Multi-linear diesel engine oil pump cam

Abstract

The utility model discloses a multi-linear diesel engine oil pump cam which comprises a cam body and a linear profile, the linear profile is formed on the cam body, the cam body is located at the lower end of a rolling wheel assembly or a flat plate assembly, and the linear profile sequentially comprises a base circle section, a working section and a descending section. The working section internally comprises a linear ascending section, an arc ascending section and an arc deceleration section in sequence, the arc deceleration section is a convex arc, the sum of the arc lengths of the linear ascending section and the arc ascending section is larger than that of the arc deceleration section, and the linear ascending section and the arc ascending section are used for ensuring that the oil sprayer has enough working pressure; the fuel oil supply system solves the problems that when injection of an existing fuel oil supply system is finished, the instantaneous combustion temperature is high, and gas pollutants are prone to being generated, the outwards-protruding arc deceleration section is formed in the working section, oil supply pressure generated in the oil supply process of an oil pump is instantaneously reduced, oil supply is paused, the instantaneous combustion temperature and pressure are further reduced, and the fuel oil supply efficiency is improved. And the generation of gas pollutants is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cams, in particular to a multi-line diesel engine oil pump cam. Background Art

[0002] At present, diesel engine power generally adopts the optimization of the fuel pump's fuel supply working section as one of the technologies to increase the fuel injection pressure. Under the action of the fuel pump cam working section, the fuel injection pressure increases sharply, and the instantaneous combustion temperature of the diesel engine increases sharply after the fuel supply ends, which is very easy to produce gaseous pollutants. Utility Model Content

[0003] The utility model aims to provide a multi-line diesel engine oil pump cam, which forms an arc deceleration section in the working section of the cam to reduce the instantaneous injection pressure during the fuel supply injection, thereby generating secondary or multiple injections to reduce the instantaneous combustion temperature and reduce the generation of gaseous pollutants.

[0004] The utility model provides the following technical scheme: a multi-line diesel engine oil pump cam, comprising a cam body and a linear profile, wherein the linear profile is formed on the cam body, the cam body is located at the lower end of a roller assembly or a flat plate assembly, the linear profile sequentially comprises a base circle segment, a working segment and a descending segment, the working segment sequentially comprises a straight rising segment, an arc rising segment and an arc deceleration segment, the arc deceleration segment is an outwardly convex arc, the sum of the arc lengths of the straight rising segment and the arc rising segment is greater than the arc length of the arc deceleration segment, and is used to ensure that the injector has sufficient working pressure.

[0005] Furthermore, the circular arc ascending section and the circular arc deceleration section are symmetrically arranged, so that the circular arc deceleration section can reduce acceleration.

[0006] Furthermore, the descending section includes a maximum lift section and a transition arc section, the maximum lift section is located at one end of the working section, and the transition arc section is located at one end of the base circle section.

[0007] Furthermore, the maximum lift section includes a first lift section and a second lift section, the first lift section is located at one end of the working section, the second lift section is located at one end of the transition arc section, and the second lift section and the base circle section are concentric arcs.

[0008] Furthermore, the transition arc segment is semicircular.

[0009] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0010] (1) By forming an outward convex arc in the working section of the oil pump cam, the instantaneous pressure during the cam oil supply process is reduced, so that secondary or multiple injections are generated during the injection period, the instantaneous combustion temperature and pressure are reduced, and the generation of gas pollutants is reduced;

[0011] (2) The sum of the arc lengths of the straight rising section and the arc rising section is greater than the arc length of the arc deceleration section, so that the oil pump pressure reaches the working pressure, ensuring the stable operation of the injector. When the pressure in the arc deceleration section decreases, the pressure can also ensure the normal operation of the injector. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the oil pump cam structure of the utility model;

