Timing tool for engine camshaft

Abstract

The invention relates to an engine camshaft timing tool. The tool frame comprises a tool frame body, a fixing base and a phase angle adjusting module, an avoiding groove is formed in the bottom of the tool frame body, a positioning groove is formed in the tool frame body, the phase angle adjusting module is rotationally restrained in the positioning groove, at least two screw holes are further formed in the positioning groove, bolts are connected to the screw holes in a screwed mode, and angle scale marks are further arranged on the tool frame body; the phase angle adjusting module is provided with an arc groove and a clamping groove, the phase angle adjusting module is provided with an indicating line coinciding with the center line, the bolts penetrate through the arc groove, and pressing nuts are formed at the outer ends of the bolts. The rotatable phase angle adjusting module is arranged on the tool frame body, and the clamping groove capable of being clamped with the square column section or the hexagonal prism section is formed in the phase angle adjusting module, so that the effect of reading the phase angle of the cam shaft in a trial mode is achieved, the tool frame is suitable for engine assembly in the research and development test stage, the overall result is simple, and use is easy and convenient.

Description

Technical Field

[0001] The present invention relates to a timing tooling, and particularly to a timing tooling for an engine camshaft. Background Art

[0002] With the rapid development of new energy vehicles, the development of range extenders has also been very rapid. As a key component in a range extender, the performance of the engine directly affects the performance of the range extender.

[0003] As is well known, the camshaft is one of the key components of the engine valve train, and it is mainly used to control the valve timing phase. To ensure the normal operation of the valve train, there are strict requirements for the angular position of the cams on the camshaft to ensure each valve timing phase in the working cycle. Thus, the accuracy of camshaft installation plays a crucial role.

[0004] Generally, special auxiliary tools are selected when installing the camshaft. For example, the camshaft timing tooling is a tool specifically used for assembling and positioning the camshaft. Today, with the increasing improvement of automobile manufacturing and assembly technologies, consumers' requirements for automobile engines are also getting higher and higher. To some extent, the positioning accuracy of the camshaft timing tooling will also significantly affect the performance of the engine. Therefore, the camshaft timing tooling is required to have a very high positioning accuracy.

[0005] For this reason, someone has publicly disclosed an invention patent named "Engine Camshaft Timing Tooling" (Publication No.: CN103831624B). The timing tooling includes a tooling main body and positioning elements, fastening elements, and timing pins provided on the tooling main body. The positioning elements are adapted to position the timing tooling on the cylinder head of the engine. The fastening elements are adapted to fasten the timing tooling on the cylinder head of the engine. The pin end of the timing pin is adapted to cooperate with the timing hole on the camshaft to achieve the timing positioning of the camshaft. Among them, the pin end of the timing pin and the timing hole of the camshaft are both provided as truncated cones, and the taper of the pin end is greater than the taper of the timing hole. The camshaft timing tooling of the present invention can improve the assembly accuracy and assembly efficiency of the engine timing system.

[0006] However, this timing tooling is actually only suitable for mass-produced camshafts, that is, corresponding timing holes have been provided on the camshaft. For the assembly of an engine in the R & D test stage, there are no corresponding timing holes on the camshaft, and this patent is not applicable. It is particularly important to confirm the phase angle of the camshaft during the engine test and development process. Therefore, designing a simple, new, and high-quality engine camshaft phase adjustment tooling is of great significance for ensuring the debugging of the engine phase and improving the overall performance of the engine. Summary of the Invention

[0007] The present invention provides an engine camshaft timing tooling, which solves the problem in the prior art that the existing camshaft timing tooling cannot be applied to the positioning of camshafts in the R & D test stage.

[0008] The above technical problem of the present invention is mainly solved by the following technical solution: An engine camshaft timing tooling, comprising: a tooling frame main body, two fixed seats provided on both sides of the bottom of the tooling frame main body, and a phase angle adjustment module. An avoidance groove is provided at the bottom of the tooling frame main body, and a positioning groove is provided on the tooling frame main body in the peripheral area of the avoidance groove. The phase angle adjustment module is rotationally constrained in the positioning groove. At least two screw holes are also provided in the positioning groove, and bolts are screwed on the screw holes. Angle scale lines are also provided on the tooling frame main body; An arc groove and a clamping groove are provided on the phase angle adjustment module. The center line of the clamping groove coincides with the rotation axis of the phase angle adjustment module, and an indication line coinciding with the center line is provided on the phase angle adjustment module. The bolts all penetrate through the arc groove, and a pressing nut is formed at the outer end of the bolt.

