Integral roller pin guide assembly

Abstract

The invention discloses an integral roller pin guide assembly which comprises a roller pin guide assembly body, a guide rail and an actuator cylinder. Wherein the guide rail is of a cuboid structure with a square through hole; the roller pin guide assembly is of a coaxial structure and is provided with a threaded section at the bottom; the upper end face of the actuator cylinder is provided with a threaded groove. The roller pin guide assembly is in tangent contact with the square through hole end face of the guide rail, and the square through hole end face of the guide rail plays a role in positioning the roller pin guide assembly; a threaded section at the bottom of the roller pin guide assembly is screwed into a threaded groove in the upper end face of the actuating cylinder; during movement, the roller pin guide assembly linearly moves along the end face of the square through hole of the guide rail and drives the actuating cylinder to linearly stretch out and draw back through screw-thread fit. According to the integrated design scheme of the needle bearing and the guide rod, the structural size can be obviously reduced under the condition that the installation space is limited; the bearing capacity of the guide mechanism can be improved by increasing the working diameter of the guide rod; and the number of parts in the final assembly link is reduced, the final assembly efficiency is improved, and the maintainability is improved.

Description

Technical Field

[0001] The invention relates to an integral needle roller guide assembly and belongs to the field of aerospace servo equipment. Background Art

[0002] The electromechanical actuator is driven by a screw pair. To ensure that the output is in the form of linear motion, a guide component needs to be designed. The guide solutions retrieved mainly include guide strips and guide rods. The guide rod solutions include guide block type and bearing type.

[0003] The guide mechanism disclosed in "An external integrated displacement sensor installation mechanism suitable for electromechanical actuators" mainly includes deep groove ball bearings, guide rods, guide rails and actuator cylinders. The guide rods are installed on the outer wall of the actuator cylinder, the deep groove ball bearings are installed with the guide rods, and the outer ring of the bearings rolls along the guide rail grooves to achieve linear telescopic motion of the actuator cylinder. This scheme has a simple structure, and its structural bearing capacity depends on the shaft diameter of the guide rod assembled with the bearing. However, due to the limited assembly space, the shaft diameter of the guide rod is usually small, which limits the bearing capacity of the guide mechanism and is not suitable for large-load application scenarios.

[0004] "High-load needle roller bearing and needle roller assembly and retainer thereof" discloses a high-load needle roller bearing with a single annular rib design, which has the advantages of ensuring stable operation of the needle roller and conveniently increasing the length of the needle roller, thereby effectively improving the load capacity. The needle roller bearing mentioned in the patent is large in size and is not suitable for solving high-load problems in space-constrained environments. Summary of the invention

[0005] The technical problem solved by the present invention is: to overcome the deficiency of the prior art in lacking a large load-bearing guide structure, and to propose an integral needle roller guide assembly, in which the needle roller bearing and the guide rod are designed and manufactured as one, with a stronger load-bearing capacity, higher reliability and easier assembly operation.

[0006] The technical solution of the present invention is: an integral needle roller guide assembly, comprising a needle roller guide assembly, a guide rail and an actuator; wherein the guide rail is a rectangular structure with a square through hole; the needle roller guide assembly is a coaxial structure with a threaded section at the bottom; the actuator serves as a guide target and has a threaded groove on the upper end face; the needle roller guide assembly is in tangential contact with the end face of the square through hole of the guide rail, and the square through hole end face of the guide rail plays a positioning role for the needle roller guide assembly; the threaded section at the bottom of the needle roller guide assembly is screwed into the threaded groove on the upper end face of the actuator cylinder; when moving, the needle roller guide assembly moves linearly along the end face of the square through hole of the guide rail, and drives the actuator cylinder to move linearly and telescopically through the threaded cooperation.

[0007] The needle roller guide assembly is designed to be coaxial and integral with a bearing outer ring, a guide rod, a needle roller and a shaft end retaining ring.

[0008] The guide rod is a coaxial cylindrical structure with different diameters, and is divided into a sleeve bearing section and a threaded section according to its function, wherein the threaded section is located at the bottom.

[0009] The sleeve bearing section and the threaded section have the same diameter.

[0010] The bearing outer ring and the needle roller play the role of a needle roller bearing, and a positioning groove is provided on the bearing outer ring.

