Parking braking device and engineering machinery

Abstract

The utility model belongs to the technical field of parking braking, and discloses a parking braking device and engineering machinery, the parking braking device comprises a shell assembly, a friction pair, a piston, a spring, a connecting piece and a sealing plug, and an oil duct is arranged in the shell assembly; the friction pair, the piston and the spring are all arranged in the shell assembly, when hydraulic oil is introduced into the oil duct, the piston is switched to be in a braking release state, and when hydraulic oil is stopped from being introduced into the oil duct, the piston is switched to be in a braking state; a through hole is formed in the wall body of the shell assembly, one end of the connecting piece is fixedly connected with the piston, and the other end of the connecting piece is aligned to the through hole in the movement direction of the piston. The sealing plug is detachably sealed in the through hole and does not make contact with the connecting piece. The through hole is sealed through the sealing plug, dust and impurities are prevented from entering the shell assembly from the through hole, the connecting piece and the sealing plug are arranged in a separated mode, the sealing plug is prevented from being rubbed by the connecting piece, and the service life of the sealing plug is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of parking brakes, in particular to a parking brake device and engineering machinery. Background Art

[0002] The drive axles of some engineering machinery, such as lifting and transporting machinery, metallurgical equipment, mining equipment, and construction machinery, are usually provided with brakes, which are used to decelerate, stop, or maintain a stopped state.

[0003] In current brakes, an oil chamber is formed between the piston and the cylinder housing. Before hydraulic oil is input into the oil chamber, the spring pushes the piston toward the friction pair, and the piston squeezes the friction pair, causing sliding friction or combination between the friction plate in the friction pair and the dual steel plate to achieve braking. When hydraulic oil is input into the oil chamber, the hydraulic oil pushes the piston away from the friction pair, releasing the brake.

[0004] When the hydraulic system cannot provide hydraulic oil normally, the piston always squeezes the friction pair and the brake cannot be released by hydraulic oil. In order to solve this problem, a through hole is usually opened on the cylinder housing, and a transmission component is set on the piston. The transmission component passes through the through hole. The transmission component is manually pulled to one end outside the through hole to forcibly move the piston away from the friction pair, thereby releasing the brake to facilitate the movement of the construction machinery. At the same time, an O-ring is used to seal the gap between the transmission component and the through hole to prevent dust, impurities or water vapor and foreign matter from entering the interior of the brake.

[0005] However, the piston is a reciprocating moving part. When the transmission part moves back and forth with the piston, sliding friction is generated between the transmission part and the O-ring. The O-ring is prone to wear and failure and has a short service life, which affects the sealing of the brake and makes the brake prone to failure. Utility Model Content

[0006] The purpose of the utility model is to provide a parking brake device and engineering machinery, use a sealing plug to seal the through hole to prevent dust and impurities from entering the interior of the shell component through the through hole, separate the connecting piece from the sealing plug to prevent the sealing plug from being rubbed by the connecting piece, and extend the service life of the sealing plug.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] In a first aspect, a parking brake device is provided, comprising:

[0009] a housing assembly having an oil passage therein;

[0010] The friction pair, the piston and the spring are all arranged inside the housing assembly. The spring is used to elastically drive the piston toward the friction pair. The piston can switch between a braking state of pressing the friction pair and a braking release state away from the friction pair. When the hydraulic oil flows into the oil passage, the piston switches to the braking release state. When the hydraulic oil stops flowing into the oil passage, the piston switches to the braking state.

[0011] A connecting piece, wherein the wall of the housing assembly is provided with a through hole, one end of the connecting piece is fixedly connected to the piston, and the other end of the connecting piece is aligned with the through hole along the movement direction of the piston;

[0012] The sealing plug is detachably sealed on the through hole, and the sealing plug and the connecting piece are not in contact with each other.

[0013] As an optional technical solution, the inner wall of the through hole is provided with an internal thread, the outer wall of the sealing plug is provided with an external thread, and the sealing plug is threadedly connected to the through hole;

[0014] Alternatively, the inner wall of the through hole is provided with a slot, the outer wall of the sealing plug is provided with a buckle, the buckle is engaged with the slot, and the inner wall of the through hole is in close contact with the outer wall of the sealing plug;

[0015] Alternatively, the sealing plug is made of an elastic material, and one end of the sealing plug is elastically compressed in the through hole.

[0016] As an optional technical solution, a avoidance cavity is provided inside the sealing plug, and the avoidance cavity extends along the movement direction of the piston, and the avoidance cavity is used to avoid the connecting piece.

[0017] As an optional technical solution, one end of the connecting member away from the piston passes through the through hole and extends to the outside of the housing assembly.

