Winding speed reducer and working machine

Abstract

The utility model belongs to the technical field of operation machinery, and particularly relates to a winding speed reducer and operation machinery, the winding speed reducer comprises a support frame, one end of the support frame is provided with a mounting cavity, and the speed reducer further comprises a transmission shaft, a transmission shaft and a transmission shaft, the brake shaft sleeve is arranged on the periphery of the transmission shaft in a sleeving manner; the brake assembly is arranged between the peripheral side of the brake shaft sleeve and the inner wall of the mounting cavity and is in driving connection with the brake shaft sleeve; the periphery of the brake shaft sleeve is sleeved with the driving piston, and the driving piston can move in the axial direction of the transmission shaft and is used for pushing the brake assembly to lock the brake shaft sleeve; and the star-shaped ring is in sealing fit with the peripheral wall of the driving piston and the inner wall of the mounting cavity. By adopting the winch speed reducer, the sealing effect between the driving piston and the inner wall of the mounting cavity is enhanced, external impurities are prevented from entering precise parts in the winch speed reducer, and the service life of the winch speed reducer is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of working machinery, and particularly relates to a hoisting speed reducer and a working machinery. Background Art

[0002] Many existing working machineries are equipped with hoisting devices, such as crane trucks, network closing and spanning operation trucks, etc. The hoisting device generally consists of a hoisting driving member, a hoisting speed reducer and a hoisting drum. The power output by the hoisting driving member is decelerated by the hoisting speed reducer, so as to realize the low-speed and high-horsepower operation of the hoisting drum.

[0003] The hoisting speed reducer generally includes a support frame, an output shaft and a braking assembly. The braking assembly usually needs to be pushed by a driving piston to perform braking. However, the driving piston is in clearance fit with the support frame, and a sealing ring needs to be arranged between the driving piston and the support frame to prevent external impurities from entering the hoisting mechanism. In the prior art, an O-ring is mostly used to ensure sealing. However, the O-ring is prone to rolling during the movement of the driving piston, resulting in poor sealing effect and easy leakage. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a hoisting speed reducer and a working machinery to solve the technical problem of poor sealing effect between the driving piston and the support frame in the prior art.

[0005] To achieve the above purpose, on the one hand, the utility model provides a hoisting speed reducer, which includes a support frame. An installation cavity is formed at one end of the support frame. The speed reducer further includes components installed in the installation cavity:

[0006] A transmission shaft;

[0007] A brake shaft sleeve sleeved on the outer periphery of the transmission shaft;

[0008] A braking assembly arranged between the outer peripheral side of the brake shaft sleeve and the inner wall of the installation cavity and drivingly connected with the brake shaft sleeve;

[0009] A driving piston sleeved on the outer periphery of the brake shaft sleeve. The driving piston can move along the axial direction of the transmission shaft and is used to push the braking assembly to lock the brake shaft sleeve;

[0010] A star-shaped ring, which is in sealing fit with both the outer peripheral wall of the driving piston and the inner wall of the installation cavity.

[0011] In some embodiments, the shape of the driving piston is adapted to the shape of the inner wall of the installation cavity. The inner wall of the installation cavity includes a plurality of sequentially connected stepped surfaces. The number of star-shaped rings is multiple, and the multiple star-shaped rings are hermetically embedded between different stepped surfaces and the driving piston.

[0012] In some embodiments, the hoisting speed reducer further includes a hydraulic pump. A pressure chamber for containing hydraulic oil is formed between the driving piston and the inner wall of the installation cavity. Star rings are provided at both ends of the pressure chamber along the axial direction of the transmission shaft. The pressure chamber is communicated with the hydraulic pump, and the hydraulic pump is used to convey or absorb hydraulic oil to drive the driving piston to move along the axial direction of the transmission shaft.

[0013] In some embodiments, the star ring includes a sealing body and a plurality of sealing lips protruding outward from the sealing body. The plurality of sealing lips are symmetrically distributed and extend towards the driving piston and the inner wall of the installation cavity. A lubricating cavity is formed between any two adjacent sealing lips on the same side.

[0014] In some embodiments, the flash of the star ring is located on the inner side wall of the lubricating cavity.

[0015] In some embodiments, the support frame further includes a receiving groove formed on the inner wall of the installation cavity for receiving the star ring. The receiving groove is open on the side facing the driving piston.

[0016] In some embodiments, a limiting retaining ring is further provided in the receiving groove. The limiting retaining ring is provided on one side of the star ring along the axial direction of the transmission shaft.

