CN218377125U

CN218377125U - Hydraulic actuator

Info

Publication number: CN218377125U
Application number: CN202222511699.0U
Authority: CN
Inventors: 许顺海; 邹振保; 呼瑞红; 马魁; 李泽魁; 白林迎; 刘尚
Original assignee: China Railway Engineering Equipment Group Co Ltd CREG
Current assignee: China Railway Engineering Equipment Group Co Ltd CREG
Priority date: 2022-09-22
Filing date: 2022-09-22
Publication date: 2023-01-24
Anticipated expiration: 2032-09-22

Abstract

The utility model discloses a hydraulic actuator has solved the problem that the contact ratio of rack and pinion swing pneumatic cylinder flank of tooth is low among the prior art. The technical scheme of the utility model is realized like this: a hydraulic actuator comprises a cylinder body, wherein a rack and a gear which are matched with each other are arranged in the cylinder body and are meshed through helical teeth; the both ends of rack all are equipped with the piston, and the piston is located the sealed oil cavity that the cylinder body corresponds, be equipped with the bolster on the piston. The utility model discloses a gear, rack skewed tooth design, preferably V type skewed tooth design have reached the effect that increases the meshing contact ratio, have improved the bearing capacity of gear, have reduced the structure of executor that surges. The double-buffer structure improves the reliability of the hydraulic actuator, improves the working efficiency of the hydraulic actuator and prolongs the service life of the hydraulic actuator.

Description

Hydraulic actuator

Technical Field

The utility model relates to a rack and pinion pneumatic cylinder technical field especially indicates a hydraulic actuator.

Background

The hydraulic actuator is widely used in occasions with large torque and small rotation angle, is applied to various mechanical equipment, and can be divided into three types, namely a rack and pinion type hydraulic cylinder, a blade type hydraulic cylinder and a spiral hydraulic cylinder according to the category of the hydraulic cylinder, wherein the rack drives a gear to convert the reciprocating motion of the hydraulic cylinder into forward and reverse swinging rotation of a gear shaft, and simultaneously, the thrust of the reciprocating cylinder is converted into the output torque of the gear shaft.

The existing gear rack swing hydraulic cylinder is as disclosed: the novel hydraulic transformer electrohydraulic control mechanism of CN 102155474A adopts straight-toothed racks and gear racks, and in some occasions, the output torque of the gear shaft is large, and a larger straight-toothed rack and gear rack have to be selected to ensure the strength, so that the volume of the increased hydraulic actuator is increased, and in some occasions, a larger torque needs to be output but only a smaller installation volume is needed. In addition, the existing gear rack swing hydraulic cylinder has poor buffering effect in rack movement, and further the service life of the hydraulic cylinder is influenced. Therefore, it is necessary to design a hydraulic actuator with good engagement performance, large output torque, smaller size and long service life.

SUMMERY OF THE UTILITY MODEL

Not enough to in the above-mentioned background art, the utility model provides a hydraulic actuator has solved the problem that the contact ratio is low of rack and pinion swing hydraulic cylinder flank of tooth among the prior art.

The technical scheme of the utility model is realized like this: a hydraulic actuator comprises a cylinder body, wherein a rack and a gear which are matched with each other are arranged in the cylinder body, and the rack and the gear are meshed through helical teeth; the two ends of the rack are both provided with pistons, the pistons are located in the sealed oil cavities corresponding to the cylinder bodies, and the pistons are provided with buffer pieces.

Further, the bolster includes the buffer block, and the buffer block is spacing on the piston through the buffering end cover, and buffer block and buffering end cover sliding connection, be equipped with the bolster between buffer block and rack or the piston.

Further, establish the ladder groove in the buffer block, the ladder groove communicates with the through-hole of setting on the buffer block lateral wall, and the bolster is buffer spring, and buffer spring's one end and ladder groove cooperation, the other end are connected in the mounting groove of seting up on the rack.

Further, the stepped groove forms a small oil cavity, and the small oil cavity is communicated with the sealed oil cavity through the through hole.

As another embodiment, the buffer member is a disc spring, and the disc spring is disposed between the buffer block and the rack or the piston. The buffer piece can also adopt a rubber elastic piece or a spring piece arranged between the buffer block and the buffer end cover, and the buffer block can be ensured to move and buffer after being stressed.

Further, the cylinder body includes cylinder and the cylinder cap that is used for sealed cylinder, is equipped with the fluting that supplies gear and rack to mesh on the lateral wall of cylinder, and the gear passes through casing sealing connection in the cylinder, the casing passes through the flange to be fixed on the cylinder.

