Steel ball press-fitting device for oil sprayer

Abstract

The utility model discloses a steel ball press-fitting device for a fuel injector, which comprises a pressure head base fixedly mounted on a press workbench; a clamp base is mounted on the upper surface of the pressure head base, an inclined supporting part is arranged on the clamp base, and a fuel injector body mounting hole is formed in the supporting part, so that a steel ball hole of a fuel injector body is always vertically upward; a positioning sleeve is vertically mounted on a cross beam at the upper part of the pressing head base, a pressing rod with a reducing structure is mounted in the positioning sleeve, a pressing ring is arranged on the upper end surface of the pressing rod, a spring guide rod is arranged in the center of the pressing ring, a spring is arranged on the spring guide rod, and the upper end of the spring is inserted into a central hole of the pressing head of the pressing machine; the pressing rod is inserted into the positioning sleeve, and a compression spring abutting against the step of an inner hole of the positioning sleeve is arranged on the pressing rod in the positioning sleeve in a sleeved mode. According to the steel ball press-fitting device for the oil sprayer, due to the unique design and the optimized structure, high-precision, automatic and high-efficiency steel ball press-fitting is achieved, and the manufacturing quality and the production efficiency of the oil sprayer are remarkably improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of production and assembly of fuel injectors, and in particular relates to a steel ball press-fitting device for fuel injectors. Background Art

[0002] In the field of fuel injector manufacturing, the assembly of the steel ball and the steel ball hole of the fuel injector is a key process step. Since there is an interference fit between the steel ball and the steel ball hole, and the steel ball hole is an inclined hole, it is required that during the press-fitting process, not only the accuracy of the steel ball pressing depth must be ensured, but also the fuel injector body must not be damaged. Therefore, the requirements for the press-fitting device are extremely high, and it is necessary to ensure that the steel ball, steel ball hole and pressure head are on the same axis to achieve accurate and non-destructive press-fitting of the steel ball.

[0003] Traditional steel ball press-fitting methods mostly use manual operations, which has many shortcomings. First, due to the small diameter of the steel ball (such as φ2.381), it is difficult to ensure the accuracy of the steel ball position when placed manually, which directly affects the press-fitting quality. Secondly, during the manual press-fitting process, due to the small force area, there is a risk of the pressure head breaking, which not only increases the operational risk but also reduces the press-fitting efficiency. In addition, the accuracy requirements of the injector body positioning tooling are very high, and traditional manual operations are difficult to meet this requirement, resulting in a low press-fitting pass rate and increased production costs.

[0004] Therefore, developing a device that can automatically, accurately and efficiently complete the steel ball press-fitting task is of great significance to improving the manufacturing quality and production efficiency of the injector. Utility Model Content

[0005] In view of the problems existing in the prior art, the utility model provides a steel ball press-fitting device for a fuel injector.

[0006] The utility model is implemented as follows: a steel ball press-fitting device for a fuel injector comprises a pressure head base, the pressure head base is fixedly mounted on a press workbench, and the pressure head base and the press head are in the same vertical plane;

[0007] A fixture base is installed on the upper surface of the pressure head base, and the fixture base is provided with an inclined support portion, and the support portion is provided with an injector body mounting hole, so that the steel ball hole of the injector body is always vertically upward;

[0008] A positioning sleeve is vertically installed on the upper cross beam of the pressure head base, and a pressure rod with a variable diameter structure is installed in the positioning sleeve. A pressure ring is provided on the upper end face of the pressure rod, and a spring guide rod is provided at the center of the pressure ring. A first spring is provided on the spring guide rod, and the upper end of the first spring is inserted into the center hole of the press head; the pressure rod is inserted into the positioning sleeve, and a compression spring abutting against the step of the inner hole of the positioning sleeve is mounted on the pressure rod in the positioning sleeve.

[0009] Further preferably, the press head base is fixed to the press workbench by means of a T-shaped positioning block and screws.

[0010] Further preferably, the support portion is vertically provided with an injector fixing hole, a flat positioning body matching with the flat position on the injector body is installed in the injector fixing hole, and a knurled flat head screw is threaded on the injector fixing hole on the outer side of the flat positioning body.

[0011] Further preferably, the flat positioning body is provided with two guide holes perpendicular to the installation hole of the injector body, guide posts are installed in the guide holes, and a second spring is sleeved on the guide posts in the fixing hole of the injector.

