CN116146300A - Steel ball positioning type camshaft assembly structure and cam installation and positioning method - Google Patents

Abstract

The invention discloses a steel ball positioning type camshaft assembly structure and a cam installation and positioning method, which are characterized in that: a camshaft, a cam and a steel ball are included; the axial center of the camshaft is provided with a positioning hole; the camshaft There are several cam installation positions on the top, and the cams are respectively installed on the cam installation positions; the steel balls are respectively installed in the positioning holes of the camshafts. The combination of the cam and the camshaft of the present invention is stable, and the material selection, processing and production of the camshaft and the cam are realized separately, and the production cost of the enterprise can be reduced while having a stable structure.

Description

Steel ball positioning camshaft assembly structure and cam installation and positioning method

technical field

The invention relates to the field of engines, in particular to a steel ball positioning type camshaft assembly structure and a cam installation and positioning method.

Background technique

Camshafts and cams are very important components in a piston engine. Its function is to control the opening and closing of the valve. When the engine is running, the camshaft rotates at a very high speed and needs to bear a large torque, so the requirements for the strength and support of the camshaft are very high. While the camshaft is rotating at a high speed, the cam is also in contact with the cam tappet at high speed. , so the material of the cam also requires a crossbar, which has strength and wear resistance compared to the camshaft. Existing camshafts and cams are one-piece or interference-fit combined, and the same is true for camshafts and cam materials for one-piece camshaft assemblies. The cam has higher requirements on materials, and the material cost is relatively expensive. The material must be based on the cam, which also leads to a high cost of producing a camshaft; the interference fit combined camshaft assembly, such as the published application number of "one-cylinder multi-cam combined camshaft": 201420263167.2 , the camshaft and the cam are assembled by interference fit. After the engine of this fixed structure has been running for a long time and at high speed, the cam will deviate, which will cause the engine to run abnormally.

The disclosure of the above background technical content is only used to assist in understanding the inventive concepts and technical solutions of the present invention, and it does not necessarily belong to the prior art of this patent application. There is no clear evidence that the above content has been disclosed on the filing date of this patent application. Under the circumstances, the above background technology should not be used to evaluate the novelty and inventiveness of this application.

Contents of the invention

The purpose of the present invention is to provide a steel ball positioning type camshaft assembly structure and cam installation and positioning method to solve the problem that the cam and camshaft material of the existing camshaft assembly cannot be selected separately, the cost is high, and the engine runs for a long time and runs at high speed The middle cam will be offset, which will cause abnormal engine operation.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

A steel ball positioning type camshaft assembly structure is characterized in that: it includes a camshaft, a cam and a steel ball; the axial center of the camshaft is provided with a positioning hole; the camshaft is provided with several cam installation positions, The cams are respectively installed on the cam installation positions; the steel balls are respectively installed in the positioning holes of the camshafts.

Further, a steel ball is installed in the positioning hole corresponding to each cam.

Further, the steel ball is in interference fit with the positioning hole of the camshaft.

Further, the cam is in interference fit with the camshaft.

Further, multiple cams can be installed in all one cam installation position.

A cam installation and positioning method of a steel ball positioning type camshaft assembly structure is characterized in that it comprises the following steps:

S1: Cam installation, first freeze the camshaft to between -150°C and -200°C, then insert the cams into the camshaft in turn, then adjust the position and direction of each cam, and finally put the camshaft and the cam as a whole at room temperature The temperature of the camshaft is raised to normal temperature in water, and the cam installation is completed.

S2: Steel ball positioning, first freeze the steel balls to between -150°C and -200°C, then push the steel balls into the positioning holes in the center of the camshaft in turn, install a steel ball in the positioning hole corresponding to each cam, After completing the installation of all steel balls, place them in room temperature to rise to room temperature naturally, that is to complete the installation and positioning of the cam.

Compared with prior art, advantage and beneficial effect of the present invention are:

The camshaft assembly of the present invention includes a camshaft, a cam, and a steel ball. The camshaft is provided with a positioning hole, and the camshaft is provided with a cam installation position. Through interference fit, multiple cams can be installed according to requirements, so that the cam can be installed stably. At the same time, the cam Steel balls are also installed in the positioning hole of the shaft, and the positions of the steel balls are respectively corresponding to each cam and used to support the camshaft to prevent its deformation from causing the position of the cam to move. The combination of the cam and the camshaft of the present invention is stable, so that the camshaft and the cam can be separated for material selection, processing and production, and the production cost of the enterprise can be reduced while having a stable structure.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of camshaft of the present invention;

Fig. 3 is a structural schematic diagram of the cam of the present invention.

