A double ended screw tightening sleeve retraction mechanism for pump body assembly

Abstract

The utility model provides a kind of double-end screw rod tightening sleeve retreat mechanism for pump body assembly, it makes that double-end screw rod will not retreat in the process of tightening sleeve back, and further ensure that double-end screw rod is firmly and reliably installed.It includes: tightening gun power head;Power transmission shaft;Tightening sleeve;Multi-threaded screw;And double-end screw rod compression head;The input end of power transmission shaft is fixedly connected to the output end of tightening gun power head, the outer periphery of the output end of power transmission shaft is provided with guide straight slot, the tightening sleeve includes upper guide mounting end, lower threaded connection end, the upper guide mounting end includes the positioning hole corresponding to the thickness direction through of guide straight slot ring arrangement, the ring wall in the guide cavity of the upper guide mounting end is also provided with a guide internal thread hole, the guide internal thread hole is adapted to the multi-threaded setting of multi-threaded screw, the lower threaded connection end includes upper guide hole, lower threaded connection hole.

Description

Technical Field

[0001] This utility model relates to the technical field of double-headed screw assembly, specifically a double-headed screw tightening sleeve retraction mechanism for pump body assembly. Background Technology

[0002] The common rail fuel system consists of a fuel injection pump, injectors, a fuel rail, and an ECU (Electronic Control Unit). A high-pressure fuel pump delivers high-pressure fuel to the fuel rail, precisely controlling the fuel pressure within the rail. This pressure is independent of engine speed, minimizing fuel pressure fluctuations with engine speed. During pump assembly, a double-ended screw is tightened. Current technology typically tightens the double-ended screw by tightening a sleeve threaded connection at the upper end of the screw. The mechanism synchronously drives the tightening sleeve and the double-ended screw to rotate, thereby securing the lower section of the double-ended screw to the corresponding position on the pump body. However, when the tightening sleeve needs to be retracted, because the head of the double-ended screw is threadedly connected to the tightening sleeve, when the tightening sleeve rotates in the opposite direction to retract, the double-ended screw will retract along with the tightening sleeve, resulting in improper installation of the double-ended screw and unstable quality of subsequent products. Therefore, it is urgent to develop a mechanism that can ensure that the double-ended screw does not retract after it is assembled and the tightening sleeve is retracted. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a double-ended screw tightening sleeve retraction mechanism for pump body assembly, which ensures that the double-ended screw will not retract during the retraction of the tightening sleeve, thereby ensuring the stable and reliable installation of the double-ended screw.

[0004] A double-ended screw tightening sleeve retraction mechanism for pump body assembly, characterized in that it comprises:

[0005] Tighten the gun power head;

[0006] Drive shaft;

[0007] Tighten the sleeve;

[0008] Multi-start threaded screws;

[0009] And a double-ended screw clamping head;

[0010] The output end of the tightening gun's power head is fixedly connected to the input end of the power transmission shaft. A guide linear groove is provided on the outer periphery of the output end of the power transmission shaft. The tightening sleeve includes an upper guide mounting end and a lower threaded connection end. The upper guide mounting end includes a positioning hole that penetrates through the thickness direction of the guide linear groove. A guide internal thread hole is also provided within the annular wall of the guide cavity of the upper guide mounting end. The guide internal thread hole is adapted to accommodate the multi-start thread of a multi-start screw. The lower threaded connection end includes an upper guide hole and a lower threaded connection hole. The inner cavity of the upper guide mounting end is connected to the [unclear - possibly a device or device] through a through hole. The upper guide hole of the lower threaded connection end is described above. The output end of the power transmission shaft is inserted into the guide cavity. The positioning pin of the ring cloth passes through the positioning hole radially from the outside to the inside, and the head is located in the guide straight groove. The multi-threaded screw is connected to the guide internal thread hole. In the tightened state, the lower end of the power transmission shaft is close to the upper end of the multi-threaded screw. The lower end of the multi-threaded screw presses the upper part of the double-ended screw clamping head. The lower part of the double-ended screw clamping head passes through the upper guide hole and presses the double-ended screw to be installed. The upper thread of the double-ended screw is inserted and connected to the lower threaded connection hole.

[0011] In the retracted state, when the tightening sleeve rotates in the reverse direction, the multi-threaded screw moves downward along the guide internal thread hole, driving the double-ended screw clamping head to move downward, thereby offsetting the upward distance of the tightening sleeve relative to the double-ended screw.

[0012] Its further features are:

[0013] The guide internal thread hole and the lower threaded connection hole are arranged in opposite directions;

[0014] The length of the guide straight groove ensures that when the tightening sleeve is retracted, the double-ended screw clamping head continues to press against the top of the double-ended screw.

[0015] With the structure of this utility model, a multi-threaded screw is provided at the inner end of the tightening sleeve, and a guide internal thread hole with the opposite rotation direction to the lower threaded connection hole is provided. In the retraction state, when the tightening sleeve rotates in the reverse direction, the multi-threaded screw moves downward along the guide internal thread hole, driving the double-ended screw clamping head to move downward, thereby offsetting the upward distance of the tightening sleeve relative to the double-ended screw. This ensures that the double-ended screw will not retract during the retraction of the tightening sleeve, thus ensuring that the double-ended screw is installed stably and reliably. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0017] The names corresponding to the serial numbers in the diagram are as follows:

[0018] Tightening gun power head 10, power transmission shaft 20, guide straight groove 21, tightening sleeve 30, upper guide mounting end 31, lower threaded connection end 32, positioning hole 33, guide internal thread hole 34, upper guide hole 35, lower threaded connection hole 36, through hole 37, guide cavity 38, multi-head threaded screw 40, double-headed screw clamping head 50, positioning pin 60, double-headed screw 70. Detailed Implementation

