Cam limiting structure of air compressor

Abstract

The utility model provides a cam limiting structure of an air compressor, and belongs to the technical field of air compressors. The problem that the assembly efficiency of parts such as a cam in an existing air compressor is low is solved. According to the cam limiting structure of the air compressor, the air compressor comprises a motor, a fan, a cam and a rolling bearing, the fan, the cam and the rolling bearing are sequentially arranged in a sleeving mode in the axial direction and fixed to the outer side of an output shaft of the motor, the end, facing the rolling bearing, of the cam is provided with an annular protruding boss, and the end of the boss abuts against the end of an inner ring of the rolling bearing. The other end of the cam is provided with an annular protruding block, the protruding block abuts against the fan, and one side of the protruding block is provided with a bulged block-shaped balance part. The cam limiting structure of the air compressor has the advantage of high assembly efficiency.

Description

TECHNICAL FIELD

[0001] The utility model belongs to air compressor technical field relates to a cam limiting structure of air compressor. BACKGROUND

[0002] The compressor is also known as air compressor, which is a device for converting mechanical energy into gas pressure and is widely used in chemical industry, machinery, medical treatment, textile, electric power, automobile and military industry. Among them, the piston air compressor is the most widely used air compressor. The air compressor mainly includes cam, connecting rod, piston, pressure plate and valve plate. The pressure plate is fixed on the end of the piston. The rotation of the cam drives the reciprocating motion of the connecting rod and the piston to compress the air between the pressure plate and the valve plate.

[0003] For example, a direct current air compressor has been designed and a Chinese patent has been applied for, with the application number 202320589915.5 and the publication number CN219911058U. The direct current air compressor includes a motor, which is a direct current motor. The end of the direct current motor is fixed to the inner side of the box. The box is internally provided with a bearing seat coaxial with the output shaft of the direct current motor. The motor output shaft is matched with the bearing seat through the bearing. The end of the motor output shaft is fixed with a cam or a crank after passing through the bearing. The cylinder is fixed on the top of the box. The cam or crank is connected with the piston in the cylinder through the connecting rod. The end of the cylinder is provided with a cylinder cover. The inlet and outlet valves are arranged on the cylinder cover. The accommodation cavity is formed between the port connected with the direct current motor on the inner side of the box and the bearing seat. The AC / DC conversion circuit board is fixed in the accommodation cavity. The center through hole is formed on the AC / DC conversion circuit board. The motor output shaft passes through the center through hole. The AC / DC conversion circuit board is electrically connected with the direct current motor. The heat dissipation fan is installed on the outer side of the cam or crank at both ends of the motor output shaft.

[0004] The components connected to the outer side of the motor output shaft in the above-mentioned direct current air compressor include bearing, cam and heat dissipation fan, and each component is independent of each other. In actual production and assembly, the fixed position of each component needs to be corrected manually, which reduces the assembly efficiency. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above-mentioned problems existing in the prior art and provides a cam limiting structure of air compressor, which solves the problem of low assembly efficiency of the cam and other components in the existing air compressor.

[0006] The purpose of the utility model can be realized by the following technical solutions:

[0007] The cam limiting structure of the air compressor comprises a motor, a fan, a cam and a rolling bearing which are sequentially arranged along the axial direction and fixed outside the output shaft of the motor, characterized in that one end of the cam towards the rolling bearing has a protruding annular boss, the end of the boss abuts against the end of the inner ring of the rolling bearing, the other end of the cam has an annular protrusion which abuts against the fan, and one side of the protrusion has a protruding block-shaped balancing part.

[0008] In the cam limiting structure of the air compressor, after the rolling bearing is fixed on the shell of the air compressor, the cam is pushed axially towards the rolling bearing until the boss of the cam abuts against the inner ring of the rolling bearing, thereby fixing the cam and the output shaft of the motor, and the fan is pushed axially again so that the fan abuts against the protrusion of the other end of the cam and is fixed. In the assembly process, after the rolling bearing is fixed, the boss and the protrusion are used to axially limit the cam and the fan, and the axial positions of the fan and the cam do not need to be separately corrected, thereby facilitating the assembly. The balancing part is arranged to make the protrusion play a limiting role and also play a dynamic balancing role.

[0009] In the cam limiting structure of the air compressor, the maximum radial width of the boss is not greater than the outer diameter of the inner ring of the rolling bearing. The small radial width of the boss makes it abut against only the inner ring of the rolling bearing and not contact other parts such as the outer ring of the rolling bearing, thereby playing a limiting role while avoiding affecting the circumferential rotation of the cam and ensuring the smooth rotation of the cam.

