Detection piece for quickly finding out quantitative offset reference surface of camshaft

Abstract

The utility model discloses a detection piece for rapidly finding out a quantitative offset reference surface of a camshaft, which comprises a special-shaped pin, the special-shaped pin is a cylindrical pin, the cross section of the special-shaped pin is integrally bilaterally symmetrical, and the special-shaped pin is enclosed by a small-diameter major arc section and a large-diameter minor arc section which are concentrically arranged, and two tangent planes respectively connected to the small-diameter major arc section and the large-diameter minor arc section; the diameter of the small-diameter major arc section is smaller than the width of a cam shaft end notch, the diameter of the large-diameter minor arc section is larger than the width of the cam shaft end notch, and the radius of the small-diameter major arc section is just the quantitative deviation value of the cam shaft datum plane. The special-shaped pin can be clamped and fixed in the camshaft notch, the structure is simple, and operation is easy; by detecting the center of the small-diameter major arc section, the quantitative offset reference surface of the camshaft can be quickly and accurately found out; through the columnar special-shaped pin formed by the circular arcs, machining is convenient, the manufacturing cost is low, and the machining cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of camshaft measurement, in particular to a detection component for quickly finding a quantitative deviation reference surface of a camshaft. Background Art

[0002] The camshaft is an important component used in automobile engines. Its structure generally includes a main shaft, on which are provided a plurality of cams with different angles, and a notch on the end face of the main shaft. The right driving face of the notch is often used as the reference face for measuring data such as the phase angle. Therefore, measuring the reference face of the notch at the end of the camshaft is an important step in detecting the camshaft. The measuring instrument used is limited by the structural position and cannot directly use the reference face of the notch at the end of the camshaft. It is necessary to use the quantitative offset face of the reference face of the notch at the end of the camshaft as the measurement reference face. Therefore, how to quickly find the quantitative offset face of the reference face of the camshaft is particularly critical. Utility Model Content

[0003] In view of the defects of the above-mentioned prior art, the technical problem to be solved by the utility model is to provide a special-shaped pin which is easy to process and can quickly and accurately find the quantitative offset reference surface of the camshaft and a method of use.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: a detection part for quickly finding the quantitative offset reference surface of the camshaft, comprising a special-shaped pin, wherein the special-shaped pin is a cylindrical pin, and the cross-section of the special-shaped pin is symmetrical as a whole, and is surrounded by a concentrically arranged small diameter major arc segment, a large diameter minor arc segment, and two cut surfaces respectively connected to the small diameter major arc segment and the large diameter minor arc segment; the diameter of the small diameter major arc segment is smaller than the width of the camshaft end slot, the diameter of the large diameter minor arc segment is larger than the width of the camshaft end slot, and the radius of the small diameter major arc segment is exactly the quantitative offset value of the camshaft reference surface, so that the special-shaped pin can be inserted through the narrow part, and can be tightly fixed to the camshaft slot through the wide part after rotation, and when rotated into place, the small diameter major arc segment just rests on the camshaft reference surface of the camshaft end slot.

[0005] Preferably, a through hole is provided in the upper middle portion of the special-shaped pin, and the diameter of the through hole is smaller than the radius of the minor diameter major arc segment.

[0006] Preferably, the camshaft slot width is 3.08 mm, the diameter of the small diameter major arc segment is 3 mm, and the diameter of the large diameter minor arc segment is 3.4 mm.

[0007] Preferably, the through hole has a diameter of 1 mm.

[0008] Preferably, the length of the special-shaped pin is greater than the length of the camshaft slot.

[0009] Preferably, the section is a tangent of a small-diameter major arc segment, a large-diameter minor arc segment, or a larger-diameter circular arc segment.

[0010] The beneficial effects of the utility model are as follows: by providing a small diameter superior arc segment and a large diameter inferior arc segment, the special-shaped pin can be inserted into and fixed in the camshaft slot, the structure is simple and the operation is easy; by providing a small diameter superior arc segment with a radius the same as the detection offset quantity, the camshaft quantitative offset reference plane can be quickly and accurately found by detecting the center of the small diameter superior arc segment; the cylindrical special-shaped pin composed of a circular arc is easy to process, the production cost is low, and the processing cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 It is a front view of the utility model;

[0013] Figure 3 It is a top view of the utility model;

[0014] Figure 4 for Figure 3 A magnified view of part I;

[0015] Figure 5 This is a schematic diagram of the installation of the utility model;

[0016] Figure 6 This is a schematic diagram of the installation structure of the utility model;

[0017] In the figure: 1-special-shaped pin, 2-through hole, 3-section, 4-camshaft reference surface, A-small diameter superior arc segment, B-large diameter inferior arc segment. DETAILED DESCRIPTION

[0018] In order to better understand the improvements made by the present invention relative to the prior art, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0019] like Figure 1 As shown in FIG. 6 , a detection component for quickly finding the quantitative offset reference surface of the camshaft is mainly composed of a special-shaped pin 1.

