CN221347557U - Screw assembly - Google Patents

Abstract

The utility model provides a screw assembly, and belongs to the technical field of machinery. It has solved the problem that current screw influences the transmission precision. The screw assembly comprises a screw body, wherein a taper hole is axially formed in the end face of the rod part of the screw body, and the diameter of the taper hole gradually decreases towards the head part of the screw body; a conical cylinder matched with the conical hole is arranged in the conical hole, and the outer side surface of the conical cylinder is tightly attached to the inner side surface of the conical hole; the end face of the conical cylinder far away from the head of the screw body is integrally provided with a convex column, the central axes of the convex column and the conical cylinder are collinear, the outer end of the convex column extends out of the conical hole, and the cross section of the convex column is polygonal. The screw assembly can improve transmission precision.

Description

Screw assembly

Technical Field

The utility model belongs to the technical field of machinery, and relates to a screw, in particular to a screw assembly.

Background

Screws are a relatively conventional fastener commonly used to connect two or more components to transmit torque and power.

The existing screw is a transmission shaft bolt (application number: 201020266921. X) disclosed in China patent library, and comprises a bolt head, a screw rod consisting of a polish rod and a threaded rod, and a trimming edge is arranged on the circumference of the bolt head.

When the bolt is used, the transmission shaft is provided with a threaded hole matched with the threaded rod so as to connect the transmission shaft with the transmission part. However, the threaded fit between the threaded rod and the threaded hole is clearance, so that certain dislocation exists between the central axes of the transmission shaft and the transmission part, and the transmission precision and stability are affected.

Disclosure of utility model

The utility model aims to solve the problems in the prior art and provides a screw assembly capable of improving transmission precision.

The aim of the utility model can be achieved by the following technical scheme: the screw assembly comprises a screw body and is characterized in that a taper hole is axially formed in the end face of the rod part of the screw body, and the diameter of the taper hole gradually decreases towards the head part of the screw body; a conical cylinder matched with the conical hole is arranged in the conical hole, and the outer side surface of the conical cylinder is tightly attached to the inner side surface of the conical hole; the end face of the conical cylinder far away from the head of the screw body is integrally provided with a convex column, the central axes of the convex column and the conical cylinder are collinear, the outer end of the convex column extends out of the conical hole, and the cross section of the convex column is polygonal.

In actual products, the bottom wall of the threaded hole matched with the screw body on the transmission shaft is provided with a polygonal hole matched with the convex column.

When in use, the convex column is inserted into the polygonal hole, so that the transmission shaft and the conical column form circumferential fit; and then screwing in the screw body to enable the conical cylinder to extend into the conical hole and gradually compress the conical hole, so that connection is completed.

The conical cylinder circumferentially connected with the transmission shaft is matched with the screw body through the conical surface, so that the coaxiality of the screw body and the transmission shaft can be effectively enhanced, and the transmission stability and the transmission precision are improved; simultaneously, under the cooperation of toper cylinder, make screw body inboard and outside all form circumference with the transmission shaft and be connected to further improve transmission stability and precision.

In the screw assembly, the taper hole is a blind hole, a rubber block is further arranged in the taper hole, and two end faces of the rubber block are respectively abutted against the bottom wall of the taper hole and the end face of the taper cylinder. The rubber block is used for pressing in the conical cylinder to limit, so that the conical cylinder is prevented from being excessively pressed in, vibration transmitted by the transmission shaft can be buffered, and the transmission stability and the transmission precision are further enhanced.

In the screw assembly, the outer side surface of the rubber block is a conical surface matched with the conical hole, and the conical surface is pressed on the inner side surface of the conical hole. By adopting the design, the rubber block is convenient to position and install.

In the screw assembly, the end face of the conical cylinder, which is in contact with the rubber block, is axially provided with a straight hole. The straight hole is designed, so that the whole weight of the conical cylinder can be reduced, and the conical cylinder can be in closer contact with the wall of the conical hole.

In the screw assembly, the arc transition is adopted between the inner end side wall of the convex column and the end face of the conical column body, so that the stability and the strength of connection between the convex column and the conical column body are effectively enhanced, and the screw assembly is ensured to work stably.

In the screw assembly, the conical cylinder and the convex column are integrally formed in a casting mode.

In the screw assembly, the outer side face of the rubber block is provided with the crushing groove which is annular, and the crushing groove and the rubber block are coaxially arranged, so that the rubber block is easier to crush and deform, and thus, the rubber block is easier to be placed into the taper hole, and the vibration can be buffered faster.

In the screw assembly, the axial cross section of the crushing groove is circular arc.

Compared with the prior art, the screw assembly has the following advantages:

1. the conical cylinder circumferentially connected with the transmission shaft is matched with the screw body through the conical surface, so that the coaxiality of the screw body and the transmission shaft can be effectively enhanced, and the transmission stability and the transmission precision are improved; simultaneously, under the cooperation of toper cylinder, make screw body inboard and outside all form circumference with the transmission shaft and be connected to further improve transmission stability and precision.

2. The rubber block is used for pressing in the conical cylinder to limit, so that the conical cylinder is prevented from being excessively pressed in, vibration transmitted by the transmission shaft can be buffered, and the transmission stability and the transmission precision are further enhanced.

Drawings

Fig. 1 is a schematic perspective view of a screw assembly.

FIG. 2 is a schematic cross-sectional view of a screw assembly.

Fig. 3 is an enlarged schematic view at a in fig. 2.

Fig. 4 is a schematic view of the structure of the tapered cylinder.