[0011] The outer diameter of the guide rod sleeve bearing section is the inner diameter of the needle roller bearing.

[0012] The shaft end retaining ring is a circular ring structure made of rubber material and plays a positioning role.

[0013] During assembly, the needle rollers are evenly arranged on the outer circle of the guide rod sleeve bearing section, and the outer ring of the bearing is sleeved on the outside of the needle rollers; the shaft end retaining ring is installed in the positioning groove of the outer ring of the bearing, and the upper end surface contacts the needle rollers. The shaft end retaining ring plays the role of positioning the outer ring of the bearing.

[0014] During movement, the outer side of the bearing outer ring rolls along the inner surface of the square through hole of the guide rail, driving the linear motion of the needle roller guide assembly. During this process, the needle roller rolls relatively on the outer circle of the guide rod sleeve bearing section; the threaded section at the bottom of the guide rod is screwed into the threaded groove on the upper end face of the actuator cylinder, and the needle roller guide assembly drives the actuator cylinder to move through the threaded fit.

[0015] The advantages of the present invention compared with the prior art are:

[0016] (1) The present invention adopts an integrated design of a needle bearing and a guide rod, which can significantly reduce the structural volume under conditions of limited installation space, thereby saving structural space.

[0017] (2) The present invention adopts an integrated design of a needle bearing and a guide rod, and by increasing the diameter of the bearing section of the guide rod sleeve, the bearing capacity of the guide mechanism is improved, which has the advantage of a large bearing capacity.

[0018] (3) The present invention integrates the parts that play a positioning role, such as the bearing outer ring, into the integral needle roller guide assembly, thereby reducing the number of parts in the final assembly process, thereby improving the final assembly efficiency and enhancing maintainability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the guide assembly of the present invention.

[0020] Figure 2 It is a schematic structural diagram of the integral needle roller guide assembly of the present invention.

[0021] Figure 3 Schematic diagram of the bearing end diameter of the guide rod sleeve. DETAILED DESCRIPTION

[0022] like Figure 1 As shown, an integral needle roller guide assembly proposed by the present invention is applied to the guide scheme, and is composed of a needle roller guide assembly 1, a guide rail 2 and an actuator 3. Among them, the guide rail 2 is a rectangular parallelepiped structure with a square through hole; the needle roller guide assembly 1 is a coaxial structure with a threaded section at the bottom; the actuator 3 is the target of the guide, and has a threaded groove on the upper end face. The needle roller guide assembly 1 is in tangential contact with the end face of the square through hole of the guide rail 2, and the square through hole end face of the guide rail 2 plays a positioning role for the needle roller guide assembly 1; the threaded section at the bottom of the needle roller guide assembly 1 is screwed into the threaded groove on the upper end face of the actuator 3. During movement, the needle roller guide assembly 1 moves linearly along the end face of the square through hole of the guide rail 2, and drives the actuator 3 to move linearly and telescopically through the threaded fit.

[0023] like Figure 2 As shown, the needle roller guide assembly 1 is designed as a coaxial and co-existing integrated housing by a bearing outer ring 1-1, a guide rod 1-2, a needle roller 1-3 and a shaft end retaining ring 1-4. The guide rod 1-2 is a coaxial cylindrical structure with different diameters. According to the function, it can be divided into a sleeve bearing section and a threaded section, and the threaded section is located at the bottom. The bearing outer ring 1-1 and the needle roller 1-3 play the role of a needle roller bearing, and the bearing outer ring 1-1 has a positioning slot; in the present invention, the outer circle of the guide rod 1-2 sleeve bearing section is the inner diameter of the needle roller bearing. The shaft end retaining ring 1-4 is a ring structure made of rubber material, which plays a positioning role. During assembly, the needle rollers 1-3 are evenly arranged on the outer circle of the guide rod 1-2 sleeve bearing section, and the bearing outer ring 1-1 is sleeved on the outside of the needle roller 1-3. The shaft end retaining ring 1-4 is installed at the positioning slot of the bearing outer ring 1-1, and the upper end surface contacts the needle roller 1-3. The shaft end retaining ring 1-4 plays the role of positioning the bearing outer ring 1-1. In the guide scheme, during movement, the outer side of the bearing outer ring 1-1 rolls along the inner surface of the square through hole of the guide rail 2, driving the linear movement of the needle roller guide assembly 1. During this process, the needle roller 1-3 rolls relatively on the outer circle of the bearing section of the guide rod 1-2. The threaded section at the bottom of the guide rod 1-2 is screwed into the thread groove on the upper end face of the actuator 3, and the needle roller guide assembly 1 drives the actuator 3 to move through the threaded fit.