Preferably, the gear is a gear shaft, and the tooth profile of the gear shaft is a V-shaped helical tooth. The cross section of the rack is a semicircular surface formed by a horizontal chord and a major arc, and the horizontal plane of the rack is provided with V-shaped helical teeth meshed with the gear. The piston is of a circular boss structure, and the circular boss structure is fixedly connected with the rack in a sealing mode.

The utility model has the advantages as follows: compared with the prior art, the utility model discloses a gear, rack skewed tooth design, preferably V type skewed tooth design have reached the effect that increases the meshing contact ratio, have improved the bearing capacity of gear, have reduced the structure of executor that surges. The double-buffer design on the pistons at the two ends ensures that the pressure of the small oil cavity of the rack is equal to that of the large oil cavity due to the through hole design of the buffer block on the low-pressure side, and the buffer block can lean against the outer side due to the pressure difference between the two sides of the buffer block and the compression elasticity of the spring. When the rack moves to the state that the buffer block is contacted with the cylinder bottom, the buffer block moves towards the inner side, the pressure of the low-pressure cavity rises, the pressure difference of the large oil cavities on the two sides is reduced, and the effect of buffering the rack is achieved. At the moment, the compression force of the spring effectively reduces the force of the rack colliding with the cylinder bottom, so that the effect of buffering the rack is achieved, and the structure can achieve the double buffering effect. The double-buffer structure improves the reliability of the hydraulic actuator, improves the working efficiency of the hydraulic actuator and prolongs the service life of the hydraulic actuator.

Drawings

In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive work.

Fig. 1 is the internal structure diagram of the hydraulic actuator of the present invention.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a schematic view of the gear structure of the present invention.

Fig. 4 is a schematic view of the rack structure of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.

As shown in fig. 1, embodiment 1 is a hydraulic actuator including a cylinder 2, which is a sealed cylinder. A rack 7 and a gear 10 which are matched with each other are arranged in the cylinder body 2, the rack 7 and the gear 10 are meshed through helical teeth, and the helical teeth are meshed to increase the meshing contact ratio of the tooth surfaces; the bearing capacity of the gear is improved, the reliability of the hydraulic actuator is improved, and the working efficiency of the hydraulic actuator is improved. And pistons 6 are arranged at two ends of the rack 7, the pistons 6 are positioned in the sealed oil cavities 14 at two corresponding sides of the cylinder body 2, and the sealed oil cavities 14 are large oil cavities of the cylinder body. Each piston 6 is provided with a buffer part used for buffering the force between the piston and the cylinder body, and the double-buffer structure design prolongs the service life of the rack.

In this embodiment the bolster includes buffer block 3, and buffer block 3 is spacing on piston 6 through buffering end cover 5, and buffer block 3 and 5 sliding connection of buffering end cover, and the buffer block can carry out the floating motion about relative rack under the effect of bolster, and the power of buffering piston reduces unnecessary impact force, guarantees the stationarity of rack and piston motion, prolongs its life. And a buffer 4 is arranged between the buffer block 3 and the rack 7 or the piston 6. The buffer piece can be arranged between the buffer block and the rack, and also can be arranged between the buffer block and the piston, and according to specific structural design, the buffer block can move relative to the rack or the piston.

Embodiment 2, as shown in fig. 2, on the basis of embodiment 1 establish ladder groove 11 in buffer block 3, ladder groove 11 and the through-hole 12 that sets up on the buffer block 3 lateral wall communicate, ladder groove 11 forms the small oil pocket, and the small oil pocket is linked together through-hole 12 and sealed oil pocket 14. The buffer 4 is a buffer spring, one end of the buffer spring is matched with the stepped groove 11, and the other end of the buffer spring is connected in a mounting groove 13 formed in the rack 7. The through hole enables an inner cavity (a small oil cavity) of the buffer block 3 to be communicated with a large oil cavity of the cylinder body. When the rack 7 is subjected to high-low pressure difference reciprocating motion of a left large oil cavity and a right large oil cavity, before the buffer block 3 touches the cylinder bottom (the cylinder cover 201), the pressure of the small oil cavity of the rack 7 is equal to that of the large oil cavity due to the through hole design of the buffer block 3, and the buffer block 3 can lean against the outer side due to the pressure difference between two sides of the buffer block 3 and the compression elasticity of the buffer piece 4. When the rack 7 moves to the state that the buffer block 3 is contacted with the cylinder bottom (the cylinder cover 201), the buffer block 3 moves inwards, the pressure of the low-pressure cavity rises, the pressure difference of the large oil cavities on the two sides is reduced, and the effect of buffering the rack 7 is achieved. At the moment, the compression force of the spring effectively reduces the force of the rack 7 colliding with the cylinder bottom 1, so that the effect of buffering the rack 7 is achieved, and therefore the structure can achieve the double buffering effect.

