Tool clamp of engine cover

Abstract

The utility model relates to an engine cover work fixture which comprises a base plate, three supporting tables are fixedly installed on the base plate and distributed on the base plate in a triangular mode, and a positioning table is arranged outside a triangular area formed by the three supporting tables. The positioning table is fixedly mounted on the base plate; a first positioning hole is formed in the positioning table, a second positioning hole is formed in one supporting table, the distance between the first positioning hole and the second positioning hole is larger than the distance between the other two supporting tables and the first positioning hole, and a pressing component is arranged on one side of each supporting table. The top surfaces of the three supporting tables are triangularly combined to form a supporting surface; the engine cover is positioned through the first positioning hole and the second positioning hole, and meanwhile, the distance between the two positioning holes is larger than the length of the supporting face, so that the positioning precision and stability of parts are improved. The position constraint of the positioning hole ensures the clamping precision.

Description

Technical Field

[0001] The utility model relates to the technical field of machining equipment, in particular to a tooling fixture for an engine cover. Background Art

[0002] Existing engine covers are all machined using four-axis or multi-axis machining centers, which ensures dimensional accuracy. However, various factors affect dimensional accuracy, including positioning error, clamping error, tool setting error, machine tool accuracy, tool accuracy, process system elastic deformation, thermal deformation, and residual stress. These factors, alone or in combination, can lead to a decrease in machining accuracy. Therefore, appropriate measures must be taken during the machining process to reduce their impact and thus improve machining accuracy.

[0003] In actual machining, clamping error is the most common factor affecting workpiece accuracy. However, existing fixtures are often haphazard in their placement of support surfaces and positioning holes. While this allows for workpiece clamping, the consistency and accuracy of the workpiece's dimensions after machining need to be improved. This is particularly true when a workpiece requires simultaneous flatness, concentricity, and perpendicularity. Utility Model Content

[0004] The purpose of the utility model is to provide a tooling fixture for an engine cover, in order to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a tooling fixture for an engine cover, comprising a base plate, on which three support platforms are fixedly mounted, the three support platforms being distributed in a triangular shape on the base plate, and a positioning platform being arranged outside the triangular area formed by the three support platforms; the positioning platform being fixedly mounted on the base plate; a first positioning hole being arranged on the positioning platform, a second positioning hole being arranged on one of the support platforms, the distance between the first positioning hole and the second positioning hole being greater than the distance between the other two support platforms and the first positioning hole respectively, and a pressing component being arranged on one side of each support platform.

[0006] Compared to existing technologies, the top surfaces of the three support platforms form a triangular support surface. When the engine cover is placed on the three support platforms, the flatness of the surface to be machined is ensured by the machining center. The engine cover is positioned using the first and second positioning holes, ensuring concentricity after machining the holes to be machined. This also ensures perpendicularity between the holes and the surface on the engine cover. Furthermore, the distance between the two positioning holes is greater than the length of the support surface, which helps improve the positioning accuracy and stability of the part. The positioning hole position constraints ensure clamping accuracy.

[0007] The preferred technical solution of the utility model is that the pressing component includes a cylinder installed on a base plate, the output end of the cylinder is vertically upward and rotatably installed with a pressure plate, a T-shaped support seat is provided on one side of the output end, two connecting plates are provided between the support seat and the pressure plate, one end of the two connecting plates is rotatably connected to the support seat, and the other end is rotatably connected to the middle part of the pressure plate, and the front end of the pressure plate extends toward the support platform.

[0008] According to the preferred technical solution of the present invention, a mounting hole is horizontally provided on the top of the support seat, a lower connecting shaft is provided in the mounting hole, and both ends of the lower connecting shaft extend outside the support seat; two connecting plates are respectively connected to the two ends of the lower connecting shaft and are respectively located on both sides of the support seat.

[0009] According to the preferred technical solution of the present invention, a connecting hole is provided in the middle of the pressing plate, an upper connecting shaft is provided in the connecting hole, and two connecting plates are respectively connected to both ends of the upper connecting shaft and are respectively located on both sides of the pressing plate.

[0010] According to the preferred technical solution of the present invention, a flat square is provided at the end of the output shaft, a notch adapted to the flat square is provided on the pressure plate, a rotating hole is provided on the flat square and the pressure plate, and a rotating shaft is provided in the rotating hole.

[0011] According to the preferred technical solution of the present invention, both ends of the upper connecting shaft, the lower connecting shaft and the rotating shaft are provided with retaining springs, and the retaining springs on the upper connecting shaft and the lower connecting shaft abut against the outer side surface of the connecting plate; the retaining spring of the rotating shaft abuts against the pressure plate.

[0012] According to the preferred technical solution of the present invention, a recessed mounting groove is further provided on the base plate, and the cylinder is fixedly installed in the mounting groove.