[0017] In some embodiments, a plurality of limiting retaining rings are arranged at intervals along the axial direction of the transmission shaft in the receiving groove, and the star ring is arranged between any two limiting retaining rings.

[0018] In some embodiments, both the limiting retaining ring and the star ring are made of rubber.

[0019] The second aspect of the present utility model provides a working machine, including the above-mentioned hoisting speed reducer.

[0020] In the above technical solution, the hoisting speed reducer includes a support frame, a transmission shaft, a brake bushing, a brake assembly, a driving piston and a star ring. The brake bushing is sleeved on the outer periphery of the transmission shaft. The brake assembly can be pushed by the driving piston to lock the brake bushing to brake the transmission shaft. The star ring is hermetically installed between the outer peripheral wall of the driving piston and the inner wall of the installation cavity. During the movement of the driving piston along the axial direction of the transmission shaft, the star ring cannot roll over, and the star ring maintains a sealing fit state between the driving piston and the inner wall of the installation cavity, strengthening the sealing effect between the driving piston and the inner wall of the installation cavity, preventing external impurities from entering the precision components inside the hoisting speed reducer, and prolonging the service life of the hoisting speed reducer.

[0021] Other features and advantages of the embodiments of the present utility model will be described in detail in the subsequent specific embodiments section. Description of the Drawings

[0022] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present utility model, but do not constitute a limitation to the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on the structures shown in these drawings without creative efforts. In the drawings:

[0023] Figure 1 It is a schematic cross-sectional structure diagram of a hoisting speed reducer provided in an embodiment of the present utility model;

[0024] Figure 2 It is a schematic diagram of the application scenario of a star-shaped ring provided in an embodiment of the present utility model.

[0025] Description of reference numerals

[0026] 10 Support frame

[0027] 111 Pressure chamber

[0028] 112 Receiving groove

[0029] 20 Transmission shaft

[0030] 30 Brake shaft sleeve

[0031] 40 Brake assembly

[0032] 50 Driving piston

[0033] 60 Star-shaped ring

[0034] 61 Sealing body

[0035] 62 Sealing lip

[0036] 63 Lubrication cavity

[0037] 70 Limit retaining ring Specific embodiments

[0038] The following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present utility model and are not used to limit the present utility model.

[0039] The following will describe a hoisting speed reducer and a working machine according to the present utility model with reference to the accompanying drawings.

[0040] As Figure 1 shown, it is a schematic cross-sectional structure diagram of a hoisting speed reducer provided in an embodiment of the present utility model. The hoisting speed reducer provided by the present utility model includes a support frame 10, and one end of the support frame 10 is provided with an installation cavity (not shown in the figure). The speed reducer further includes those installed in the installation cavity:

[0041] transmission shaft 20;

[0042] brake shaft sleeve 30, sleeved on the outer periphery of the transmission shaft 20;

[0043] brake assembly 40, arranged between the outer peripheral side of the brake shaft sleeve 30 and the inner wall of the installation cavity and drivingly connected to the brake shaft sleeve 30;

[0044] driving piston 50, sleeved on the outer periphery of the brake shaft sleeve 30, the driving piston 50 can move along the axial direction of the transmission shaft 20 and is used to push the brake assembly 40 to lock the brake shaft sleeve 30;

[0045] star-shaped ring 60, sealingly fitted with both the outer peripheral wall of the driving piston 50 and the inner wall of the installation cavity.

[0046] Many existing working machines are equipped with hoisting equipment, such as crane trucks, net-crossing operation trucks, etc. The hoisting speed reducer of the present utility model includes a transmission shaft 20, a brake shaft sleeve 30, a brake assembly 40, a driving piston 50 and a star-shaped ring 60. The support frame 10 is provided with an installation cavity, and the inside of the installation cavity can be used to install the transmission components of the hoisting speed reducer. Among them, the transmission shaft 20 can be used to transmit the driving force transmitted by an external rotary driving member to other transmission components in the installation cavity. The brake shaft sleeve 30 is sleeved on the outer periphery of the transmission shaft 20. When it is necessary to brake the hoisting speed reducer, the transmission shaft 20 can be braked by stopping the rotation of the brake shaft sleeve 30. The brake assembly 40 is arranged between the outer peripheral side of the brake shaft sleeve 30 and the inner wall of the installation cavity and is drivingly connected to the brake shaft sleeve 30. When the brake assembly 40 starts to brake, the rotation of the brake shaft sleeve 30 can be stopped, thereby braking the hoisting speed reducer. The driving piston 50 is sleeved on the outer periphery of the brake shaft sleeve 30 and can move along the axial direction of the transmission shaft 20. When the driving piston 50 moves towards the brake assembly 40, the brake assembly 40 can be started to brake the hoisting speed reducer. The star-shaped ring 60 is installed between the outer peripheral wall of the driving piston 50 and the inner wall of the installation cavity and is sealingly fitted with both of the above. When the driving piston 50 moves axially along the transmission shaft 20, the star-shaped ring 60 cannot roll between the driving piston 50 and the inner wall of the installation cavity and can always maintain a seal with the driving piston 50 and the inner wall of the installation cavity to prevent external impurities from entering the precision components (such as gears, bearings, etc.) inside the hoisting speed reducer through the gap between the driving piston 50 and the inner wall of the installation cavity, thus extending the service life of the hoisting speed reducer.

