Compression spring for high-pressure fuel pump

Abstract

Compression spring for high pressure fuel pump. A compression spring 10 for a high pressure fuel pump is described. The compression spring 10 comprises a first portion 12 comprising a first hook portion 14 at one end and a plurality of first threads 16 defined at an opposite second end, wherein the first portion 12 is inserted through a hole defined in a first plate 18 and screwed onto threads 20 defined in a second plate 22. A second portion 24 comprises a second hook portion 26 at one end and a plurality of second threads 28 defined at an opposite second end, wherein the second portion 24 is inserted through a hole defined in the second plate 22 and screwed onto threads 30 defined in the first plate 18. A plurality of spring elements 32 are secured between the first hook portion 14 and the second hook portion 26.

Description

Technical Field

[0001] This invention relates to compression springs, and more particularly to compression springs for high-pressure fuel pumps. Background Technology

[0002] A compression spring for a high-pressure fuel pump is described in 201941043087. The compression spring includes a first end portion having a first hook-shaped portion and a second end portion having a second hook-shaped portion. A plurality of spring elements are fixed between the first and second hook-shaped portions, wherein the first ends of the plurality of spring elements are inserted through the first hook-shaped portion by wrapping the first ends of the plurality of spring elements around the first hook-shaped portion such that the first hook-shaped portion is inserted into the first ends of the plurality of spring elements, and wherein the second ends of the plurality of spring elements are inserted through the second hook-shaped portion by wrapping the second ends of the plurality of spring elements around the second hook-shaped portion such that the second hook-shaped portion is inserted into the second ends of the plurality of spring elements. Summary of the Invention

[0003] The present invention provides a compression spring for a high-pressure fuel pump, the compression spring comprising: a first plate defining a first hole and a plurality of threads; a second plate spaced apart from the first plate and defining a second hole and a plurality of threads; a first portion including a first hook-shaped portion at one end and a first elongated rod portion extending from the first hook-shaped portion and terminating in an opposing second end, the plurality of first threads being defined at the opposing second end of the first portion, wherein the first elongated rod portion is inserted through the first hole of the first plate and screwed onto the plurality of threads of the second plate; and a second portion. The plate includes a second hook-shaped portion at one end and a second elongated rod portion extending from the second hook-shaped portion and ending at an opposing second end, wherein a plurality of second threads are defined at the opposing second ends of the second portion, wherein the second elongated rod portion is inserted through a second hole in the second plate and screwed onto a second plurality of threads in the first plate via the plurality of second threads; and a plurality of spring elements fixed between the first hook-shaped portion and the second hook-shaped portion, wherein the plurality of spring elements are adapted to be compressed between the first plate and the second plate when a tensile load is applied to the first hook-shaped portion and the second hook-shaped portion, thereby causing the plurality of spring elements to compress.

[0004] In one example, the first plate and the second plate each include a protrusion, wherein each protrusion is received within opposite ends of the plurality of spring elements to facilitate securing the first plate and the second plate to the plurality of spring elements.

[0005] In yet another example, the first and second portions are made of materials having greater stiffness and larger diameter than the plurality of spring elements, respectively. Attached Figure Description

[0006] Figure 1 A compression spring for a high-pressure fuel pump is shown in one embodiment of the invention. Detailed Implementation

[0007] Figure 1 A compression spring 10 for a high-pressure fuel pump according to one embodiment of the present invention is shown. The compression spring 10 for the high-pressure fuel pump includes a first portion 12 comprising a first hook-shaped portion 14 at one end and a plurality of first threads 16 defined at opposing second ends, wherein the first portion 12 is inserted through a hole defined in a first plate 18 and screwed onto a plurality of first threads 20 defined in a second plate 22. A second portion 24 comprises a second hook-shaped portion 26 at one end and a plurality of second threads 28 defined at opposing second ends 22, wherein the second portion 24 is inserted through a hole defined in the second plate 22 and screwed onto a plurality of second threads 30 defined in the first plate 18. A plurality of spring elements 32 are fixed between the first hook-shaped portion 14 and the second hook-shaped portion 26, and when a tensile load is applied to the first hook-shaped portion 14 and the second hook-shaped portion 26, the plurality of spring elements 32 are adapted to compress, thereby causing compression of the compression spring 32.

