CN219570655U - Bearing positioning structure for spiral hydraulic actuator - Google Patents

Abstract

The utility model provides a bearing positioning structure for a spiral hydraulic actuator, and relates to the technical field of spiral hydraulic actuators. The novel bearing positioning device comprises an outer ring positioning assembly and an inner ring positioning assembly, wherein the outer ring positioning assembly comprises a bearing positioning ring, a rear guide sleeve and a locking nut, the bearing positioning ring and the rear guide sleeve are respectively contacted with one end of a deep groove ball bearing outer ring and form effective limiting, the locking nut is contacted with the rear guide sleeve and forms limiting, the rear guide sleeve and the locking nut form a split structure, the split structure is convenient to mount and dismount and is maintained in the later period, the inner ring positioning assembly comprises a limiting unit and a stepped structure arranged on a transmission shaft, the limiting unit is connected with the transmission shaft, the limiting unit and the stepped structure are respectively contacted with one end of the deep groove ball bearing inner ring and form effective limiting, a bearing thrust sealing ring is omitted, a sealing groove is also omitted, the risk of oil leakage is greatly reduced, the manufacturing and maintaining cost of an actuator is also reduced, and the product structure is simplified.

Description

Bearing positioning structure for spiral hydraulic actuator

Technical Field

The utility model relates to the technical field of spiral hydraulic actuators, in particular to a bearing positioning structure for a spiral hydraulic actuator.

Background

The action principle of the spiral hydraulic actuator is that hydraulic power oil is loaded on the section of a spiral piston through relative movement between two groups of large-helix angle spiral pairs in a hydraulic shell, the piston is driven to rotate, and thrust loaded on the piston is converted into shaft (flange) torque and angle output rotation through the inner spiral pairs. Because the large helix angle and the integral gear engagement are adopted, compared with the vane type and the gear rack type, the structure is compact, and the characteristics of higher torque output, high bearing capacity, shock resistance, zero leakage, flexible installation and the like can be realized. The rotary swing type hydraulic actuator is widely applied to industries such as valve control, engineering machinery, automatic control, ships, agricultural machinery, instruments and meters and the like at present, and is suitable for being applied under the working condition that the installation space is limited, so that the rotary swing of the actuator is realized.

Because of the structural characteristics of the spiral swinging cylinder, a thrust friction gasket or a thrust bearing is commonly used in the market at present as a transmission element, thrust load generated in the operation process is transmitted to the thrust friction plate or the thrust bearing, lubricating grease is required to be added to ensure the normal action of a spiral hydraulic actuator in the use process of the thrust friction plate, regular maintenance is required, difficulty is increased in field maintenance, the thrust bearing is conventionally used for thrust ball bearings or thrust needle roller bearings, under the heavy load application working condition, all axial loads are born by the thrust bearing, the service life of the bearing is shortened or the bearing is directly damaged, the type of the thrust bearing is less, the domestic thrust bearing bears thrust load which is not as good as that of an imported bearing, the cost is increased by selecting the imported bearing, the domestic bearing is often selected to be a large grade bearing, the overall dimension of the product is increased, the two structural modes have lower transmission efficiency, the starting pressure is larger in the operation process of the actuator, and the pressure loss is large and the internal heating of the actuator is serious.

The present inventors found that there are at least the following technical problems in the prior art: the deep groove ball bearing can obtain a good effect, but when the existing deep groove ball bearing is used, the outer ring of the bearing lacks a positioning locking adjustment structure, and only reasonable matching precision can be obtained through machining precision, so that the bearing can move inside a cylinder body due to overlarge matching precision, an output angle can be changed, and the service life of the bearing can be shortened or damage can be directly caused due to overlarge locking force of the bearing due to overlarge matching precision; the bearing inner race location adopts the bearing thrust sealing ring, sets up screw thread and sealing washer in the bearing thrust sealing ring, owing to self compact structure, the bearing thrust sealing ring does not have locking locate function, can take place not hard up risk under the frequent operating mode of vibration or action, leads to the bearing to take place to shift, influences the normal work of executor, and has the operating mode of impact to probably lead to inside spare part damage.