[0010] In the cam limiting structure of the air compressor, the side of the balancing part away from the inner hole of the protrusion has a circular arc-shaped balancing surface. The circular arc-shaped balancing surface on the outer side of the balancing part is more conducive to maintaining the dynamic balance of the entire structure during the circumferential rotation of the output shaft of the motor.

[0011] In the cam limiting structure of the air compressor, the protrusion has a mounting hole for a fastener to pass through, which is radially and through the other side of the balancing part. The fastener passes through the mounting hole to fix the entire cam on the output shaft of the motor. The mounting hole is arranged on the protrusion, which facilitates the connection of the outer side of the cam with components such as connecting rods and pistons, and the mounting hole and the balancing part are located at substantially the same axial position on the output shaft of the motor, which can better cooperate with the balancing part to achieve dynamic balance.

[0012] Compared with the prior art, in the cam limiting structure of the air compressor, after the rolling bearing is fixed, the boss and the protrusion are used to axially limit the cam and the fan, and the axial positions of the fan and the cam do not need to be separately corrected, thereby facilitating the assembly. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is the sectional view structure schematic diagram of the cam limiting structure of the air compressor after being installed in the air compressor.

[0014] Figure 2 is the structure schematic diagram of the cam in the cam limiting structure of the air compressor.

[0015] In the figure, 1, motor; 11, output shaft; 2, fan; 3, cam; 31, boss; 32, lug; 33, balancing part; 34, balancing surface; 35, mounting hole; 4, rolling bearing. DETAILED DESCRIPTION

[0016] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0017] As shown in the figure, Figure 1 The air compressor comprises a motor 1 and a fan 2, a cam 3 and a rolling bearing 4 which are sequentially sleeved and fixed on the outer side of the output shaft 11 of the motor 1 in the axial direction. Here, the rolling bearing 4 is of the existing structure and comprises an inner ring, an outer ring and other components.

[0018] As shown in the figure, Figure 2 The one end of the cam 3 towards the rolling bearing 4 has a boss 31 which is annularly protruded, and the end of the boss 31 abuts against the end of the inner ring of the rolling bearing 4. Here, the maximum radial width of the boss 31 is not greater than the outer diameter of the inner ring of the rolling bearing 4.

[0019] The other end of the cam 3 has a lug 32 which is annularly shaped and abuts against the fan 2. The lug 32 has a balancing part 33 which is protruded and block-shaped on one side. In this embodiment, the cross-sectional shape of the balancing part 33 is a part of a sector, and the side of the balancing part 33 away from the inner hole of the lug 32 has a balancing surface 34 which is circularly arc-shaped. The mounting hole 35 for the fastener to pass through is radially and throughly formed on the other side of the lug 32 relative to the balancing part 33. The lug 32 and the boss 31 are both parts of the cam 3 and are of an integral structure. The entire cam 3 only has one inner hole for the output shaft 11 of the motor 1 to pass through.

[0020] In assembly, after the rolling bearing 4 is fixed on the bearing seat of the air compressor shell, the cam 3 can be pushed in the axial direction towards the rolling bearing 4 until the boss 31 of the cam 3 abuts against the inner ring of the rolling bearing 4. Then the cam 3 and the output shaft 11 of the motor 1 can be fixed by the fastener such as screw which is threadedly connected at the mounting hole 35. After that, the fan 2 is axially pushed in, so that the fan 2 abuts against the lug 32 at the other end of the cam 3 and is also fixed by the fastener.

[0021] In the assembling process, after the rolling bearing 4 is fixed, the cam 3 and the fan 2 are axially limited by the boss 31 and the lug 32, and the axial positions of the fan 2 and the cam 3 do not need to be separately corrected, so that the assembling is convenient.

[0022] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A cam limiting structure of an air compressor, the air compressor comprising a motor (1) and a fan (2), a cam (3) and a rolling bearing (4) which are sequentially sleeved and fixed outside an output shaft (11) of the motor (1) in an axial direction, characterized in that, The cam (3) has a boss (31) protruding annularly at one end thereof abutting against an end of an inner ring of the rolling bearing (4), and has a lug (32) annularly at the other end thereof abutting against the fan (2), one side of the lug (32) having a balance portion (33) protruding blockily.

2. The cam stop structure of the air compressor according to claim 1, wherein The maximum radial width of the boss (31) is not greater than the outer diameter of the inner ring of the rolling bearing (4).

3. The cam stop structure of the air compressor according to claim 1 or 2, characterized by, The balance portion (33) has a balance surface (34) in the form of a circular arc at a side thereof away from the inner hole of the lug (32).

4. The cam stop structure of the air compressor according to claim 1 or 2, characterized by, The lug (32) has a mounting hole (35) for a fastener therethrough radially formed at the other side thereof relative to the balance portion (33).

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