[0047] In a specific embodiment, the braking assembly 40 includes a plurality of brake rings arranged in parallel at intervals along the axial direction of the transmission shaft 20. The inner ends of the plurality of brake rings are all mounted on the brake shaft sleeve 30. The driving piston 50 abuts against one side of the plurality of brake rings, and the inner wall of the installation cavity abuts against the other side of the plurality of brake rings. The plurality of brake rings are used to brake and lock the brake shaft sleeve 30 and the transmission shaft 20 under the pushing action of the driving piston 50.

[0048] In the above-mentioned hoisting speed reducer, a star-shaped ring 60 is installed between the driving piston 50 and the inner wall of the installation cavity. The star-shaped ring 60 is hermetically connected to both the inner wall of the installation cavity and the driving piston 50. Moreover, the star-shaped ring 60 cannot roll when the driving piston 50 moves axially, so that the star-shaped ring 60 can always maintain a sealed state with the driving piston 50 and the inner wall of the installation cavity, and the sealing is more stable, preventing external impurities from entering the precision components inside the hoisting speed reducer and affecting the service life of the hoisting speed reducer.

[0049] In an embodiment, the shape of the driving piston 50 is adapted to the shape of the inner wall of the installation cavity. The inner wall of the installation cavity includes a plurality of sequentially connected stepped surfaces. The number of star-shaped rings 60 is multiple, and the multiple star-shaped rings 60 are hermetically embedded between different stepped surfaces and the driving piston 50. In order to further enhance the sealing effect, the shape of the driving piston 50 is adapted to the stepped surface of the installation cavity, and multiple star-shaped rings 60 are arranged between different stepped surfaces and the driving piston 50. When any one of the star-shaped rings 60 fails, the other star-shaped rings 60 can still maintain a seal between the inner wall of the installation cavity and the driving piston 50. By using the above-mentioned hoisting speed reducer, the sealing effect can be further enhanced, preventing external impurities from entering the hoisting speed reducer and affecting the service life of the precision components inside the hoisting speed reducer.

[0050] In an embodiment, the hoisting speed reducer further includes a hydraulic pump (not shown in the figure). A pressure cavity 111 for accommodating hydraulic oil is formed between the driving piston 50 and the inner wall of the installation cavity. Star-shaped rings 60 are provided at both ends of the pressure cavity along the axial direction of the transmission shaft 20. The pressure cavity 111 is communicated with the hydraulic pump, and the hydraulic pump is used to transport or absorb hydraulic oil to drive the driving piston 50 to move along the axial direction of the transmission shaft 20. The hydraulic pump can be communicated with an external hydraulic oil circuit or with a hydraulic oil tank. When it is necessary to drive the driving piston 50 to brake the hoisting speed reducer, the hydraulic pump absorbs the hydraulic oil in the pressure cavity 111 to make the driving piston 50 move in the direction towards the braking assembly 40. When it is necessary to release the brake, the hydraulic pump delivers hydraulic oil to the pressure cavity 111 to make the driving piston 50 move in the direction away from the braking assembly 40. Star-shaped rings 60 are provided at both ends of the pressure cavity 111 along the axial direction of the transmission shaft, which can prevent external impurities from entering the pressure cavity 111 and reduce the service life of the hydraulic pump. Moreover, by using hydraulic oil to drive the driving piston 50, the driving piston 50 can move more smoothly and the torque transmission is stable.