Disclosure of Invention

The utility model aims to provide a bearing positioning structure for a spiral hydraulic actuator, which aims to solve the technical problem that a deep groove ball bearing is lack of good positioning in the spiral hydraulic actuator in the prior art. The preferred technical solutions of the technical solutions provided by the present utility model can produce a plurality of technical effects described below.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the bearing positioning structure for the spiral hydraulic actuator comprises a cylinder body, a spiral piston, a transmission shaft, a deep groove ball bearing, an outer ring positioning assembly and an inner ring positioning assembly;

the outer ring positioning assembly comprises a bearing positioning ring, a rear guide sleeve and a lock nut, wherein the bearing positioning ring and the rear guide sleeve are respectively contacted with one end of the outer ring of the deep groove ball bearing and form a limit, one end of the bearing positioning ring away from the deep groove ball bearing is contacted with the spiral piston, the outer side of the lock nut is connected with the cylinder body, and the inner side and the end of the lock nut are contacted with one end of the rear guide sleeve away from the deep groove ball bearing and form a limit;

the inner ring positioning assembly comprises a limiting unit and a step structure arranged on the transmission shaft, the limiting unit is connected with the transmission shaft, and the limiting unit and the step structure are respectively contacted with one end of the inner ring of the deep groove ball bearing and form limiting.

Preferably, the limiting unit comprises a bearing circlip, a mounting groove is formed in the transmission shaft, and the bearing circlip is mounted in the mounting groove and is in contact with the inner ring of the deep groove ball bearing.

Preferably, the limiting unit comprises a locking nut and a set screw, wherein the locking nut is sleeved on the transmission shaft and is in contact with the inner ring of the deep groove ball bearing, and the locking nut is connected to the transmission shaft by a plurality of set screws.

Preferably, an external thread is arranged on the outer side of the lock nut, an internal thread is arranged on the cylinder body at a corresponding position of the lock nut, and the lock nut is in threaded connection with the cylinder body.

Preferably, the novel transmission shaft comprises a transmission shaft, a first mounting groove is formed in the inner side of the rear guide sleeve, the guide ring is mounted in the first mounting groove, and the inner side of the guide ring is in contact with the transmission shaft.

Preferably, the rear guide sleeve further comprises a shaft sealing ring, a second mounting groove is formed in the inner side of the rear guide sleeve, the shaft sealing ring is mounted in the second mounting groove, and the inner side of the shaft sealing ring is in contact with the transmission shaft.

Preferably, the novel anti-dust device further comprises a dust ring, wherein a third mounting groove is formed in the inner side of the rear guide sleeve, the dust ring is mounted in the third mounting groove, and the inner side of the dust ring is in contact with the transmission shaft.

Preferably, the device also comprises a sealing ring for holes, a fourth mounting groove is arranged on the outer side of the rear guide sleeve, the sealing ring for the hole is arranged in the fourth mounting groove, and the outer side of the sealing ring for the hole is in contact with the cylinder body.

The beneficial effects of the utility model are as follows: the bearing positioning ring and the rear guide sleeve are respectively contacted with one end of the outer ring of the deep groove ball bearing and form a limit, and are matched together to limit the working stroke of the spiral piston and effectively position the outer ring of the deep groove ball bearing;

the rear guide sleeve and the locking nut form a split structure, so that the assembly and the disassembly are convenient, the later maintenance are convenient, the locking nut locks and positions the outer ring of the deep groove ball bearing, the rear guide sleeve can be locked and positioned at the same time, the rear guide sleeve is prevented from being separated under the state of pressure oil, and the proper locking force can be adjusted through the locking nut so as to ensure the optimal working state of the actuator;

the limiting unit and the step structure are respectively contacted with one end of the inner ring of the deep groove ball bearing and form limiting, the limiting unit and the step structure are mutually matched to effectively position the inner ring of the deep groove ball bearing, a bearing thrust sealing ring is omitted, a sealing groove is also omitted, the risk of oil leakage is greatly reduced, the manufacturing and maintenance cost of the actuator is also reduced, and the product structure is simplified.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of a second embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a third embodiment of the present utility model;

