JP2019190412A - Pump device - Google Patents

Abstract

To make external piping to be less likely to be gripped.SOLUTION: A pump device 1 includes: a housing 10; external piping 16 of which one end and the other end are connected to the housing 10; and a projection member 18 for reducing a gap between an external surface 10a of the housing and an intermediate part of the external piping 16.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a pump device that sucks and discharges fluid.

  2. Description of the Related Art Conventionally, as a pump mounted on a vehicle, a supply pump that adjusts and pressurizes the flow rate of sucked fuel and discharges the fuel to the internal combustion engine side is known. Some of such supply pumps are provided with a curved or bent external pipe outside the casing (see, for example, Patent Document 1).

JP 2007-139098 A

  For example, when the above-described external piping is gripped by an operator during maintenance of the supply pump, a load may be applied to a connection portion between the external piping and the housing. Thereby, there exists a possibility that a connection part may be damaged and a fuel may leak.

  An object of the present disclosure is to provide a pump device that can make it difficult to grip external piping.

  A pump device according to an aspect of the present disclosure includes a casing, an external pipe having one end and the other end connected to the casing, and a gap between an outer surface of the casing and an intermediate portion of the external pipe. And a projecting member to be reduced.

  The pump device of the present disclosure can make it difficult to grip external piping.

The figure which shows the external appearance of the pump apparatus which concerns on embodiment of this indication The figure which shows typically the internal structure of the pump apparatus which concerns on embodiment of this indication. The figure which shows the external appearance of the pump apparatus which concerns on the modification 3 of this indication. The figure which shows the external appearance of the pump apparatus which concerns on the modification 4 of this indication.

  Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

  First, the configuration of the pump device 1 according to the embodiment of the present disclosure will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram illustrating an appearance of a pump device 1 according to the present embodiment. FIG. 2 is a diagram schematically showing the internal configuration of the pump device 1 according to the present embodiment.

  The pump device 1 is, for example, a supply pump that is mounted on a vehicle and supplies fuel to the internal combustion engine side. The arrows shown in FIGS. 1 and 2 indicate the flow of fuel.

  As shown in FIG. 1, the pump device 1 has a housing 10. One end of the suction pipe 11 and one end of the discharge pipe 12 are connected to the housing 10.

  The suction pipe 11 is a pipe through which the fuel sucked into the housing 10 flows. The other end of the suction pipe 11 is connected to, for example, a fuel tank (not shown) that stores fuel.

  The discharge pipe 12 is a pipe through which fuel discharged from the inside of the housing 10 flows. The other end of the discharge pipe 12 is connected to, for example, a common rail (not shown) that accumulates fuel.

  As shown in FIG. 1, the pump device 1 has an external pipe 16 provided outside the housing 10.

  The external pipe 16 communicates with the inside of the housing 10 via a first connection member 14 and a second connection member 15 that protrude from the outer surface of the housing 10.

  In each of the first connection member 14 and the second connection member 15, a through flow path penetrating in the longitudinal direction is formed.

  One end of the first connection member 14 is connected to a first flow path (not shown; details will be described later) formed inside the housing 10. The other end of the first connection member 14 is connected to one end of the external pipe 16.

  One end of the second connection member 15 is connected to a second flow path (not shown; details will be described later) formed inside the housing 10. The other end of the second connection member 15 is connected to the other end of the external pipe 16.

  Inside the housing 10, a flow rate adjustment valve 20, a high pressure pump 21, and a cam 22 shown in FIG.

  The flow rate adjustment valve 20 adjusts the flow rate of the fuel sucked from the suction pipe 11.

  The opening of the flow rate adjusting valve 20 is controlled by a control device (not shown) so that the pressure of the fuel stored in the common rail becomes a target common rail pressure determined based on the operating condition (for example, the rotational speed of the internal combustion engine and the accelerator opening). For example, it is controlled by an ECU (Electronic Control Unit).

  The fuel whose flow rate is adjusted by the flow rate adjusting valve 20 flows into the pressurizing chambers 24a and 24b.

  The high-pressure pump 21 pressurizes the fuel flowing into the pressurizing chambers 24a and 24b by reciprocating movement of the plungers 23a and 23b. The plungers 23a and 23b reciprocate with the rotation of the cam 22 of the camshaft 13 that is rotated by the driving force of the internal combustion engine.

  Although not shown, check valves are provided on the suction side and the discharge side of the pressurizing chambers 24a and 24b, respectively.

  The fuel pressurized in the pressurizing chamber 24a flows into the first flow path described above. Further, the fuel pressurized in the pressurizing chamber 24b flows into the second flow path described above.

  The downstream end of the second flow path is connected to the discharge pipe 12. The second flow path communicates with the through flow path of the second connecting member 15 described above.

  The fuel flow in the pump device 1 configured as described above is as follows.

  The fuel in the fuel tank is pumped up by a feed pump (not shown) and sucked into the housing 10 through the suction pipe 11.

  The fuel sucked into the housing 10 is adjusted to a high pressure in the pressurizing chambers 24 a and 24 b of the high-pressure pump 21 after the flow rate is adjusted by the flow rate adjusting valve 20.

  The fuel pressurized in the pressurizing chamber 24b flows into the second flow path described above and is supplied to the common rail via the discharge pipe 12.

