Double-piston brake cylinder

Abstract

The double-piston brake cylinder comprises a cylinder body, the tail end of the cylinder body is an open end, the front end of the cylinder body is a closed end, a first piston assembly and a second piston assembly are arranged in an oil cavity of the cylinder body in a sliding mode, the first piston assembly is arranged close to the open end, and the second piston assembly is arranged close to the closed end. The first piston assembly comprises a first piston rod, a pre-tightening screw, a first piston spring and a spring limiting seat, the first piston rod comprises a main body section and an assembling section, the assembling section is arranged in the cylinder body, a guide sleeve is fixedly arranged at the opening end of the cylinder body, and a guide leather cup is embedded in the guide sleeve; the guide sleeve and the guide leather cup jointly define a guide hole coaxial with the oil cavity, the main body section is inserted into the guide hole in a penetrating mode and extends out of the cylinder body, and the outer diameter of the main body section is matched with the hole diameter of the guide hole. The double-piston brake cylinder is compact in structure, and the coaxiality of the pistons and the cylinder body is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of brake systems, and in particular relates to a double-piston brake cylinder. Background Art

[0002] The brake system is a crucial safety component in a vehicle, directly impacting driving safety. The brake cylinder is the most crucial component in the brake system. It connects to the vehicle's brake caliper. Brake fluid pumped from the cylinder activates the caliper, which then presses the friction pad and brake disc on the wheel to apply the brake force.

[0003] Conventional brake cylinders require two cylinder bodies, which control the front and rear wheel brakes respectively. However, the structure of such a two-cylinder brake cylinder is relatively complex and requires a large amount of assembly space. To solve this problem, a single-cylinder, dual-piston brake cylinder was designed. Two connected piston rods are separated into two independent oil chambers by a one-way leather cup, and the brake oil in the two oil chambers is controlled to be output from the corresponding oil outlets, respectively, for controlling the front and rear wheel brakes. However, in existing single-cylinder, dual-piston brake cylinders, both piston rods are built into the cylinder body, and an external push rod is required to push the piston rod to move within the cylinder body. To meet the piston movement stroke, the cylinder body is relatively long, resulting in the entire brake system requiring a large amount of assembly space and a less compact structure. In addition, in existing brake cylinders, the coaxiality between the piston rod and the cylinder body is poor during movement, and the leather cup will experience uneven wear, which affects the service life. Summary of the Invention

[0004] The utility model provides a double-piston brake cylinder to solve the problems in the prior art that the cylinder body of a single-cylinder double-piston brake cylinder is too long, the structure is not compact enough, and the coaxiality between the piston and the cylinder body is poor.

[0005] The purpose of the invention of this utility model is achieved through the following technical solutions:

[0006] A double-piston brake cylinder comprises a cylinder body, the tail end of which is an open end and the front end is a closed end, a first piston assembly and a second piston assembly are slidingly arranged in the oil chamber of the cylinder body, wherein the first piston assembly is arranged near the open end and the second piston assembly is arranged near the closed end; the first piston assembly comprises a first piston rod, a pre-tightening screw, a first piston spring and a spring limit seat, the first piston rod comprises a main body section and an assembly section, the assembly section is built into the interior of the cylinder body, a guide sleeve is fixedly provided at the open end of the cylinder body, a guide leather cup is embedded in the interior of the guide sleeve, the guide sleeve and the guide leather cup jointly define a guide hole coaxial with the oil chamber, the main body section is inserted in the guide hole and extends to the outside of the cylinder body, and the outer diameter of the main body section is adapted to the aperture of the guide hole.

[0007] Preferably, the spring limiting seat is fixed at the front end of the pre-tightening screw, the tail end of the pre-tightening screw is fixedly connected with the assembly section of the first piston rod, the first spring limiting sheet is fixed on the pre-tightening screw, one end of the first piston spring abuts against the first spring limiting sheet, and the other end of the first piston spring abuts against the spring limiting seat.

[0008] Preferably, the assembly section is sleeved with the first one-way leather cup, and the first one-way leather cup is limited behind the first spring limiting sheet.

