Fixture for engine timing cover cap machining

Abstract

The utility model discloses a clamp for engine timing cover cap machining, and belongs to the technical field of timing cover cap machining. A clamp used for engine timing cover cap machining comprises a clamp plate, at least two sets of floating pins used for positioning a timing cover cap are arranged on the clamp plate, the clamp further comprises three sets of supporting bases used for supporting the timing cover cap according to the set position, the three sets of supporting bases are all fixedly arranged on the clamp plate, and three sets of first oil cylinders are fixedly arranged on the clamp plate; the floating supporting cylinder is in threaded connection with the clamp plate, a second oil cylinder is fixedly arranged on the clamp plate, and the area of the clamping surface is smaller than that of the supporting surface; the three groups of supporting seats and the two groups of floating pins are fixedly arranged on the clamp plate, the timing cover can be supported and positioned in a mode that the two pins are arranged on one surface, and the floating supporting cylinders are additionally arranged on the clamp plate to support the timing cover, so that a workpiece can be effectively prevented from being deformed due to cutting force during machining, and the machining precision is improved. The planeness of the flange face can be guaranteed, and the product machining quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of timing cover machining technology, and in particular to a fixture for machining engine timing covers. Background Technology

[0002] The engine timing cover is an important component installed on the side of the engine and connected to the cylinder block. Its main function is to seal and protect the engine's timing system and reduce noise. During engine operation, the timing cover and the front face of the engine cylinder block form a sealed space, which seals the timing belt, pulley, tensioner and other components in the engine transmission, effectively preventing the timing system from being contaminated by oil, water, mud and other debris.

[0003] Timing covers are typically made of cast aluminum alloy and are thin-walled parts with a large machining area. When milling the timing cover mounting flange surface using a CNC machining center, existing fixtures, because the timing cover can be supported on a blank surface, usually employ three-point support and clamping to reduce workpiece deformation during clamping. However, due to the length of the timing cover, it is difficult to evenly arrange the three-point support and clamping, reducing the stability of the fixture and making it particularly prone to deformation during machining. This results in substandard flatness of the mounting flange surface, which may cause problems such as poor sealing and air leakage when installed on the engine. Utility Model Content

[0004] The purpose of this invention is to solve the problem that in the prior art, the timing cover is long and the stability of the three-point support fixture is low, which easily leads to the unqualified flatness of the flange surface. Therefore, this invention proposes a fixture for machining engine timing covers.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A fixture for machining an engine timing cover includes a fixture plate with at least two sets of floating pins for positioning the timing cover. It also includes three sets of support seats for supporting the timing cover at predetermined positions, all fixedly mounted on the fixture plate. Three sets of first hydraulic cylinders are fixedly mounted on the fixture plate, each corresponding to a support seat, with its clamping surface located on the support surface of the support seat. A floating support cylinder is threaded onto the fixture plate, each having a floating support head for supporting the timing cover. A second hydraulic cylinder is fixedly mounted on the fixture plate, with its clamping surface located on the support surface of the floating support head, and the area of ​​the clamping surface being smaller than the area of ​​the support surface.

[0007] To facilitate the floating pin's up-and-down movement, preferably, at least two sets of positioning pin seats are fixedly provided on the clamping plate. Each positioning pin seat has a limiting hole and a second positioning hole that communicates with the limiting hole. The outer wall of the floating pin matches the inner wall of the second positioning hole. A limiting plate is raised and lowered within the limiting hole. One end of the floating pin, which passes through the second positioning hole and extends into the limiting hole, is fixedly connected to the limiting plate. A first spring is provided within the limiting hole, with its two ends abutting against the bottom of the limiting plate and the top of the clamping plate, respectively.

[0008] To improve the positioning accuracy of the positioning pin seat, a first positioning hole is further provided on the fixture plate, and a positioning sleeve matching the first positioning hole is fixedly provided at the bottom of the positioning pin seat, and the positioning sleeve is slidably disposed in the first positioning hole.