[0008] The compression spring 10 for a high-pressure fuel pump includes a first portion 12, which includes a first hook-shaped portion 14 at one end. An elongated rod portion extends from the first hook-shaped portion 14 and terminates in an opposing second end. In an exemplary embodiment of the invention, the opposing second end of the first hook-shaped portion 14 includes a plurality of first threads 16 defined therein. More specifically, the first portion 12 is inserted through a hole defined in a first plate 18 and screwed therein onto a plurality of mating threads 20 defined in a second plate 22. More specifically, the second plate 22 is spaced apart from the first plate 18 and includes a plurality of second threads 20 defined in a hole defined in the second plate 22. The threads 16 defined on the first portion 12 engage with the plurality of second threads 20 defined in the hole defined in the second plate 22.

[0009] The compression spring 10 for a high-pressure fuel pump includes a second portion 24, which includes a second hook-shaped portion 26 at one end. An elongated rod portion extends from the second hook-shaped portion 26 and terminates in an opposing second end. In an embodiment of the invention, the opposing second ends of the second hook-shaped portion 26 include a plurality of threads 29 defined therein. More specifically, the second portion 24 is inserted through a hole defined in a second plate 22 and screwed therein onto a plurality of mating threads 30 defined in a first plate 18. More specifically, the second plate 22 is spaced apart from the first plate 18 and includes a plurality of threads defined in a hole in the second plate 22. Threads 16 defined on the first portion 12 engage with the plurality of threads 16 defined in the hole in the second plate 22.

[0010] In an exemplary embodiment, the first plate 18 and the second plate 22 each include protrusions 34, 36, each protrusion 34, 36 being received within opposite ends of a plurality of spring elements 32 to facilitate securing the first plate 18 and the second plate 22 to the plurality of spring elements 32. The plurality of spring elements 32 are secured between a first hook portion 14 and a second hook portion 26. When the first hook portion 14 is subjected to a tensile load, the first portion 12 secured to the second plate 22 causes the second plate 22 to compress against the spring element 32. Similarly, when the second hook portion 26 is subjected to a tensile load, the second portion 24 secured to the first plate 18 causes the first plate 18 to compress against the spring element 32. Thus, when the compression spring 32 is compressed due to the elongation of the first hook portion 14 and the second hook portion 26, the plurality of spring elements 32 are thus compressed. Compared to a tension spring with spring elements of similar diameter, the compression of the spring elements 32 allows the spring elements 32 to be held in more operating cycles while causing the first hook portion 14 and the second hook portion 26 to elongate. Furthermore, to increase the load-bearing capacity of the compression spring 10, the first hook portion 14 and the second hook portion 26 can be made of materials with larger diameters and greater stiffness than the plurality of spring elements 32, respectively. This arrangement allows the compression spring 10 to be used as a tension spring while increasing the lifespan of the compression spring 10.

[0011] It must be understood that the embodiments described above are merely exemplary and do not limit the scope of this disclosure. Numerous modifications to the dimensions of various components are contemplated in the embodiments and form part of this invention. The scope of this invention is limited only by the scope of the claims.

Claims

1. A compression spring (10) for a high-pressure fuel pump, the compression spring (10) comprising: First plate (18), the first plate (18) defines a first hole and a second plurality of threads (30); The second plate (22) is spaced apart from the first plate (18) and defines a second hole and a first plurality of threads (20). The first part (12) includes a first hook-shaped portion (14) at one end and a first elongated rod portion extending from the first hook-shaped portion (14) and ending at an opposing second end, wherein a plurality of first threads (16) are defined at the opposing second ends of the first part (12), wherein the first elongated rod portion is inserted through the first hole of the first plate (18) and screwed onto the first plurality of threads (20) of the second plate (22) by the plurality of first threads (16); The second part (24) includes a second hook-shaped portion (26) at one end and a second elongated rod portion extending from the second hook-shaped portion (26) and ending at an opposing second end, wherein a plurality of second threads (28) are defined at the opposing second ends of the second part (24), wherein the second elongated rod portion is inserted through a second hole in the second plate (22) and screwed onto a second plurality of threads (30) of the first plate (18) by the plurality of second threads (28); and A plurality of spring elements (32) are fixed between the first hook portion (14) and the second hook portion (26). When a tensile load is applied to the first hook portion (14) and the second hook portion (26), the plurality of spring elements (32) are adapted to be compressed between the first plate (18) and the second plate (22), thereby causing the plurality of spring elements (32) to be compressed.

2. The compression spring (10) for a high-pressure fuel pump according to claim 1, characterized in that, The first plate (18) and the second plate (22) each include a protrusion (34, 36), wherein each protrusion (34, 36) is accommodated within the opposite ends of the plurality of spring elements (32) to facilitate securing the first plate (18) and the second plate (22) to the plurality of spring elements (32).

3. The compression spring (10) for a high-pressure fuel pump according to claim 1, characterized in that, The first part (12) and the second part (24) are made of materials having greater stiffness and larger diameter than the plurality of spring elements (32).

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