[0051] In one embodiment, as Figure 2 shown, it is a schematic diagram of the application scenario of the star-shaped seal ring 60 provided according to the embodiment of the present utility model. The star-shaped seal ring 60 includes a sealing body 61 and a plurality of sealing lips 62 protruding outward from the sealing body 61. The plurality of sealing lips 62 are symmetrically distributed and extend toward the driving piston 50 and the inner wall of the installation cavity. A lubricating cavity 63 is formed between any two adjacent sealing lips 62 on the same side. The star-shaped seal ring 60 includes a plurality of sealing lips 62, and the sealing lips 62 can protrude outward and abut against the driving piston 50 and the inner wall of the installation cavity to enhance the sealing effect. A lubricating cavity 63 is formed between two adjacent sealing lips 62, and lubricating grease can be stored in the lubricating cavity 63 to reduce the friction between the star-shaped seal ring 60 and the driving piston 50. When the driving piston 50 moves along the axial direction of the transmission shaft 20, there is relative movement between the driving piston 50 and the star-shaped seal ring 60. If the friction force is large, the star-shaped seal ring 60 will be severely worn, reducing the service life of the star-shaped seal ring 60. Storing lubricating grease in the lubricating cavity 63 can reduce the sliding friction between the star-shaped seal ring 60 and the driving piston 50 and extend the service life of the star-shaped seal ring 60.

[0052] In one embodiment, the flash (not shown in the figure) of the star-shaped seal ring 60 is located on the inner side wall of the lubricating cavity 63. The flash refers to the phenomenon that the melt is extruded from the parting surface of the mold and a thin sheet is generated at the edge of the product. In the prior art, the flash of the O-ring is mostly located on the circumferential side of the ring body, and it is easy to generate a large friction force with the driving piston 50 or the inner wall of the installation cavity during the movement of the driving piston 50, thereby reducing the service life of the O-ring. However, the flash of the star-shaped seal ring 60 of the present utility model is located on the inner wall of the lubricating cavity 63. The inner side wall of the lubricating cavity 63 is recessed toward the sealing body 61 and has no direct contact with the driving piston 50 and the inner wall of the installation cavity, reducing the friction between the star-shaped seal ring 60 and the driving piston 50 and extending the service life of the star-shaped seal ring 60.

[0053] In one embodiment, the support frame 10 further includes a receiving groove 112 formed on the inner wall of the installation cavity and used for receiving the star-shaped seal ring 60. The receiving groove 112 is open on the side facing the driving piston 50. The receiving groove 112 can be used to receive the star-shaped seal ring 60. When the driving piston 50 moves axially, it remains stationary in the receiving groove 112, and the star-shaped seal ring 60 slides relative to the driving piston 50 to ensure the sealing effect between the star-shaped seal ring 60 and the driving piston 50 and prevent external impurities from entering the precision components in the winch reducer. And one side of the star-shaped seal ring 60 contacts the driving piston 50, and the other side of the star-shaped seal ring 60 contacts the inner side wall of the receiving groove 112. The pressure distribution of the star-shaped ring on the inner side wall of the receiving groove 112 and the driving piston 50 is uniform, and an excellent sealing effect can be obtained.

[0054] In one embodiment, the star-shaped seal ring 60 is installed in the receiving groove 112 and has a compression force smaller than that of the O-ring. The smaller compression force can reduce the friction of the star-shaped seal ring 60, lower the wear force, and extend the service life of the star-shaped seal ring 60.

[0055] In one embodiment, as Figure 2 shown, a limiting retaining ring 70 is further provided in the receiving groove 112. The limiting retaining ring 70 is disposed on one side of the star-shaped seal ring 60 along the axial direction of the transmission shaft 20. On the one hand, the limiting retaining ring 70 can enhance the sealing effect, and on the other hand, it can prevent the star-shaped seal ring 60 from moving and tumbling in the receiving groove 112. By adopting the above-mentioned limiting retaining ring 70, the sealing effect of the star-shaped seal ring 60 can be further enhanced, seal failure can be prevented, and the service life of the hoisting speed reducer can be extended.

[0056] In one embodiment, a plurality of limiting retaining rings 70 are arranged at intervals along the axial direction of the transmission shaft 20 in the receiving groove 112, and the star-shaped seal ring 60 is disposed between any two limiting retaining rings 70. The plurality of limiting retaining rings 70 can further enhance the sealing effect and prevent the star-shaped seal ring 60 from moving in the receiving groove 112, and the sealing effect is better.

[0057] In one embodiment, both the limiting retaining ring 70 and the star-shaped seal ring 60 are made of rubber. The rubber material has elasticity, and the gap between the driving piston 50 and the inner wall of the installation cavity can be fully sealed through the elastic tension, and the sealing effect is good.

