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Pump tappet

A technology for pumps and rollers, applied in the field of pump tappets, can solve the problems of poor end lubrication of roller bearings and wear of outer ring 108, etc.

Inactive Publication Date: 2011-04-20
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lateral movement of such roller bearings, between the outer ring 108 and the housing (push rod housing 102 ), the ends of the roller bearings are poorly lubricated, and there is a concern that the outer ring 108 is worn.

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0079] Embodiments of the present invention will be described below with reference to the drawings. figure 1 It is a cross-sectional view showing part of a high-pressure pump including a pump tappet (hereinafter simply referred to as a "tappet") according to an embodiment of the present invention. figure 2 as well as image 3 yes figure 1 Cutaway view of a lifter included in the high pressure pump shown. Figure 4 yes figure 2 as well as image 3 A schematic perspective view of the lifter shown. Figure 5 From Figure 4 View in the direction of the arrow V Figure 4 A diagram of the tappet is shown. Figure 6 From Figure 4 View in the direction of the arrow VI Figure 4 A diagram of the tappet is shown. Figure 7 From Figure 4 View in the direction of the arrow VII Figure 4 A diagram of the tappet is shown. Figure 8 From Figure 4 View in the direction of arrow VIII in Figure 4 A diagram of the tappet is shown. and, figure 2 equivalent to Figure 5 ...

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Abstract

A pump tappet (21) transmits a rotational motion of a camshaft (12), having a cam (12a) formed thereon, to a pump plunger (13) in the form of a reciprocating rectilinear motion and performs a reciprocating rectilinear motion together with the pump plunger (13). The pump tappet (21) includes a shaft (22), a roller bearing (31) mounted to the outer diameter side of the shaft (22) and rotatably supported on the shaft (22), and a case (23) for housing the shaft (22) and the roller bearing (31). The roller bearing (31) is provided with an outer ring (32) making contact with the cam (12a), rollers (33) arranged between the outer ring (32) and the shaft (22), and a retainer (34) for retaining the rollers (33).

Description

technical field [0001] The invention relates to a pump tappet, in particular to a pump tappet containing a roller bearing. Background technique [0002] An engine of an automobile or the like has a high-pressure pump that injects fuel at high pressure. The high-pressure pump converts the rotary motion of the camshaft with the cam into the reciprocating linear motion of the pump plunger, and uses the reciprocating linear motion of the pump plunger to feed gas, pressurize it in the high-pressure chamber, and inject it into the fuel chamber to supply fuel. As a component of the high-pressure pump, there is a pump tappet that converts the rotational motion of the camshaft into a reciprocating linear motion and transmits it to the pump plunger. Depending on the shape of the contact portion with the cam, etc., there are various types of pump tappets such as roller tappets including rollers and mushroom tappets. [0003] Here, a technology related to a pump tappet including a rol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B9/04F02M59/10F16C19/26F16C33/34F16C33/64F16C33/66
CPCF16C33/64F16C19/26F01L2105/02F16C33/34F04B1/0439F02M59/102F16C33/6681F01L1/143F02M2200/8015F16C2360/18F01L2305/02F01L2307/00Y10T74/2107
Inventor 大石真司片冈雅彦阿部克史
Owner NTN CORP
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