Embodiment 3, this embodiment is different from embodiment 2 in that the buffer member 4 is a disc spring, and the disc spring is disposed between the buffer block 3 and the rack 7 or the piston 6. In addition, the buffer part can also adopt a rubber elastic part or a spring part arranged between the buffer block 3 and the buffer end cover 5, and the buffer part can be ensured to buffer the motion of the buffer block after being stressed.

In this embodiment, the cylinder 2 includes a cylinder 202 and a cylinder cover 201 for sealing the cylinder 202, a slot 15 for engaging the gear 10 with the rack 7 is provided on a side wall of the cylinder 202, and the opening degree of the slot is determined without affecting the rotation of the gear and the movement of the rack. In the embodiment, the gear 10 is hermetically connected in the cylinder 202 through the housing 9, and the tightness of the rack and the gear is ensured. The shell 9 is fixed on the cylinder 202 through the flange 8, and the shell is fixedly and hermetically connected with the cylinder.

Preferably, as shown in fig. 3 and 4, the gear 10 is a gear shaft, and the tooth profile of the gear shaft is a V-shaped helical tooth. The cross section of the rack 7 is a semicircular surface formed by a horizontal chord and a major arc, namely the rack is a cylinder with a plane, the horizontal plane of the rack 7 is provided with V-shaped helical teeth meshed with the gear 10, namely the gear 10 and the rack 7 form V-shaped helical teeth meshing, the effect of increasing the meshing coincidence degree is achieved, the bearing capacity of the gear is improved, the structure is more compact, and the installation volume of the hydraulic actuator is reduced. The piston 6 is of a circular boss structure so as to be in sealing fit with the cylindrical cylinder 202, and the circular boss structure is fixedly connected with the rack 7 in a sealing mode, so that the piston can move synchronously along with the rack.

In addition, the quantity of rack and pinion also can set up a plurality ofly as required, and the synchronism of its motion is guaranteed to a plurality of rack and pinion, improves the bearing capacity of gear, increases output torque. The skewed tooth can adopt V type skewed tooth also can adopt the skewed tooth design of other forms as required, and the skewed tooth that can realize increase meshing degree all is in the protection range of this application.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic actuator, comprising a cylinder (2), characterized in that: a rack (7) and a gear (10) which are matched with each other are arranged in the cylinder body (2), and the rack (7) is meshed with the gear (10) through helical teeth; both ends of rack (7) all are equipped with piston (6), and piston (6) are located sealed oil pocket (14) that cylinder body (2) correspond, be equipped with the bolster on piston (6).

2. The hydraulic actuator of claim 1, wherein: the buffer piece comprises a buffer block (3), the buffer block (3) is limited on a piston (6) through a buffer end cover (5), the buffer block (3) is connected with the buffer end cover (5) in a sliding mode, and a buffer piece (4) is arranged between the buffer block (3) and a rack (7) or the piston (6).

3. The hydraulic actuator according to claim 2, wherein: establish ladder groove (11) in buffer block (3), ladder groove (11) and through-hole (12) intercommunication of setting on buffer block (3) lateral wall, bolster (4) are buffer spring, and buffer spring's one end and ladder groove (11) cooperation, the other end are connected in installation groove (13) of seting up on rack (7).

4. The hydraulic actuator according to claim 3, wherein: the stepped groove (11) forms a small oil cavity, and the small oil cavity is communicated with the sealed oil cavity (14) through the through hole (12).

5. The hydraulic actuator of claim 2, wherein: the buffer piece (4) is a disc spring which is arranged between the buffer block (3) and the rack (7) or the piston (6).

6. The hydraulic actuator according to any one of claims 1 to 5, characterized in that: the cylinder body (2) comprises a cylinder barrel (202) and a cylinder cover (201) used for sealing the cylinder barrel (202), a slot (15) for meshing the gear (10) and the rack (7) is formed in the side wall of the cylinder barrel (202), the gear (10) is connected in the cylinder barrel (202) in a sealing mode through a shell (9), and the shell (9) is fixed on the cylinder barrel (202) through a flange (8).

7. The hydraulic actuator of claim 6, wherein: the gear (10) is a gear shaft, and the tooth form of the gear shaft is V-shaped helical teeth.

8. The hydraulic actuator of claim 7, wherein: the cross section of the rack (7) is a semicircular surface formed by a horizontal chord and a major arc, and V-shaped helical teeth meshed with the gear (10) are arranged on the horizontal plane of the rack (7).

9. The hydraulic actuator according to claim 7 or 8, wherein: the piston (6) is of a circular boss structure, and the circular boss structure is fixedly connected with the rack (7) in a sealing mode.