[0009] Preferably, the second piston assembly comprises a second piston rod, a second spring limiting sheet and a second piston spring, the rear end of the second piston rod abuts against the spring seat, the rear end of the second piston rod is sleeved with a second one-way leather cup, and the front end of the second piston rod is sleeved with a third one-way leather cup.

[0010] Preferably, the first one-way leather cup and the second one-way leather cup are opposite in flow limiting direction, a first oil chamber is formed between the first one-way leather cup and the second one-way leather cup, and the first oil hole is arranged on the cylinder body and located behind the first one-way leather cup.

[0011] Preferably, the second one-way leather cup and the third one-way leather cup are opposite in flow limiting direction, the second piston rod and the cylinder body define an oil storage chamber, the oil storage chamber is located between the second one-way leather cup and the third one-way leather cup, and the second oil hole is arranged on the cylinder body and communicates with the oil storage chamber.

[0012] Preferably, the third one-way leather cup and the bottom of the oil cavity form a second oil chamber, the second piston rod is provided with an oil inlet hole, and the oil inlet hole is located behind the third one-way leather cup.

[0013] Preferably, the second piston rod is sleeved with the second spring limiting sheet, one end of the second piston spring abuts against the second spring limiting sheet, and the other end of the second piston spring abuts against the bottom of the oil cavity.

[0014] Preferably, the second piston rod is provided with an assembly groove for assembling the second one-way leather cup, and the third one-way leather cup is limited behind the second spring limiting sheet.

[0015] Preferably, the cylinder body is fixedly provided with a limiting screw, the top end of the limiting screw extends into the oil cavity and limits the sliding stroke of the second piston rod.

[0016] Compared with the prior art, the utility model have following beneficial effect: the main body section of second piston rod is outside in the cylinder body, can greatly reduce the length of cylinder body under the premise of piston stroke invariable, make the structure of whole brake cylinder more compact, and need not set up push rod again, reduce the assembly space of brake system, the setting of guide bush and guide leather bowl can guide the sliding of piston rod, effectively improve the coaxial degree of piston rod and cylinder body, avoid the eccentric wear of one -way leather bowl, prolong the service life of brake cylinder, spring limit piece structure and assembly position setting are reasonable not only to the spring limit, still can limit one -way leather bowl, simplify the component, assemble convenient. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is the utility model structural schematic diagram;

[0018] Fig. 2 It is the utility model first piston subassembly structure schematic diagram;

[0019] Fig. 3 It is the utility model second piston subassembly structure schematic diagram;

[0020] Mark in drawing: cylinder body 10;First oil injection hole 11;Second oil injection hole 12;First piston rod 21;Assembly section 211;Main body section 212;First piston spring 22;Pre-tightening screw 23;Spring limit seat 24;First spring limit piece 25;Second piston rod 31;Oil inlet 311;Second piston spring 32;Oil inlet 311;Second piston spring 32;Second spring limit piece 33;First one -way leather bowl 41;Second one -way leather bowl 42;Third one -way leather bowl 43;First oil chamber 51;Second oil chamber 52;Oil storage chamber 53;Guide bush 71;Guide leather bowl 72;Limit screw 80. DETAILED DESCRIPTION

[0021] The utility model will be further described in connection with the embodiment shown in the drawing:

[0022] As Figs. 1-3 Shown, this embodiment discloses a kind of double-piston brake cylinder, including cylinder body 10, its tail end is open end, front end is closed end, the oil cavity of the cylinder body 10 is slidably provided with first piston subassembly and second piston subassembly, wherein first piston subassembly is close to open end setting, second piston subassembly is close to closed end setting.

[0023] The first piston assembly comprises a first piston rod 21, a pre-tightening screw 23, a first piston spring 22 and a spring limiting seat 24, the first piston rod 21 comprises a main body section 212 and an assembly section 211, the assembly section 211 is arranged inside the cylinder body 10, the open end of the cylinder body 10 is fixedly provided with a guide sleeve 71, the inside of the guide sleeve 71 is embedded with a guide leather cup 72, the guide sleeve 71 and the guide leather cup 72 jointly define a guide hole coaxial with the oil cavity, the main body section 212 penetrates through the guide hole and extends to the outside of the cylinder body 10, and the outer diameter of the main body section 212 is matched with the hole diameter of the guide hole. The main body section 212 of the second piston rod 31 is arranged outside the cylinder body 10, which can greatly reduce the length of the cylinder body 10 under the premise of keeping the piston stroke unchanged, so that the structure of the whole brake cylinder is more compact, and a push rod does not need to be additionally arranged, thereby reducing the assembly space of the brake system; the arrangement of the guide sleeve 71 and the guide leather cup 72 can guide the sliding of the piston rod, effectively improve the coaxiality of the piston rod and the cylinder body 10, avoid the eccentric wear of the one-way leather cup, and prolong the service life of the brake cylinder.

