Anti-rotation locking structure of cylinder shifting fork

Abstract

The utility model discloses an anti-rotation locking structure of a cylinder shifting fork, which reliably completes anti-rotation locking of the shifting fork and a piston shaft when only an axially operable space exists, avoids the loosening risk caused by incapability of locking, and simultaneously avoids the early assembly abrasion risk of a sealing ring caused by the fact that the piston shaft rotates to drive the sealing ring to rotate. The cylinder body comprises a cylinder shell and a cylinder end cover; the piston shaft comprises a sealing ring end and a shaft body, and the shaft body is eccentrically arranged on the end face of the sealing ring end and protrudes outwards towards the air cylinder end cover; a linear spring; the shifting fork comprises a sleeve connecting end and a shifting fork end; a fastening bolt; and a positioning pin.

Description

Technical Field

[0001] The utility model relates to the technical field of a cylinder fork mechanism, in particular to an anti-rotation locking structure for a cylinder fork. Background Art

[0002] A cylinder shift actuator includes a cylinder, a piston shaft, a fork, and a locking structure. Under the action of air pressure, the cylinder piston drives the fork to move to achieve a shifting action. In the prior art, the conventional structure for locking the fork to the piston shaft is a radial pin or a radial screw; this method can only operate radially in the locking direction. When there is only axial operating space for shifting, the existing radial connection structure cannot achieve the locking of the fork to the piston shaft.

[0003] In addition, in the prior art, the fork and the piston shaft are locked together by an axial bolt. In the existing conventional locking method, the bolt drives the internal piston shaft to rotate together through the friction force of the thread pair, and it is impossible to confirm whether the fork is locked, there is a risk of loosening. At the same time, when the piston shaft rotates, the sealing ring on the piston rotates axially, there is a risk of early assembly wear. Summary of the Invention

[0004] In view of the above problems, the utility model provides an anti-rotation locking structure for a cylinder fork, which can reliably complete the anti-rotation locking of the fork and the piston shaft when there is only axial operating space, avoid the risk of loosening that cannot be locked, and at the same time avoid the risk of early assembly wear of the sealing ring caused by the rotation of the piston shaft driving the sealing ring to rotate.

[0005] An anti-rotation locking structure for a cylinder fork, characterized in that it includes:

[0006] A cylinder block, which includes a cylinder housing and a cylinder end cover;

[0007] A piston shaft, which includes a seal ring end and a shaft body, the shaft body is eccentrically arranged on the end face of the seal ring end and protrudes outward towards the cylinder end cover;

[0008] A linear spring;

[0009] A fork, which includes a sleeve connection end and a fork end;

[0010] A fastening bolt;

[0011] And a positioning pin;

[0012] The cylinder end cover fixing cover is installed on the exposed end face of the cavity of the cylinder housing. A piston shaft through hole is provided on the cylinder end cover. The outer convex end of the shaft body penetrates through the piston shaft through hole and then protrudes outwards. The sleeve connection end is tightly sleeved on the outer circumference of the outer convex end of the shaft body. The outer circumference of the outer convex end of the shaft body and the annular wall of the sleeve connection end form at least one positioning pin installation cavity. The positioning pin is plugged into the positioning pin installation cavity. The threaded end of the fastening bolt is threadedly connected to the axial threaded hole of the outer convex end of the shaft body, and the head of the fastening bolt presses against the exposed end face of the sleeve connection end. The linear spring is sleeved on the piston shaft at the axial position within the cavity. One end of the linear spring presses against the end face of the sealing ring end away from the air cavity. The air cavity is externally connected to external pressurized gas through a pipeline.

[0013] Its further features are as follows:

[0014] A sleeve stop is further provided at the exposed end of the shaft body. The inner end face of the sleeve connection end closely adheres to the sleeve stop, and the axial fastening of the sleeve connection end is completed by pressing with the head of the fastening bolt.

[0015] The number of the positioning pins is one. The outer circumference of the outer convex end of the shaft body and the annular wall of the sleeve connection end form a positioning pin installation cavity. One positioning pin can ensure that the fork does not rotate and become loose.

[0016] The positioning pin is a cylindrical pin. A semi-circular hole is formed on the outer circumference of the outer convex end of the shaft body and the annular wall of the sleeve connection end respectively. The cylindrical pin is inserted into the circular hole formed by the combination of the two semi-circular holes to complete the locking connection.