  On the other hand, the fuel pressurized in the pressurizing chamber 24a flows into the first flow path, and then flows in the order of the through flow path of the first connection member 14, the external pipe 16, and the through flow path of the second connection member 15. It flows into the second flow path. That is, the fuel pressurized in the pressurizing chamber 24a merges with the fuel pressurized in the pressurizing chamber 24b in the second flow path. Then, the fuel that has flowed into the second flow path is supplied to the common rail via the discharge pipe 12. The fuel stored in the common rail is supplied to an injector (not shown) of the internal combustion engine, and is injected into the combustion chamber (not shown) by the injector.

  Next, the features of the pump device 1 of the present embodiment will be described below.

  As shown in FIG. 1, the pump device 1 has a protruding member 18.

  The protruding member 18 is a member that reduces a gap between the outer surface 10 a of the housing 10 and the intermediate portion of the external pipe 16. The protruding member 18 has, for example, a rectangular parallelepiped shape. Further, the protruding member 18 is a member that does not participate in the function of the pump device 1, for example.

  For example, the protruding member 18 is provided such that the distance C between the intermediate portion of the external pipe 16 and the protruding member 18 is smaller than the thickness of a human finger.

  Due to the above-described feature, there is no gap for human fingers to enter between the intermediate portion of the external pipe 16 and the housing 10, so that the external pipe 16 can be made difficult to grasp. Therefore, the load given to the connection part of the external piping 16 and the 1st connection member 14 or the 2nd connection member 15 can be prevented. Therefore, it is possible to prevent the connection portion from being damaged and the fuel from leaking out.

  It should be noted that the present disclosure is not limited to the above-described embodiment, and can be appropriately modified and implemented without departing from the spirit of the present disclosure. Hereinafter, each modification will be described.

[Modification 1]
In the embodiment, the case where the pump device 1 is a supply pump has been described as an example, but the type of the pump device 1 is not limited to this. For example, the pump device 1 may be a power steering pump that sucks and discharges oil.

[Modification 2]
In the embodiment, the case where the pump device 1 includes the two plungers 23a and 23b and the two pressurizing chambers 24a and 24b has been described as an example. However, the embodiment is not limited thereto, and the pump device 1 includes three or more pump devices 1. A plunger and a pressurizing chamber may be provided. For example, when the pump device 1 includes three plungers and a pressurizing chamber, two external pipes 16 are provided.

[Modification 3]
In the embodiment, the case where the pump device 1 includes one protruding member 18 has been described as an example. However, the present invention is not limited to this, and the pump device 1 may include a plurality of protruding members. For example, as shown in FIG. 3, the pump device 1 may include three projecting members 18 a to 18 c.

  The projecting members 18 a to 18 c are members that reduce the gap between the outer surface 10 a of the housing 10 and the intermediate portion of the external pipe 16, as in the projecting member 18 illustrated in FIG. 1. It is a member not involved in

  As shown in FIG. 3, the protruding members 18 a to 18 c have different lengths in the direction from the outer surface 10 a toward the intermediate portion of the external pipe 16.

  Thus, by providing a plurality of projecting members having different lengths, it is possible to eliminate a gap where a human finger enters between the external pipe 16 and the housing 10 regardless of the shape of the external pipe 16.

[Modification 4]
For example, as shown in FIG. 4, when a part 19 related to the function of the pump device 1 is provided between the housing 10 and the external pipe 16, a protruding member 18 d may be provided on the part 19. The component 19 may be, for example, a flow rate adjustment valve 20 or the like. Further, the component 19 may be a device.

  The projecting member 18 d is a member that reduces the gap between the outer surface 10 a of the housing 10 and the intermediate portion of the external pipe 16, as in the projecting member 18, and is a member that does not participate in the function of the pump device 1.

  In FIG. 4, it can be said that the outer surface of the component 19 is a part of the outer surface 10 a of the housing 10.

  In the above, each modification was demonstrated. In addition, each modification may be implemented in combination.

  The pump device of the present disclosure is useful for a pump device that sucks and discharges fluid.

DESCRIPTION OF SYMBOLS 1 Pump apparatus 10 Housing | casing 11 Intake piping 12 Discharge piping 13 Cam shaft 14 1st connection member 15 2nd connection member 16 External piping 18, 18a, 18b, 18c, 18d Protrusion member 19 Parts 20 Flow control valve 21 High pressure pump 22 Cam 23a, 23b Plunger 24a, 24b Pressurizing chamber

Claims (3)

A housing,
An external pipe having one end and the other end connected to the housing;
A protrusion member that reduces a gap between an outer surface of the housing and an intermediate portion of the external pipe,
Pump device. The protruding member is
Including a plurality of projecting members having different lengths in the direction from the outer surface of the housing toward the intermediate portion of the external pipe;
The pump device according to claim 1. A flow rate adjusting valve for adjusting the flow rate of the fuel sucked into the housing;
A high-pressure pump that pressurizes the fuel with the adjusted flow rate in a plurality of pressurizing chambers,
The fuel flows into the external pipe from one of the plurality of pressurizing chambers,
The fuel that has flowed out of the external pipe merges with the fuel that has flowed out of a pressurizing chamber other than the one pressurizing chamber among the plurality of pressurizing chambers.
The pump device according to claim 1 or 2.

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