Claims:
We Claim

1. A compression spring (10) for a high pressure fuel pump, said compression spring (10) comprising:
a first portion (12) comprising a first hooked portion (14) at one end and a plurality of first screw threads (16) defined at an opposite second end, wherein said first portion (12) is inserted through a bore that is defined in a first plate (18) and screwed on to a first plurality of screw threads (20) that is defined in a second plate (22);
a second portion (24) comprising a second hooked portion (26) at one end and a plurality of second screw threads (28) defined at an opposite second end, wherein said second portion (24) is inserted through a bore that is defined in said second plate (22) and screwed on to a second plurality of screw threads (30) that is defined in said first plate (18); and
a plurality of spring elements (32) secured between said first hooked portion (14) and said second hooked portion (26), said plurality of spring elements (32) adapted to be compressed when a tensile load is applied on said first hooked portion (14) and said second hooked portion (26) thereby causing a compression of said plurality of spring elements (32).

2. The compression spring (10) for a high pressure fuel pump in accordance with Claim 1 wherein said first plate (18) and said second plate (22) each comprises a projection (34,36), wherein each projection (34,36) is received within opposing ends of said compression spring (32) to facilitate securing said first plate (18) and said second plate (22) to said compression spring (32).

3. The compression spring (10) for a high pressure fuel pump in accordance with Claim 1 wherein said first portion (12) and said second portion (24) are each manufactured of a material of greater stiffness and of a greater diameter than said plurality of spring elements (32).
, Description:Complete Specification:

The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed.
Field of the invention
[0001] This invention relates to a compression spring, and more specifically to a compression spring for a high pressure fuel pump.

Background of the invention
[0002] IN 201941043087 A describes a compression spring for a high pressure fuel pump. The compression spring comprises a first end portion comprising a first hooked portion, and a second end portion comprising a second hooked portion. A plurality of spring elements are secured between the first hooked portion and the second hooked portion, wherein a first end of the plurality of spring elements is inserted through the first hooked portion by winding the first end of the plurality of spring elements around the first hooked portion such that the first hooked portion is inserted within the first end of the plurality of spring elements, and wherein a second end of the plurality of spring elements is inserted through the second hooked portion by winding the second end of the plurality of spring elements around the second hooked portion such that the second hooked portion is inserted within the second end of the plurality of spring elements.

Brief description of the accompanying drawing
[0003] Figure 1 illustrates a compression spring for a high pressure fuel pump in one embodiment of the invention.

Detailed description of the embodiments
[0004] Figure 1 illustrates a compression spring 10 for a high pressure fuel pump in one embodiment of the invention. The compression spring 10 for the high pressure fuel pump comprises a first portion 12 comprising a first hooked portion 14 at one end and a plurality of first screw threads 16 defined at an opposite second end, wherein the first portion 12 is inserted through a bore that is defined in a first plate 18 and screwed on to a first plurality of screw threads 20 that is defined in a second plate 22. A second portion 24 comprising a second hooked portion 26 at one end and a plurality of second screw threads 28 defined at an opposite second end, wherein the second portion 24 is inserted through a bore that is defined in the second plate 22 and screwed on to a second plurality of screw threads 30 that is defined in the first plate 18. A plurality of spring elements 32 is secured between the first hooked portion 14 and the second hooked portion 26, the plurality of spring elements 32 adapted to be compressed when a tensile load is applied on the first hooked portion 14 and the second hooked portion 26 thereby causing a compression of the compression spring 32.

[0005] The compression spring 10 for the high pressure fuel pump comprises a first portion 12 comprising a first hooked portion 14 at one end. An elongated rod portion extends from the first hooked portion 14 and culminates in an opposite second end. In an exemplary embodiment of the invention, the opposite second end of the first hooked portion 14 comprises a plurality of first screw threads 16 that are defined therein. More specifically, the first portion 12 is inserted through a bore that is defined in a first plate 18 and therein screwed on to a plurality of mating screw threads 20 that are defined in a second plate 22. More specifically, the second plate 22 is spaced apart from the first plate 18 and comprises a plurality of second screw threads 20 that are defined in a bore that is defined in the second plate 22. The screw threads 16 that are defined on the first portion 12 mates with the plurality of second screw threads 20 that are defined in the bore of the second plate 22.

[0006] The compression spring 10 for the high pressure fuel pump comprises a second portion 24 comprising a second hooked portion 26 at one end. An elongated rod portion extends from the second hooked portion 26 and culminates in an opposite second end. In an embodiment of the invention, the opposite second end of the second hooked portion 26 comprises a plurality of screw threads 29 that are defined therein. More specifically, the second portion 24 is inserted through the bore that is defined in the second plate 22 and therein screwed on to a plurality of mating screw threads 30 that are defined in the first plate 18. More specifically, the second plate 22 is spaced apart from the first plate 18 and comprises a plurality of screw threads that are defined in a bore of the second plate 22. The screw threads 16 that are defined on the first portion 12 mates with the plurality of screw threads 16 that are defined in the bore of the second plate 22.

[0007] In the exemplary embodiment, a plurality of spring elements 32 is secured between the first hooked portion 14 and the second hooked portion 26. When the first hooked portion 14 is subjected to a tensile load, the first portion 12 that is secured to the second plate 22 causes the second plate 22 to compress against the spring member 32. Similarly, when the second hooked portion 26 is subjected to a tensile load, the second portion 24 that is secured to the first plate 18 causes the first plate 18 to compress against the spring member 32. Therefore, as the compression spring 32 gets compressed owing to the elongation of the first hooked portion 14 and the second hooked portion 26, the plurality of spring elements 32 is compressed as a consequence. The compression of the spring elements 32 while causing the elongation of the first hooked portion 14 and the second hooked portion 26 allows the spring elements 32 to be retained over several more cycles of operation as compared to a tension spring of spring elements having a similar diameter. Moreover, in order to increase a load carrying capacity of the compression spring 10, the first hooked portion 14 and the second hooked portion 26 may be manufactured of a diameter and material that is greater and stiffer respectively than that of the plurality of spring elements 32. This arrangement allows for the compression spring 10 to be used as a tension spring while increasing the longevity of the compression spring 10.

[0008] It must be understood that the embodiments explained above are only illustrative and do not limit the scope of the disclosure. Many modifications in the embodiments with regard to dimensions of various components are envisaged and form a part of this invention. The scope of the invention is only limited by the scope of the claims.