[0013] In addition to the technical problems solved by the present invention, the technical features that constitute the technical solutions, and the advantages brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the present invention, other technical features included in the technical solutions, and the advantages brought about by these technical features will be further described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic diagram of the utility model engine cover clamped on the fixture.

[0015] Figure 2 It is a three-dimensional schematic diagram of the utility model.

[0016] Figure 3 It is a three-dimensional schematic diagram of the pressing component of the present utility model.

[0017] Explanation of the accompanying figures: 01, base plate; 02, support platform; 03, positioning platform; 04, first positioning hole; 05, second positioning hole; 06, cylinder; 07, support seat; 08, pressure plate; 09, lower connecting shaft; 10, connecting plate; 11, upper connecting shaft; 12, flat square; 13, notch; 14, rotating shaft; 15, retaining ring; 16, mounting groove. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] See also Figure 1-3 As shown, the tooling fixture for the engine hood of the present invention is used to clamp the engine hood of a motorcycle and place it on a four-axis machining center to process the engine hood. It includes a base plate 01 fixedly mounted on the machine platform of the machining center. The base plate 01 is fixed to the machine platform of the machining center using fasteners. Three support platforms 02 are fixedly mounted on the base plate 01. The three support platforms 02 are distributed in a triangular shape on the base plate 01. A positioning platform 03 is provided outside the triangular area formed by the three support platforms 02. The positioning platform 03 is fixed to the base plate 01 by fasteners. A first positioning hole 04 is provided on the positioning platform 03, and a second positioning hole 05 is provided on one of the support platforms 02. The first positioning hole 04 and the second positioning hole 05 are adapted to the screw connecting column on the engine hood. The distance between the first positioning hole 04 and the second positioning hole 05 is greater than the distance between the other two support platforms 02 and the first positioning hole 04. The top surfaces of the three support platforms 02 are combined to form a supporting surface. After the engine cover is placed on the three support platforms 02, the machining center ensures the flatness of the surface to be machined. The engine cover is positioned using the first positioning hole 04 and the second positioning hole 05 to ensure that the machining center maintains concentricity after machining the holes to be machined. This also ensures the perpendicularity of the holes and surfaces on the engine cover.

[0020] See also Figure 3As shown, one side of each support platform 02 is provided with a pressing component for pressing the engine cover. The pressing component includes a cylinder 06 mounted on the base plate 01, and the cylinder 06 and the base plate 01 are fixedly connected by fasteners. The output end of the cylinder 06 is vertically upward, and a T-shaped support seat 07 is provided on one side of the output end. The top of the output end is rotatably connected to a pressure plate 08. Using the threaded holes provided by the cylinder 06, the two ends of the support seat 07 are threadedly connected to the threaded holes provided by the cylinder 06 through fasteners, so that the support seat 07 is fixedly mounted on the cylinder 06. A mounting hole is provided horizontally at the top of the support seat 07, and a lower connecting shaft 09 is provided in the mounting hole. The two ends of the lower connecting shaft 09 extend outside the support seat 07. A connecting plate 10 is provided at each end of the lower connecting shaft 09. The two connecting plates 10 are located on both sides of the support seat 07 and rotate around the lower connecting shaft 09. The ends of the connecting plates 10 are provided with upper connecting shafts 11, and the middle portion of the pressure plate 08 is provided with a connection hole adapted to the upper connecting shaft 11. The pressure plate 08 is positioned between the two connecting plates 10. This allows the two connecting plates 10 to be rotationally connected to the pressure plate 08. Because the ends of the pressure plate 08 are rotationally connected to the ends of the output shafts, the two connecting plates 10 are rotationally connected to the middle portion of the pressure plate 08, and the front end of the pressure plate 08 extends toward the support platform 02.

[0021] Since two connecting plates 10 are provided between the pressure plate 08 and the support base 07, and one end of the two connecting plates 10 is rotatably connected to the support base 07 and the other end is rotatably connected to the middle of the pressure plate 08, when the output shaft of the cylinder 06 is retracted, the pressure plate 08 rotates around the upper connecting shaft 11, causing the front end of the pressure plate 08 to move away from the support base 07, while the end of the pressure plate 08 connected to the output shaft moves toward the cylinder 06. This puts the pressure plate 08 in an open state, making it easier for the operator to take the engine cover.

[0022] On the contrary, when the output shaft of the cylinder 06 is extended, the pressing plate 08 rotates around the upper connecting shaft 11, causing the front end of the pressing plate 08 to move toward the support seat 07, while the end of the pressing plate 08 connected to the output shaft moves away from the cylinder 06. As a result, the front end of the pressing plate 08 abuts against the engine cover, closing the cover and facilitating the fixing of the engine cover to the support platform 02.

