Fine boring clamp for automobile connecting rod

Abstract

The utility model relates to the technical field of fine boring fixtures, and discloses a fine boring fixture for an automobile connecting rod, which comprises a bottom plate, a side plate fixedly connected to the top of the bottom plate, a support plate fixedly connected to the top of the side plate, a top plate fixedly connected to the top of the side plate, and a motor fixedly connected to the top of the bottom plate. The output end of the motor is fixedly connected with a threaded rod, the outer wall of the threaded rod is in threaded connection with a threaded cylinder, the top end of the threaded cylinder is fixedly connected with a supporting table, the bottom end of the supporting table is fixedly connected with a sliding cylinder, the top of the top plate is fixedly connected with a sliding rod, and the top of the top plate is fixedly connected with a first telescopic rod. The top end of the first telescopic rod is rotationally connected with a movable block, the outer wall of the movable block is rotationally connected with a first movable plate, and one side of the first movable plate is fixedly connected with a large-end pressing plate. According to the fine boring clamp for the automobile connecting rod, one-time clamping and positioning can be achieved, the height difference of the two ends of the connecting rod is not affected, and the form and location tolerance requirement of parts can be effectively met.

Description

Technical Field

[0001] This utility model relates to the field of precision boring fixture technology, specifically a precision boring fixture for automotive connecting rods. Background Technology

[0002] In the complex structure of a car engine, the connecting rod is a crucial yet often overlooked component. Like a loyal messenger, it precisely transmits power between the piston and crankshaft, ensuring the engine operates efficiently and stably; it is a key part of the car's powertrain.

[0003] Generally, connecting rods are divided into a large-hole end plane and a small-hole end plane. The thickness of the two ends is sometimes the same, and sometimes one side is thicker than the other. Because the positioning height of the fixture has a tolerance, and the thickness of the two ends of the connecting rod itself has a symmetry tolerance, the two end planes of the connecting rod may not be on the same horizontal plane after the connecting rod is installed and positioned. This makes it difficult to control the parallelism of the precision boring process. Utility Model Content

[0004] The purpose of this invention is to provide a precision boring fixture for automotive connecting rods to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a precision boring jig for automotive connecting rods, comprising a base plate, a side plate fixedly connected to the top of the base plate, a support plate fixedly connected to the top of the side plate, and a top plate fixedly connected to the top of the side plate;

[0006] A motor is fixedly connected to the top of the base plate. A threaded rod is fixedly connected to the output end of the motor. A threaded cylinder is threadedly connected to the outer wall of the threaded rod. A support platform is fixedly connected to the top of the threaded cylinder. A sliding cylinder is fixedly connected to the bottom end of the support platform. A sliding rod is fixedly connected to the top of the top plate. A telescopic rod one is fixedly connected to the top of the top plate. A movable block is rotatably connected to the top of the telescopic rod one. A movable plate one is rotatably connected to the outer wall of the movable block. A large end pressure plate is fixedly connected to one side of the movable plate one. A small end positioning pin is fixedly connected to the top of the support platform. A telescopic rod two is fixedly connected to the top of the top plate. A floating support is provided inside the support plate. A large end pad is fixedly connected to the top of the top plate. A workpiece is placed on the top of the large end pad. A small end pressure plate is rotatably connected to the top of the telescopic rod two. A movable plate two is fixedly connected to the top of the telescopic rod two. A large end positioning pin is provided inside the large end pad.

[0007] Preferably, the small end pressure plate is rotatably connected to the inner side of the movable plate two, so that the telescopic rod two can drive the small end pressure plate to change its angle.

[0008] Preferably, the workpiece is disposed at the bottom of the large end pressure plate, the workpiece is movably connected to the outer wall of the large end positioning pin, and the workpiece is disposed at the top of the floating support.

[0009] Preferably, the movable plate is located at the top of the telescopic rod, allowing the movable block to change its angle, and the movable plate can serve as a limiting device.

[0010] Preferably, the support plate has a circular hole inside, and the threaded cylinder passes through the circular hole and moves, so that the threaded cylinder can move through the circular hole.

