Claims:We Claim

1. A gear withdrawal tool (10) for withdrawing a gear of a high pressure fuel pump, said gear withdrawal tool (10) comprising:
a first arm (12), said first arm (12) comprising an L-shaped portion;
a second arm (14), said second arm (14) comprising a U-shaped portion, an end of said U-shaped portion secured to an end of said L-shaped portion by means of a pivot screw (16);
a sleeve (18) adapted to be inserted through said first arm (12) and said second arm (14), said sleeve (18) adapted to prevent said first arm (12) and said second arm (14) from moving away from one another when a shaft of said high pressure fuel pump is secured between said first arm (12) and said second arm (14);
a screw (20) comprising a plurality of screw threads (22) defined on said screw (20) and secured to a plurality of screw threads (24) defined on said sleeve (18) and adapted to reciprocate within said sleeve (18) by rotating said screw (20);
a plurality of screw threads (26) defined in a bore (28) of said U-shaped portion and aligned with an axis of said screw (20), said screw (20) inserted through the plurality of screw threads (26) defined in the bore (28) of said U-shaped portion such that the rotation of said screw (20) causes a reciprocation of said first arm (12) and said second arm (14) within said sleeve (18) of said gear withdrawal tool (10).

, 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 gear withdrawal tool, and more specifically to a gear withdrawal tool for withdrawing a gear of a high pressure fuel pump.

Background of the invention
[0002] US 2728977 A describes an abutment tool adapted for use with an engine of the type having a cam shaft. A fuel pump opening in adjacency to the cam shaft, and a fuel pump is removably mounted over the opening. Upon removal of the fuel pump, the tool including a plate of a size to overlie and cover the fuel pump opening. A hollow sleeve is secured at one end to the plate, the longitudinal axis of the sleeve being deflected perpendicular relative to the plane of the plate. A plunger is coaxially slidably mounted in the sleeve, the plunger being of a length to extend beyond the opposite ends of the sleeve. One end of the plunger extends beyond the plate end of the sleeve through and beyond the plate, and a flat blade-like abutment member rigidly fixed substantially in tangency to one side of the plunger end. The face of the plunger end is being so flat and substantially perpendicular to the abutment member, the tool being mountable on the engine and when so mounted being disposed so that the axis is perpendicular to the axis of the engine cam shaft. The plunger end face substantially abuts the periphery of a shaft-carried cam. The abutment extends into engagement with a cam carried by the cam shaft, whereby to limit endwise cam shaft movement during replacement of the gearing on the cam shaft.

Brief description of the accompanying drawing
[0003] Figure 1 illustrates a gear withdrawal tool for withdrawing a gear of a high pressure fuel pump.

Detailed description of the embodiments
[0004] Figure 1 illustrates a gear withdrawal tool 10 for withdrawing a gear of a high pressure fuel pump. The gear withdrawal tool 10 comprises a first arm 12, the first arm 12 comprising an L-shaped portion and a second arm 14, the second arm 14 comprising a U-shaped portion. An end of the U-shaped portion is secured to an end of the L-shaped portion by means of a pivot screw 16. A sleeve 18 is adapted to be inserted through the first arm 12 and the second arm 14, the sleeve 18 adapted to prevent the first arm 12 and the second arm 14 from moving away from one another when a shaft of the high pressure fuel pump is secured between the first arm 12 and the second arm 14. A screw 20 comprising a plurality of screw threads 22 is defined on the screw 20 and secured to a plurality of screw threads 24 defined on the sleeve 18 and adapted to reciprocate within the sleeve 18 by rotating the screw 20. A plurality of screw threads 26 are defined in a bore 28 of the U-shaped portion and aligned with an axis of the screw 20, the screw 20 inserted through the plurality of screw threads 26 defined in the bore 28 of the U-shaped portion such that the rotation of the screw 20 causes a reciprocation of the first arm 12 and the second arm 14 within the sleeve 18 of the gear withdrawal tool 10.

