CN205843581U - Automobile engine cylinder head valve guide bushing coaxiality check fixture - Google Patents

Abstract

The utility model discloses a coaxiality inspection tool for a cylinder head valve guide of an automobile engine, which comprises a first detection part used for inserting into the valve guide and a preset detection part connected with the first detection part and used for detecting the cylinder head of the engine. A second detection unit for whether there is a deviation between the references. The vehicle engine cylinder head valve guide coaxiality inspection tool of the utility model has simple structure and convenient operation. It only needs to be inserted into the valve guide for each inspection. If the valve guide is coaxial with the valve guide hole on the cylinder head If the accuracy does not meet the tolerance requirements, the inspection tool can be detected quickly and easily. Compared with the traditional detection method, not only the detection accuracy is high, but also the detection efficiency is high.

Description

Automobile engine cylinder head valve guide coaxiality inspection tool

technical field

The utility model belongs to the technical field of checking tools, in particular, the utility model relates to a checking tool for the coaxiality of an automobile engine cylinder head valve guide and a testing method thereof.

Background technique

The valve guide is a very important part in the cylinder head of the automobile engine, and its machining accuracy directly affects the working performance and efficiency of the engine. If the position of the valve guide is deviated during processing or installation, in addition to harmful heat conduction and rapid wear of the guide hole, it will also cause an increase in fuel consumption. Therefore, the processing accuracy of the valve guide hole is generally very high, especially the coaxiality between the valve guide hole and the outer wall of the guide tube has strict tolerance requirements, and the detection of the coaxiality is particularly important.

Because the valve guide hole of the cylinder head of the automobile engine is generally inclined at a certain angle, it is difficult to detect the coaxiality of this angle, and the error of the traditional detection method is relatively large, so that there are many actual false detections, and the detection efficiency Not high either.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the present invention provides an automobile engine cylinder head valve guide coaxiality inspection tool and a detection method thereof, with the purpose of improving detection efficiency and detection accuracy.

In order to achieve the above object, the technical solution adopted by the present invention is: the coaxiality checker of the cylinder head valve guide of an automobile engine, including a first detection part for inserting into the valve guide and being connected with the first detection part and used for detecting A second detection part for whether there is a deviation between the preset references on the cylinder head.

The first detection part includes a detection rod, and the diameter of the detection rod is equal to the diameter of the central hole of the valve guide.

The first detection part further includes a reinforcing rod connected with the detection rod and the second detection part.

The reinforcing rod is coaxially connected with the detection rod.

The diameter of the reinforcing rod is larger than that of the detecting rod.

The length of the detection rod is greater than the length of the reinforcing rod.

The second detection part has a supporting surface connected with the first detection part and used to contact the valve seat on the engine cylinder head, and a bearing surface used to detect whether there is a deviation from a preset reference on the engine cylinder head. As for the detection surface, the preset reference is a surface on the engine cylinder head with an included angle smaller than 90 degrees with the axis of the valve guide.

The detection surface is a conical surface coaxial with the detection rod, and the support surface is a circular plane coaxial with the detection surface.

The second detection part has a conical structure, the detection surface is one end surface of the second detection part, and the supporting surface is the other end surface of the second detection part.

The present invention also provides a method for detecting the coaxiality of the cylinder head valve guide of an automobile engine. Using the above checking tool, when testing, insert the first testing part of the checking tool into the central hole of the valve guide, and make the second testing part Contact the valve seat ring on the engine cylinder head, and finally judge whether the coaxiality of the valve guide and the valve guide hole meets the requirements by observing whether there is a deviation between the second detection part and the preset reference on the engine cylinder head.

The automobile engine cylinder head valve guide coaxiality inspection tool of the present invention has simple structure and convenient operation. It only needs to be inserted into the valve guide for each inspection. If the coaxiality of the valve guide and the valve guide hole on the cylinder head is If the tolerance requirements are not met, the inspection tool can be quickly and easily detected. Compared with the traditional detection method, not only the detection accuracy is high, but also the detection efficiency is high; in addition, the detection method using the inspection tool is simple in process, convenient and efficient in operation, The employees who detect the product can go to work without training, and the detection efficiency is high.