[0058] By adopting the above-mentioned hoisting speed reducer, a star-shaped seal ring 60 is installed between the driving piston 50 and the inner wall of the installation cavity, and the star-shaped seal ring 60 remains stationary when the driving piston 50 moves along the axial direction of the transmission shaft 20. Compared with the O-ring, the star-shaped seal ring 60 will not roll when the driving piston 50 moves, and the sealing effect is better. And the number of the star-shaped seal rings 60 is multiple, and a lubricating cavity 63 for accommodating lubricating grease is formed between the multiple star-shaped seal rings 60. The lubricating grease in the lubricating cavity 63 can enhance the sealing effect. The pressure distribution between the star-shaped seal ring 60 and the inner walls of the driving piston 50 and the installation cavity is uniform, the sealing effect is excellent, and the friction force is small. A receiving groove 112 is formed on the inner wall of the installation cavity and is open towards the driving piston 50. The receiving groove 112 is provided with a star-shaped seal ring 60 and a limiting retaining ring 70. The limiting retaining ring 70 can prevent the star-shaped seal ring 60 from flipping in the receiving groove 112, and can also further enhance the sealing effect, preventing impurities from entering the precision components in the hoisting speed reducer and shortening the service life of the hoisting speed reducer.

[0059] In one embodiment, a working machine is provided, including the above-mentioned hoisting speed reducer.

[0060] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0061] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0062] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0063] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A winch reducer, characterized in that: The winch reducer comprises a support frame (10), one end of the support frame (10) is provided with an installation cavity, and the winch reducer further comprises: Transmission shaft (20); A brake sleeve (30) sleeved on the outer circumference of the transmission shaft (20); A brake assembly (40) is disposed between the outer peripheral side of the brake sleeve (30) and the inner wall of the mounting cavity and is drivingly connected to the brake sleeve (30); A driving piston (50) is sleeved on the outer circumference of the brake sleeve (30), and the driving piston (50) can move along the axial direction of the transmission shaft (20) and is used to push the brake assembly (40) to lock the brake sleeve (30); The star ring (60) is in sealing cooperation with the outer peripheral wall of the driving piston (50) and the inner wall of the installation cavity.

2. The winch reducer according to claim 1, characterized in that: The shape of the driving piston (50) is adapted to the shape of the inner wall of the mounting cavity, the inner wall of the mounting cavity comprises a plurality of stepped surfaces connected in sequence, the number of the star rings (60) is multiple, and the multiple star rings (60) are sealingly embedded between different stepped surfaces and the driving piston (50).

3. The winch reducer according to claim 2, characterized in that: The winch reducer also includes a hydraulic pump. A pressure chamber (111) for accommodating hydraulic oil is formed between the driving piston (50) and the inner wall of the mounting chamber. The star rings (60) are provided at both ends of the pressure chamber along the axial direction of the transmission shaft (20). The pressure chamber (111) is connected to the hydraulic pump. The hydraulic pump is used to transport or absorb the hydraulic oil to drive the driving piston (50) to move along the axial direction of the transmission shaft (20).

4. The winch reducer according to claim 1, characterized in that: The star ring (60) comprises a sealing body (61) and a plurality of sealing lips (62) protruding outward from the sealing body (61); the plurality of sealing lips (62) are symmetrically distributed and extend toward the driving piston (50) and the inner wall of the mounting cavity; a lubrication cavity (63) is formed between any two adjacent sealing lips (62) on the same side.

5. The winch reducer according to claim 4, characterized in that: The parting flash of the star-shaped ring (60) is located on the inner wall of the lubrication cavity (63).

6. The winch reducer according to claim 1, characterized in that: The support frame (10) further comprises a receiving groove (112) opened on the inner wall of the installation cavity and used for receiving the star ring (60), and the receiving groove (112) is openly arranged on one side facing the driving piston (50).

7. The winch reducer according to claim 6, characterized in that: A limit stop ring (70) is also provided in the accommodating groove (112), and the limit stop ring (70) is provided on one side of the star ring (60) along the axial direction of the transmission shaft (20).

8. The winch reducer according to claim 6, characterized in that: A plurality of limit retaining rings (70) are arranged in the accommodating groove (112) at intervals along the axial direction of the transmission shaft (20), and the star ring (60) is arranged between any two of the limit retaining rings (70).

9. The winch reducer according to claim 7 or 8, characterized in that: The limit stop ring (70) and the star ring (60) are both made of rubber material.

10. A working machine, characterized in that: It comprises a winch reducer according to any one of claims 1 to 9.

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