Enveloping speed reducer with adjustable back clearance

Abstract

The utility model discloses an envelope speed reducer with an adjustable back clearance, which comprises a shell, a worm gear arranged in the shell, a worm matched with the worm gear, a tapered roller bearing arranged at one end of the worm, and an eccentric bearing seat provided with a bearing hole matched with the tapered roller bearing. The outer circle axis of the eccentric bearing seat and the axis of the bearing hole deflect by a certain distance, the eccentric bearing seat is provided with a locking piece, and the locking piece can limit the tapered roller bearing to rotate in the eccentric bearing seat.

Description

Technical Field

[0001] This utility model belongs to the field of speed reducer technology, and in particular relates to an envelope speed reducer with adjustable backlash. Background Technology

[0002] Worm gear drives are devices that convert the high-speed, low-torque rotation of an electric motor into low-speed, high-torque operation. They are high-ratio, compact actuators available in both open and closed forms, and are currently widely used in both civilian and military fields.

[0003] Patent CN202310340560.0 discloses an adjustable backlash roller backlash envelope reducer, comprising a housing, a worm gear, a worm, an eccentric bushing, and a bearing. The housing has an internal cavity divided into a first cavity and a second cavity. The worm gear and the worm are rotatably mounted sequentially in the first and second cavities, respectively. The worm and the worm gear mesh, with the worm gear positioned above the worm. At least one eccentric mechanism is mounted on the worm to adjust the distance between the worm and the worm gear. This invention achieves adjustable backlash without disassembling the reducer, solving the technical problem of increased backlash due to material wear, ensuring the meshing accuracy between the worm gear and the worm, and extending the service life of the reducer.

[0004] In the aforementioned patent, the backlash is adjusted by adjusting the bearings at both ends of the worm gear, which is inconvenient to operate. Utility Model Content

[0005] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0006] To address the technical problems mentioned in the background section above, some embodiments of this application provide an envelope reducer with adjustable backlash, including a housing, a worm gear disposed within the housing, a worm cooperating with the worm gear, a tapered roller bearing disposed at one end of the worm, and an eccentric bearing housing. The eccentric bearing housing has a bearing hole that mates with the tapered roller bearing. The outer circular axis of the eccentric bearing housing is offset from the axis of the bearing hole by a certain distance. The eccentric bearing housing is provided with a locking element that can restrict the tapered roller bearing from rotating within the eccentric bearing housing.

[0007] Preferably, the housing has a mounting cavity that mates with the worm gear, and a sliding bearing is provided on the inner wall of the mounting cavity.

[0008] Preferably, the outer wall of the worm gear is provided with a four-point contact ball bearing, and the outer wall of the worm gear is provided with a groove that mates with the four-point contact ball bearing.

[0009] Preferably, the worm gear is provided with a through hole, and the through hole is provided in a corresponding groove.

[0010] Preferably, the through hole is detachably equipped with a stop bar.

[0011] Preferably, the inner wall of the worm gear is provided with a fixing block, the fixing block is screwed with a locking rod, the stop rod is provided with a locking hole that cooperates with the locking rod, and the fixing block is provided with a round hole that communicates with the through hole.

[0012] Preferably, the locking component includes a first locking cover disposed in the eccentric bearing housing, a first locking screw screwed onto the eccentric bearing housing, and a locking screw cap sleeved on the eccentric bearing housing.

[0013] Preferably, the locking element includes a second locking screw, a third locking screw, and a second locking cover disposed on the housing. One end of the second locking screw abuts against the eccentric bearing seat, and one end of the third locking screw abuts against the second locking cover.

[0014] This application provides an envelope reducer with adjustable backlash that is easy to adjust. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0016] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0017] In the attached diagram:

[0018] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present utility model.

[0019] Figure 2 This is a cross-sectional view of the first embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the internal structure of the first embodiment of the present invention.

[0021] Figure 4 for Figure 3 A magnified view of point A.

[0022] Figure 5 This is a cross-sectional view of the second embodiment of the present invention. Detailed Implementation

[0023] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0024] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0025] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0026] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0027] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] First Embodiment

[0029] like Figure 1-4 As shown, an adjustable backlash envelope reducer includes a housing 1, a worm gear 2, a worm 3, a tapered roller bearing 4, an eccentric bearing housing 5, and a locking component. The housing 1 has an installation cavity. The worm gear 2 is connected to the housing via a connector and has multiple teeth evenly distributed on it. The worm 3 is located in the installation cavity and meshes with the teeth of the worm gear. The tapered roller bearing 4 is located at both ends of the worm, with one fixed in the housing and the other in the eccentric bearing housing. The tapered roller bearing is allowed to deflect at a certain angle during use. The eccentric bearing housing 5 is rotatably located within the housing and has a bearing hole that mates with the tapered roller bearing. The outer axis of the eccentric bearing housing is deflected by a certain distance from the axis of the bearing hole. By rotating the eccentric bearing housing, one end of the worm can be moved up and down, thereby changing the backlash between the worm and the worm gear. Since the tapered roller bearing is allowed to deflect at a certain angle during use, this application only requires adjusting one end of the worm to complete the backlash adjustment, which is very convenient.

