A kind of tool for circulating ball steering gear super pressure test

Abstract

This utility model proposes a tooling for overpressure testing of a recirculating ball steering gear, comprising a packaging body, the packaging body including a bolt head, a limiting platform provided on one end face of the bolt head, a first connecting post provided on the end face of the limiting platform away from the bolt head, and threads provided on the outer wall of the first connecting post; a second connecting post coaxially provided on the end face of the first connecting post away from the limiting platform; during the overpressure test of the steering gear, the safety valve is replaced by the packaging body to seal the internal oil passage of the steering gear, preventing internal pressure leakage when the steering gear is pressurized, and improving the accuracy of the overpressure test.

Description

Technical Field

[0001] This utility model belongs to the field of steering gear testing technology, specifically to a tooling for overpressure testing of recirculating ball steering gears. Background Technology

[0002] Common types of steering gears include rack and pinion, recirculating ball, and worm gear crank pin type. Among these, recirculating ball hydraulic steering gears are currently widely used in medium and heavy-duty commercial vehicles. During daily driving, recirculating ball steering gears withstand various forces and pressures, making their performance and reliability crucial. Some steering gears lack a safety valve, while others have one. Currently, heavy-duty vehicles operating at high speeds are equipped with recirculating ball steering gears that include a safety valve to ensure driving safety.

[0003] Overpressure testing is an important method for evaluating the reliability of recirculating ball hydraulic steering systems. It simulates extreme conditions by applying additional pressure (standard is 2.5 times the system pressure) to ensure proper functioning under various operating conditions. Regarding overpressure testing methods, my country's automotive industry standard "972-2014" specifies relevant requirements. Currently, in practice, the conventional method for this test is to fix the steering gear to a fixture and then connect a hydraulic pressurization system between the steering gear's inlet and outlet ports to pressurize the steering gear. For recirculating ball steering systems with safety valves, the system pressure will automatically release pressure when it exceeds the safety pressure during the pressurization test, preventing the target pressure from being reached and thus making the overpressure test impossible. Utility Model Content

[0004] To address the problem that overpressure testing cannot be performed on recirculating ball steering gears equipped with safety valves due to the automatic depressurization of the safety valves, this invention provides a tooling for overpressure testing of recirculating ball steering gears.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model proposes a tooling for overpressure testing of a recirculating ball steering gear, including a packaging body, the packaging body including a bolt head, a limiting platform provided on one end face of the bolt head, a first connecting post provided on the end face of the limiting platform away from the bolt head, and a thread provided on the outer wall of the first connecting post;

[0007] A second connecting post is coaxially arranged on the end face of the first connecting post away from the limiting platform.

[0008] Preferably, a first annular groove with a width of 3cm is provided on the outer wall of the first connecting column at the position where it fits against the limiting platform, and a first sealing ring is installed in the first annular groove.

[0009] Preferably, the first sealing ring is a nitrile rubber sealing ring, the thickness of the first sealing ring is in the range of 2.12cm to 2.28cm, the inner diameter of the first sealing ring is in the range of 17.28cm to 17.52cm, and the outer diameter of the first sealing ring is 22cm.

[0010] Preferably, a chamfer with a width of 0.5 cm is provided at the edge of the first annular groove.

[0011] Preferably, a second annular groove with a width of 2.5 cm is provided on the outer wall of the second connecting post at the end away from the first connecting post, and a second sealing ring is installed in the second annular groove.

[0012] Preferably, the second sealing ring is a nitrile rubber sealing ring, the thickness of the second sealing ring is in the range of 1.62cm to 1.78cm, the inner diameter of the second sealing ring is in the range of 7.58cm to 7.82cm, and the outer diameter of the second sealing ring is 11cm.

[0013] Preferably, the bolt head is hexagonal prism-shaped, the distance between the two parallel end faces of the bolt head is 22cm, and the height of the bolt head is 9cm.

[0014] Preferably, the diameter of the limiting platform is 29cm and the thickness of the limiting platform is 3cm.

[0015] Preferably, the length of the first connecting post is 14cm and the length of the second connecting post is 22cm.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] This utility model proposes a fixture for overpressure testing of a recirculating ball steering gear. The fixture includes a bolt head, a limiting platform, a first connecting post, and a second connecting post. The bolt head provides a standardized clamping position for easy tightening, ensuring convenient installation and controllable tightening force. The limiting platform seals the interface with the steering gear and controls the depth of insertion, preventing over-tightening or under-tightening. The first connecting post's thread matches the steering gear's internal thread, allowing for stable installation. The second connecting post, coaxial with the first connecting post, is inserted first into the interface, guiding the threads to engage smoothly and ensuring the end of the bolt is precisely suspended in a safe position after full tightening, avoiding collision with precision components inside the steering gear.