[0011] Preferably, the shape of the outer wall of the slide rod matches the shape of the inner wall of the slide cylinder, and the slide cylinder is slidably connected to the outer wall of the slide rod, so that the slide cylinder can be stably slidably limited on the outer wall of the slide rod.

[0012] Compared with the prior art, this utility model provides a precision boring jig for automotive connecting rods, which has the following advantages:

[0013] 1. The precision boring fixture for this automotive connecting rod can achieve one-time clamping and positioning, and ensure that the height difference between the two ends of the connecting rod is not affected, thus effectively guaranteeing the form and position tolerance requirements of the parts.

[0014] 2. The precision boring fixture for this automotive connecting rod solves the problem of inconsistent heights of the two end planes ground by the double-end face grinder, which affects the parallelism of the precision boring process. The improved parallelism pass rate leads to an improved overall pass rate for the connecting rod. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a front view of the structure of this utility model;

[0017] Figure 2 This is a left view of the structure of this utility model;

[0018] Figure 3 This is a right view of the structure of this utility model;

[0019] Figure 4 This is a bottom view of the base plate.

[0020] In the diagram: 1. Workpiece; 2. Small end locating pin; 3. Floating support; 4. Small end pressure plate; 5. Large end pad; 6. Large end locating pin; 7. Large end pressure plate; 8. Base plate; 9. Side plate; 10. Support plate; 11. Top plate; 12. Motor; 13. Threaded rod; 14. Threaded cylinder; 15. Support platform; 16. Slide cylinder; 17. Slide rod; 18. Telescopic rod one; 19. Movable block; 20. Movable plate one; 21. Telescopic rod two; 22. Movable plate two. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0023] This utility model provides the following technical solution:

[0024] Combination Figures 1 to 4 A precision boring jig for automotive connecting rods includes a base plate 8, a side plate 9 fixedly connected to the top of the base plate 8, a support plate 10 fixedly connected to the top of the side plate 9, and a top plate 11 fixedly connected to the top of the side plate 9.

[0025] A motor 12 is fixedly connected to the top of the base plate 8. A threaded rod 13 is fixedly connected to the output end of the motor 12. A threaded cylinder 14 is threadedly connected to the outer wall of the threaded rod 13. A support platform 15 is fixedly connected to the top of the threaded cylinder 14. A slide cylinder 16 is fixedly connected to the bottom of the support platform 15. A slide rod 17 is fixedly connected to the top of the top plate 11. A telescopic rod 18 is fixedly connected to the top of the telescopic rod 18. A movable block 19 is rotatably connected to the top of the telescopic rod 18. A movable plate 20 is rotatably connected to the outer wall of the movable block 19. A large end pressure plate 7 is fixedly connected to one side of the movable plate 20. A small end positioning pin 2 is fixedly connected to the top of the support platform 15. A telescopic rod 21 is fixedly connected to the top of the top plate 11. A floating support 3 is set inside the support plate 10. A large end pad 5 is fixedly connected to the top of the top plate 11. A workpiece 1 is set on the top of the large end pad 5. A small end pressure plate 4 is rotatably connected to the top of the telescopic rod 21. A movable plate 22 is fixedly connected to the top of the telescopic rod 21. A large end positioning pin 6 is set inside the large end pad 5.

[0026] Furthermore, the small end pressure plate 4 is rotatably connected to the inner side of the movable plate 22, so that the telescopic rod 21 can drive the small end pressure plate 4 to change its angle.

[0027] Furthermore, workpiece 1 is located at the bottom of the large end pressure plate 7, workpiece 1 is movably connected to the outer wall of the large end positioning pin 6, and workpiece 1 is located at the top of the floating support 3.

[0028] Furthermore, the movable plate 20 is located at the top of the telescopic rod 18, allowing the movable block 19 to change its angle, and the movable plate 20 can serve as a limit.

[0029] Furthermore, the support plate 10 has a circular hole inside, through which the threaded cylinder 14 passes and moves, allowing the threaded cylinder 14 to move through the circular hole.