[0012] Further preferably, a handle is provided at the lower portion of the positioning sleeve.

[0013] Further preferably, a wear-resistant sleeve is sleeved on the outer side of the positioning sleeve, and a wear-resistant sleeve flange on the upper part of the wear-resistant sleeve is fixedly connected to the upper crossbeam through a fastener.

[0014] Further preferably, a gasket is placed above the wear-resistant sleeve.

[0015] Advantages and technical effects of the utility model: The utility model relates to a steel ball press-fitting device for a fuel injector, which achieves significant technical effects through its unique design and optimized structure. The following is a summary of the main technical effects of the device:

[0016] High-precision positioning and press-fitting: The device ensures that the steel ball, steel ball hole and press head are always on the same axis during the press-fitting process through precise fixture design and positioning mechanism, thereby achieving high-precision positioning and press-fitting of the steel ball and greatly improving the press-fitting quality.

[0017] Automated operation: The device adopts an automated design and can automatically complete the placement, positioning and pressing of steel balls, reducing manual operation, lowering the difficulty and error rate of operation and improving production efficiency.

[0018] Uniform distribution of press-fitting force: The spring guide rod and the first spring design in the device, as well as the stepped structure of the press rod, enable the press-fitting force to be evenly distributed on the steel ball, avoiding the problem of pressure deviation or crushing caused by uneven force, and protecting the injector body from damage.

[0019] High adaptability: The device can flexibly adjust the pressing depth by replacing gaskets of different heights to adapt to injector bodies of different specifications and requirements, thereby improving the adaptability and flexibility of the device.

[0020] Easy to operate: The device is equipped with auxiliary operating components such as handles, which enables operators to operate and adjust the equipment more conveniently, improving the convenience of operation.

[0021] Extended service life: The design of the wear-resistant sleeve reduces the friction between the positioning sleeve and the pressure rod, extending the service life of the device, while improving the stability and accuracy of the press-fitting.

[0022] Improve the qualified rate of press-fitting: Due to the above technical characteristics, this device can significantly improve the qualified rate of steel ball press-fitting, reduce the defective rate, and reduce production costs and waste.

[0023] In summary, the steel ball press-fitting device for the fuel injector involved in the utility model realizes high-precision, automated and efficient steel ball press-fitting through its unique design and optimized structure, and significantly improves the manufacturing quality and production efficiency of the fuel injector. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the utility model;

[0025] Figure 2 yes Figure 1 Middle AA section view;

[0026] Figure 3 yes Figure 1 Middle BB section view;

[0027] Figure 4 This is an enlarged view of point C.

[0028] In the figure, 1, fixture base; 1-1, support part; 1-2, injector body mounting hole; 1-3, injector fixing hole; 2, adjusting knurled flat head screw; 3, first spring; 4, spring guide rod; 5, pressure rod; 5-1, pressure ring; 6, gasket; 7, positioning sleeve; 8, compression spring; 9, handle; 10, screw; 11, guide column; 12, flat positioning body; 12-1, guide hole; 13, second spring; 14, T-type positioning block; 15, positioning body; 16, wear-resistant sleeve; 17, fastener; 18, press head; 18-1, center hole; 19, injector body; 20, press head base; 21, screw; 22, T-type positioning block; 23, press workbench; 24, steel ball; 25, steel ball hole. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0030] See also Figures 1 to 4A steel ball press-fitting device for a fuel injector comprises a press head base 20, which is fixedly mounted on a press workbench 23, and the press head base and the press head 18 are in the same vertical plane; the stability and accuracy of the press-fitting device during the press-fitting process are ensured to prevent unstable press-fitting quality caused by vibration or displacement.

[0031] A clamp base 1 is installed on the upper surface of the pressure head base, and the clamp base is provided with an inclined support portion 1-1, and the support portion is provided with an injector body mounting hole 1-2, so that the steel ball hole 25 of the injector body 19 is always vertically upward; the inclined support portion facilitates the installation and positioning of the injector body, and at the same time ensures that the steel ball hole is always vertically upward, which is conducive to the accurate pressing of the steel ball.