[0009] The size of the tooling frame main body and the distribution position of the fixed seats in the present invention need to correspond to the corresponding engine cylinder head. The distribution position, size, and quantity of the avoidance grooves are also adapted to the layout position and quantity of the actual engine camshaft. The usage method of the present invention is as follows: First, loosen the bolts on the phase angle adjustment module to ensure that the phase angle adjustment module can rotate in the positioning groove; Then place the tooling frame main body on the cylinder head, and make the square column section or hexagonal column section on the camshaft engage with the clamping groove on the phase angle adjustment module, and fix it with the cylinder head through the two fixed seats at the bottom. The specific fixing method can be bolt fixing, pin fixing, or other existing detachable fixing and assembly schemes; After the tooling frame main body is completely fixed, at this time, the rotation center of the phase angle adjustment module coincides with the axis of the camshaft. In this way, randomly rotating the camshaft will drive the phase angle adjustment module to rotate synchronously, and their phase angles are consistent. The deflection angle of the phase angle adjustment module can be obtained by reading the indication line and the angle scale line. Therefore, the real-time phase angle of the camshaft can be conveniently read through the present invention, which is convenient for engineers to adjust to the required angle. After the angle adjustment is completed, all the bolts need to be tightened to ensure that the phase angle adjustment module is completely fixed to the tooling frame main body. At this time, the camshaft is fixed, and the subsequent timing system installation can be carried out. After the timing system installation is completed, finally, the present invention is removed.

[0010] Therefore, the present invention has the following characteristics compared with the prior art: 1. The present invention utilizes the structure of the existing camshaft which has a square column section or a hexagonal column section by default. By setting a rotatable phase angle adjustment module on the main body of the tooling rack and setting a card slot on the phase angle adjustment module that can engage with the square column section or the hexagonal column section, the effect of reading the camshaft phase angle is achieved, which is applicable to the engine assembly in the R & D test stage. The overall structure is simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG. Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0012] FIG. Figure 2 is a schematic structural diagram after removing the phase angle adjustment module in Embodiment 1;

[0013] FIG. Figure 3 is a schematic structural diagram after fixing Embodiment 1 with the cylinder head;

[0014] FIG. Figure 4 is a schematic structural diagram of the phase angle adjustment module in Embodiment 3;

[0015] FIG. Figure 5 is a schematic structural diagram of the phase angle adjustment module in Embodiment 2. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions of the present invention will be further specifically described below through embodiments in conjunction with the drawings.

[0017] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0018] Embodiment 1: See Figure 1 and Figure 2, An engine camshaft timing tooling, comprising: a tooling frame main body 10, two fixed seats 20 provided on both sides of the bottom of the tooling frame main body, and a phase angle adjustment module 30. An avoidance groove 11 is provided at the bottom of the tooling frame main body. A positioning groove 12 is provided on the tooling frame main body in the peripheral area of the avoidance groove. The phase angle adjustment module is rotationally constrained in the positioning groove. There are also 4 to 6 screw holes 13 in the positioning groove, and bolts 14 are screwed on the screw holes. An angle scale line 15 is also provided on the tooling frame main body; an arc groove 31 and a clamping groove 32 are provided on the phase angle adjustment module. The center line of the clamping groove coincides with the rotation axis of the phase angle adjustment module, and an indicating line 33 coinciding with the center line is provided on the phase angle adjustment module. The bolts all penetrate through the arc groove, and a pressing nut 141 is formed at the outer end of the bolt.