1, a cylinder body in the figure;

2. a screw piston;

3. a transmission shaft; 31. a step structure;

4. deep groove ball bearings;

5. a bearing positioning ring;

6. a rear guide sleeve; 61. a guide ring; 62. sealing rings for shafts; 63. a dust ring; 64. a sealing ring for the hole;

7. a lock nut;

81. a bearing circlip; 82. locking a back-to-back; 83. and (5) setting the screw.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, based on the examples herein, which are within the scope of the utility model as defined by the claims, will be within the scope of the utility model as defined by the claims.

In the description of the present utility model, it should be understood that the terms "center", "side", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in fig. 1 are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model can be understood as appropriate by those of ordinary skill in the art.

Example 1

Referring to fig. 1 and 2, the utility model provides a bearing positioning structure for a screw type hydraulic actuator, which comprises a cylinder body 1, a screw piston 2, a transmission shaft 3 and a deep groove ball bearing 4, wherein the inner side of the cylinder body 1 is provided with inner screw teeth, the outer side of the screw piston 2 is provided with outer screw teeth, the cylinder body 1 is meshed with the screw piston 2, the inner side of the screw piston 2 is provided with inner screw teeth, the outer side of the transmission shaft 3 is provided with outer screw teeth, the screw piston 2 is meshed with the transmission shaft 3, the screw directions of two groups of screw teeth are opposite, the screw teeth of the two groups of screw teeth with different screw directions are matched with each other, the pressure of a hydraulic source in the cylinder body is converted into set angle output and torque output through the screw rotation of the screw piston 2, and the deep groove ball bearing 4 is arranged on the cylindrical surface of the transmission shaft 3;

the bearing positioning structure also comprises an outer ring positioning assembly and an inner ring positioning assembly;

the outer ring positioning assembly comprises a bearing positioning ring 5, a rear guide sleeve 6 and a lock nut 7, wherein the bearing positioning ring 5 is arranged in the cylinder body 1, the rear guide sleeve 6 is arranged at the end part of the cylinder body 1, the bearing positioning ring 5 and the rear guide sleeve 6 are respectively contacted with one end of the outer ring of the deep groove ball bearing 4 and form limit, one end of the bearing positioning ring 5 far away from the deep groove ball bearing 4 is contacted with the spiral piston 2, and the bearing positioning ring 5 and the rear guide sleeve 6 are matched together and used for limiting the working stroke of the spiral piston 2 and effectively positioning the outer ring of the deep groove ball bearing 4;

the outer side of the lock nut 7 is connected with the cylinder body 1, the inner side and the end part of the lock nut 7 are contacted with one end of the rear guide sleeve 6 far away from the deep groove ball bearing 4 and form a limit, the rear guide sleeve 6 and the lock nut 7 form a split structure, the assembly, the disassembly and the later maintenance are convenient, the lock nut 7 locks and positions the outer ring of the deep groove ball bearing 4, the rear guide sleeve 6 can be locked and positioned at the same time, the rear guide sleeve is prevented from falling off under the state of pressure oil, and the proper locking force can be adjusted through the lock nut 7 so as to ensure the optimal working state of the actuator;

the inner ring positioning assembly comprises a limiting unit 8 and a stepped structure 31 arranged on the transmission shaft 3, the limiting unit is connected with the transmission shaft 3, the limiting unit and the stepped structure 31 are respectively contacted with one end of the inner ring of the deep groove ball bearing 4 and form limiting, the limiting unit and the stepped structure 31 are mutually matched, the inner ring of the deep groove ball bearing 4 is effectively positioned, a bearing thrust sealing ring is omitted, a sealing groove is also omitted, the risk of oil leakage is greatly reduced, the manufacturing and maintenance cost of an actuator is also reduced, and the product structure is simplified;