[0024] The spring limiting seat 24 is fixedly arranged at the front end of the pre-tightening screw 23, the tail end of the pre-tightening screw 23 is fixedly connected with the assembly section 211 of the first piston rod 21, the first spring limiting piece 25 is fixedly arranged on the pre-tightening screw 23, one end of the first piston spring 22 abuts against the first spring limiting piece 25, and the other end of the first piston spring 22 abuts against the spring limiting seat 24; the assembly section 211 is sleeved with the first one-way leather cup 41, and the first one-way leather cup 41 is limited behind the first spring limiting piece 25. The spring limiting piece not only limits the spring, but also limits the one-way leather cup, thereby simplifying the components and facilitating assembly.

[0025] The second piston assembly comprises a second piston rod 31, a second spring limiting piece 33 and a second piston spring 32, the rear end of the second piston rod 31 abuts against the spring seat, the rear end of the second piston rod 31 is sleeved with the second one-way leather cup 42, and the front end of the second piston rod 31 is sleeved with the third one-way leather cup 43; the flow limiting directions of the first one-way leather cup 41 and the second one-way leather cup 42 are opposite, and the first one-way leather cup 41 and the second one-way leather cup 42 form the first oil chamber 51; the cylinder body 10 is provided with the first oil injection hole 11, the oil outlet end of the first oil injection hole 11 is located behind the first one-way leather cup 41, brake oil can enter the first oil chamber 51 through the first one-way leather cup 41 in one-way manner through the first oil injection hole 11, and the cylinder body 10 is further provided with the first oil outlet hole in communication with the first oil chamber 51.

[0026] The flow direction of the second one-way cup 42 is opposite to that of the third one-way cup 43, the second piston rod 31 and the cylinder body 10 define an oil storage chamber 53, which is located between the second one-way cup 42 and the third one-way cup 43, the second oil injection hole 12 is formed in the cylinder body 10 and communicates with the oil storage chamber 53; the third one-way cup 43 and the bottom of the oil cavity form a second oil chamber 52, the second piston rod 31 is provided with an oil inlet hole 311 located behind the third one-way cup 43, the brake oil in the oil storage chamber 53 can enter the second oil chamber 52 through the oil inlet hole 311 and the third one-way cup 43 in one-way, and the second oil outlet hole communicating with the second oil chamber 52 is also formed in the cylinder body 10.

[0027] The second piston rod 31 is sleeved with a second spring limiting piece 33, one end of the second piston spring 32 abuts against the second spring limiting piece 33, and the other end of the second piston spring 32 abuts against the bottom of the oil cavity; the second piston rod 31 is provided with an assembly groove for assembling the second one-way cup 42, and the third one-way cup 43 is limited behind the second spring limiting piece 33; the cylinder body 10 is fixed with a limiting screw 80, the top end of the limiting screw 80 extends into the oil cavity and limits the sliding stroke of the second piston rod 31.

[0028] The first oil chamber 51 and the second oil chamber 52 are filled with brake oil, when the first piston rod 21 and the second piston rod 31 are pushed forward by an external force, the volume of the first oil chamber 51 and the second oil chamber 52 decreases, and the brake oil in the first oil chamber 51 and the second oil chamber 52 is output from the first oil outlet hole and the second oil outlet hole respectively, and then is transmitted to the brake caliper through the oil pipe to drive the brake caliper to brake. After the external force is removed, the first piston rod 21 is reset under the action of the first piston spring 22, a negative pressure is generated in the first oil chamber 51, and the brake oil is supplied to the first oil chamber 51 through the first one-way cup 41 in one-way from the first oil injection hole 11; the second piston rod 31 is reset under the action of the second piston spring 32, a negative pressure is generated in the second oil chamber 52, and the brake oil in the oil storage chamber 53 is supplied to the second oil chamber 52 through the oil inlet hole 311 and the third one-way cup 43 in one-way.

