A reduction box and screw expander

Abstract

The present invention discloses a reduction box and a screw expander, which belong to the field of transmission technology. The reduction box includes a housing, an input shaft, a gear, a cylindrical roller bearing, an angular contact ball bearing and a rear end cover. The front end of the input shaft is located outside the housing, and the rear end is located inside the housing. The gear is located in the housing and connected to the input shaft. A pair of cylindrical roller bearings are arranged on both sides of the gear. The input shaft is supported on the housing through the cylindrical roller bearings. The angular contact ball bearing is sleeved on the rear end of the input shaft. The rear end cover is connected to the housing and abuts against the angular contact ball bearing. The cylindrical roller bearing is used to bear the radial force generated by the input shaft gear pair, and the angular contact ball bearing is used to bear the axial force generated by the input shaft gear pair, which increases the load-bearing capacity of the reduction box, improves the operating speed of the gear box, increases reliability, and reduces the probability of failure.

Description

Technical Field

[0001] The present invention relates to the field of transmission technology, and in particular to a reduction gearbox and a screw expander. Background Art

[0002] The reducer plays the role of matching the speed and transmitting the torque between the prime mover and the working machine or the actuator, and is widely used in modern machinery. When the power of the working machine or the actuator is large, the bearing is prone to overload and failure.

[0003] The reduction gearbox used in the existing screw expander generally adopts a pair of self-aligning bearings, and the bearings are located on both sides of the gear pair. With the rapid development of screw expander technology, the power of screw expanders has gradually increased. The power of existing high-power screw expanders is greater than 1000KW, and the speed reaches 3000r / min, which is close to the reference speed of the bearings. As a result, the bearings on the input shaft in the reduction gearbox fail in a short time, seriously affecting normal use. Summary of the invention

[0004] The object of the present invention is to provide a reduction gearbox and a screw expander to solve the technical problem in the prior art that the bearings on the input shaft of the reduction gearbox are prone to failure.

[0005] As conceived above, the technical solution adopted by the present invention is:

[0006] A reduction gearbox, comprising a housing, and further comprising:

[0007] An input shaft, a front end of which is located outside the housing and a rear end of which is located inside the housing;

[0008] a gear, located in the housing and connected to the input shaft;

[0009] Cylindrical roller bearings, a pair of the cylindrical roller bearings are arranged on both sides of the gear, and the input shaft is supported on the housing through the cylindrical roller bearings;

[0010] An angular contact ball bearing, sleeved on the rear end of the input shaft;

[0011] A rear end cover is connected to the housing and abuts against the angular contact ball bearing.

[0012] Among them, the pair of cylindrical roller bearings are a front cylindrical roller bearing and a rear cylindrical roller bearing, a first oil separator ring is arranged on the side of the front cylindrical roller bearing close to the inner cavity of the shell, and a second oil separator ring is arranged between the rear cylindrical roller bearing and the angular contact ball bearing.

[0013] Wherein, a mounting hole is opened on the housing corresponding to each of the cylindrical roller bearings, the front cylindrical roller bearing and the first oil separator ring are located in one of the mounting holes, and the rear cylindrical roller bearing and the second oil separator ring are located in another of the mounting holes.

[0014] Wherein, it also includes a front end cover, which is sleeved on the input shaft and connected to the housing, and the front end cover abuts against the front cylindrical roller bearing.

[0015] Wherein, a cavity is arranged on a side of the front end cover away from the front cylindrical roller bearing, an oil groove is opened at a position corresponding to the cavity on the input shaft, and an oil cover is arranged at the opening of the cavity.

[0016] Wherein, a shaft end baffle is detachably provided at the rear end of the input shaft, and the shaft end baffle abuts against the inner ring of the angular contact ball bearing.

[0017] Wherein, the rear end cover is a closed end cover, the angular contact ball bearing is located inside the rear end cover, and the shaft end baffle is spaced apart from the rear end cover.

[0018] Wherein, the angular contact ball bearing is a four-point angular contact ball bearing.

[0019] Wherein, the gear is key-connected to the input shaft.

[0020] A screw expander comprises the reduction box as described above.

[0021] Beneficial effects of the present invention:

[0022] The reduction gearbox proposed in the present invention is provided with a pair of cylindrical roller bearings, so that the input shaft is supported on the housing through the cylindrical roller bearings, and the cylindrical roller bearings are provided on both sides of the gear to withstand the radial force generated by the input shaft gear pair; an angular contact ball bearing is provided at the rear end of the input shaft to withstand the axial force generated by the input shaft gear pair; the cylindrical roller bearings and the angular contact ball bearings cooperate to increase the load-bearing capacity of the reduction gearbox, improve the operating speed of the gearbox, increase reliability, and reduce the probability of failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a partial schematic diagram of a reduction gearbox provided in an embodiment of the present invention.