[0009] To facilitate the installation of the fixture plate on the machine tool's worktable, preferably, a base is fixedly provided at the bottom of the fixture plate, and the base has multiple fixing holes.

[0010] Furthermore, all of the aforementioned fixing holes have a U-shaped structure.

[0011] Preferably, the fixture plate is provided with a plurality of guide rods for guiding the timing cover, the guide rods are provided with eccentric holes, the eccentric holes are provided with bolts, and the bolts are threadedly connected to the fixture plate.

[0012] Compared with the prior art, this utility model provides a fixture for machining engine timing covers, which has the following advantages:

[0013] 1. The fixture for machining engine timing covers uses three sets of support seats and two sets of floating pins fixed on the fixture plate. The timing cover can be supported and positioned by using two pins on one side. In addition, the floating support cylinder is added to the fixture plate to support the timing cover. The first and second hydraulic cylinders are used for clamping, which can effectively prevent the workpiece from deforming due to cutting force during machining, reduce the vibration of the workpiece during machining, ensure the flatness of the flange surface, and improve the product machining quality.

[0014] 2. The fixture for machining engine timing covers can guide the timing cover when it is placed on the fixture plate by installing guide rods. Furthermore, eccentric holes are opened on the guide rods to facilitate adjustment of the distance between the side wall of the guide rod and the timing cover, thereby improving the guiding effect.

[0015] The parts not covered in this device are the same as or can be implemented using existing technology. This utility model supports and positions the timing cover by fixing three sets of support seats and two sets of floating pins on the fixture plate. In addition, the addition of floating support cylinders on the fixture plate to support the timing cover can effectively prevent the workpiece from deforming due to cutting force during processing, reduce the vibration of the workpiece during processing, ensure the flatness of the flange surface, and improve the product processing quality. Attached Figure Description

[0016] Figure 1 This utility model presents a schematic diagram of the structure of a fixture for machining engine timing covers. Figure 1 ;

[0017] Figure 2 This utility model presents a schematic diagram of the structure of a fixture for machining engine timing covers. Figure 2 ;

[0018] Figure 3 This utility model presents a schematic diagram of the structure of a fixture for machining engine timing covers. Figure 3 ;

[0019] Figure 4 This is a cross-sectional view of a fixture positioning pin seat for machining engine timing cover according to the present invention.

[0020] In the diagram: 1. Fixture plate; 101. Base; 102. Fixing hole; 2. First hydraulic cylinder; 201. Pressure plate; 202. Second hydraulic cylinder; 3. Support seat; 4. Positioning pin seat; 401. Floating pin; 402. Positioning sleeve; 5. Floating support cylinder; 501. Extension rod; 6. Guide rod. 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 of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0023] Example:

[0024] Reference Figures 1-4A fixture for machining engine timing cover includes a fixture plate 1. At least two sets of floating pins 401 for positioning the timing cover are provided on the fixture plate 1. Preferably, two sets of floating pins 401 are used. The top of each floating pin 401 is frustum-shaped and extends into a blank hole on the timing cover. The inclined surface abuts against the bottom end face of the blank hole. Since the blank hole is unmachined, its diameter has a large error compared to a finished hole. Therefore, the frustum-shaped top of the floating pin 401 allows it to move up and down, adapting to changes in the inner diameter of the blank hole and satisfying the positioning requirements. The effect also includes: three sets of support seats 3 that support the timing cover in the set position are all fixedly set on the clamp plate 1. Here, we place two of the three sets of support seats 3 on both sides of the end of the timing cover structure that is more numerous and heavier, and the other set of support seats 3 is set on one side of the other end of the timing cover. Among them, three sets of first hydraulic cylinders 2 are fixedly set on the clamp plate 1. The first hydraulic cylinders 2 correspond to the support seats 3. The clamping surface of the first hydraulic cylinder 2 is located on the support surface of the support seat 3. That is to say, the clamping surface of the first hydraulic cylinder 2 is located directly above the support surface of the support seat 3.A floating support cylinder 5 is threadedly connected to the clamping plate 1. The floating support cylinder 5 has a floating support head for supporting the timing cover. An extension rod 501 is fixedly mounted on the floating support head, and the top of the extension rod 501 abuts against the timing cover. This eliminates the need for a height-increasing bracket to increase the height of the floating support cylinder 5. A second hydraulic cylinder 202 is fixedly mounted on the clamping plate 1. The clamping surface of the second hydraulic cylinder 202 is positioned on the support surface of the floating support head. Similarly, the clamping surface of the second hydraulic cylinder 202 is directly opposite the extension rod 501. Above the top support surface, and with the area of ​​the clamping surface of the first cylinder 2 being smaller than the area of ​​the support surface of the support base 3, and the area of ​​the clamping surface of the second cylinder 202 being smaller than the area of ​​the support surface of the extension rod 501, the clamping force is applied to the support base 3 and the extension rod 501, reducing deformation of the timing cover during clamping and improving the performance. Both the first cylinder 2 and the second cylinder 202 are equipped with Z-shaped pressure plates 201. The height of the top end face of the clamping end of the pressure plate 201 is lower than the height of the timing cover flange surface after machining. This means that the flange face can be directly milled using a face milling cutter, avoiding interference from the pressure plate 201 on the milling cutter, eliminating the need for the milling cutter to avoid obstacles, and improving processing efficiency. Both the first cylinder 2 and the second cylinder 202 are lever cylinders in the prior art. Since the clamping point of the second cylinder 202 is a floating support, its clamping force is less than that of the first cylinder 2 while meeting the clamping requirements. The preferred model for the first cylinder 2 is HLC-32, and the preferred model for the second cylinder 202 is HLC-25. The floating support cylinder 5 is also in the prior art, preferably HSW-36AL. The working process is as follows: when the copper sleeve inside the support cylinder is in its initial position, the support head is at its uppermost position under the action of the internal spring. During operation, the workpiece's gravity presses down on the support head, causing it to move downwards synchronously. When the workpiece is securely placed on the fixture, the downward movement stops, and the support head also stops moving. After lubrication, the support cylinder locks, providing support to the workpiece and stopping its movement, which can increase the support effect on the timing cover.

[0025] In use, three sets of support seats 3 and two sets of floating pins 401 are fixedly set on the fixture plate 1. The timing cover can be supported and positioned by the two pins on one side. In addition, a floating support cylinder 5 is added to the fixture plate 1 to support the timing cover. The first oil cylinder 2 and the second oil cylinder 202 are used for clamping. This can effectively prevent the workpiece from deforming due to cutting force during processing, reduce the vibration of the workpiece during processing, ensure the flatness of the flange surface, and improve the product processing quality.

[0026] Reference Figures 1-4At least two sets of positioning pin seats 4, preferably two sets, are fixedly installed on the fixture plate 1. A limiting hole is opened in the positioning pin seat 4, and a second positioning hole connected to the limiting hole is opened on the positioning pin seat 4. The outer wall of the floating pin 401 is matched with the inner wall of the second positioning hole, that is, to ensure the coaxiality between the floating pin 401 and the second positioning hole. A limiting plate is raised and lowered in the limiting hole. One end of the floating pin 401 that passes through the second positioning hole and extends into the limiting hole is fixedly connected to the limiting plate. A first spring is installed in the limiting hole. The two ends of the first spring abut against the bottom of the limiting plate and the top of the fixture plate 1, respectively. In use, it is convenient for the floating pin 401 to slide up and down. Moreover, under the elastic force of the first spring, the inclined surface on the round table of the floating pin 401 can always abut against the bottom of the blank hole, thereby improving the positioning effect.

[0027] Reference Figure 4 A first positioning hole is provided on the fixture plate 1. A positioning sleeve 402 matching the first positioning hole is fixedly provided at the bottom of the positioning pin seat 4. The positioning sleeve 402 is coaxial with the first positioning hole. The positioning sleeve 402 is slidably set in the first positioning hole. In use, by fixing the positioning sleeve 402 at the bottom of the positioning pin seat 4 and providing the first positioning hole on the fixture plate 1, the outer wall of the positioning sleeve 402 matches the inner wall of the first positioning hole, which can ensure the position of the positioning pin seat 4 and improve the positioning accuracy.