[0032] A positioning sleeve 7 is vertically installed on the upper crossbeam of the pressure head base. The positioning sleeve is a hollow structure, and a 60-degree guide cone is provided at the lower end of the positioning sleeve; a pressure rod 5 with a variable diameter structure is installed in the positioning sleeve 7. A pressure ring 5-1 is provided on the upper end surface of the pressure rod, and a spring guide rod 4 is provided in the center of the pressure ring. A spring 3 is provided on the spring guide rod. The upper end of the first spring is inserted into the central hole 18-1 of the press head 18. The design of the spring guide rod and the first spring can buffer the impact force during the press-fitting process, protect the injector body from damage, and ensure the uniform distribution of the press-fitting force; the pressure rod 5 is inserted into the positioning sleeve 7, and a compression spring 8 is sleeved on the pressure rod in the positioning sleeve to abut against the inner hole step of the positioning sleeve. The compression spring plays a role of buffering and resetting during the press-fitting process, ensuring that the pressure rod can be pressed in and out smoothly, and improving the press-fitting accuracy.

[0033] Further preferably, the press head base is fixed to the press workbench 23 by means of a T-shaped positioning block and screws. The fixing method of the T-shaped positioning block and screws is simple and reliable, and can ensure a stable connection between the press head base and the press workbench.

[0034] Further preferably, the support portion is vertically provided with injector fixing holes 1-3, and a flat positioning body 12 that cooperates with the flat position on the injector body is installed in the injector fixing hole, and a knurled flat head screw is threaded on the injector fixing hole on the outside of the flat positioning body. The flat positioning body cooperates with the flat position on the injector body to accurately position the injector body and ensure the accuracy of the press-fitting.

[0035] Further preferably, the flat positioning body is provided with two guide holes 12-1 perpendicular to the mounting hole of the injector body, a guide column 11 is installed in the guide hole, and a second spring 13 is sleeved on the guide column in the fixing hole of the injector; the design of the guide holes and the guide column can ensure the stability of the flat positioning body during the press-fitting process and prevent displacement or rotation.

[0036] Further preferably, a handle 9 is provided at the lower portion of the positioning sleeve, and the design of the handle facilitates the operator to operate and adjust the position of the pressure rod, thereby improving the convenience of operation.

[0037] A gasket 6 is placed above the 16. When the pressure head 5 contacts the gasket 6 during the downward pressing process, it cannot be pressed. By replacing the gaskets 6 of different heights, the effect of controlling the pressing depth is achieved, thereby improving the flexibility and adaptability of the device.

[0038] A wear-resistant sleeve 16 is sleeved on the outer side of the positioning sleeve, and the wear-resistant sleeve flange on the upper part of the wear-resistant sleeve is fixedly connected to the upper crossbeam through a fastener 17. The wear-resistant sleeve can reduce the friction between the positioning sleeve and the pressure rod, extend the service life of the device, and improve the stability and accuracy of the press-fitting.

[0039] During assembly, firstly, the ram base 20 is positioned on the press workbench 23 through the positioning body 15, so that the ram base working groove and the press ram 8 are in the same vertical plane to ensure the accuracy of the subsequent fixture placement, and the ram base 20 is fixed with the T-shaped positioning block 22 and the screw 21 to prevent the problem of tipping during the press-fitting process; the fixture base 1 is fastened to the ram base 20 with the screw 10 and the T-shaped positioning block 14, which can meet the need of adjusting the position of the fixture base 1 while ensuring the fastening of the fixture base 1;

[0040] The angle of the fixture base 1 can ensure that the steel ball hole of the injector body 19 is always vertically upward. The positioning pin 11 and the spring 13 lift the flat positioning body 12 when the knurled flat head screw 2 is loosened, which can facilitate the removal of the injector body 19. When the injector body 19 is installed in the fixture base 1, the positioning sleeve 7 can be lifted by the handle 9, making it more convenient to install and remove the injector body 19; after the positioning sleeve 7 successfully locates the steel ball hole, the first spring 3 presses the positioning sleeve 7 on the steel ball hole through the transmission of the spring guide rod 4, the pressure head 5, and the compression spring 8, so that the operator does not need to manually assist the positioning sleeve 7, reducing the workload.