Description of drawings

This manual includes the following drawings, the contents shown are:

Fig. 1 is a schematic structural view of the inspection fixture of the present invention;

Fig. 2 is a diagram of the use state of the inspection fixture of the present invention;

Labeled in the figure:

1. Valve seat ring; 2. Checking tool; 201. Detection rod; 202. Reinforcing rod; 203. Second detection part; 204. Detection surface; 205. Support surface; 206. Plug hole; 3. Valve guide; 4 , Engine cylinder head; 5, Preset benchmark.

detailed description

The specific embodiment of the present invention will be described in further detail by describing the embodiments below with reference to the accompanying drawings, the purpose is to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and contribute to its implementation.

As shown in Figures 1 and 2, the present invention provides a vehicle engine cylinder head valve guide coaxiality tester, including a first detection part for inserting into the valve guide 3 and being connected with the first detection part and used for A second detection part 203 that detects whether there is a deviation from the preset reference 5 on the engine cylinder head.

Specifically, as shown in Fig. 1 and Fig. 2, the valve guide 3 is installed in the valve guide hole of the engine cylinder head and is a circular tube with both ends open and a hollow inside. The detection rod 201 in the central hole is a long round rod, and the diameter of the detection rod 201 is equal to the diameter of the central hole of the valve guide.

Preferably, as shown in Figure 1, the first detection part also includes a reinforcing rod 202 connected to the detection rod 201 and the second detection part 203, one end of the reinforcing rod 202 is fixedly connected to the detection rod 201, and the other end is connected to the second detection rod 203. Part 203 is fixedly connected. The reinforcing rod 202 plays the role of strengthening the rigidity of the inspection tool. The reinforcing rod 202 is also a round rod. The reinforcing rod 202 and the detection rod 201 are coaxially fixedly connected. greater than the length of the reinforcing rod 202.

As preferably, as shown in Figure 1, the second detection portion 203 is an umbrella-shaped cone, and the second detection portion 203 of the conical structure has a valve seat ring connected to the first detection portion and used to connect the engine cylinder head. 1 contact bearing surface 205 and a detection surface 204 for detecting whether there is a deviation from a preset reference 5 on the engine cylinder head. As shown in Figure 2, the valve guide hole is inclined inside the engine cylinder head, the axis of the valve guide hole intersects with the bottom surface of the engine cylinder head, and the angle between the two is less than 90 degrees. The preset reference 5 is the engine cylinder The surface on the cover has an included angle of less than 90 degrees with the axis of the valve guide hole, so the bottom surface of the engine cylinder head can be selected as the preset reference 5. The top face of the body clamps against the flat face of the gasket.

As shown in Figure 1, the detection surface 204 is the one end surface of the second detection part 203, and the support surface 205 is the other end surface of the second detection part 203, and the detection surface 204 is a conical surface coaxial with the first detection part, and the support surface 205 is a circular plane coaxial with the detection surface 204 . The detection surface 204 and the support surface 205 are coaxial with the reinforcement rod 202 and the detection rod 201 of the first detection part, and the support surface 205 is fixedly connected with the reinforcement rod 202, and the support surface 205 and the reinforcement rod 202 are located between the detection surface 204 and the detection rod 201 between. On the second detection part 203, the end portion where the detection surface 204 is located is a structure protruding outward relative to the other end, the outer diameter of the detection surface 204 is equal to the outer diameter of the support surface 205, and the center of circle of the detection surface 204 is the same as the support surface. The vertical distance between the centers of circles 205 is larger than the vertical distance between the edge of the detection surface 204 and the edge of the support surface 205 . The sum of the included angle between the generatrix of the detection surface 204 and the supporting surface 205 and the coaxiality of the valve guide and the valve guide hole meets the requirements, and the sum of the included angle between the valve guide hole on the engine cylinder head and the bottom surface of the engine cylinder head is equal to 90 degrees. During detection, by observing whether there is a deviation between the detection surface 204 and the preset reference 5 on the engine cylinder head, it is judged whether the coaxiality of the valve guide and the valve guide hole meets the requirements.