the bearing positioning structure applies the axial load transmitted by the spiral piston 2 to the end face of the bearing positioning ring 5 through the optimization of the structure, the influence of the axial load is eliminated through the bearing positioning ring 5 and the outer ring of the deep groove ball bearing 4, and at the moment, the best working state of the actuator can be met only by checking the strength of the outer ring of the deep groove ball bearing 4 to select a proper bearing model, and the sliding element in the deep groove ball bearing 4 can be ensured to be in a normal working state because the transmission shaft 3 is normally used without the axial load;

the deep groove ball bearing 4 structure is adopted, so that the axial force applied to the bearing by pressurization of the actuator in the working process and at the limit positions of the two ends is eliminated, the dynamic and static starting pressure of the actuator is effectively reduced, the high-frequency high-speed dynamic requirement can be met by more sensitive operation, and the phenomena of action lag and the like of the conventional hydraulic oil input actuator are eliminated.

As an alternative implementation manner, the contact surfaces of the lock nut 7 and the rear guide sleeve 6 are smooth surfaces, external threads are arranged on the outer sides of the lock nut 7, internal threads are arranged on corresponding positions of the lock nut 7 on the cylinder body 1, the lock nut 7 and the cylinder body 1 form threaded connection, so that the outer ring of the deep groove ball bearing 4 is locked and positioned, the rear guide sleeve 6 is locked and positioned, and the locking force can be adjusted by adjusting the lock nut 7, so that the best working state of the actuator is ensured.

As an alternative embodiment, the rear guide sleeve 6 further comprises a guide ring 61, the inner side of the rear guide sleeve 6 is provided with a first mounting groove, the guide ring 61 is mounted in the first mounting groove, the inner side of the guide ring 61 is in contact with the transmission shaft 3, and the guide ring 61 can play a good guide role.

As an alternative embodiment, the rear guide sleeve 6 further comprises a shaft sealing ring 62, the inner side of the rear guide sleeve 6 is provided with a second mounting groove, the shaft sealing ring 62 is mounted in the second mounting groove, the inner side of the shaft sealing ring 62 is in contact with the transmission shaft 3, and the shaft sealing ring 62 can play a good sealing role.

As an alternative embodiment, the novel anti-dust device further comprises a dust ring 63, a third mounting groove is formed in the inner side of the rear guide sleeve 6, the dust ring 63 is mounted in the third mounting groove, the inner side of the dust ring 63 is in contact with the transmission shaft 3, and the dust ring 63 can play a good role in dust prevention.

As an alternative embodiment, the device further comprises a hole sealing ring 64, a fourth mounting groove is formed in the outer side of the rear guide sleeve 6, the hole sealing ring 64 is mounted in the fourth mounting groove, the outer side of the hole sealing ring 64 is in contact with the cylinder body 1, and the hole sealing ring 64 can play a good sealing role.

Example two

Referring to fig. 1, on the basis of the first embodiment, as an alternative implementation manner, the limiting unit includes a bearing circlip 81, a mounting groove is formed on the transmission shaft 3, and the bearing circlip 81 is mounted in the mounting groove and contacts with the inner ring of the deep groove ball bearing 4;

the bearing circlip 81 can be matched with the stepped structure 31 arranged on the transmission shaft 3, the inner ring of the deep groove ball bearing 4 is positioned, an integrated structure is adopted, a bearing thrust ring is omitted, a sealing groove is omitted, the risk of oil leakage is greatly reduced, the manufacturing and maintenance cost of an actuator is reduced, and the product structure is simplified.

Example III

Referring to fig. 2, in the first embodiment, as an alternative implementation manner, the limiting unit includes a locking nut 82 and a set screw 83, the locking nut 82 is sleeved on the transmission shaft 3 and contacts with the inner ring of the deep groove ball bearing 4, and a plurality of set screws 83 connect the locking nut 82 to the transmission shaft 3;

during specific installation, the inner ring of the deep groove ball bearing 4 is positioned through the locking nut 82, the set screw 83 is installed in threaded holes of the locking nut 82 and the transmission shaft 3 after the deep groove ball bearing 4 is positioned and locked, and the bearing is installed to a proper position through the combination of the locking nut 82 and the set screw 83;

the combined structure of the locking back nut 82 and the set screw 83 is matched with the stepped structure 31 arranged on the transmission shaft 3, the inner ring of the deep groove ball bearing 4 is positioned, an integrated structure is adopted, a bearing thrust ring is omitted, a sealing groove is omitted, the risk of oil leakage is greatly reduced, the manufacturing and maintenance cost of an actuator is reduced, and the product structure is simplified.