[0017] A sealing ring is further embedded in the thickness direction of the sealing ring end. The sealing ring is arranged closely against the corresponding annular wall of the cavity to ensure airtight operation.

[0018] The cylinder end cover is fixedly installed on the exposed end face of the cavity of the cylinder housing through circumferentially arranged cylinder bolts.

[0019] After adopting the structure of the present utility model, the sleeve connection end of the fork is axially sleeved onto the outer convex end of the shaft body. The cylindrical pin holes on the outer ring surfaces of the sleeve connection end and the outer convex end of the shaft body are aligned to form an integral positioning pin installation cavity. The positioning pin is plugged into the positioning pin installation cavity to connect the fork and the piston shaft together. After the position of the fork end is installed in place, the fastening bolt is threadedly connected and inserted into the axial threaded hole of the outer convex end of the shaft body. The fastening bolt clamps the fork on the piston shaft to achieve anti-rotation locking of the cylinder fork. When there is only axially operable space, it can reliably complete the anti-rotation locking of the fork and the piston shaft, avoiding the risk of loosening that cannot be locked, and at the same time avoiding the risk of early assembly wear of the sealing ring caused by the rotation of the piston shaft driving the sealing ring to rotate. Description of the Drawings

[0020] Figure 1 The schematic diagram of the front view cross-section of the present utility model;

[0021] Figure 2 The schematic diagram of the side view structure of the present utility model (removing the fastening bolts);

[0022] The names corresponding to the serial numbers in the figure are as follows:

[0023] Cylinder block 10, piston shaft 20, seal ring end 21, sealing ring 211, shaft body 22, axial threaded hole 221, sleeve stop 222, linear spring 30, fork 40, sleeve connection end 41, fork end 42, fastening bolt 50, threaded end 51, head 52, positioning pin 60, cylinder housing 70, cavity 71, air chamber 72, cylinder end cover 80, piston shaft through hole 81, positioning groove 82, positioning pin installation cavity 90, cylinder bolt 100. Specific embodiments

[0024] It should be noted that, without conflict, the embodiments and features in the embodiments of the present utility model can be combined with each other.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0026] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.

[0027] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0028] A cylinder fork anti-rotation locking structure, see Figure 1 and Figure 2, which includes a cylinder block 10, a piston shaft 20, a linear spring 30, a fork 40, a fastening bolt 50, and a positioning pin 60;

[0029] The cylinder block 10 includes a cylinder housing 70 and a cylinder end cover 80. The cylinder end cover 80 is fixedly installed on the exposed end face of the cavity 71 of the cylinder housing 70. There is a piston shaft through-hole 81 on the cylinder end cover 80, and a positioning groove 82 for the linear spring 30 is also provided on the inner wall of the cylinder end cover 80;

[0030] The piston shaft 20 includes a sealing ring end 21 and a shaft body 22. The shaft body 22 is eccentrically arranged on the end face of the sealing ring end 21 and protrudes outward towards the cylinder end cover 80;

[0031] The fork 40 includes a sleeve connection end 41 and a fork end 42.

[0032] During specific implementation, the positioning pin 60 is a cylindrical pin;

[0033] The protruding end of the shaft body 22 passes through the piston shaft through-hole 81 and then protrudes outward. The sleeve connection end 41 is tightly sleeved on the outer circumference of the protruding end of the shaft body 22. The outer circumference of the protruding end of the shaft body 22 and the wall of the sleeve connection end 41 form a cylindrical positioning pin installation cavity 90. The positioning pin 60 is inserted into the positioning pin installation cavity 90. The threaded end 51 of the fastening bolt 50 is threadedly connected to the axial threaded hole 221 of the protruding end of the shaft body 22, and the head 52 of the fastening bolt 50 presses against the exposed end face of the sleeve connection end 41. The linear spring 30 is sleeved on the shaft body 22 at the axial position within the cavity 71. The outer end of the linear spring 30 is placed in the positioning groove 82, and the inner end of the linear spring presses against the end face of the sealing ring end 21 away from the air cavity 72. The air cavity 72 is externally connected to external pressurized gas through a pipeline 73 (not shown in the figure, which is an existing mature technology). Pressurized gas is injected into the air cavity 72 to push the sealing ring end to move to the right, thereby driving the fork to move to the right. When the pressurized gas is depressurized, under the action of the linear spring, the sealing ring end moves to the left, thereby driving the fork to move to the left.

