Valve guide assembly tool

Abstract

The utility model discloses an assembly tool for a valve guide, and relates to the technical field of valve guide assembly; it comprises a U-shaped fixing frame, a lifting plate is provided in the inner cavity of the fixing frame, a mounting tube is installed at the bottom of the lifting plate, the top of the lifting plate is fixedly connected with two guide rods that can movably penetrate the fixing frame, a driving mechanism for driving the lifting plate to be lifted and lowered is provided on the fixing frame, a limiting mechanism for limiting the cylinder head is provided on the fixing plate, the limiting mechanism comprises an adjusting screw and a limiting block, the top of the fixing plate is movably connected with two limiting blocks that are relatively arranged, and the side wall of the fixing frame is threadedly connected with the adjusting screw that is rotatably connected with the limiting block. The assembly tool for the valve guide can limit the cylinder head placed on the fixing plate, and then the mounting tube squeezes the valve guide to be installed on the cylinder head by lifting and lowering the lifting plate, so as to avoid the valve guide from being offset when being installed on the cylinder head, and ensure the stability of its installation.

Description

Technical Field

[0001] The utility model relates to the technical field of valve guide assembly, in particular to an assembly tool for a valve guide. Background Art

[0002] The valve guide is a guide device for the engine valve. It guides the valve and transfers the heat on the valve stem to the cylinder head through the valve guide. When assembling the engine, the valve guide is pressed into the guide bottom hole in the cylinder head by external force, and then the guide hole is fine-machined. Therefore, the press-fitting quality of the valve guide will directly affect the quality of subsequent fine machining. If the press-fitting is skewed, it will cause uneven machining of the guide hole wall thickness. During the operation of the engine, there will be abnormal contact between the valve and the guide hole, which will accelerate the wear of the guide hole and affect the performance parameters of the whole machine.

[0003] At present, the valve guide and cylinder head are usually installed by the press-in method, which uses an external force such as a press to directly press the guide into the seat hole of the cylinder head guide to ensure the installation effect. Most of the installation equipment for the cylinder head valve guide of this type of engine on the market currently does not have a limiting mechanism. When the valve guide is pressed into the cylinder head, it is easy to deviate, thereby affecting its installation effect. Utility Model Content

[0004] The utility model provides an assembly tool for a valve guide tube to solve the problems in the background technology.

[0005] The camshaft is an axially traversable device for activating the lift and disengaging the camshafts, and the camshafts are adapted to move the camshafts downwards and downwards to move the camshafts upwards and downwards to move the camshafts upwards.

[0006] Furthermore, the driving mechanism includes a fixed box, a fixed cylinder, and a lifting screw. The fixed box is fixedly connected to the top center of the fixed frame, and a fixed cylinder connected to its inner cavity is installed on the top of the fixed box. The inner cavity of the fixed cylinder is movably provided with a lifting screw that can penetrate the fixed box and the fixed frame. The bottom end of the lifting screw is fixedly connected to a lifting plate, and a worm gear mechanism is provided in the fixed box to drive the lifting screw to lift and lower.

[0007] Furthermore, the worm gear mechanism includes a limit bearing, a worm wheel and a worm, and two upper and lower limit bearings are installed in the fixed box. The fixed box is located between the two limit bearings and is rotatably connected to the worm wheel with a built-in nut. The lifting screw passes through the limit bearing and is threadedly connected to the nut. The fixed box is rotatably connected to the worm gear that meshes with the worm wheel.

[0008] Furthermore, a motor for driving the worm to rotate is installed on the fixed box.

[0009] Furthermore, the bottom ends of both sides of the fixing frame are fixedly connected with mounting ear plates, and the tops of the mounting ear plates are fixedly connected with reinforcing blocks connected to the fixing frame.

[0010] Furthermore, a spring sleeved on the guide rod is provided between the lifting plate and the bottom inner wall of the fixing frame.