[0023] The output shaft is provided with a flat square 12 at its end, and a notch 13 is provided on the pressure plate 08 to accommodate the flat square 12. Rotation holes are provided on the flat square 12 and the pressure plate 08, and a rotating shaft 14 is installed in the rotation hole. The rotating shaft 14 connects the output shaft and the pressure plate 08, thus ensuring a rotational connection between the pressure plate 08 and the output shaft. The design of the flat square 12 and notch 13 also ensures that the pressure plate 08 maintains a consistent direction during rotation.

[0024] The upper connecting shaft 11, the lower connecting shaft 09 and the rotating shaft 14 are provided with a retaining spring 15 at both ends. The retaining springs 15 on the upper connecting shaft 11 and the lower connecting shaft 09 abut against the outer side surface of the connecting plate 10. The retaining spring 15 of the rotating shaft 14 abuts against the pressing plate 08.

[0025] Base plate 01 also features a recessed mounting groove 16. The bottom of base plate 01 is provided with a through-hole that connects to mounting groove 16. When cylinder 06 is placed within mounting groove 16, fasteners are threaded through the bottom of base plate 01 and into the threaded holes provided by cylinder 06. This secures cylinder 06 within mounting groove 16. Since a portion of cylinder 06 is located within mounting groove 16, it is effectively located within base plate 01, thereby lowering the height of base plate 01 and cylinder 06, and thus the height of support platform 02. This reduced height of support platform 02 lowers the overall center of gravity when the engine cover is clamped, preventing vibration during machining, improving machining stability, and avoiding the appearance of chatter marks.

[0026] When the present invention is in use, the output end of the cylinder 06 in the pressing component is retracted, causing the pressing plate 08 to rotate around the upper connecting shaft 11, causing the front end of the pressing plate 08 to move away from the support seat 07. At the same time, the end of the pressing plate 08 connected to the output shaft moves toward the cylinder 06. This puts the pressing plate 08 in an open state. The operator places the engine cover on the support platform 02 and the positioning platform 03. Then, the output shaft of the cylinder 06 is extended, and the pressing plate 08 rotates around the upper connecting shaft 11, causing the front end of the pressing plate 08 to move toward the support seat 07. At the same time, the end of the pressing plate 08 connected to the output shaft moves away from the cylinder 06. This puts the front end of the pressing plate 08 into contact with the engine cover, putting the cover in a closed state, making it easier to fix the engine cover on the support platform 02.

[0027] It should be noted that for the sake of clarity, the fasteners described in this application are any one of screws, bolts, and screws, and the "circlips" installed in different positions are marked with the same figure number "15".

[0028] If the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] The above embodiments are merely descriptions of preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A fixture for an engine cover, comprising a base plate, characterized in that: Three support platforms are fixedly installed on the substrate, and the three support platforms are distributed in a triangle on the substrate. A positioning platform is arranged outside the triangular area formed by the three support platforms; the positioning platform is fixedly installed on the substrate; a first positioning hole is arranged on the positioning platform, and a second positioning hole is arranged on one of the support platforms. The distance between the first positioning hole and the second positioning hole is greater than the distance between the other two support platforms and the first positioning hole respectively, and a pressing component is arranged on one side of each support platform.

2. The engine cover fixture according to claim 1, characterized in that: The pressing component includes a cylinder installed on a base plate, and the output end of the cylinder is vertically upward and rotatably installed with a pressure plate. A T-shaped support seat is provided on one side of the output end, and two connecting plates are provided between the support seat and the pressure plate. One end of the two connecting plates is rotatably connected to the support seat, and the other end is rotatably connected to the middle part of the pressure plate. The front end of the pressure plate extends toward the support platform.

3. The engine cover fixture according to claim 2, characterized in that: A mounting hole is horizontally provided on the top of the support seat, and a lower connecting shaft is provided in the mounting hole, with both ends of the lower connecting shaft extending outside the support seat; two connecting plates are respectively connected to the two ends of the lower connecting shaft and are respectively located on both sides of the support seat.

4. The engine cover fixture according to claim 3, characterized in that: A connecting hole is provided in the middle of the pressing plate, an upper connecting shaft is provided in the connecting hole, and two connecting plates are respectively connected to both ends of the upper connecting shaft and are respectively located on both sides of the pressing plate.

5. The engine cover fixture according to claim 4, characterized in that: The end of the output shaft is provided with a flat square, the pressing plate is provided with a notch adapted to the flat square, the flat square and the pressing plate are provided with rotating holes, and the rotating shaft is provided in the rotating hole.

6. The engine cover fixture according to claim 5, characterized in that: Both ends of the upper connecting shaft, the lower connecting shaft and the rotating shaft are provided with a retaining spring. The retaining springs on the upper connecting shaft and the lower connecting shaft abut against the outer side surface of the connecting plate; the retaining spring of the rotating shaft abuts against the pressure plate.

7. The engine cover fixture according to claim 2, characterized in that: A recessed mounting groove is also provided on the base plate, and the cylinder is fixedly mounted in the mounting groove.

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