Preferably, as shown in FIG. 1, a plug-in hole 206 is provided on the second detection part 203, and the plug-in hole 206 is a hole extending from the center of the detection surface of the second detection part to the inside of the reinforcing rod in the axial direction. Threaded hole, the insertion and extraction hole 206 is used to allow the screw to be inserted, so that after the inspection is completed, the inspector can pull out the inspection tool from the valve guide through the screw.

The present invention also provides a method for detecting the coaxiality of the cylinder head valve guide of an automobile engine. When using the inspection tool with the above-mentioned structure, the engine cylinder head is first placed horizontally and the bottom surface of the engine cylinder head faces upwards, and then the inspection tool is placed The detection rod 201 of the first detection part of the tool passes through the valve seat ring 1 on the engine cylinder head and is inserted into the central hole of the valve guide until the bearing surface 205 of the second detection part 203 and the valve seat ring on the engine cylinder head 1 contact, and finally by observing whether there is a deviation between the detection surface 204 and the preset reference 5 on the engine cylinder head, it is judged whether the coaxiality of the valve guide and the valve guide hole meets the requirements.

As shown in Figure 2, after the inspection tool is inserted into the valve guide, the inspection tool is in an inclined state, and the engine cylinder head is placed horizontally. When observing whether there is a deviation between the preset reference 5 on the detection surface 204 and the engine cylinder head, if there is a busbar on the detection surface 204 that is horizontal and the bottom surface of the busbar and the engine cylinder head is in the same plane, the detection surface 204 If the busbar coincides with the preset datum 5, the coaxiality of the valve guide and the valve guide hole meets the tolerance requirements. If no generatrix on the detection surface 204 can coincide with the preset reference 5 , it means that the concentricity between the valve and the valve guide hole does not meet the tolerance requirement.

The present invention has been exemplarily described above with reference to the accompanying drawings. Apparently, the specific implementation of the present invention is not limited by the above methods. As long as various insubstantial improvements are made using the method concept and technical solution of the present invention; or without improvement, the above-mentioned concept and technical solution of the present invention are directly applied to other occasions, all within the protection scope of the present invention within.

Claims (9)

1. automobile engine cylinder head valve guide bushing coaxiality check fixture, it is characterised in that: include for inserting in valve guide bushing One test section and be connected with the first test section and for detection with engine cylinder lid on preset reference between whether there is deviation The second test section.

Automobile engine cylinder head valve guide bushing coaxiality check fixture the most according to claim 1, it is characterised in that: described first Test section includes detecting bar, and the diameter of detection bar is equal in magnitude with the center-hole diameter of valve guide bushing.

Automobile engine cylinder head valve guide bushing coaxiality check fixture the most according to claim 2, it is characterised in that: described first Test section also includes the bracing piece being connected with described detection bar and described second test section.

Automobile engine cylinder head valve guide bushing coaxiality check fixture the most according to claim 3, it is characterised in that: described reinforcement Bar is coaxially connected with described detection bar.

Automobile engine cylinder head valve guide bushing coaxiality check fixture the most according to claim 3, it is characterised in that: described reinforcement The diameter of bar is more than the diameter of described detection bar.

Automobile engine cylinder head valve guide bushing coaxiality check fixture the most according to claim 3, it is characterised in that: described detection The length of bar is more than the length of described bracing piece.

Automobile engine cylinder head valve guide bushing coaxiality check fixture the most according to claim 2, it is characterised in that: described second Test section have with described first test section connect and for the bearing-surface contacted with the valve retainer on engine cylinder lid and use Whether there is the detection faces of deviation between preset reference in detection and engine cylinder lid, preset reference is on engine cylinder lid And there is between the axis of valve guide bushing the surface less than 90 degree of angles.

Automobile engine cylinder head valve guide bushing coaxiality check fixture the most according to claim 7, it is characterised in that: described detection Face is the taper seat coaxial with described detection bar, and described bearing-surface is the disk coaxial with detection faces.

9. according to the automobile engine cylinder head valve guide bushing coaxiality check fixture described in claim 7 or 8, it is characterised in that: described Second test section is conical structure, and described detection faces is the second test section end surface, and described bearing-surface is the second test section Other end surface.