[0011] Compared with the prior art, the utility model provides a valve guide assembly tool having the following beneficial effects: the valve guide assembly tool can limit the cylinder head placed on the fixing plate by adjusting the cooperation of the screw and the limit block, and then the installation tube can be squeezed by the lifting and lowering of the lifting plate to install the valve guide on the cylinder head, thereby avoiding the displacement of the valve guide when it is installed on the cylinder head and ensuring the stability of its installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 This is a schematic diagram of the internal structure of the fixed box of the utility model;

[0014] Figure 3 It is an enlarged schematic diagram of point A of the present utility model.

[0015] In the figure: 1. fixing frame; 2. fixing box; 3. fixing cylinder; 4. lifting screw; 5. lifting plate; 6. mounting cylinder; 7. fixing plate; 8. limiting bearing; 9. worm gear; 10. worm; 11. motor; 12. guide rod; 13. spring; 14. adjusting screw; 15. limiting block; 16. mounting ear plate; 17. reinforcing block. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] See also Figure 1-3 The utility model discloses an assembly tool for a valve guide, comprising a U-shaped fixing frame 1, wherein the inner cavity of the fixing frame 1 is liftable and provided with a lifting plate 5, and a fixing plate 7 is fixedly connected between the inner walls on both sides of the fixing frame 1 and located below the lifting plate 5, and a mounting tube 6 is installed at the bottom of the lifting plate 5, and the mounting tube 6 is used for pressing the valve guide into, and the top of the lifting plate 5 is fixedly connected with two guide rods 12 that can movably penetrate the fixing frame 1, and the fixing frame 1 is provided with a driving mechanism for driving the lifting plate 5 to be lifted and lowered, and the fixing plate 7 is provided with a limiting mechanism for limiting the cylinder head, and the limiting mechanism comprises an adjusting screw 14 and a limiting block 15, and the top of the fixing plate 7 is movably connected with two relatively arranged limiting blocks 15, and the outer wall of the fixing frame 1 is threadedly connected with an adjusting screw 14, and the end of the adjusting screw 14 penetrates the side wall of the fixing frame 1, and the end of the adjusting screw 14 that penetrates the side wall of the fixing frame 1 is rotatably connected with the limiting block 15.

[0018] A spring 13 sleeved on the guide rod 12 is provided between the lifting plate 5 and the bottom inner wall of the fixing frame 1 .

[0019] Specifically, the driving mechanism includes a fixed box 2, a fixed cylinder 3, and a lifting screw 4. The fixed box 2 is fixedly connected to the top center of the fixed frame 1. The fixed cylinder 3 connected to its inner cavity is installed on the top of the fixed box 2. The inner cavity of the fixed cylinder 3 is movably provided with a lifting screw 4 that can penetrate the fixed box 2 and the fixed frame 1. The bottom end of the lifting screw 4 is fixedly connected to a lifting plate 5. A worm gear mechanism is provided in the fixed box 2 to drive the lifting screw 4 to lift and lower.

[0020] The worm gear mechanism includes a limit bearing 8, a worm wheel 9 and a worm 10. Two upper and lower limit bearings 8 are installed in the fixed box 2. The fixed box 2 is located between the two limit bearings 8 and is rotatably connected to the worm wheel 9 with a built-in nut. The lifting screw 4 passes through the limit bearing 8 and is threadedly connected to the nut. The fixed box 2 is rotatably connected to the worm 10 that meshes with the worm wheel 9.

[0021] The fixed box 2 is provided with a motor 11 for driving the worm 10 to rotate.

[0022] In this embodiment, the motor 11 drives the worm 10 to engage the worm wheel 9, so that the nut inside the worm wheel 9 rotates. Since the worm wheel 9 and the nut are restricted by the limit bearing 8 for displacement, the nut inside the worm wheel 9 drives the lifting screw 4 to lift and lower. When the lifting screw 4 descends, it can drive the lifting plate 5 to move downward, so that the installation cylinder 6 can press the valve guide.