[0030] Specifically, the connecting parts include a sliding bearing 22 and a four-point contact ball bearing 24. One side of the sliding bearing 22 is fixed to the inner wall of the mounting cavity, and the other side is fixed to the worm gear. The outer wall of the worm gear 2 has a groove, and the four-point contact ball bearing 24 is installed in the groove. The inner wall of the mounting cavity has a groove 23 corresponding to the groove. The four-point contact ball bearing, the worm gear and the housing adopt a zero clearance interference fit. This structure is compact and has strong integration, which enhances the axial load, radial load and anti-overturning ability of the reducer.

[0031] Furthermore, the worm gear 2 has a through hole, which corresponds to the groove. A stop rod 25 passes through the through hole. A fixing block 26 is provided on the inner wall of the worm gear 2. A locking rod 27 is screwed onto the fixing block 26. The stop rod 25 has a locking hole for the locking rod to pass through. The fixing block has a round hole that communicates with the through hole. The four-point contact ball bearing can be replaced and installed through the round hole.

[0032] Specifically, the locking components include a first locking cover 61, a first locking screw 62, and a locking screw cap 63. The first locking cover 61 is located inside the bearing hole, with one end abutting against the end face of the tapered roller bearing. The first locking screw 62 is screwed onto the eccentric bearing seat, with its end abutting against the first locking cover. The locking screw cap 63 is sleeved and screwed onto the eccentric bearing seat, and can be locked by rotating the locking screw cap against the outer wall of the housing.

[0033] Second Embodiment

[0034] like Figure 5 As shown, the difference between this embodiment and the first embodiment is that the locking component includes a second locking screw 64, a third locking screw 65 disposed on the housing, and a second locking cover 66. The second locking screw 64 is screwed onto the housing, with one end abutting against the eccentric bearing seat. The third locking screw 65 is screwed onto the housing, with one end abutting against the second locking cover.

[0035] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. An envelope reducer with adjustable backlash, characterized in that, The device includes a housing, a worm gear disposed within the housing, a worm cooperating with the worm gear, a tapered roller bearing disposed at one end of the worm, and an eccentric bearing housing. The eccentric bearing housing has a bearing hole that mates with the tapered roller bearing. The outer circular axis of the eccentric bearing housing is offset from the axis of the bearing hole by a certain distance. The eccentric bearing housing is provided with a locking element that can restrict the tapered roller bearing from rotating within the eccentric bearing housing.

2. The backlash-adjustable envelope reducer according to claim 1, characterized in that: The housing is provided with a mounting cavity that mates with the worm gear, and a sliding bearing is provided on the inner wall of the mounting cavity.

3. The backlash-adjustable envelope reducer according to claim 2, characterized in that: The outer wall of the worm gear is provided with a four-point contact ball bearing, and the outer wall of the worm gear is provided with a groove that mates with the four-point contact ball bearing.

4. The backlash-adjustable envelope reducer according to claim 3, characterized in that: The worm gear is provided with a through hole, and the through hole is provided in a corresponding groove.

5. The backlash-adjustable envelope reducer according to claim 4, characterized in that: The through hole is detachably equipped with a stop bar.

6. The backlash-adjustable envelope reducer according to claim 5, characterized in that: The inner wall of the worm gear is provided with a fixing block, the fixing block is screwed with a locking rod, the stop rod is provided with a locking hole that cooperates with the locking rod, and the fixing block is provided with a round hole that communicates with the through hole.

7. The backlash-adjustable envelope reducer according to claim 1, characterized in that: The locking component includes a first locking cover disposed within the eccentric bearing housing, a first locking screw screwed onto the eccentric bearing housing, and a locking screw cap sleeved on the eccentric bearing housing.

8. The backlash-adjustable envelope reducer according to claim 1, characterized in that: The locking component includes a second locking screw, a third locking screw, and a second locking cover disposed on the housing. One end of the second locking screw abuts against the eccentric bearing seat, and one end of the third locking screw abuts against the second locking cover.

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