Placing device for cylindricity detection of piston pin hole of engine and detection assembly with placing device for cylindricity detection of piston pin hole

Abstract

The utility model relates to the field of detection equipment, in particular to a placing device for cylindricity detection of a piston pin hole of an engine and a detection assembly with the placing device. The supporting structure comprises a base, and two oppositely-distributed side pressing mechanisms are arranged on the base. The side pressing mechanism comprises a side plate for limiting the end part of the to-be-tested piston; the side plates in the two side pressing mechanisms extrude and fix the piston to be tested; according to the utility model, through the arrangement of the supporting structure, the to-be-detected piston can be conveniently placed and fixed, and then the subsequent detection operation of the piston is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of detection equipment, in particular to a placing device for detecting the cylindricity of an engine piston pin hole and a detection assembly for detecting the cylindricity of a piston pin hole with the placing device. Background Technique

[0002] In the manufacturing process of automobile engines, it is necessary to precisely measure the cylindricity error of the pin holes of the pistons, which are key components of the engine.

[0003] An automobile piston is composed of three parts: a top, a head, and a skirt. Its basic shape is a cylindrical barrel with a gradually increasing diameter from top to bottom. The piston head is the part above the piston ring grooves for installing piston rings, and the piston skirt refers to the part from the lower end face of the oil ring groove to the piston bottom surface. When the piston moves, the piston head constantly makes small swings centered on the piston pin. To minimize the swings of the piston head as much as possible, the skirt is made elliptical.

[0004] Two pin holes are provided between the upper part of the skirt and the oil ring groove, and the piston pin is installed in the pin seat holes.

[0005] With the rapid development of modern engines, the processing accuracy of pistons is getting higher and higher, especially the requirements for detecting the roundness and cylindricity of the pin holes on the pistons are becoming more and more strict. When using a roundness meter to detect the pin holes, since the piston is a special-shaped part, the clamping device of the roundness meter cannot accurately and firmly clamp the piston, greatly reducing the measurement accuracy of the roundness meter.

[0006] For example, the content disclosed in Patent 201810123245.1 - A method for detecting the special-shaped pin holes of a piston on a roundness meter.

[0007] Therefore, in order to improve at least one of the above problems, an auxiliary tool is needed to assist in fixing the piston. Content of the Utility Model

[0008] The purpose of the utility model is to provide a placing device that facilitates the placement and fixation of an engine piston to be measured.

[0009] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0010] A placing device for detecting the cylindricity of an engine piston pin hole includes a support structure;

[0011] The support structure includes a base, and two relatively distributed side pressing mechanisms are provided on the base; each side pressing mechanism includes a side plate for limiting the end of the piston to be measured;

[0012] The side plates in the two side pressing mechanisms squeeze and fix the piston to be measured.

[0013] An extrusion mechanism is provided on the side plate. The extrusion mechanism includes a movable pressure plate provided on the side plate; the side plate extrudes the piston to be measured through the movable pressure plate.

[0014] The movable pressure plate is connected to the side plate through a pushing member. The pushing member includes an upper clamping screw provided on the side plate; the upper clamping screw presses against or is directly connected to the movable pressure plate.

[0015] The side plate includes a longitudinal side plate and a transverse side plate. The longitudinal side plate is connected to the base through the transverse side plate.

[0016] The transverse side plate is connected to the base through a fastening member. The fastening member includes a mounting and fixing hole provided on the transverse side plate, and a lower fastening bolt is provided in the mounting and fixing hole.

[0017] The mounting and fixing hole is an oval hole.

[0018] A detection assembly for detecting the cylindricity of a piston pin hole includes the placement device and a piston pin.

[0019] The advantages of the present utility model are as follows:

[0020] The present utility model discloses a placement device for detecting the cylindricity of an engine piston pin hole and a detection assembly for detecting the cylindricity of a piston pin hole having the placement device.

[0021] Through the setting of the support structure, the present utility model facilitates the placement and fixation of the piston to be measured, and then facilitates the subsequent detection operation of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following briefly describes the content expressed in each drawing of the specification of the present utility model and the marks in the drawings:

[0023] Figure 1 is a schematic structural diagram of the present utility model.

[0024] Figure 2 is an exploded view of the present utility model.

[0025] The marks in the above drawings are all:

[0026] 1, base; 2, side pressing mechanism; 3, piston to be measured. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following further describes the specific embodiments of the present utility model in detail by describing the optimal embodiments with reference to the drawings.

[0028] A placement device for detecting the cylindricity of an engine piston pin hole. The placement device disclosed by the present utility model facilitates the placement and fixation of the piston 3 to be measured, and then facilitates the subsequent detection operation of the piston 3.

[0029] The placement device disclosed by the present utility model mainly includes a support structure; the support structure is the main structure of the placement device; in the present utility model, the support structure includes a base 1, and two relatively distributed side pressing mechanisms 2 are provided on the base 1; the side pressing mechanism 2 includes a side plate 21 for end-limiting the piston 3 to be measured; the base 1 is a disc structure, which facilitates the installation and fixation of the side pressing mechanism 2. The present utility model realizes the extrusion and fixation of the piston 3 to be measured through the combined use of two side pressing mechanisms 2.

[0030] In addition, in the present utility model, each side pressing mechanism 2 includes a side plate 21 provided on the base 1. The side plate 21 plays a role of supporting and elevating. During subsequent use, the side plates 21 in the two side pressing mechanisms 2 squeeze and fix the piston 3 to be measured; thus, the stability of the placement position of the piston 3 to be measured is well guaranteed; ultimately, it facilitates subsequent detection operations.