[0018] As an optional technical solution, the connecting member is a bolt, one end of the bolt is threadedly connected to the piston, and the other end of the bolt passes through the through hole and extends to the outside of the housing assembly.

[0019] As an optional technical solution, the connecting parts are provided in plurality, and the connecting parts are arranged at equal intervals around the central axis of the piston, the housing assembly is provided with a plurality of through holes, the connecting parts correspond one-to-one to the through holes, and each of the through holes is provided with a sealing plug.

[0020] As an optional technical solution, the housing assembly includes:

[0021] A support, wherein the friction pair is arranged on the support;

[0022] A housing is detachably mounted on the support, and the piston is disposed on the housing;

[0023] The cover body is detachably mounted on the housing, the spring is located between the cover body and the piston, and the through hole is opened in the cover body.

[0024] As an optional technical solution, the spring is a butterfly spring.

[0025] As an optional technical solution, the oil passage is opened in the shell.

[0026] In a second aspect, an engineering machinery is provided, which includes the parking brake device as described above, and the parking brake device also includes two sealing rings, both of which are sealed between the inner wall of the housing assembly and the outer wall of the piston, one of the sealing rings is located below the oil passage, and the other sealing ring is located below the oil passage.

[0027] The beneficial effects of the utility model are:

[0028] The utility model provides a parking brake device and engineering machinery. The parking brake device includes a housing assembly, a friction pair, a piston, a spring, a connecting piece and a sealing plug. The parking brake device of the utility model is a normally closed brake device. When the oil passage does not input hydraulic oil, the spring elastically drives the piston to press against the friction pair. At this time, the parking brake device brakes. When the oil passage inputs hydraulic oil, the hydraulic oil pushes the piston away from the friction pair. At this time, the parking brake device releases the brake. When the oil passage cannot normally input hydraulic oil, the sealing plug is removed, and the piston is pulled away from the friction pair through the connecting piece, so that the piston is separated from the friction pair and the brake is forcibly released. In the utility model, the through hole is detachably sealed and provided with a sealing plug, which can prevent dust impurities or water vapor foreign matter from passing through the through hole into the interior of the housing assembly, and the sealing plug and the connecting piece do not contact each other, and the sealing plug is not subjected to the friction of the connecting piece, thereby extending the service life of the sealing plug and ensuring the sealing performance of the sealing plug. When the oil passage cannot normally supply oil, the sealing plug can be removed to pull the connecting piece and the brake is forcibly released. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The utility model is further described in detail below according to the accompanying drawings and embodiments;

[0030] Figure 1 It is a cross-sectional view of the parking brake device described in the embodiment.

[0031] In the figure:

[0032] 11. support; 12. housing; 121. oil passage; 13. cover; 131. through hole;

[0033] 2. Friction pair;

[0034] 3. Piston;

[0035] 4. Spring;

[0036] 5. Connectors;

[0037] 6. Sealing plug; 61. Avoidance cavity;

[0038] 7. Sealing ring. DETAILED DESCRIPTION

[0039] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0043] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0044] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0045] like Figure 1 As shown, the present embodiment provides a parking brake device, which includes a housing assembly, a friction pair 2, a piston 3, a spring 4, a connector 5 and a sealing plug 6. An oil passage 121 is provided inside the housing assembly; the friction pair 2, the piston 3 and the spring 4 are all arranged inside the housing assembly, the spring 4 is used to elastically drive the piston 3 toward the friction pair 2, and the piston 3 can switch between a braking state of pressing the friction pair 2 and a brake-released state away from the friction pair 2. When hydraulic oil is passed into the oil passage 121, the piston 3 switches to a brake-released state, and when the hydraulic oil stops passing into the oil passage 121, the piston 3 switches to a braking state; a through hole 131 is provided on the wall of the housing assembly, one end of the connector 5 is fixedly connected to the piston 3, and the other end of the connector 5 is aligned with the through hole 131 along the movement direction of the piston 3; the sealing plug 6 is detachably sealed in the through hole 131, and the sealing plug 6 and the connector 5 do not contact each other.