[0015] In the figure: 1, oil pump plunger; 2, roller assembly or flat plate assembly; 3, oil pump cam; 31, base circle segment; 32, working segment; 321, straight rise segment; 322, arc rise segment; 323, arc deceleration segment; 33, descending segment; 331, maximum lift segment; 3311, first lift segment; 3312, second lift segment; 332, transition arc segment. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0017] See also Figure 1 and Figure 2The utility model provides a technical solution: a multi-line diesel engine oil pump cam, including a cam body and a linear profile, the linear profile is formed on the cam body, the cam body is located, the cam body is located at the lower end of the roller assembly or the plate assembly 2, the linear profile includes a base circle segment 31, a working segment 32 and a descending segment 33 in sequence, the working segment 32 includes a straight rising segment 321, an arc rising segment 322 and an arc deceleration segment 323 in sequence, the arc deceleration segment 323 is an outwardly convex arc, the arc length of the straight rising segment 321 and the arc rising segment 322 is greater than the arc length of the arc deceleration segment 323, which is used to ensure that the injector has sufficient working pressure, the roller assembly or the plate assembly 2 performs an up and down plunger movement along the linear profile in the oil pump plunger 1, the roller assembly or the plate assembly 2 starts from the base circle segment 31, and when passing through the straight rising segment 321, the plunger rises, the arc rising segment 322 provides acceleration for the plunger to rise and enhances the injection pressure, and then When the roller assembly or the flat plate assembly 2 passes through the arc deceleration section 323, the roller assembly or the flat plate assembly 2 will pause momentarily at the transition arc junction connecting the arc deceleration section 323 and the maximum lift section 31, and the upward acceleration of the roller assembly and the flat plate assembly 2 will change, thereby reducing the acceleration of the upward movement of the roller assembly or the flat plate assembly 2 and reducing the instantaneous injection pressure. After the injection pressure is reduced, the pressure can still enable the injector to work stably, and then the roller assembly or the flat plate assembly 2 continues to rise. When the roller assembly or the flat plate assembly 2 is located at the maximum lift 331, the rising acceleration of the roller assembly 2 or the flat plate assembly is close to 0. By forming the convex arc-shaped arc deceleration section 323 in the working section 32, the running acceleration of the roller assembly or the flat plate assembly 2 in the working section 32 is slowed down, the instantaneous pressure of the cam oil supply is reduced, and secondary or multiple injections are generated during the injection period, thereby reducing the instantaneous combustion temperature and the generation of gaseous pollutants.

[0018] The arc ascending section 322 and the arc deceleration section 323 are symmetrically arranged, so that the roller assembly or the plate assembly 2 on the arc deceleration section 323 is in a decelerated motion, and the proportion of the working section 32 is small, so that the oil pump plunger 1 completes the upward movement in a very short time, thereby ensuring the oil supply pressure in the oil pump.

[0019] The descending section 33 includes a maximum lift section 331 and a transition arc section 332. The maximum lift section 331 is located next to the end of the arc deceleration section 323, and the transition arc section 332 is located next to the base circle section 31. When the roller assembly or the plate assembly 2 passes through the maximum lift section 331, the oil pump plunger 1 is located at the top dead center.

[0020] The maximum lift section 331 includes a first lift section 3311 and a second lift section 3312 . The first lift section 3311 is located at one end of the working section 32 , and the second lift section 3312 is located at one end of the transition arc section 332 . The second lift section 3312 and the base circle section 31 are concentric arcs.

[0021] The transition arc segment 332 is semicircular, and the transition arc end 332 occupies a large area, which further prolongs the oil return time of the oil pump, thereby ensuring the pressure in the oil pump.

[0022] Working process: the roller assembly or the plate assembly moves against the rotating oil pump cam, moves to the working section and starts to supply oil, passes through the straight rising section and the arc rising section, provides the oil supply pressure, and when moving to the arc deceleration section, the roller of the wheel assembly or the plate of the plate assembly has an instantaneous change in movement direction, the oil supply pressure will drop instantaneously, the oil supply will also be paused instantaneously, and then the plunger continues to move along the cam to the end of the working section; when the injection pressure is instantly reduced, secondary or multiple injections are generated in the oil supply process, which reduces the instantaneous combustion temperature and pressure and reduces the generation of gaseous pollutants.

[0023] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A multi-line diesel engine oil pump cam, comprising a cam body and a line profile, wherein the line profile is formed on the cam body, and the cam body is located at the lower end of a roller assembly or a plate assembly, characterized in that: The linear profile includes a base circle section, a working section and a descending section in sequence. The working section includes a straight rising section, an arc rising section and an arc deceleration section in sequence. The arc deceleration section is an outwardly convex arc. The sum of the arc lengths of the straight rising section and the arc rising section is greater than the arc length of the arc deceleration section, so as to ensure that the injector has sufficient working pressure.

2. A multi-line diesel engine oil pump cam according to claim 1, characterized in that: The circular arc ascending section and the circular arc decelerating section are symmetrically arranged.

3. The multi-line diesel engine oil pump cam according to claim 1, characterized in that: The descending section comprises a maximum lift section and a transition arc section, wherein the maximum lift section is located at one end of the working section, and the transition arc section is located at one end of the base circle section.

4. A multi-line diesel engine oil pump cam according to claim 3, characterized in that: The maximum lift section includes a first lift section and a second lift section, the first lift section is located at one end of the working section, the second lift section is located at one end of the transition arc section, and the second lift section and the base circle section are concentric arcs.

5. The multi-line diesel engine oil pump cam according to claim 3, characterized in that: The transition arc segment is semicircular.

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