Automatic centering and pressing device for eccentric hole in end face of rocker arm shaft

Abstract

The utility model discloses a rockshaft end face eccentric hole automatic aligning and pressing device which comprises a floor, an automatic aligning device body, a machined part and an unmachined part, three sets of clamps are arranged at the top of the floor, an L-shaped end face positioning block is arranged on one side of the top of the floor, and the middle of the top of each clamp is in threaded connection with a hexagon socket screw A; according to the utility model, the L-shaped end face positioning block, the clamp, the pressing plate, the inside hexagonal bolt A, the cylindrical bolt, the mandrel fixing stop block, the thrust spring, the automatic alignment device body, the diamond taper pin and the pressing plate spring are matched with one another, so that the device adopts the principle that two points determine a straight line and four pins automatically align a parallel horizontal plane; the automatic alignment accessory body and the automatic alignment device body adopt an elastic cylindrical taper pin and diamond taper pin structure and a left U-shaped groove and right U-shaped groove design, and the automatic alignment accessory can automatically align and position an oil hole and automatically eliminate shape and position errors of a shaft hole and assembly errors of a clamp.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing technology of automatic rocker arm shafts for methanol and natural gas new energy exhaust, specifically an automatic alignment and clamping device for the eccentric hole on the end face of the rocker arm shaft. Background Technology

[0002] In typical rocker arm shaft machining, there is usually a single through-hole in the center. This through-hole is symmetrical, eliminating the need to determine orientation during machining. The machining process allows for rapid clamping, resulting in a simple body structure. After clamping with a V-clamp, the surface is milled, drilled, and tapped. However, in the process of upgrading engine technology to improve fuel economy, the rocker arm shaft structure has been changed. The central oil hole has been replaced with an eccentric single-hole or multi-hole structure. Currently, the most common rocker arm shaft structure is the double eccentric oil hole structure on the end face. Taking the double eccentric oil hole structure on the end face as an example, the eccentric oil hole and the mounting bolt hole have orientation requirements during machining. An eccentric positioning block needs to be made according to the eccentric shaft of the part for alignment. The eccentric positioning block is aligned with the eccentric hole of the rocker arm shaft, and the eccentric positioning block is aligned using a dial indicator before clamping the part. Only one part can be clamped at a time, and the alignment process is relatively time-consuming.

[0003] General-purpose V-type fixtures can only position the workpiece at the end face, not axially. Traditional fixtures have directional rigid pin holes on the end face stops. If the position of the oil hole on the end face is off, the workpiece cannot be clamped. If forced clamping is attempted, the end face will not be flat due to the misalignment between the end face locating pin and the shaft hole. Manually reducing the size of the end face locating pin hole will cause the positional tolerance of the machined workpiece to exceed the tolerance. For workpieces with misaligned oil holes, manual alignment is required, and only one workpiece can be machined at a time. Utility Model Content

[0004] The purpose of this invention is to provide an automatic alignment and clamping device for the eccentric hole on the end face of the rocker arm shaft, so as to solve the existing problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an automatic alignment and clamping device for the eccentric hole on the end face of a rocker arm shaft, comprising a base plate, an automatic alignment device body, a machined part, and an unmachined part. The top of the base plate is provided with three sets of clamps, and one side of the top of the base plate is provided with an L-end face positioning block. The middle of the top of the clamps is threaded with an internal hexagonal bolt A, and a pressure plate is sleeved on the top of the outer side of the internal hexagonal bolt A. A pressure plate spring connected to the pressure plate is sleeved on the outer side of the internal hexagonal bolt A.

[0006] The inner side of the automatic alignment device body is fitted with two sets of mandrel fixing blocks. One side of the automatic alignment device body is provided with an internal hexagon bolt B that is threadedly engaged with the mandrel fixing block. The inner side of the mandrel fixing block is fitted with a set of cylindrical pins and a set of diamond-shaped taper pins. A thrust spring is provided on one side of the cylindrical pins and diamond-shaped taper pins.

[0007] Preferred,The three sets of clamps are provided with locating pins A at both ends of the top, and six sets of internal hex bolts C that mate with the floor threads are provided at the edge of the top of the clamps. The locating pins A are used to position the clamps, and the internal hex bolts C are used to thread the clamps.

[0008] Preferably, two sets of positioning pins B are provided on one side of the top of the L end face positioning block, and hexagon socket head cap screws D are provided at the four corners of the top of the L end face positioning block for threaded connection with the floor. The positioning pins B are used to position the L end face positioning block, and the hexagon socket head cap screws D are used to thread-fix the L end face positioning block.