In the figure, 1, a screw body; 1a, taper holes; 2. a tapered cylinder; 2a, convex columns; 2b, straight holes; 3. a rubber block; 3a, crushing groove.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

As shown in fig. 1, the screw assembly comprises a screw body 1, wherein the screw body 1 is of an integrated structure and consists of a rod part and a head part.

Wherein,

As shown in fig. 1, 2 and 4, a taper hole 1a is axially formed in the end face of the shaft portion of the screw body 1, and the taper hole 1a and the screw body 1 are coaxial. The taper hole 1a is a blind hole, and the diameter of the taper hole 1a gradually decreases from the shaft portion of the bolt body to the head portion of the screw body 1. A conical cylinder 2 matched with the conical hole 1a is arranged in the conical hole 1a, and the outer side surface of the conical cylinder 2 is tightly attached to the inner side surface of the conical hole 1 a. The end face of the conical cylinder 2 far away from the head of the screw body 1 is integrally formed with a convex column 2a, and the central axes of the convex column 2a and the conical cylinder 2 are collinear. The arc transition is adopted between the inner end side wall of the convex column 2a and the end surface of the conical column 2, so that the stability and the strength of connection between the convex column 2a and the conical column 2 are effectively enhanced, and the stable operation of the screw assembly is ensured; the outer end of the convex column 2a extends out of the taper hole 1a, and the cross section of the convex column 2a is polygonal.

In actual products, the bottom wall of the threaded hole matched with the screw body 1 on the transmission shaft is provided with a polygonal hole matched with the convex column 2 a.

When in use, the convex column 2a is inserted into the polygonal hole, so that the transmission shaft and the conical column 2 form circumferential fit; then screw in the screw body 1 makes the toper cylinder 2 stretch into taper hole 1a and compress tightly gradually, accomplish the connection.

The conical cylinder 2 and the screw body 1 which are circumferentially connected with the transmission shaft are matched through conical surfaces, so that the coaxiality of the screw body 1 and the transmission shaft can be effectively enhanced, and the transmission stability and the transmission precision are improved; simultaneously, under the cooperation of toper cylinder 2, make screw body 1 inboard and outside all form circumferential connection with the transmission shaft to further improve transmission stability and precision.

Further, a rubber block 3 is further disposed in the taper hole 1a, and two end faces of the rubber block 3 are respectively pressed against the bottom wall of the taper hole 1a and the end face of the taper cylinder 2. The rubber block 3 is used for pressing in the conical cylinder 2 to limit, so that the conical cylinder 2 is prevented from being excessively pressed in, vibration transmitted by a transmission shaft can be buffered, and the transmission stability and the transmission precision are further enhanced.

The positioning mode of the rubber block 3 is as follows: as shown in fig. 2 and 3, the outer side surface of the rubber block 3 is a conical surface matched with the conical hole 1a, and the conical surface is pressed on the inner side surface of the conical hole 1 a. Further, the outer side surface of the rubber block 3 is provided with the crushing groove 3a, the crushing groove 3a is annular, and the crushing groove 3a and the rubber block 3 are coaxially arranged, so that the rubber block 3 is easier to crush and deform, and therefore, the rubber block 3 is easier to be placed into the taper hole 1a, and the vibration can be buffered faster. The axial cross section of the crush groove 3a is preferably circular arc-shaped.

As shown in fig. 2, a straight hole 2b is axially formed in the end face of the tapered cylinder 2 in contact with the rubber block 3. The straight hole 2b is designed, so that the whole weight of the conical cylinder 2 can be reduced, and the conical cylinder 2 can be in closer contact with the wall of the conical hole 1 a.

In the actual product, the conical cylinder 2 and the convex column 2a are integrally formed in a casting mode, so that the connection stability and strength of the conical cylinder 2 and the convex column 2a are further enhanced.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Claims (8)

1. The screw assembly comprises a screw body (1) and is characterized in that a taper hole (1 a) is axially formed in the end face of the rod part of the screw body (1), and the diameter of the taper hole (1 a) gradually becomes smaller towards the head part of the screw body (1); a conical column body (2) matched with the conical hole (1 a) is arranged in the conical hole (1 a), and the outer side surface of the conical column body (2) is tightly attached to the inner side surface of the conical hole (1 a); the end face, far away from the head part of the screw body (1), of the conical column body (2) is integrally provided with a convex column (2 a), the central axes of the convex column (2 a) and the conical column body (2) are collinear, the outer end of the convex column (2 a) extends out of the conical hole (1 a), and the cross section of the convex column (2 a) is polygonal.

2. Screw assembly according to claim 1, characterized in that the taper hole (1 a) is of blind hole type, the taper hole (1 a) is internally provided with a rubber block (3), and two end faces of the rubber block (3) are respectively pressed against the bottom wall of the taper hole (1 a) and the end face of the taper cylinder (2).

3. Screw assembly according to claim 2, characterized in that the outer side of the rubber block (3) is a conical surface matching the conical hole (1 a) and the conical surface presses against the inner side of the conical hole (1 a).

4. Screw assembly according to claim 1, characterized in that the end face of the conical cylinder (2) in contact with the rubber block (3) is axially provided with a straight hole (2 b).

5. Screw assembly according to claim 1, characterized in that the inner end side wall of the boss (2 a) and the end face of the conical cylinder (2) are in arc transition.

6. Screw assembly according to claim 1, characterized in that the conical cylinder (2) and the boss (2 a) are integrally formed by casting.

7. A screw assembly according to claim 3, characterized in that the outer side of the rubber block (3) is provided with a crushing groove (3 a), the crushing groove (3 a) is annular, and the crushing groove (3 a) and the rubber block (3) are coaxially arranged.

8. Screw assembly according to claim 7, characterized in that the axial cross-section of the crushing groove (3 a) is circular arc.