[0024] In the figure:

[0025] 1. Shell;

[0026] 2. Input shaft;

[0027] 3. Gear;

[0028] 41. Front cylindrical roller bearing; 42. Rear cylindrical roller bearing;

[0029] 5. Angular contact ball bearings;

[0030] 61. rear end cover; 62. front end cover;

[0031] 71. first oil distribution ring; 72. second oil distribution ring;

[0032] 8. Shaft end baffle;

[0033] 9. Oil cap. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0035] 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.

[0036] In the present invention, 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.

[0037] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0038] See also Figure 1The embodiment of the present invention provides a reduction gearbox, comprising a housing 1, an input shaft 2 rotatably connected to the housing 1, and a gear 3 arranged on the input shaft 2, wherein the front end of the input shaft 2 is located outside the housing 1, and the rear end is located inside the housing 1, and the gear 3 is located inside the housing 1 and connected to the input shaft 2; the input shaft 2 is supported on the housing 1 by a cylindrical roller bearing so that the input shaft 2 can rotate relative to the housing 1, and a pair of cylindrical roller bearings are arranged on both sides of the gear 3 to withstand the radial force generated by the input shaft gear pair; in addition, an angular contact ball bearing 5 is also sleeved on the rear end of the input shaft 2, and the angular contact ball bearing 5 is abutted to limit the position through a rear end cover 61 connected to the housing 1, and the angular contact ball bearing 5 is used to withstand the axial force generated by the input shaft gear pair; the cylindrical roller bearing and the angular contact ball bearing 5 cooperate to increase the load-bearing capacity of the reduction gearbox, improve the operating speed of the gear box 3, increase the reliability, and reduce the failure probability.

[0039] In this embodiment, the angular contact ball bearing 5 is a four-point angular contact ball bearing, which occupies a small axial space, can withstand axial loads in two directions, and is easy to install. The gear 3 and the input shaft 2 can be key-connected or integrally formed, which is not limited here.

[0040] For ease of description, a pair of cylindrical roller bearings are divided into a front cylindrical roller bearing 41 and a rear cylindrical roller bearing 42, the front cylindrical roller bearing 41 is close to the front end of the input shaft 2, and the rear cylindrical roller bearing 42 is close to the rear end of the input shaft 2. A first oil separator 71 is provided on the side of the front cylindrical roller bearing 41 close to the inner cavity of the housing 1, and a second oil separator 72 is provided between the rear cylindrical roller bearing 42 and the angular contact ball bearing 5. The first oil separator 71 and the second oil separator 72 are used to transmit lubricating oil to lubricate the bearings.

[0041] The housing 1 is provided with a mounting hole corresponding to each cylindrical roller bearing, the front cylindrical roller bearing 41 and the first oil dividing ring 71 are located in one mounting hole, and the rear cylindrical roller bearing 42 and the second oil dividing ring 72 are located in another mounting hole. To facilitate position limiting, a position limiting protrusion is provided on one side of the mounting hole close to the inner cavity of the housing 1, the first oil dividing ring 71 abuts against the position limiting protrusion in one mounting hole, and the rear cylindrical roller bearing 42 abuts against the position limiting protrusion in the other mounting hole.

[0042] The angular contact ball bearing 5 is sleeved on the rear end of the input shaft 2. In order to limit the angular contact ball bearing 5, a shaft end baffle 8 is detachably provided on the rear end of the input shaft 2, and the shaft end baffle 8 abuts against the inner ring of the angular contact ball bearing 5. Specifically, the shaft end baffle 8 is connected to the input shaft 2 by screws.

[0043] The rear end cover 61 is a closed end cover, and the angular contact ball bearing 5 is located inside the rear end cover 61. The rear end cover 61 plays a sealing and protective role; the shaft end baffle 8 is spaced apart from the rear end cover 61, because the shaft end baffle 8 rotates with the input shaft 2, preventing the rear end cover 61 from interfering with the shaft end baffle 8.

[0044] In order to limit the front cylindrical roller bearing 41 , a front end cover 62 is further included. The front end cover 62 is sleeved on the input shaft 2 and connected to the housing 1 . The front end cover 62 abuts against the front cylindrical roller bearing 41 .

[0045] A cavity is provided on the side of the front end cover 62 away from the front cylindrical roller bearing 41 , an oil groove is provided on the input shaft 2 at a position corresponding to the cavity, and an oil cover 9 is provided at the opening of the cavity to seal the lubricating oil.