[0024] In the existing use requirements, it is often hoped that the load-bearing capacity is as strong as possible while the structure volume is as small as possible. The present invention significantly reduces the volume of the structure by integrating the needle bearing and the guide rod, that is, the outer circle of the bearing section of the guide rod 1-2 is used as the inner diameter of the needle bearing. Figure 3 As shown, by increasing the diameter of the bearing section of the guide rod 1-2 to be the same as the diameter of the bottom threaded section of the guide rod 1-2, the bearing capacity of the structure is significantly increased.

[0025] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solution of the present invention by using the technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. An integrated needle roller guide assembly, characterized in that: The invention comprises a needle roller guide assembly (1), a guide rail (2) and an actuator (3); wherein the guide rail (2) is a rectangular parallelepiped structure with a square through hole; the needle roller guide assembly (1) is a coaxial structure with a threaded section at the bottom; the actuator (3) serves as a guide target and has a threaded groove on the upper end face; the needle roller guide assembly (1) is in tangential contact with the end face of the square through hole of the guide rail (2), and the square through hole end face of the guide rail (2) plays a positioning role for the needle roller guide assembly (1); the threaded section at the bottom of the needle roller guide assembly (1) is screwed into the threaded groove on the upper end face of the actuator (3); when moving, the needle roller guide assembly (1) moves linearly along the end face of the square through hole of the guide rail (2), and drives the actuator (3) to move linearly through the threaded fit.

2. The integrated needle roller guide assembly according to claim 1, characterized in that: The needle roller guide assembly (1) is designed as an integral unit with a bearing outer ring (1-1), a guide rod (1-2), a needle roller (1-3) and a shaft end retaining ring (1-4) which are coaxial and share a common housing.

3. The integrated needle roller guide assembly according to claim 2, characterized in that: The guide rod (1-2) is a coaxial cylindrical structure with different diameters, and is divided into a sleeve bearing section and a threaded section according to function, wherein the threaded section is located at the bottom.

4. The integrated needle roller guide assembly according to claim 3, characterized in that: The sleeve bearing section and the threaded section have the same diameter.

5. The integrated needle roller guide assembly according to claim 3, characterized in that: The bearing outer ring (1-1) and the needle roller (1-3) function as a needle roller bearing, and a positioning groove is provided on the bearing outer ring (1-1).

6. The integrated needle roller guide assembly according to claim 5, characterized in that: The outer diameter of the guide rod (1-2) sleeve bearing section is the inner diameter of the needle roller bearing.

7. The integrated needle roller guide assembly according to claim 5, characterized in that: The shaft end retaining ring (1-4) is a circular ring structure made of rubber material and plays a positioning role.

8. The integrated needle roller guide assembly according to claim 5, characterized in that: During assembly, the needle rollers (1-3) are evenly arranged on the outer circle of the guide rod (1-2) sleeve bearing section, and the bearing outer ring (1-1) is sleeved on the outside of the needle rollers (1-3); the shaft end retaining ring (1-4) is installed at the positioning groove of the bearing outer ring (1-1), and the upper end surface contacts the needle rollers (1-3), and the shaft end retaining ring (1-4) plays a role in positioning the bearing outer ring (1-1).

9. The integrated needle roller guide assembly according to claim 5, characterized in that: During movement, the outer side of the bearing outer ring (1-1) rolls along the inner side surface of the square through hole of the guide rail (2), driving the needle roller guide assembly (1) to move linearly. During this process, the needle roller (1-3) rolls relatively on the outer circle of the bearing sleeve section of the guide rod (1-2); the threaded section at the bottom of the guide rod (1-2) is screwed into the threaded groove on the upper end surface of the actuator cylinder (3), and the needle roller guide assembly (1) drives the actuator cylinder (3) to move through the threaded fit.

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