[0034] During specific implementation,

[0035] A sleeve stop 222 is further provided at the exposed end of the shaft body 22. The inner end face of the sleeve connection end 41 is closely arranged against the sleeve stop 222, and the sleeve connection end 41 is axially fastened to the piston shaft 20 by being pressed by the head 52 of the fastening bolt 50.

[0036] During specific implementation, a semi-circular hole is respectively formed on the outer circumference of the protruding end of the shaft body 22 and the wall of the sleeve connection end 41. The cylindrical pin is inserted into the cylindrical positioning pin installation cavity 90 formed by the combination of the two semi-circular holes to complete the locking connection;

[0037] A sealing ring 211 is also embedded in the thickness direction of the sealing ring end 21. The sealing ring 211 is arranged closely against the corresponding ring wall of the cavity 71 to ensure airtight operation.

[0038] The cylinder end cover 80 is fixedly installed on the exposed end face of the cavity of the cylinder housing 70 through circumferentially arranged cylinder bolts 100.

[0039] The working principle is as follows: Axially sleeve the sleeve connection end of the fork into the outer convex end of the shaft body, align the cylindrical pin holes on the outer ring surfaces of the sleeve connection end and the outer convex end of the shaft body to form an integral positioning pin installation cavity. The positioning pin is inserted into the positioning pin installation cavity to connect the fork and the piston shaft together. After the fork end is installed in place, threadedly insert the fastening bolt into the axial threaded hole of the outer convex end of the shaft body. The fastening bolt clamps the fork on the piston shaft to achieve anti-rotation locking of the cylinder fork. When there is only an axially operable space, it can reliably complete the anti-rotation locking of the fork and the piston shaft, avoiding the risk of loosening that cannot be locked, and at the same time avoiding the risk of the piston shaft rotating and driving the sealing ring to rotate, thereby causing early assembly wear of the sealing ring.

[0040] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0041] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A cylinder fork anti-rotation locking structure, characterized in that: It includes: A cylinder block, which includes a cylinder housing and a cylinder end cover; The piston shaft comprises a sealing ring end and a shaft body, wherein the shaft body is eccentrically arranged on the end surface of the sealing ring end and protrudes outwardly toward the cylinder end cover; Linear springs; A shift fork, comprising a sleeve connecting end and a shift fork end; Tighten the bolts; and positioning pins; The cylinder end cover fixing cover is installed on the exposed end surface of the cavity of the cylinder housing, and a piston shaft through hole is provided on the cylinder end cover, and the convex end of the shaft body penetrates the piston shaft through hole and convexes outward, and the sleeve connecting end is tightly sleeved on the outer circumference of the convex end of the shaft body, and the outer circumference of the convex end of the shaft body and the annular wall of the sleeve connecting end are combined to form at least one locating pin installation cavity, and the locating pin plug is installed in the locating pin installation cavity, and the threaded end of the fastening bolt is threadedly connected to the axial threaded hole of the convex end of the shaft, and the head of the fastening bolt is pressed against the exposed end surface of the sleeve connecting end, and the linear spring is sleeved on the axial position of the piston shaft located in the cavity, and one end of the linear spring is pressed against the end surface of the sealing ring end away from the air cavity, and the air cavity is connected to external pressure gas through a pipeline.

2. The cylinder fork anti-rotation locking structure according to claim 1, characterized in that: The exposed end of the shaft body is also provided with a sleeve stop, the inner end surface of the sleeve connecting end is tightly against the sleeve stop, and the axial fastening of the sleeve connecting end is completed by pressing with the head of the fastening bolt.

3. The cylinder fork anti-rotation locking structure according to claim 2, characterized in that: The number of the positioning pin is one, and the outer circumference of the outer convex end of the shaft body and the annular wall of the sleeve connecting end are combined to form a positioning pin installation cavity.

4. The cylinder fork anti-rotation locking structure according to claim 3, characterized in that: The positioning pin is a cylindrical pin, and the outer circumference of the outer convex end of the shaft body and the ring wall of the sleeve connecting end are each formed with a semicircular hole. The cylindrical pin is inserted into the circular hole formed by the combination of the two semicircular holes to complete the locking connection.

5. The cylinder fork anti-rotation locking structure according to claim 1, characterized in that: The cylinder end cover is fixed to the exposed end surface of the cavity of the cylinder housing through the cylinder bolts arranged in a ring.

6. The cylinder fork anti-rotation locking structure according to claim 1, characterized in that: A sealing ring is also embedded in the thickness direction of the sealing ring end, and the sealing ring is arranged closely against the corresponding ring wall of the cavity.

Images