[0023] Specifically, mounting ear plates 16 are fixedly connected to the bottom ends of both sides of the fixing frame 1 .

[0024] In this embodiment, a mounting hole is provided on the mounting ear plate 16 , and the mounting ear plate 16 can be installed at a corresponding position by means of bolts, so as to install the fixing frame 1 .

[0025] Specifically, the top of the mounting ear plate 16 is fixedly connected to a reinforcing block 17 connected to the fixing frame 1 .

[0026] In this embodiment, the provision of the reinforcing block 17 can improve the connection stability between the mounting ear plate 16 and the fixing frame 1 .

[0027] In summary, the valve guide assembly tool can limit the cylinder head placed on the fixing plate 7 by adjusting the cooperation between the screw 14 and the limit block 15, and then the installation tube 6 can be squeezed by the lifting and lowering of the lifting plate 5 to install the valve guide on the cylinder head, thereby avoiding the displacement of the valve guide when installing it on the cylinder head and ensuring its installation stability.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A valve guide assembly tool, comprising a U-shaped fixing frame (1), characterized in that: The inner cavity of the fixing frame (1) is provided with a lifting plate (5) which can be raised and lowered. A fixing plate (7) is fixedly connected between the inner walls on both sides of the fixing frame (1) and located below the lifting plate (5). A mounting cylinder (6) is installed at the bottom of the lifting plate (5). The mounting cylinder (6) is used for pressing the valve guide. The top of the lifting plate (5) is fixedly connected with two guide rods (12) which can movably penetrate the fixing frame (1). The fixing frame (1) is provided with a driving mechanism for driving the lifting plate (5) to be raised and lowered. The fixing plate (7) is provided with a limiting mechanism for limiting the position of the cylinder head, the limiting mechanism comprising an adjusting screw (14) and a limiting block (15), the top of the fixing plate (7) is movably connected to two limiting blocks (15) arranged opposite to each other, the outer wall of the fixing frame (1) is threadedly connected with the adjusting screw (14), the end of the adjusting screw (14) passes through the side wall of the fixing frame (1), and the end of the adjusting screw (14) passing through the side wall of the fixing frame (1) is rotatably connected to the limiting block (15).

2. The valve guide assembly tool according to claim 1, characterized in that: The driving mechanism comprises a fixed box (2), a fixed cylinder (3), and a lifting screw (4); the top center of the fixed frame (1) is fixedly connected to the fixed box (2); the top of the fixed box (2) is provided with a fixed cylinder (3) connected to its inner cavity; the inner cavity of the fixed cylinder (3) is movably provided with a lifting screw (4) that can penetrate the fixed box (2) and the fixed frame (1); the bottom end of the lifting screw (4) is fixedly connected to a lifting plate (5); and a worm gear mechanism is provided in the fixed box (2) for driving the lifting screw (4) to lift and lower.

3. The valve guide assembly tool according to claim 2, characterized in that: The worm gear mechanism comprises a limit bearing (8), a worm wheel (9) and a worm (10); two limit bearings (8) arranged up and down are installed in the fixed box (2); the fixed box (2) is located between the two limit bearings (8) and is rotatably connected to the worm wheel (9) with a built-in nut; the lifting screw (4) passes through the limit bearing (8) and is threadedly connected to the nut; the fixed box (2) is rotatably connected to the worm wheel (9) that meshes with the worm wheel (9).

4. The valve guide assembly tool according to claim 3, characterized in that: The fixed box (2) is provided with a motor (11) for driving the worm (10) to rotate.

5. The valve guide assembly tool according to claim 1, characterized in that: The bottom ends of both sides of the fixing frame (1) are fixedly connected with mounting ear plates (16), and the tops of the mounting ear plates (16) are fixedly connected with reinforcing blocks (17) connected to the fixing frame (1).

6. The valve guide assembly tool according to claim 1, characterized in that: A spring (13) sleeved on the guide rod (12) is provided between the lifting plate (5) and the bottom inner wall of the fixing frame (1).

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