The foregoing is merely illustrative embodiments of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present utility model, and the utility model should be covered. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (8)

1. The bearing positioning structure for the spiral hydraulic actuator comprises a cylinder body (1), a spiral piston (2), a transmission shaft (3) and a deep groove ball bearing (4), and is characterized by further comprising an outer ring positioning assembly and an inner ring positioning assembly;

the outer ring positioning assembly comprises a bearing positioning ring (5), a rear guide sleeve (6) and a lock nut (7), wherein the bearing positioning ring (5) and the rear guide sleeve (6) are respectively contacted with one end of an outer ring of the deep groove ball bearing (4) and form a limit, one end of the bearing positioning ring (5) away from the deep groove ball bearing (4) is contacted with the spiral piston (2), the outer side of the lock nut (7) is connected with the cylinder body (1), and the inner side and the end of the lock nut (7) are contacted with one end of the rear guide sleeve (6) away from the deep groove ball bearing (4) and form a limit;

the inner ring positioning assembly comprises a limiting unit and a step structure (31) arranged on the transmission shaft (3), the limiting unit is connected with the transmission shaft (3), and the limiting unit and the step structure (31) are respectively contacted with one end of the inner ring of the deep groove ball bearing (4) and form limiting.

2. Bearing positioning structure for a screw-type hydraulic actuator according to claim 1, characterized in that the limit unit comprises a bearing circlip (81), the drive shaft (3) is provided with a mounting groove, and the bearing circlip (81) is mounted in the mounting groove and is in contact with the inner ring of the deep groove ball bearing (4).

3. The bearing positioning structure for a screw-type hydraulic actuator according to claim 1, wherein the limiting unit comprises a locking nut (82) and a set screw (83), the locking nut (82) is sleeved on the transmission shaft (3) and is in contact with an inner ring of the deep groove ball bearing (4), and a plurality of set screws (83) connect the locking nut (82) to the transmission shaft (3).

4. Bearing positioning structure for a screw-type hydraulic actuator according to claim 1, characterized in that the outside of the lock nut (7) is provided with an external thread, the cylinder (1) is provided with an internal thread at a corresponding position of the lock nut (7), and the lock nut (7) is in threaded connection with the cylinder (1).

5. The bearing positioning structure for a screw-type hydraulic actuator according to claim 1, further comprising a guide ring (61), wherein a first mounting groove is provided on the inner side of the rear guide sleeve (6), the guide ring (61) is mounted inside the first mounting groove, and the inner side of the guide ring (61) is in contact with the transmission shaft (3).

6. The bearing positioning structure for a screw-type hydraulic actuator according to claim 1, further comprising a shaft seal ring (62), wherein a second mounting groove is provided on the inner side of the rear guide bush (6), the shaft seal ring (62) is mounted inside the second mounting groove, and the inner side of the shaft seal ring (62) is in contact with the transmission shaft (3).

7. The bearing positioning structure for a screw-type hydraulic actuator according to claim 1, further comprising a dust ring (63), wherein a third mounting groove is provided on the inner side of the rear guide bush (6), the dust ring (63) is mounted inside the third mounting groove, and the inner side of the dust ring (63) is in contact with the transmission shaft (3).

8. The bearing positioning structure for a screw-type hydraulic actuator according to claim 1, further comprising a hole seal ring (64), wherein a fourth mounting groove is provided on the outer side of the rear guide bush (6), the hole seal ring (64) is mounted inside the fourth mounting groove, and the outer side of the hole seal ring (64) is in contact with the cylinder (1).