[0009] Preferably, the body of the automatic alignment device is U-shaped, and a set of mandrel fixing blocks slides in cooperation with the body of the automatic alignment device to facilitate the orientation of the workpiece.

[0010] Preferably, the installation height of the three sets of fixtures is consistent with the plane, which can ensure that the parts automatically align with the horizontal plane.

[0011] Preferably, the top of the fixture has V-shaped grooves at both ends to facilitate the positioning of the parts.

[0012] Compared with the prior art, the beneficial effects of this utility model are: the automatic alignment and clamping device for the eccentric hole on the end face of the rocker arm shaft;

[0013] Through the cooperation of the L-end face positioning block, fixture, pressure plate, internal hex bolt A, cylindrical pin, mandrel fixing block, thrust spring, automatic alignment device body, diamond tapered pin and pressure plate spring, the device adopts the principle of two points determining a straight line and four pins automatically aligning to the horizontal plane. Through the orientation of four pins, the part body is automatically aligned. The automatic alignment device body adopts the structure of elastic cylindrical tapered pin and diamond tapered pin, and the left and right U-shaped groove design. The automatic alignment auxiliary can automatically align, automatically position the oil hole, and automatically eliminate the form and position errors of the shaft hole and fixture. Attached Figure Description

[0014] Figure 1 This is a perspective view of the present utility model;

[0015] Figure 2 This is a front sectional view of the present invention;

[0016] Figure 3 This is a top view of the present invention;

[0017] Figure 4 This is a side sectional view of the clamp of this utility model;

[0018] Figure 5 This is a side sectional view of the L-end face positioning block of this utility model;

[0019] Figure 6This is a top sectional view of the main body of the automatic alignment device of this utility model;

[0020] Figure 7 This is a side view of the main body of the automatic alignment device of this utility model.

[0021] In the diagram: 1. Floor; 2. L-end positioning block; 3. Fixture; 4. Pressure plate; 5. Socket headstock bolt A; 6. Cylindrical pin; 7. Mandrel fixing block; 8. Thrust spring; 9. Automatic alignment device body; 10. Socket headstock bolt B; 11. Diamond tapered pin; 12. Socket headstock bolt C; 13. Positioning pin A; 14. Socket headstock bolt D; 15. Positioning pin B; 16. Machined part; 17. Pressure plate spring; 18. Unmachined part. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1-7 The embodiment provided by this utility model: an automatic alignment and clamping device for the eccentric hole on the end face of the rocker arm shaft, including a base plate 1, an automatic alignment device body 9, a machined part 16 and an unmachined part 18. Three sets of clamps 3 are provided on the top of the base plate 1. An L-end face positioning block 2 is provided on one side of the top of the base plate 1. An internal hexagon bolt A5 is threaded to the middle of the top of the clamp 3. A pressure plate 4 is sleeved on the top of the outer side of the internal hexagon bolt A5. A pressure plate spring 17 connected to the pressure plate 4 is sleeved on the outer side of the internal hexagon bolt A5.

[0024] The inner side of the automatic alignment device body 9 is fitted with two sets of spindle fixing blocks 7. One side of the automatic alignment device body 9 is provided with an internal hex bolt B10 that is threadedly engaged with the spindle fixing block 7. The inner side of the spindle fixing block 7 is fitted with a set of cylindrical pins 6 and a set of rhomboid tapered pins 11. A thrust spring 8 is provided on one side of the cylindrical pins 6 and rhomboid tapered pins 11.

[0025] Furthermore, the top ends of the three sets of clamps 3 are provided with locating pins A13, and the edge of the top of the clamps 3 is provided with six sets of internal hex bolts C12 that are threaded with the floor 1. The locating pins A13 are used to position the clamps 3, and the internal hex bolts C12 are used to thread the clamps 3.

[0026] Furthermore, two sets of positioning pins B15 are provided on one side of the top of the L-end face positioning block 2, and hexagon socket head cap screws D14 are provided at the four corners of the top of the L-end face positioning block 2 to be threadedly connected to the floor 1. The positioning pins B15 are used to position the L-end face positioning block 2, and the hexagon socket head cap screws D14 are used to thread-fix the L-end face positioning block 2.