[0029] It should be understood that, in the claims, the specification and the drawings of the utility model, all "include" should be understood as open meaning, that is, its meaning is equivalent to "at least contain", and should not be understood as closed meaning, that is, its meaning should not be understood as "only contain". The terms "first", "second" are only used for the purpose of description, and should not be understood as indicating or implying relative importance or implying the number of indicated technical features.

[0030] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any changes, modifications, additions or replacements made by those skilled in the art within the essential scope of the present application shall be covered within the protection scope of the present application.

Claims

1. A dual piston brake cylinder comprising a cylinder body, the tail end of which is an open end and the front end of which is a closed end, a first piston assembly and a second piston assembly being slidably arranged in the oil cavity of the cylinder body, wherein the first piston assembly is arranged close to the open end and the second piston assembly is arranged close to the closed end; characterized in that, The first piston assembly comprises a first piston rod, a pre-tightening screw, a first piston spring and a spring limiting seat, the first piston rod comprises a main body section and an assembly section, the assembly section is arranged inside the cylinder body, the open end of the cylinder body is fixedly provided with a guide sleeve, the inside of the guide sleeve is embedded with a guide leather cup, the guide sleeve and the guide leather cup jointly define a guide hole coaxial with the oil cavity, the main body section is inserted into the guide hole and extends to the outside of the cylinder body, and the outer diameter of the main body section is matched with the hole diameter of the guide hole.

2. A dual piston brake cylinder according to claim 1, characterized in that The spring limiting seat is fixedly arranged at the front end of the pre-tightening screw, the tail end of the pre-tightening screw is fixedly connected with the assembly section of the first piston rod, the first spring limiting piece is fixedly arranged on the pre-tightening screw, one end of the first piston spring is abutted against the first spring limiting piece, and the other end is abutted against the spring limiting seat.

3. A dual piston brake cylinder according to claim 2, characterized in that The assembly section is sleeved with the first one-way leather cup, and the first one-way leather cup is limited behind the first spring limiting piece.

4. A dual piston brake cylinder according to claim 3, characterized in that The second piston assembly comprises a second piston rod, a second spring limiting piece and a second piston spring, the rear end of the second piston rod is abutted against the spring limiting seat, the rear end of the second piston rod is sleeved with a second one-way leather cup, and the front end of the second piston rod is sleeved with a third one-way leather cup.

5. A dual piston brake cylinder according to claim 4, characterized in that The flow limiting directions of the first one-way leather cup and the second one-way leather cup are opposite, and a first oil chamber is formed between the first one-way leather cup and the second one-way leather cup; a first oil injection hole is arranged on the cylinder body, and the oil outlet end of the first oil injection hole is located behind the first one-way leather cup.

6. A dual piston brake cylinder according to claim 5, characterized in that The flow limiting directions of the second one-way leather cup and the third one-way leather cup are opposite, the second piston rod and the cylinder body define an oil storage chamber, the oil storage chamber is located between the second one-way leather cup and the third one-way leather cup, and a second oil injection hole is arranged on the cylinder body and communicates with the oil storage chamber.

7. A dual piston brake cylinder according to claim 6, characterized in that A second oil chamber is formed between the third one-way leather cup and the bottom of the oil cavity, and an oil inlet hole is arranged on the second piston rod and located behind the third one-way leather cup.

8. A dual piston brake cylinder according to claim 7, characterized in that The second spring limiting piece is sleeved on the second piston rod, one end of the second piston spring is abutted against the second spring limiting piece, and the other end is abutted against the bottom of the oil cavity.

9. A dual piston brake cylinder according to claim 8, characterized in that An assembly groove for assembling the second one-way leather cup is arranged on the second piston rod, and the third one-way leather cup is limited behind the second spring limiting piece.

10. A dual piston brake cylinder according to any one of claims 4-9, characterized in that A limiting screw is fixedly arranged on the cylinder body, the top end of the limiting screw extends into the oil cavity and limits the sliding stroke of the second piston rod.

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