[0018] Furthermore, in this tooling, a first annular groove is provided between the first connecting post and the limiting platform, and a first sealing ring is installed in the annular groove. When the encapsulation body is installed on the steering gear, the first sealing ring is compressed between the first annular groove and the inner wall of the steering gear interface, forming a reliable static seal, effectively blocking the potential leakage path between the thread root of the first connecting post and the inner wall of the steering gear interface.

[0019] Furthermore, this tooling incorporates a second annular groove on the second connecting column, with a second sealing ring installed within the second arc-shaped groove. This second sealing ring forms an axial end face seal within the steering gear's internal oil passage, creating a double seal in conjunction with the first sealing ring, thereby further enhancing the sealing performance.

[0020] Furthermore, the second connecting post in this fixture has a chamfer with a width of 0.2 on its edge, forming a smooth transition slope. This allows the second sealing ring to slide into the precision hole wall inside the steering gear without damage during installation, and also prevents the second connecting post from scratching the hole wall inside the steering gear. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the tooling for overpressure testing of a recirculating ball steering gear proposed in this utility model;

[0022] Figure 2 This is a front view of the encapsulation body in a tooling for overpressure testing of a recirculating ball steering gear, as proposed in this utility model.

[0023] Figure 3 This is a top view of the encapsulation body in a tooling for overpressure testing of a recirculating ball steering gear according to the present invention.

[0024] In the attached diagram: 1. Sealing body; 10. Bolt head; 11. Limiting platform; 12. First connecting post; 13. Second connecting post; 14. First annular groove; 15. Second annular groove; 2. First sealing ring; 3. Thread; 4. Second sealing ring. Detailed Implementation

[0025] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are 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 are not intended to 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.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0031] This utility model proposes a tooling for overpressure testing of recirculating ball steering gears, such as... Figures 1-3As shown, it includes a sealing body 1, which is provided with threads 3. The sealing body 1 is installed on the steering gear at the interface after the safety valve is removed via the threads 3. The sealing body 1 replaces the safety valve to seal the interface of the steering gear. In conjunction with the oil delivery system connected to the steering gear, the steering gear is subjected to overpressure detection. This can seal the internal oil passage of the steering gear to prevent internal pressure leakage when the steering gear is pressurized, so that the pressure inside the steering gear reaches the pressure value required for the overpressure test.

[0032] like Figures 1-3 As shown, the sealing body 1 includes a bolt head 10. A limiting platform 11 is connected to one end of the bolt head 10. The limiting platform 11 is concentrically arranged with the bolt head 10. The diameter of the limiting platform 11 is 29cm and the thickness is 3cm. A first connecting post 12 is provided on the end face of the limiting platform 11 away from the bolt head 10. The first connecting post 12 is located at the center of the limiting platform 11 so that the first connecting post 12 is concentrically arranged with the limiting platform 11. A thread 3 is provided on the outer wall of the first connecting post 12. A second connecting post 13 is provided, which is concentrically arranged with the first connecting post 12. The length of the first connecting post 12 is 14cm, and the length of the second connecting post 13 is 22cm. When the sealing body 1 is installed on the interface after the safety valve is removed on the steering gear, the bolt head 10 is rotated by clamping the wrench so that the thread 3 on the outer wall of the first connecting post 12 engages with the thread in the interface after the safety valve is removed on the steering gear, thereby fixing the sealing body 1 on the steering gear. The second connecting post 13 is located inside the steering gear, which plays a mechanical limiting role.

[0033] like Figure 1 and Figure 2 As shown, a first annular groove 14 with a width of 3cm is provided on the outer wall of the first connecting post 12 at the position where it fits against the limiting platform 22. A chamfer with a width of 0.5cm is provided at the edge of the first annular groove 14. A first sealing ring 2 is installed in the first annular groove 14. The first sealing ring 2 is a nitrile rubber sealing ring with a thickness ranging from 2.12cm to 2.28cm, an inner diameter ranging from 17.28cm to 17.52cm, and an outer diameter of 22cm. The first connecting post 12 is provided with a first... An annular groove 14 and its installed first sealing ring 2, by installing the first sealing ring 2 at the position where the first connecting column 12 is connected to the limiting platform 11, so that a radial compression seal is formed after the sealing body 1 is screwed into the steering gear interface, effectively blocking the path of high pressure oil leakage along the thread gap, ensuring that the internal oil circuit of the steering gear reaches a completely closed state during the overpressure test, preventing the test pressure from dropping due to seal failure, meeting the stringent requirements of overpressure testing for system sealing, and at the same time, the nitrile rubber sealing ring can provide excellent oil resistance and elastic recovery ability, ensuring sealing reliability and durability.