[0019] A double-ended screw tightening sleeve retraction mechanism for pump body assembly, see Figure 1 It includes a tightening gun power head 10, a power transmission shaft 20, a tightening sleeve 30, a multi-threaded screw 40, and a double-ended screw clamping head 50;

[0020] The output end of the tightening gun power head 10 is fixedly connected to the input end of the power transmission shaft 20. A guide straight groove 21 is provided on the outer periphery of the output end of the power transmission shaft 20. The tightening sleeve 30 includes an upper guide mounting end 31 and a lower threaded connection end 32. The upper guide mounting end 31 includes a positioning hole 33 that passes through the thickness direction of the guide straight groove 21. A guide internal thread hole 34 is also provided within the annular wall of the guide cavity 38 of the upper guide mounting end 31. The guide internal thread hole 34 is adapted to accommodate the multi-start thread of the multi-start screw 40. The lower threaded connection end 32 includes an upper guide hole 35 and a lower threaded connection hole 36. The guide cavity of the upper guide mounting end 31 passes through… The through hole 37 connects to the upper guide hole 35 of the lower threaded connection end 32. The output end of the power transmission shaft 20 is inserted into the guide cavity 38. The positioning pin 60 of the ring cloth passes through the positioning hole 33 radially from the outside to the inside, and the head is located in the guide straight groove 21. The multi-head thread of the multi-head threaded screw 40 is connected to the guide internal threaded hole 34. In the tightened state, the lower end of the power transmission shaft 20 is close to the upper end of the multi-head threaded screw 40. The lower end of the multi-head threaded screw 40 presses the upper part of the double-headed screw clamping head 50. The lower part of the double-headed screw clamping head 50 passes through the upper guide hole 35 and presses the double-headed screw 70 to be installed. The upper thread of the double-headed screw 70 is inserted and connected to the lower threaded connection hole 36.

[0021] In the retracted state, when the tightening sleeve 30 rotates in the reverse direction, the multi-threaded screw 40 moves downward along the guide internal thread hole 34, driving the double-ended screw clamping head 50 to move downward, thereby offsetting the upward distance of the tightening sleeve 30 relative to the double-ended screw 70.

[0022] In practice, the guide internal thread hole 34 and the lower threaded connection hole 36 are set in opposite directions;

[0023] The length of the guide straight groove 21 ensures that when the tightening sleeve 30 retracts, the double-ended screw clamping head 50 continues to press against the top of the double-ended screw 70.

[0024] Its working principle is as follows: A multi-threaded screw is set at the inner end of the tightening sleeve, and a guide internal thread hole with the opposite rotation direction to the lower threaded connection hole is also set. In the retraction state, when the tightening sleeve rotates in the reverse direction, the multi-threaded screw moves downward along the guide internal thread hole, which drives the double-ended screw clamping head to move downward, thereby offsetting the upward distance of the tightening sleeve relative to the double-ended screw. This ensures that the double-ended screw will not retract during the retraction of the tightening sleeve, thus ensuring that the double-ended screw is installed firmly and reliably.

[0025] It will be apparent to those skilled in the art that this invention 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 essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] 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 also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A double-ended screw tightening sleeve retraction mechanism for pump body assembly, characterized in that, It includes: Tighten the gun power head; Drive shaft; Tighten the sleeve; Multi-start threaded screws; And a double-ended screw clamping head; The output end of the tightening gun's power head is fixedly connected to the input end of the power transmission shaft. A guide linear groove is provided on the outer periphery of the output end of the power transmission shaft. The tightening sleeve includes an upper guide mounting end and a lower threaded connection end. The upper guide mounting end includes a positioning hole that penetrates through the thickness direction of the guide linear groove. A guide internal thread hole is also provided within the annular wall of the guide cavity of the upper guide mounting end. The guide internal thread hole is adapted to accommodate the multi-start thread of a multi-start screw. The lower threaded connection end includes an upper guide hole and a lower threaded connection hole. The inner cavity of the upper guide mounting end is connected to the [unclear - possibly a device or device] through a through hole. The upper guide hole of the lower threaded connection end is described above. The output end of the power transmission shaft is inserted into the guide cavity. The positioning pin of the ring cloth passes through the positioning hole radially from the outside to the inside, and the head is located in the guide straight groove. The multi-threaded screw is connected to the guide internal thread hole. In the tightened state, the lower end of the power transmission shaft is close to the upper end of the multi-threaded screw. The lower end of the multi-threaded screw presses the upper part of the double-ended screw clamping head. The lower part of the double-ended screw clamping head passes through the upper guide hole and presses the double-ended screw to be installed. The upper thread of the double-ended screw is inserted and connected to the lower threaded connection hole. In the retracted state, when the tightening sleeve rotates in the reverse direction, the multi-threaded screw moves downward along the guide internal thread hole, driving the double-ended screw clamping head to move downward, thereby offsetting the upward distance of the tightening sleeve relative to the double-ended screw.

2. The double-ended screw tightening sleeve retraction mechanism for pump body assembly according to claim 1, characterized in that: The guide internal thread hole and the lower threaded connection hole are arranged in opposite directions.

3. The double-ended screw tightening sleeve retraction mechanism for pump body assembly according to claim 1, characterized in that: The length of the guide straight groove ensures that when the tightening sleeve is retracted, the double-ended screw clamping head continues to press against the top of the double-ended screw.

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