[0046] For the side of the rear cylindrical roller bearing 42 close to the inner cavity of the housing 1, the inner ring of the rear cylindrical roller bearing 42 abuts against the shoulder of the input shaft 2 to limit the position, and the outer ring of the rear cylindrical roller bearing 42 abuts against the limiting protrusion to limit the position; for the side of the rear cylindrical roller bearing 42 away from the inner cavity of the housing 1, a second oil dividing ring 72, an angular contact ball bearing 5 and a rear end cover 61 are arranged in sequence, one side of the angular contact ball bearing 5 abuts against the shoulder of the input shaft 2, the second oil dividing ring 72 is clamped between the rear cylindrical roller bearing 42 and the angular contact ball bearing 5, and the rear end cover 61 abuts against the outer ring of the angular contact ball bearing 5; in addition, one side of the inner ring of the angular contact ball bearing 5 abuts against the shoulder of the input shaft 2 to limit the position, and the other side of the inner ring of the angular contact ball bearing 5 abuts against the shaft end baffle 8 to limit the position.

[0047] For the side of the front cylindrical roller bearing 41 close to the inner cavity of the housing 1, a first oil dividing ring 71 is sandwiched between the limiting protrusion of the mounting hole of the housing 1; for the side of the front cylindrical roller bearing 41 away from the inner cavity of the housing 1, it abuts against the front end cover 62.

[0048] Of course, the reduction box is also provided with a driven wheel and other components meshing with the gear 3, which will not be described here. During the operation of the reduction box, the cylindrical roller bearing bears the radial force generated by the input shaft gear pair, and the angular contact ball bearing 5 bears the axial force generated by the input shaft gear pair, which increases the load-bearing capacity of the reduction box, improves the operating speed of the gear 3 box, increases reliability, and reduces the probability of failure.

[0049] The embodiment of the present invention also provides a screw expander, including the above-mentioned reduction box. Through the cooperation of the cylindrical roller bearing and the angular contact ball bearing 5 in the reduction box, the load capacity of the reduction box is increased, the operating speed of the gear box 3 is increased, the reliability is increased, and the failure probability is reduced, so that it can adapt to high-power and high-speed screw expanders.

[0050] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A reduction gearbox, comprising a housing (1), characterized in that: Also includes: An input shaft (2), a front end of which is located outside the housing (1) and a rear end of which is located inside the housing (1); A gear (3) located in the housing (1) and connected to the input shaft (2); Cylindrical roller bearings, a pair of the cylindrical roller bearings being arranged on both sides of the gear (3), and the input shaft (2) being supported on the housing (1) through the cylindrical roller bearings; An angular contact ball bearing (5) is sleeved on the rear end of the input shaft (2); A rear end cover (61) connected to the housing (1) and abutting against the angular contact ball bearing (5); The pair of cylindrical roller bearings are respectively a front cylindrical roller bearing (41) and a rear cylindrical roller bearing (42); a first oil separator ring (71) is arranged on a side of the front cylindrical roller bearing (41) close to the inner cavity of the housing (1); and a second oil separator ring (72) is arranged between the rear cylindrical roller bearing (42) and the angular contact ball bearing (5); The housing (1) is provided with a mounting hole corresponding to each of the cylindrical roller bearings, the front cylindrical roller bearing (41) and the first oil separator ring (71) are located in one of the mounting holes, and the rear cylindrical roller bearing (42) and the second oil separator ring (72) are located in another of the mounting holes; A limiting protrusion is provided on one side of the mounting hole close to the inner cavity of the housing (1); the first oil distribution ring (71) abuts against the limiting protrusion in one mounting hole; and the rear cylindrical roller bearing (42) abuts against the limiting protrusion in another mounting hole; A shaft end baffle (8) is detachably provided at the rear end of the input shaft (2), and the shaft end baffle (8) abuts against the inner ring of the angular contact ball bearing (5); The rear end cover (61) is a closed end cover, the angular contact ball bearing (5) is located inside the rear end cover (61), and the shaft end baffle (8) is spaced apart from the rear end cover (61).

2. The reduction gearbox according to claim 1, characterized in that: It also includes a front end cover (62), which is sleeved on the input shaft (2) and connected to the housing (1), and the front end cover (62) abuts against the front cylindrical roller bearing (41).

3. The reduction gearbox according to claim 2, characterized in that: A cavity is provided on a side of the front end cover (62) away from the front cylindrical roller bearing (41), an oil groove is provided at a position corresponding to the cavity on the input shaft (2), and an oil cover (9) is provided at the opening of the cavity.

4. The reduction gearbox according to claim 1, characterized in that: The angular contact ball bearing (5) is a four-point angular contact ball bearing.

5. The reduction gearbox according to claim 1, characterized in that: The gear (3) is key-connected to the input shaft (2).

6. A screw expander, characterized in that: Comprising a reduction gearbox as described in any one of claims 1-5.

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