[0028] Reference Figures 1-3 A base 101 is fixedly installed at the bottom of the fixture plate 1, and a heightening plate is fixedly installed between the fixture plate 1 and the base 101 to increase the height of the fixture plate 1 and the timing cover. Multiple fixing holes 102 are provided on the base 101, with two to eight holes, preferably four, to facilitate fixing the fixture to the worktable inside the machine tool. The multiple fixing holes 102 are all U-shaped to facilitate adjusting the position of the fixing bolts and improve the performance.

[0029] Reference Figures 1-3 The fixture plate 1 is provided with a plurality of guide rods 6 for guiding the timing cover. There are two to eight guide rods 6, preferably six. Two are placed at each end of the timing cover, and two are installed in the direction of the machine tool door of the fixture plate 1. The guide rods 6 are provided with eccentric holes, and bolts are provided in the eccentric holes. The bolts are threaded to the fixture plate 1. That is, the bolts are threaded to the fixture plate 1 through the eccentric holes. In use, by installing the guide rods 6 on the fixture plate 1, the timing cover can be guided when it is placed on the fixture plate 1. Moreover, the eccentric holes on the guide rods 6 facilitate the adjustment of the distance between the side wall of the guide rod 6 and the timing cover, thereby improving the guiding effect.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A fixture for machining engine timing cover, comprising a fixture plate (1), characterized in that, The clamp plate (1) is provided with at least two sets of floating pins (401) for positioning the timing cover, and also includes: The three sets of support seats (3) that support the timing cover in the set position are all fixedly set on the clamp plate (1). Among them, three sets of first oil cylinders (2) are fixedly installed on the clamp plate (1). The first oil cylinder (2) corresponds to the support base (3), and the clamping surface of the first oil cylinder (2) is located on the support surface of the support base (3). A floating support cylinder (5) is threadedly connected to the clamp plate (1), the floating support cylinder (5) having a floating support head for supporting the timing cover. The clamping plate (1) is fixedly provided with a second oil cylinder (202), the clamping surface of the second oil cylinder (202) is located on the support surface of the floating support head, and the area of ​​the clamping surface is smaller than the area of ​​the support surface.

2. The fixture for machining engine timing covers according to claim 1, characterized in that, At least two sets of positioning pin seats (4) are fixedly provided on the clamp plate (1). The positioning pin seat (4) has a limit hole. The positioning pin seat (4) has a second positioning hole that communicates with the limit hole. The outer wall of the floating pin (401) matches the inner wall of the second positioning hole. A limit plate is raised and lowered in the limit hole. One end of the floating pin (401) that passes through the second positioning hole and extends into the limit hole is fixedly connected to the limit plate. A first spring is provided in the limit hole. The two ends of the first spring abut against the bottom of the limit plate and the top of the clamp plate (1), respectively.

3. A fixture for machining engine timing covers according to claim 2, characterized in that, The clamp plate (1) has a first positioning hole, and the bottom of the positioning pin seat (4) is fixedly provided with a positioning sleeve (402) that matches the first positioning hole. The positioning sleeve (402) is slidably disposed in the first positioning hole.

4. A fixture for machining engine timing covers according to claim 1, characterized in that, The bottom of the clamp plate (1) is fixedly provided with a base (101), and the base (101) has multiple fixing holes (102).

5. A fixture for machining engine timing covers according to claim 4, characterized in that, All of the aforementioned fixing holes (102) have a U-shaped structure.

6. A fixture for machining engine timing covers according to claim 1, characterized in that, The clamp plate (1) is provided with a plurality of guide rods (6) for guiding the timing cover. The guide rods (6) are provided with eccentric holes and bolts are provided in the eccentric holes. The bolts are threadedly connected to the clamp plate (1).

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