[0034] like Figure 1 and Figure 2 As shown, a second annular groove 15 with a width of 2.5cm is provided on the outer wall of the second connecting post 13 at the end away from the first connecting post 12. A second sealing ring 4 is installed in the second annular groove 15. The second sealing ring 4 is a nitrile rubber sealing ring with a thickness ranging from 1.62cm to 1.78cm, an inner diameter ranging from 7.58cm to 7.82cm, and an outer diameter of 11cm. When the encapsulation body 1 is installed on the interface after the safety valve is removed from the steering gear, the second connecting post 13 extends into the steering gear. The second sealing ring 4 installed on the end of the second connecting post 13 away from the first connecting post 12 forms an axial end face seal in the oil circuit inside the steering gear. Together with the radial thread seal on the first connecting post 12, it forms a two-stage sealing system, completely blocking the path of high-pressure oil leakage from the interface end face or internal gap, and ensuring the absolute sealing integrity of the steering gear's closed cavity during the overpressure test.

[0035] like Figure 3 As shown, the bolt head 10 is a hexagonal prism. The distance between the two parallel end faces of the bolt head 10 is 22cm. The height of the bolt head 10 is 9cm. The bolt head 10 is cut off in a direction that is parallel to the upper end face of the bolt head 10 and perpendicular to the height of the bolt head 10. The resulting cross-section is a parallel hexagon with a circumcircle diameter of 29cm.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model 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 basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications made to the technical solutions based on the technical concept proposed by this utility model shall fall within the scope of protection of the claims of this utility model.

Claims

1. A tooling for overpressure testing of a recirculating ball steering gear, characterized in that, The package includes a packaging body (1), the packaging body (1) includes a bolt head (10), a limiting platform (11) is provided on one end face of the bolt head (10), a first connecting post (12) is provided on the end face of the limiting platform (11) away from the bolt head (10), and a thread (3) is provided on the outer wall of the first connecting post (12). A second connecting post (13) is coaxially arranged on one end face of the first connecting post (12) away from the limiting platform (11).

2. The tooling for overpressure testing of a recirculating ball steering gear according to claim 1, characterized in that, A first annular groove (14) with a width of 3cm is provided on the outer wall of the first connecting column (12) at the position where it fits the limiting platform (11), and a first sealing ring (2) is installed in the first annular groove (14).

3. The tooling for overpressure testing of a recirculating ball steering gear according to claim 2, characterized in that, The first sealing ring (2) is a nitrile rubber sealing ring. The thickness of the first sealing ring (2) ranges from 2.12cm to 2.28cm, the inner diameter of the first sealing ring (2) ranges from 17.28cm to 17.52cm, and the outer diameter of the first sealing ring (2) is 22cm.

4. The tooling for overpressure testing of a recirculating ball steering gear according to claim 2, characterized in that, The first annular groove (14) has a chamfer with a width of 0.5cm at the position of its edge.

5. The tooling for overpressure testing of a recirculating ball steering gear according to claim 1, characterized in that, A second annular groove (15) with a width of 2.5cm is provided on the outer wall of the second connecting post (13) away from the end of the first connecting post (12), and a second sealing ring (4) is installed in the second annular groove (15).

6. The tooling for overpressure testing of a recirculating ball steering gear according to claim 5, characterized in that, The second sealing ring (4) is a nitrile rubber sealing ring. The thickness of the second sealing ring (4) ranges from 1.62cm to 1.78cm, the inner diameter of the second sealing ring (4) ranges from 7.58cm to 7.82cm, and the outer diameter of the second sealing ring (4) is 11cm.

7. The tooling for overpressure testing of a recirculating ball steering gear according to claim 1, characterized in that, The bolt head (10) is hexagonal prism, the distance between the two parallel end faces of the bolt head (10) is 22cm, and the height of the bolt head (10) is 9cm.

8. The tooling for overpressure testing of a recirculating ball steering gear according to claim 1, characterized in that, The diameter of the limiting platform (11) is 29cm and the thickness of the limiting platform (11) is 3cm.

9. The tooling for overpressure testing of a recirculating ball steering gear according to claim 1, characterized in that, The length of the first connecting post (12) is 14cm, and the length of the second connecting post (13) is 22cm.

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