[0027] Furthermore, the body 9 of the automatic alignment device is U-shaped, and a set of mandrel fixing blocks 7 are slidably engaged with the body 9 of the automatic alignment device. By loosening the hexagonal socket bolts B10, a set of mandrel fixing blocks 7 can slide along the inner side of the body 9 of the automatic alignment device, so that one set of the two sets of mandrel fixing blocks 7 is a fixed pin end and the other set is a movable pin end, which facilitates the orientation of the workpiece.

[0028] Furthermore, the installation height of the three sets of fixtures 3 is consistent with the plane, which can ensure that the parts automatically align with the horizontal plane.

[0029] Furthermore, V-shaped grooves are provided at both ends of the top of the fixture 3 to facilitate the positioning of the parts.

[0030] Working principle: This device is used to align and tighten the eccentric hole on the end face of the rocker arm shaft;

[0031] 1. Place the part on the fixture 3 and rotate it freely 360° without jamming. The pressure plate spring 17 automatically pushes the pressure plate 4 upward to prevent the pressure plate from falling downward due to gravity when loading and unloading parts, which would affect the efficiency of disassembling and assembling parts.

[0032] 2. Use the automatic alignment device body 9 to initially align the eccentric shaft hole of the part. The eccentric auxiliary fixture has an error prevention function. If the positioning pin hole cannot be aligned when clamping the part, it means that the part is installed in the wrong direction. Re-clamp the part correctly.

[0033] 3. Align the shaft hole of one part in fixture 3 with the mandrel fixing block 7 of the fixed pin, place it horizontally, rotate the other part so that the eccentric shaft hole of the other part is aligned with the mandrel fixing block 7 at the end of the movable pin, and push the whole part toward the L end face positioning block 2 so that the end face of the part is flat against the L end face positioning block 2.

[0034] 4. Shake the automatic alignment device body 9 left and right to observe the part body and the fixture 3 and then pre-tighten the internal hex bolt A5.

[0035] 5. Finally, use a torque wrench to tighten the right bolt, left bolt, and middle bolt in sequence, and then repeat the tightening once more. Manually remove the automatic alignment device body 9.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. An automatic alignment and clamping device for the eccentric hole on the end face of a rocker arm shaft, comprising a base plate (1), an automatic alignment device body (9), a machined part (16), and an unmachined part (18), characterized in that: The top of the floor (1) is provided with three sets of clamps (3), and one side of the top of the floor (1) is provided with an L-end face positioning block (2). The middle of the top of the clamp (3) is threaded with an internal hexagon bolt A (5). The top of the external side of the internal hexagon bolt A (5) is fitted with a pressure plate (4). The external side of the internal hexagon bolt A (5) is fitted with a pressure plate spring (17) connected to the pressure plate (4). The inner side of the automatic alignment device body (9) is fitted with two sets of mandrel fixing blocks (7). One side of the automatic alignment device body (9) is provided with an internal hexagon bolt B (10) that is threadedly engaged with the mandrel fixing block (7). The inner side of the mandrel fixing block (7) is fitted with a set of cylindrical pins (6) and a set of diamond-shaped taper pins (11). One side of the cylindrical pins (6) and diamond-shaped taper pins (11) is provided with a thrust spring (8).

2. The automatic alignment and clamping device for the eccentric hole on the end face of the rocker arm shaft according to claim 1, characterized in that: The three sets of clamps (3) are provided with positioning pins A (13) at both ends of the top, and six sets of internal hexagon bolts C (12) that are threaded into the floor (1) are provided at the edge of the top of the clamps (3).

3. The automatic alignment and clamping device for the eccentric hole on the end face of the rocker arm shaft according to claim 1, characterized in that: Two sets of positioning pins B (15) are provided on one side of the top of the L end face positioning block (2), and hexagonal bolts D (14) that are threaded to the floor (1) are provided at the four corners of the top of the L end face positioning block (2).

4. The automatic alignment and clamping device for the eccentric hole on the end face of the rocker arm shaft according to claim 1, characterized in that: The body (9) of the automatic alignment device is U-shaped, and a set of the spindle fixing blocks (7) slides in cooperation with the body (9) of the automatic alignment device.

5. The automatic alignment and clamping device for the eccentric hole on the end face of the rocker arm shaft according to claim 1, characterized in that: The installation height of the three sets of clamps (3) is consistent with the plane.

6. The automatic alignment and clamping device for the eccentric hole on the end face of the rocker arm shaft according to claim 1, characterized in that: The clamp (3) has V-shaped grooves at both ends of its top.

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