[0019] See Figure 3 , This embodiment is applicable to an engine with a dual camshaft 1. A hexagonal prism section 11 is provided on the corresponding camshaft, and the camshaft is rotatably assembled on the cylinder head 2. The size of the tooling frame main body and the distribution position of the fixed seats in this embodiment need to correspond to the corresponding engine cylinder head. The distribution position, size, and quantity of the avoidance grooves are also adapted to the layout position and quantity of the actual engine camshaft. The usage method of this embodiment is as follows: First, loosen the bolts on the phase angle adjustment module to ensure that the phase angle adjustment module can rotate in the positioning groove; then place the tooling frame main body on the cylinder head, and make the hexagonal prism section on the camshaft engage with the clamping groove on the phase angle adjustment module, and fix it with the cylinder head through the two fixed seats at the bottom. The specific fixing method can be bolt fixing, pin fixing, or other existing detachable fixing and assembly schemes; after the tooling frame main body is completely fixed, at this time, the rotation center of the phase angle adjustment module coincides with the axis of the camshaft. In this way, randomly rotating the camshaft will drive the phase angle adjustment module to rotate synchronously, and their phase angles are the same. The deflection angle of the phase angle adjustment module can be obtained by reading the indicating line and the angle scale line. Therefore, the real-time phase angle of the camshaft can be conveniently read through this embodiment, which is convenient for engineers to adjust to the required angle. After the angle adjustment is completed, all the bolts need to be tightened to ensure that the phase angle adjustment module is completely fixed to the tooling frame main body. At this time, the camshaft is fixed, and the subsequent timing system installation can be carried out. After the timing system installation is completed, finally, this embodiment is removed.

[0020] Specifically, the two side walls of the clamping groove are parallel to each other and symmetric about the indicating line, and the width is 24.5 mm; the arc groove is divided into a first arc groove 311, a second arc groove 312, a third arc groove 313, and a fourth arc groove 314. The four arc grooves are symmetrically distributed about the indicating line, and the corresponding radian is 40°, 30°, 30°, 40°; the fixed seat is vertically fixed to the tooling frame main body, and two positioning holes 21 are also provided on each fixed seat. Positioning bolts can be installed in the positioning holes for screwing and fixing with the cylinder head.

[0021] Embodiment 2: SeeFigure 5 , which is different from Example 1 in that there are two arc grooves, symmetrically distributed with respect to the indication line, and the radian is between 60°±10°.

[0022] Example 3: See Figure 4 , which is different from Example 1 in that there is one arc groove, symmetrically distributed with respect to the indication line, and the radian is 140°±10°.

[0023] It will be obvious to those skilled in the art that the present invention can be changed in various ways, and such changes are not considered to depart from the scope of the present invention. All such modifications obvious to those skilled in the art will be included within the scope of the present claims.

Claims

1. An engine camshaft timing tooling, characterized in that Including: A tooling rack main body, two fixed seats provided on both sides of the bottom of the tooling rack main body, and a phase angle adjustment module. An avoidance groove is provided at the bottom of the tooling rack main body. A positioning groove is provided on the tooling rack main body in the peripheral area of the avoidance groove. The phase angle adjustment module is rotationally constrained in the positioning groove. At least two screw holes are also provided in the positioning groove, and bolts are screwed on the screw holes. Angle scale lines are also provided on the tooling rack main body. An arc groove and a clamping groove are provided on the phase angle adjustment module. The center line of the clamping groove coincides with the rotation axis of the phase angle adjustment module, and an indicating line coinciding with the center line is provided on the phase angle adjustment module. The bolts all penetrate through the arc groove, and a pressing nut is formed at the outer end of the bolt.

2. The engine camshaft timing tooling according to claim 1, wherein: The two side walls of the clamping groove are parallel to each other and symmetric about the indicating line.

3. The engine camshaft timing tooling according to claim 1 or 2, characterized in that: There is one arc groove, and the radian is between 90° and 180°.

4. The engine camshaft timing tooling according to claim 1 or 2, characterized in that: There are two arc grooves, and they are symmetrically distributed about the indicating line, and the radian is between 30° and 90°.

5. The engine camshaft timing tooling according to claim 1 or 2, characterized in that: The arc groove is divided into a first arc groove, a second arc groove, a third arc groove and a fourth arc groove. The four arc grooves are symmetrically distributed about the indicating line, and the radian of any one arc groove is between 20° and 45°.

6. The engine camshaft timing tooling according to claim 1, characterized in that: The fixed seat is vertically fixed to the tooling rack main body, and two positioning holes are also provided on the fixed seat.

Images