return medium channel 52 is fully opened, the pressure on the left and right sides of the valve core 5 is equal, and the valve core 5 is reset. Full contact, the clutch pressure plate is quickly pressed firmly.

The specific embodiments described above have further described the technical problems, technical solutions and beneficial effects solved by the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (7)

1. A clutch master cylinder, characterized in that it comprises: cylinder (3), the cylinder (3) is provided with a main cylinder chamber (31), an upper chamber (32), a lower chamber (33) and a medium delivery port (34), the upper chamber (32) and The medium delivery port (34) is connected, and the lower chamber (33) is connected with the master cylinder chamber (31); A spool assembly, the spool assembly is slidingly fitted in the cylinder (3), an elastic recovery assembly is arranged between the spool assembly and the cylinder (3), the upper chamber (32) and the The lower chamber (33) acts on the valve core assembly, and the valve core assembly is provided with an inlet medium channel (51), a return medium channel (52) and a and is used to disconnect the passage between the master cylinder chamber (31) and the medium delivery port (34) during the movement of the spool assembly; when the pressure of the master cylinder chamber (31) is greater than the medium delivery port (34), and the spool assembly moves toward the upper chamber (32) side in the cylinder (3) under the joint action of the pressure of the upper chamber (32), the pressure of the lower chamber (33) and the elastic recovery assembly When moving, the master cylinder chamber (31) communicates with the medium delivery port (34) through at least a part of the medium passage (51); when the pressure of the master cylinder chamber (31) is less than the pressure of the medium delivery port (34) and When the spool assembly moves to the lower chamber (33) side in the cylinder body (3) under the joint action of the pressure of the upper chamber (32), the pressure of the lower chamber (33) and the elastic recovery assembly, the master cylinder chamber (31) communicate with the medium delivery port (34) through at least a part of the medium passage (52); It also includes a piston (4) and a master cylinder push rod assembly (1), the master cylinder push rod assembly (1) is connected to the piston (4), and the piston (4) extends into the master cylinder cavity (31 ), and the piston (4) interacts with the medium in the master cylinder chamber (31); The cylinder body (3) is provided with a lower chamber passage (36), and the master cylinder chamber (31) communicates with the lower chamber (33) through the lower chamber passage (36); The master cylinder push rod assembly pushes the piston to generate high pressure in the master cylinder cavity, and the pressure is transmitted to the lower cavity (33) through the lower cavity channel (36). 2. The clutch master cylinder according to claim 1, characterized in that: the spool assembly has a spool (5), an upper pusher connected to the upper end of the spool (5) and a lower end connected to the spool (5). The lower pusher, the upper pusher interacts with the medium in the upper cavity (32), the lower pusher interacts with the medium in the lower cavity (33), the medium inlet channel (51), the Both the return medium channel (52) and the isolation part are arranged on the valve core (5). 3. The clutch master cylinder according to claim 2, characterized in that: the elastic return assembly includes an upper spring (61) sleeved on the valve core (5), one end of the upper spring (61) is connected to The upper pusher is in contact with each other, and the other end of the upper spring (61) is in contact with the cylinder body (3). 4. The clutch master cylinder according to claim 2 or 3, characterized in that: the elastic return assembly further includes a lower spring (62) sleeved on the valve core (5), and the lower spring (62) One end of the lower spring (62) is in contact with the lower pusher, and the other end of the lower spring (62) is in contact with the cylinder body (3). 5. The clutch master cylinder according to claim 1, characterized in that: the cylinder body (3) is provided with an upper chamber passage (35), and the medium delivery port (34) passes through the upper chamber passage (35) ) communicates with the upper cavity (32). 6. The clutch master cylinder according to claim 1, characterized in that: the cylinder body (3) is also provided with a medium inlet port (37), and the medium inlet port (37) communicates with the piston (4) The main cylinder chambers (31) are connected or separated. 7. The clutch master cylinder according to claim 1, characterized in that: a master cylinder head (2) is mounted on the cylinder body (3), and the master cylinder push rod assembly (1) passes through the master cylinder The cover (2) is then connected to said piston (4).

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