Pump
A technology for pump chambers and hydraulic cylinders, which is applied to pump components, fuel injection pumps, variable displacement pump components, etc., and can solve problems such as hydraulic cylinder damage, stress amplitude fatigue damage, etc.
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no. 1 Embodiment approach
[0024] Next, a first embodiment of the present invention will be described. The pump of this embodiment is used as a fuel pump for supplying high-pressure fuel to a common rail system storing high-pressure fuel in a fuel injection device that injects fuel into a compression ignition internal combustion engine.
[0025] figure 1 This figure shows the structure of the pump according to the present embodiment. The pump casing 10 is formed with a cam chamber 10a located at the lower end side and a cylindrical slider insertion hole extending upward from the cam chamber 10a to the pump casing 10. 10b, and a cylindrical hydraulic cylinder insertion hole 10c extending from the slider insertion hole 10b to the upper end surface of the pump casing 10.
[0026] A camshaft 11 driven by a compression ignition internal combustion engine (hereinafter referred to as "internal combustion engine"), not shown, is arranged in the cam chamber 10 a , and the camshaft 11 is rotatably supported by ...
no. 2 Embodiment approach
[0046] Next, a second embodiment of the present invention will be described. Figure 4 (a) is a sectional view showing the main part of the pump hydraulic cylinder 13 according to the second embodiment, Figure 4 (b) is along Figure 4 The sectional view of line C-C of (a), Figure 4 (c) for Figure 4 (a) is a developed view of the inner peripheral surface of the hydraulic cylinder 13 . The range in which the recessed portion 13d is provided in this embodiment is different from that in the first embodiment. The same or equivalent parts as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0047] Such as Figure 4 As shown, when the axis J2 of the discharge passage 13c is inclined relative to the axis J1 of the hydraulic cylinder 13, the axis J1 of the hydraulic cylinder 13 will Particularly high stress occurs near the connecting portion on the side where the angle with the axis J2 of the discharge passage ...
no. 3 Embodiment approach
[0053] Next, a third embodiment of the present invention will be described. Figure 6 (a) is a sectional view showing the main part of the pump hydraulic cylinder 13 according to the third embodiment, Figure 6 (b) is along Figure 6 A sectional view of line E-E of (a), Figure 6 (c) is along Figure 6 (a) Cross-sectional view of line F-F. In this embodiment, the processing method of the recessed part 13d differs from 2nd Embodiment. The same or equivalent parts as those of the second embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0054] In the second embodiment, the concave portion 13d is processed into a spherical shape by electrolytic machining, but it may also be as follows: Figure 6 The recess 13d is machined into a cylindrical shape by milling as shown. Furthermore, in the pump of the first embodiment, the concave portion 13d may be processed into a cylindrical shape by milling.
[0055] (Other implementations) ...
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