[0031] Furthermore, in the present utility model, an extrusion mechanism is provided on the side plate 21. The setting of the extrusion mechanism facilitates providing an extrusion force to the piston 3, and then better facilitates the extrusion and fixation of the piston 3; at the same time, in the present utility model, the extrusion mechanism includes a movable pressing plate 23 provided on the side plate 21; the side plate 21 squeezes the piston 3 to be measured through the movable pressing plate 23; the movable pressing plate 23 is a plate body structure that can move horizontally, which facilitates the combined action of the movable pressing plates 23 in the two side pressing mechanisms 2 to realize the extrusion and fixation of the piston 3.

[0032] Furthermore, in the present utility model, the movable pressing plate 23 is connected to the side plate 21 through a pushing component. The pushing component includes an upper clamping screw 24 provided on the side plate 21; the upper clamping screw 24 abuts against or is directly connected to the movable pressing plate 23; the setting of the pushing component facilitates providing a driving force to the movable pressing plate 23, so as to realize the extrusion and fixation of the piston 3 through the mutual extrusion of the two movable pressing plates 23.

[0033] Furthermore, in the present utility model, the side plate 21 includes a longitudinal side plate 211 and a transverse side plate 212. The longitudinal side plate 211 is connected to the base 1 through the transverse side plate 212; based on such a setting, the side plate 21 forms an L-shaped plate body structure; the longitudinal side plate 211 plays a role of supporting and elevating, and the setting of the transverse side plate 212 increases the contact area between the transverse side plate 212 and the base 1, and better guarantees the stability of the placement of the side plate 21 on the base 1.

[0034] Furthermore, in the present utility model, the transverse side plate 212 is connected to the base 1 through a fastening component. The fastening component includes an installation and fixation hole 22 provided on the transverse side plate 212, and a lower fastening bolt 25 is provided in the installation and fixation hole 22; based on such a setting, it facilitates the installation and fixation of the side plate 21 on the base 1.

[0035] In the present utility model, the mounting and fixing holes 22 are waist-shaped holes; the provision of the waist-shaped holes in the present utility model facilitates the lateral movement of the side plates 21 on the base 1, and thus the interval between the two side pressing mechanisms 2 can be adjusted as required.

[0036] A detection assembly for detecting the cylindricity of a piston pin hole includes the placement device and a piston pin 4; in the present utility model, the placement device is used to mount and fasten the piston 3 to be measured; after the piston 3 to be measured is installed, it is judged whether the piston pin hole cylindricity meets the design requirements by whether the piston pin 4 can pass through the piston 3.

[0037] Specifically:

[0038] The placement device disclosed in the present utility model mainly includes a base 1, side plates 21, a movable pressing plate 23 and upper fastening bolts.

[0039] In the present utility model, the piston 3 is initially centered on the original hexagonal chuck by using the piston pin 4, and then the two screws on the side plates 21 of the device of the present utility model are used to push the pressing plates on both sides to press and fix the piston 3. After the piston 3 is fixed, the original positioning chuck is loosened and the original positioning piston pin 4 is withdrawn, so as to realize the simultaneous measurement of the two side pin holes.

[0040] First, one end of a piston pin 4 of a corresponding specification is inserted into one side pin hole (only a partial length needs to be inserted, and the purpose is to facilitate initial centering and leveling), and the other piston pin 4 is clamped by a six-jaw chuck (only a partial length needs to be clamped), and a certain gap is left at the bottom of the chuck (so as to withdraw the original positioning piston pin 4 later). The fixing device of the present utility model is placed, the positions of the two clamping plates are adjusted to contact the top and bottom of the piston 3; then through two clamping screws, the pressing plate is gently pressed against the piston 3 to make contact, and it is pressed and fixed.

[0041] The original positioning hexagonal chuck is loosened, so that the original positioning piston pin 4 falls to the bottom of the chuck, releasing the position of the piston pin hole; in this way, the cylindricity error of the two side pin holes of the piston 3 can be measured in full shape (bilaterally).

[0042] Obviously, the specific implementation of the present utility model is not limited by the above methods. As long as various non-substantial improvements are made by adopting the method concept and technical solution of the present utility model, they are all within the protection scope of the present utility model.

Claims

1. A placement device for detecting the cylindricity of an engine piston pin hole, characterized in that: It comprises a supporting structure; the supporting structure comprises a base, and two relatively distributed side pressure mechanisms are arranged on the base; the side pressure mechanism comprises a side plate for limiting the end position of the piston to be tested; The side plates in the two side pressure mechanisms squeeze and fix the piston to be tested.

2. The placement device for detecting the cylindricity of an engine piston pin hole according to claim 1, characterized in that: The side plate is provided with a squeezing mechanism, and the squeezing mechanism comprises a movable pressing plate arranged on the side plate; the side plate squeezes the piston to be tested through the movable pressing plate.

3. The placement device for detecting the cylindricity of an engine piston pin hole according to claim 2, characterized in that: The movable pressing plate is connected to the side plate through a pushing component, and the pushing component includes an upper clamping screw arranged on the side plate; the upper clamping screw presses against or is directly connected to the movable pressing plate.

4. The placement device for detecting the cylindricity of an engine piston pin hole according to claim 1, characterized in that: The side panels include longitudinal side panels and transverse side panels, and the longitudinal side panels are connected to the base via the transverse side panels.

5. The placement device for detecting the cylindricity of an engine piston pin hole according to claim 4, characterized in that: The lateral side plate is connected to the base through a fastening component. The fastening component includes an installation and fixing hole arranged on the lateral side plate. A lower fastening bolt is arranged in the installation and fixing hole.

6. A placement device for detecting the cylindricity of an engine piston pin hole according to claim 5, characterized in that: The installation and fixing hole is a waist-shaped hole.

7. A detection assembly for detecting the cylindricity of a piston pin hole, characterized in that: It comprises a placement device as described in any one of claims 1 to 6 and a piston pin.

Images