[0046] Specifically, the parking brake device of this embodiment is a normally closed brake device. When the oil passage 121 does not input hydraulic oil, the spring 4 elastically drives the piston 3 to press against the friction pair 2, and the parking brake device brakes at this time. When the oil passage 121 inputs hydraulic oil, the hydraulic oil pushes the piston 3 away from the friction pair 2, and the parking brake device releases the brake at this time. When the oil passage 121 cannot normally input hydraulic oil, the sealing plug 6 is removed, and the piston 3 is pulled away from the friction pair 2 through the connecting member 5, so that the piston 3 is separated from the friction pair 2, and the brake is forcibly released. In this embodiment, the through hole 131 is detachably sealed and provided with a sealing plug 6, which can prevent dust impurities or water vapor foreign matter from passing through the through hole 131 into the interior of the housing assembly, and the sealing plug 6 and the connecting member 5 do not contact each other, and the sealing plug 6 is not subjected to the friction of the connecting member 5, thereby extending the service life of the sealing plug 6 and ensuring the sealing performance of the sealing plug 6. When the oil passage 121 cannot normally supply oil, the sealing plug 6 can be removed to pull the connecting member 5, and the brake is forcibly released.

[0047] In this embodiment, the piston 3 is located between the spring 4 and the friction pair 2, and the spring 4 always has the elastic potential energy to push the piston 3 toward the friction pair 2. When the piston 3 is away from the friction pair 2, the spring 4 is further compressed, and the elastic potential energy of the spring 4 is further enhanced. In other embodiments, the spring 4 always has the elastic potential energy to pull the piston 3 toward the friction pair 2. When the piston 3 is away from the friction pair 2, the spring 4 is further stretched, and the elastic potential energy of the spring 4 is further enhanced.

[0048] In this embodiment, the inner wall of the through hole 131 is provided with an internal thread, the outer wall of the sealing plug 6 is provided with an external thread, and the sealing plug 6 is threadedly connected to the through hole 131. The sealing plug 6 is sealed to the through hole 131 by a threaded connection, which can ensure the sealing of the through hole 131, and the sealing plug 6 is more convenient to disassemble and install.

[0049] In some other embodiments, the inner wall of the through hole 131 is provided with a slot, and the outer wall of the sealing plug 6 is provided with a buckle, which is engaged with the slot, and the inner wall of the through hole 131 is in tight contact with the outer wall of the sealing plug 6 .

[0050] In some other embodiments, the sealing plug 6 is made of elastic material, and one end of the sealing plug 6 is elastically compressed in the through hole 131 .

[0051] Optionally, an avoidance chamber 61 is provided inside the sealing plug 6 . The avoidance chamber 61 extends along the movement direction of the piston 3 , and the avoidance chamber 61 is used to avoid the connecting piece 5 .

[0052] When the connecting member 5 moves with the piston 3 , the avoidance chamber 61 avoids the connecting member 5 , the connecting member 5 cannot touch the inner wall of the avoidance chamber 61 , and the sealing plug 6 is not rubbed by the connecting member 5 .

[0053] Optionally, one end of the connecting member 5 away from the piston 3 passes through the through hole 131 and extends to the outside of the housing assembly.

[0054] In this embodiment, the connecting member 5 is a bolt, one end of which is threadedly connected to the piston 3 , and the other end of the bolt passes through the through hole 131 and extends to the outside of the housing assembly.

[0055] This embodiment uses bolts to connect with the piston 3, which can ensure the stability of the connection. The bolts are low in price and easy to obtain. The other end of the bolt passes through the through hole 131 and extends to the outside of the shell assembly. After the sealing plug 6 is removed, the end of the bolt extending to the outside of the shell assembly can be directly pulled manually, or a nut can be sleeved on the end of the bolt extending outside the shell assembly, and the nut can be rotated so that the nut pulls the bolt, which is easy to operate.

[0056] Optionally, there are multiple connecting members 5, which are arranged at equal intervals around the central axis of the piston 3, and the housing assembly is provided with multiple through holes 131, the multiple connecting members 5 correspond one-to-one to the multiple through holes 131, and each through hole 131 is provided with a sealing plug 6.

[0057] Optionally, the shell assembly includes a support 11, a shell 12 and a cover body 13, the friction pair 2 is arranged on the support 11; the shell 12 is detachably installed on the support 11, and the piston 3 is arranged on the shell 12; the cover body 13 is detachably installed on the shell 12, the spring 4 is located between the cover body 13 and the piston 3, and a through hole 131 is opened in the cover body 13.

[0058] In this embodiment, the shell 12 is located between the cover 13 and the support 11, and the two are detachably connected. The friction pair 2 is located between the shell 12 and the support 11, and the spring 4 and the piston 3 are located between the shell 12 and the cover 13, which is convenient for disassembly and replacement.

[0059] Optionally, the spring 4 is a butterfly spring. The butterfly spring is an existing component, easy to obtain, low in cost, and has a long service life and good elastic potential energy.

[0060] Optionally, the oil passage 121 is provided in the housing 12. During the disassembly of the parking brake device, if the piston 3 and the housing 12 have not been separated, the hydraulic oil in the oil passage 121 will not leak to the outside, thereby preventing the hydraulic oil from being sprayed onto the workers.