[0030] Furthermore, the outer wall shape of the slide rod 17 matches the inner wall shape of the slide cylinder 16, and the slide cylinder 16 is slidably connected to the outer wall of the slide rod 17, so that the slide cylinder 16 can be stably slidably limited on the outer wall of the slide rod 17.

[0031] Determine the positioning method for the large hole:

[0032] To facilitate workpiece placement, the large hole is designed with expansion pins for positioning, and the gap between the expansion pins can be 0.3-0.4mm;

[0033] Because the large hole needs to be machined, the expansion pin needs to be pulled down after positioning to make room for machining;

[0034] Next, consider the pinhole positioning method:

[0035] If both the large and small holes are expanded with pins, the workpiece will move with the side subjected to greater force. Therefore, only the large hole expansion pin is designed, and the small hole is designed as a fixing pin, but it should be diamond-shaped, only controlling the radial restriction. The copper bushing allowance is only 0.4-0.5mm, and the pin gap should not be too large, otherwise it will not be able to be machined or will be machined off-center.

[0036] Even small holes need to be machined, so the small hole locating pin needs to be pulled down to make room for machining.

[0037] The last step is the crucial one:

[0038] After the large and small holes are positioned, the large end plane is also positioned. Because the small end plane is uneven, a hydraulic support cylinder needs to be designed to quickly push up before the small end pressure plate presses down, but it cannot push the workpiece. When it touches the workpiece, it locks and holds it, thus achieving the purpose of floating positioning surface. In this way, the processing will not be affected by the unevenness of the two end planes, and the pass rate is improved.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A precision boring jig for automotive connecting rods, comprising a base plate (8), characterized in that: The bottom plate (8) is fixedly connected to the top of the side plate (9), the side plate (9) is fixedly connected to the top of the support plate (10), and the side plate (9) is fixedly connected to the top of the top plate (11). A motor (12) is fixedly connected to the top of the base plate (8). A threaded rod (13) is fixedly connected to the output end of the motor (12). A threaded cylinder (14) is threadedly connected to the outer wall of the threaded rod (13). A support platform (15) is fixedly connected to the top of the threaded cylinder (14). A slide cylinder (16) is fixedly connected to the bottom of the support platform (15). A slide rod (17) is fixedly connected to the top of the top plate (11). A telescopic rod (18) is fixedly connected to the top of the telescopic rod (18). A movable block (19) is rotatably connected to the top of the telescopic rod (18). A movable plate (20) is rotatably connected to the outer wall of the movable block (19). A large end pressure plate (7) is fixedly connected to one side of the movable plate (20), a small end positioning pin (2) is fixedly connected to the top of the support platform (15), a telescopic rod (21) is fixedly connected to the top of the top plate (11), a floating support (3) is provided inside the support plate (10), a large end pad (5) is fixedly connected to the top of the top plate (11), a workpiece (1) is provided on the top of the large end pad (5), a small end pressure plate (4) is rotatably connected to the top of the telescopic rod (21), a movable plate (22) is fixedly connected to the top of the telescopic rod (21), and a large end positioning pin (6) is provided inside the large end pad (5).

2. The precision boring fixture for automotive connecting rods according to claim 1, characterized in that: The small end pressure plate (4) is rotatably connected to the inner side of the movable plate two (22).

3. The precision boring fixture for automotive connecting rods according to claim 1, characterized in that: The workpiece (1) is located at the bottom of the large end pressure plate (7), the workpiece (1) is movably connected to the outer wall of the large end positioning pin (6), and the workpiece (1) is located at the top of the floating support (3).

4. The precision boring fixture for automotive connecting rods according to claim 1, characterized in that: The movable plate (20) is located on top of the telescopic rod (18).

5. The precision boring fixture for automotive connecting rods according to claim 1, characterized in that: The support plate (10) has a circular hole inside, and the threaded cylinder (14) passes through the circular hole and moves.

6. The precision boring fixture for automotive connecting rods according to claim 1, characterized in that: The outer wall shape of the slide rod (17) matches the inner wall shape of the slide cylinder (16), and the slide cylinder (16) is slidably connected to the outer wall of the slide rod (17).

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