[0005] Figure 1 illustrates a gear withdrawal tool 10 for withdrawing a gear of a high pressure fuel pump. The gear withdrawal tool 10 comprises a first arm 12 that comprises an L-shaped portion. The gear withdrawal tool 10 further comprises a second arm 14 that comprises a U-shaped portion. In the exemplary embodiment, the first arm 12 of the gear withdrawal tool 10 is secured to the second arm 14 of the gear withdrawal tool 10 by means of a pivot screw 16. Therefore, when a shaft of a high pressure fuel pump is gripped between the first arm 12 of the gear withdrawal tool 10 and the second arm 14 of the gear withdrawal tool 10, the first arm 12 of the gear withdrawal tool 10 is rotated away from the second arm 14 of the gear withdrawal tool 10 about the pivot screw 16 to expand the diameter of the opening between the first arm 12 of the gear pivotal tool 10 and the second arm 14 of the gear pivotal tool 10. Similarly, when the shaft of the high pressure fuel pump is released from between the first arm 12 of the gear withdrawal tool 10 and the second arm 14 of the gear withdrawal tool 10, the first arm 12 of the gear withdrawal tool 10 is rotated towards the second arm 14 of the gear withdrawal tool 10 to ensure that the diameter of the opening between the first arm 12 of the gear withdrawal tool 10 and the second arm 14 of the gear withdrawal tool 10 contracts to the original diameter as before.

[0006] In an exemplary embodiment, a bore 28 is defined in the U-shaped portion in the second arm 14 of the gear withdrawal tool 10. The bore 28 that is defined in the U-shaped portion in the second arm 14 of the gear withdrawal tool 10 includes a plurality of screw threads 26 that are adapted to be inserted through a screw 20 of the gear withdrawal tool 10. More specifically, a sleeve 18 is adapted to be inserted through the first arm 12 and the second arm 14 of the gear withdrawal tool 10. The sleeve 18 is adapted to prevent the first arm 12 and the second arm 14 from moving away from each other when a shaft of the high pressure fuel pump is secured between the first arm 12 and the second arm 14 respectively. Therefore, when the first arm 12 and the second arm 14 are inserted within the sleeve 18, the inner sidewall of the sleeve 18 prevents the first arm 12 and the second arm 14 from moving away from each other, thereby expanding the diameter of the bore between the first arm 12 and the second arm 14 when a shaft of the high pressure fuel pump is secured between the first arm 12 and the second arm 14 respectively.

[0007] A screw 20 comprising a plurality of screw threads 22 is defined on the screw 20. More specifically, the screw 20 comprising a plurality of screw threads 22 is inserted and secured to a plurality of mating screw threads 24 that is defined on the sleeve 18. The first arm 12 and the second arm 14 are adapted to reciprocate within the sleeve 18 by rotating the screw 20. A plurality of screw threads 26 are defined in a bore 28 of the U-shaped portion. When the first arm 12 and the second arm 14 are aligned with an axis of the screw 20, the screw 20 is inserted through the plurality of screw threads 26 defined in the bore 28 of the U-shaped portion such that the rotation of the screw 20 causes a reciprocation of the first arm 12 and the second arm 14 within the sleeve 18 of the gear withdrawal tool 10. More specifically, the rotation of the screw 20 causes the penetration of the screw 20 within the bore 28 of the U-shaped portion. The penetration of the screw 20 within the bore 28 of the U-shaped portion causes the translation of the first arm 12 and the second arm 14 within the sleeve 18 of the gear withdrawal tool 10. Therefore, the shaft of the high pressure fuel pump that is secured between the first arm 12 and the second arm 14 of the gear withdrawal tool 10 also translates, thereby extracting the gear that is secured to the shaft of the high pressure fuel pump. Once the gear has been successfully extracted, the screw 20 is rotated that causes the translation of the first arm 12 and the second arm 14 away from the sleeve of the gear withdrawal tool 20. The first arm 12 and the second arm 14 are then priced apart from each other about the pivot screw 16. Therefore, the shaft that is secured between the first arm 12 and the second arm 14 can be withdrawn away from the first arm 12 and the second arm 14. The gear withdrawal tool 10 can be used once more to withdraw any gear that is secured to a shaft of a mechanical component and is not merely restricted to withdrawing a shaft of a high pressure fuel pump.

[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.