Detailed ways

The present invention will be further described in detail below in combination with specific embodiments. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

As shown in Figures 1 to 3, a steel ball positioning camshaft assembly structure is characterized in that it includes a camshaft 1, a cam 2 and a steel ball 3; the axial center of the camshaft 1 is provided with a positioning hole 4, It is used to install the steel ball 3; the camshaft 1 is provided with several cam installation positions 5, and the cams 2 are respectively installed on the cam installation positions 5, and all one cam installation position 5 can be installed with multiple cams 2, cam 2 The number of installations is determined by the model of the engine. The cam 2 and the camshaft 1 are an interference fit, and the cam 2 can be fixed on the camshaft 1. The cam 2 and the camshaft 1 are designed separately, and the cam 2 and the camshaft 1 The materials can be selected separately to save material cost; the steel balls 3 are respectively installed in the positioning holes 4 of the camshaft 1, and a steel ball 3 is installed in the positioning holes 4 corresponding to each cam 2 , the steel ball 3 is an interference fit with the positioning hole 4 of the camshaft 1, by installing a steel ball in the positioning hole 4 corresponding to each cam 2, the camshaft 1 can be supported to prevent its deformation from causing the cam 2 to loosen , the position is offset.

A cam installation and positioning method of a steel ball positioning type camshaft assembly structure, comprising the following steps:

S1: Cam installation, first freeze the camshaft 1 to between -150°C and -200°C, then insert the cam 2 into the camshaft 1 in turn, then adjust the position and direction of each cam 2, and finally camshaft 1 and The cam 2 is put into normal temperature water as a whole to raise the temperature of the camshaft 1 to a normal temperature state, that is, the installation of the cam 2 is completed.

S2: Steel ball positioning, first freeze the steel ball 3 to between -150°C and -200°C, then push the steel ball 3 into the positioning hole 4 in the center of the camshaft 1 in turn, and each cam 2 corresponds to the positioning hole 4 A steel ball 3 is installed inside, and after all the steel balls 3 are installed, they are placed in normal temperature and naturally rise to normal temperature, that is, the installation and positioning of the cam 2 are completed.

The above content is a further detailed description of the present invention in conjunction with specific/preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, they can also make some substitutions or modifications to the described embodiments, and these substitutions or modifications should be regarded as Belong to the protection scope of the present invention.

Claims (6)

1. A steel ball positioning type cam shaft assembly structure is characterized in that: comprises a cam shaft, a cam and a steel ball; the axial center of the cam shaft is provided with a positioning hole; the cam shaft is provided with a plurality of cam mounting positions, and the cams are respectively mounted on the cam mounting positions; the steel balls are respectively arranged in the positioning holes of the cam shaft.

2. The steel ball positioning type cam shaft assembly structure according to claim 1, wherein: and a steel ball is arranged in the corresponding positioning hole of each cam.

3. The steel ball positioning type cam shaft assembly structure according to claim 1, wherein: the steel ball is in interference fit with the positioning hole of the cam shaft.

4. The steel ball positioning type cam shaft assembly structure according to claim 1, wherein: the cam is in interference fit with the cam shaft.

5. The steel ball positioning type cam shaft assembly structure according to claim 1, wherein: all of the cam mounting locations may mount a plurality of cams.

6. A cam mounting and positioning method of a steel ball positioning type cam shaft assembly structure according to any one of claims 1 to 5, comprising the steps of:

s1: and (3) installing the cams, namely firstly freezing the cam shaft to a temperature between 150 ℃ below zero and 200 ℃ below zero, then sleeving the cams into the cam shaft in sequence, adjusting the position and the direction of each cam, and finally, integrally placing the cam shaft and the cams into normal-temperature water to raise the temperature of the cam shaft to a normal-temperature state, thereby completing the installation of the cams.

S2: the steel balls are positioned, firstly, the steel balls are frozen to be between 150 ℃ below zero and 200 ℃ below zero, then, the steel balls are sequentially pushed into positioning holes in the center of the cam shaft, one steel ball is arranged in each positioning hole corresponding to each cam, after all the steel balls are arranged, the steel balls are naturally heated to normal temperature, and then, the installation and the positioning of the cams are completed.

Images