[0041] The width of the flat positioning body 12 is smaller than the width of the flat position of the injector body 19, so that the injector body 19 can be moved axially, eliminating the influence of slight differences in the position of the steel ball hole due to tolerance. The axial movement and axial rotation of the injector body 1 can be fixed by adjusting the knurled flat head screw 2, so that the steel ball hole is always vertically upward. Due to the small force area and long length of the traditional pressure head, it cannot ensure that the pressure always acts on the steel ball, and there is a risk of pressure deviation and crushing. The pressure head 5 is designed to be stepped, and at the same time cooperates with the spiral compression spring 8 to play a buffering role, so that the pressure head is more evenly stressed. The pressure head 5 is matched with the positioning sleeve 7 in a clearance, and the bottom end of the positioning sleeve 7 is always fixed at the steel ball hole of the injector body 19. When applying pressure, the direction of the force is always guaranteed to be vertically downward, which can minimize the situation where the pressure head 5 is not aligned with the injector body 19 during press-fitting. The gasket 6 plays a role of limiting, ensuring that the distance of each downward movement of the pressure head 5 remains consistent, and indirectly ensuring the depth of the steel ball.

[0042] Place the injector body 19 in the injector body mounting hole on the angled fixture base 1, use the positioning sleeve 7 to position the steel ball hole of the injector body 19, so that the steel ball hole and the pressure head 5 are on the same axis, tighten the knurled flat head screw 2 to position the flat positioning body 12 to press the flat position of the injector body 19 to prevent the injector body 19 from axial rotation or radial movement; the operator manually puts the steel ball 24 into the positioning sleeve 7, at this time, the spring 8 lifts the pressure head 5, and the steel ball 24 can smoothly pass through the positioning sleeve 7 and enter the steel ball of the injector body 19. After pressing the press button, the press head 8 descends and presses the pressure head 5 until the flange of the pressure head 5 contacts the positioning sleeve 6 and stops. At this time, the front end of the pressure head 5 passes through the positioning sleeve 7 to press the steel ball into the steel ball hole of the injector body 19.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel ball press-fitting device for a fuel injector, characterized in that: It comprises a pressing head base (20), which is fixedly mounted on a press workbench (23), and the pressing head base and the pressing head (18) of the press are in the same vertical plane; A fixture base (1) is installed on the upper surface of the pressure head base, and the fixture base is provided with an inclined support portion (1-1), and the support portion is provided with an injector body mounting hole (1-2), so that the steel ball hole (25) of the injector body (19) is always vertically upward; A positioning sleeve (7) is vertically mounted on the upper crossbeam of the pressure head base, a pressure rod (5) with a variable diameter structure is mounted in the positioning sleeve (7), a pressure ring (5-1) is provided on the upper end surface of the pressure rod, a spring guide rod (4) is provided at the center of the pressure ring, a first spring (3) is provided on the spring guide rod, and the upper end of the first spring is inserted into the center hole (18-1) of the press head (18); the pressure rod (5) is inserted into the positioning sleeve (7), and a compression spring (8) is mounted on the pressure rod in the positioning sleeve and abuts against the step of the inner hole of the positioning sleeve.

2. The steel ball press-fitting device for the fuel injector according to claim 1, characterized in that: The press head base is fixed to the press workbench (23) via a T-shaped positioning block and screws.

3. The steel ball press-fitting device for the fuel injector according to claim 1, characterized in that: The support portion is vertically provided with an injector fixing hole (1-3), in which a flat positioning body (12) matching with a flat position on the injector body is installed, and a knurled flat head screw (2) is screwed on the injector fixing hole outside the flat positioning body.

4. The steel ball press-fitting device for the fuel injector according to claim 3, characterized in that: The flat positioning body is provided with two guide holes (12-1) perpendicular to the installation hole of the fuel injector body, a guide column (11) is installed in the guide hole, and a second spring (13) is sleeved on the guide column in the fuel injector fixing hole.

5. The steel ball press-fitting device for a fuel injector according to claim 1, characterized in that: A handle (9) is provided at the lower part of the positioning sleeve (7).

6. The steel ball press-fitting device for the fuel injector according to claim 1, characterized in that: A wear-resistant sleeve (16) is sleeved on the outer side of the positioning sleeve, and a wear-resistant sleeve flange on the upper part of the wear-resistant sleeve is fixedly connected to the upper crossbeam through a fastener (17).

7. The steel ball press-fitting device for the fuel injector according to claim 6, characterized in that: A backing ring (6) is placed above the wear-resistant sleeve (16).

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