[0020] The special-shaped pin 1 is a columnar pin, and a through hole 2 is provided in the upper part of the special-shaped pin 1, and a thin rod matching the diameter of the through hole 2 is provided, so as to facilitate insertion into the through hole 2 for operation. For the convenience of operation, the length of the special-shaped pin 1 is preferably greater than the length of the camshaft slot.

[0021] The cross section of the special-shaped pin 1 is symmetrical as a whole, and is formed by a concentrically arranged small diameter superior arc segment A, a large diameter inferior arc segment B, and two cut surfaces 2 respectively connected to the small diameter superior arc segment A and the large diameter inferior arc segment B. The cut surface 3 is preferably a tangent of the small diameter superior arc segment A and the large diameter inferior arc segment B or a larger diameter arc segment.

[0022] The diameter of the small diameter superior arc segment A is smaller than the width of the camshaft end slot, the diameter of the large diameter inferior arc segment B is larger than the width of the camshaft end slot, and the radius of the small diameter superior arc segment A is exactly the quantitative offset value of the camshaft reference surface 4, so that the special-shaped pin 1 can be inserted through the narrow part and can be tightly fixed with the camshaft slot through the wide part after rotation, and when rotated into place, the small diameter superior arc segment A just rests on the camshaft reference surface 4 of the camshaft end slot.

[0023] In use, the camshaft slot width is 3.08mm, the diameter of the small diameter superior arc segment A is 3mm, and the diameter of the large diameter inferior arc segment B is 3.4mm.

[0024] Using the profiled pin 1 to detect the camshaft quantitative offset reference surface includes the following steps:

[0025] Step 1: Insert the thin rod into the upper through hole 2 in the special-shaped pin 1, wherein the diameter of the through hole 2 is smaller than the radius of the minor diameter major arc segment A, and the diameter of the through hole 2 is 1 mm.

[0026] Step 2: Align the small diameter superior arc segment A with the bottom of the camshaft slot so that the special-shaped pin 1 is installed into the camshaft slot.

[0027] Step 3: Use the thin rod to rotate the special-shaped pin 1 until the special-shaped pin 1 is clamped and fixed with the camshaft groove, and the small diameter superior arc segment A contacts the camshaft reference surface.

[0028] Step 4: Place the camshaft on the ADCOLE detection position and use the probe to detect the center of the small diameter superior arc segment A to quickly find the position of the quantitative offset surface of the camshaft reference surface.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A detection part for quickly finding the quantitative offset reference surface of the camshaft, Features: The invention comprises a special-shaped pin (1), wherein the special-shaped pin (1) is a columnar pin, and the cross section of the special-shaped pin (1) is symmetrical on the left and right as a whole, and is formed by a concentrically arranged small diameter major arc segment (A), a large diameter minor arc segment (B), and two cut surfaces (3) respectively connected to the small diameter major arc segment (A) and the large diameter minor arc segment (B); the diameter of the small diameter major arc segment (A) is smaller than the width of the camshaft end slot, the diameter of the large diameter minor arc segment (B) is larger than the width of the camshaft end slot, and the radius of the small diameter major arc segment (A) is exactly the quantitative offset value of the camshaft reference surface (4), so that the special-shaped pin (1) can be inserted through the narrow part, and can be fixed to the camshaft slot through the wide part after rotation, and when rotated into place, the small diameter major arc segment (A) just abuts against the camshaft reference surface (4) of the camshaft end slot.

2. A detection component for quickly finding the quantitative deviation reference surface of a camshaft according to claim 1, Features: A through hole (2) is provided in the upper middle portion of the special-shaped pin (1), and the diameter of the through hole (2) is smaller than the radius of the minor-diameter major arc segment (A).

3. A detection member for quickly finding the quantitative deviation reference surface of a camshaft according to claim 1, Features: The camshaft slot width is 3.08 mm, the diameter of the small diameter superior arc segment (A) is 3 mm, and the diameter of the large diameter inferior arc segment (B) is 3.4 mm.

4. A detection member for quickly finding the quantitative deviation reference surface of a camshaft according to claim 2, Features: The through hole (2) has a diameter of 1 mm.

5. A detection member for quickly finding the quantitative deviation reference surface of a camshaft according to claim 1, Features: The length of the special-shaped pin (1) is greater than the length of the camshaft slot.

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