[0061] In this embodiment, a working chamber is provided inside the housing 12 , and a piston is slidably disposed in the working chamber. The oil passage 121 is connected to the working chamber. When the oil passage 121 injects hydraulic oil into the working chamber, the hydraulic oil pushes the piston away from the friction pair 2 .

[0062] The present embodiment also provides engineering machinery, which includes the parking brake device as above, and the parking brake device also includes two sealing rings 7, both of which are sealed between the inner wall of the housing assembly and the outer wall of the piston 3, one of the sealing rings 7 is located above the oil passage 121, and the other sealing ring 7 is located below the oil passage 121.

[0063] In this embodiment, the inner wall of the housing 12 is provided with a first limiting ring groove, in which one sealing ring 7 is sealingly embedded in the first limiting ring groove, and the outer wall of the piston 3 is provided with a second limiting ring groove, in which another sealing ring 7 is sealingly embedded in the second limiting ring groove. The two sealing rings 7 respectively seal the upper and lower sides of the oil channel 121 to prevent the hydraulic oil in the oil channel 121 from extending into the friction pair 2 or the spring 4.

[0064] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A parking brake device, characterized in that: include: A housing assembly having an oil passage (121) disposed therein; The friction pair (2), the piston (3) and the spring (4) are all arranged inside the housing assembly. The spring (4) is used to elastically drive the piston (3) toward the friction pair (2). The piston (3) can switch between a braking state of pressing the friction pair (2) and a braking release state of moving away from the friction pair (2). When hydraulic oil flows into the oil passage (121), the piston (3) switches to the braking release state. When the hydraulic oil stops flowing into the oil passage (121), the piston (3) switches to the braking state. A connecting member (5), a wall of the housing assembly being provided with a through hole (131), one end of the connecting member (5) being fixedly connected to the piston (3), and the other end of the connecting member (5) being aligned with the through hole (131) along the movement direction of the piston (3); The sealing plug (6) is detachably sealed to the through hole (131), and the sealing plug (6) and the connecting member (5) are not in contact with each other.

2. The parking brake device according to claim 1, characterized in that: The inner wall of the through hole (131) is provided with an internal thread, the outer wall of the sealing plug (6) is provided with an external thread, and the sealing plug (6) is threadedly connected to the through hole (131); Alternatively, the inner wall of the through hole (131) is provided with a slot, the outer wall of the sealing plug (6) is provided with a buckle, the buckle is engaged with the slot, and the inner wall of the through hole (131) is in close contact with the outer wall of the sealing plug (6); Alternatively, the sealing plug (6) is made of an elastic material, and one end of the sealing plug (6) is elastically compressed in the through hole (131).

3. The parking brake device according to claim 1, characterized in that: An escape chamber (61) is provided inside the sealing plug (6), and the escape chamber (61) extends along the movement direction of the piston (3), and the escape chamber (61) is used to escape the connecting piece (5).

4. The parking brake device according to claim 1, characterized in that: One end of the connecting member (5) away from the piston (3) passes through the through hole (131) and extends to the outside of the housing assembly.

5. The parking brake device according to claim 1, characterized in that: The connecting member (5) is a bolt, one end of which is threadedly connected to the piston (3), and the other end of which passes through the through hole (131) and extends to the outside of the housing assembly.

6. The parking brake device according to claim 1, characterized in that: The connecting members (5) are provided in plurality, and the connecting members (5) are arranged at equal intervals around the central axis of the piston (3); the housing assembly is provided with a plurality of through holes (131); the connecting members (5) correspond one-to-one to the through holes (131); and each of the through holes (131) is provided with a sealing plug (6).

7. The parking brake device according to claim 1, characterized in that: The housing assembly comprises: A support (11), wherein the friction pair (2) is arranged on the support (11); A housing (12) is detachably mounted on the support (11), and the piston (3) is arranged on the housing (12); The cover body (13) is detachably mounted on the housing (12); the spring (4) is located between the cover body (13) and the piston (3); and the through hole (131) is opened in the cover body (13).

8. The parking brake device according to claim 1, characterized in that: The spring (4) is a butterfly spring.

9. The parking brake device according to claim 1, characterized in that: The oil passage (121) is opened in the housing (12).

10. Construction machinery, characterized in that: The engineering machinery comprises a parking brake device as described in any one of claims 1 to 9, and the parking brake device also comprises two sealing rings (7), both of which are sealed between the inner wall of the housing assembly and the outer wall of the piston (3), one of the sealing rings (7) is located above the oil passage (121), and the other sealing ring (7) is located below the oil passage (121).

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