JP3732072B2 - Fuel injection pump test equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuel injection pump test apparatus used in an off-line test for measuring an injection amount of a fuel injection pump installed in a diesel engine.
[0002]
[Prior art]
In the above-described offline test apparatus, a diesel engine is mounted on a test platform, and fuel oil is introduced from the diesel engine to the test apparatus side on the platform side. While attaching the first connector and connecting the second connector provided at the inlet portion of the supply pipe supplied to the fuel injection nozzle, a spanner or the like with the second connector addressed to the first connector The work form of screwing in using an appropriate manual tool was adopted.
[0003]
[Problems to be solved by the invention]
When the work form as described above is adopted, if the number of connecting parts such as a multi-cylinder engine increases, the work burden on the operator is heavy, and even after tightening and mounting, the connection is made by the injection pressure during the test due to the looseness of the screw part There were inconveniences such as fuel oil leaking from the part.
[0004]
An object of the present invention is to provide a fuel injection pump test apparatus capable of reducing the work load and preventing a fuel oil leakage phenomenon during a test.
[0005]
[Means for Solving the Problems]
(Structure) The invention according to claim 1 is provided with a holder for mounting a fuel injection nozzle on a test platform, a test diesel engine is installed on the platform, and an engine fuel injection pump in the diesel engine A connector for connecting a fuel discharge port for discharging fuel and the fuel injection nozzle is provided, and the connector is composed of a first connector and a second connector that are detachable from each other, and the fuel outlet The first connector is attached to the fuel inlet of the fuel injection nozzle, and the second connector is attached to the first connector in the connecting direction to complete the connection. A clamp device for maintaining the state is provided in the holder,
The clamp device comprises a cam mechanism that pushes and moves the second connector, and a fluid pressure cylinder that drives the cam mechanism,
A flexible mechanism for giving a degree of freedom, in which the clamp device can move freely in the XY direction perpendicular to the Z direction as well as the Z direction along the connection direction to the first connection tool together with the second connection tool. In the holder,
The accommodation mechanism is composed of a first accommodation mechanism that gives a degree of freedom in the XY direction and a second accommodation mechanism that gives a degree of freedom in the Z direction, and the first accommodation mechanism is parallel to each other, and the holder is attached to the tip. The four support rods and spherical bearings that support the distal end portion and the proximal end portion of the support rod, and the second interchange mechanism is composed of a balance cylinder that takes a weight balance with respect to the clamp device. The effects are as follows.
[0006]
(Effect) That is, the clamp device is operated by bringing the second connector provided in the holder provided in the platform close to the first connector of the diesel engine installed at a predetermined position of the platform for the test. Then, the clamp device pushes in the second connection tool, and connects the second connection tool to the first connection tool. The clamp device is used for the connection work of the connection tool as described above, but not only works at the time of connection, but also holds the state where the second connection tool is connected to the first connection tool. When the test is conducted with the flow of the fuel, the connection portion does not loosen even if a high pressure is applied to the connection portion, and the leakage of fuel can be suppressed.
Furthermore, even when the engine is of a multi-cylinder type and has a connector for each cylinder, since the connection is made using the clamp device, a plurality of connectors can be connected simultaneously, Labor saving can be achieved.
In addition, since the cam mechanism is used, the moving speed of the second connecting tool at the time of connection can be made freely and loose and flexible so that reliable and stable operation can be expected. In the connection tool, it was possible to obtain a clamping device that can cope with a short stroke required for connection .
In addition, since the clamping device is provided with an accommodation mechanism that can freely move in the XYZ directions, the first connection of the second connector is made when the second connector is moved and pushed into the first connector by the clamp device. Even if there is misalignment or inclination of the fixture, the interchange mechanism can function and automatically correct it, so that an unreasonable load does not act on the connector and smooth connection work is done without damaging the connector. Can do .
In addition, since spherical bearings are used, the degree of freedom in the XY directions becomes smoother, and the spring biasing force acts as a resistance to movement as seen when the spring is used as an accommodation mechanism. In other words, the flexibility of the clamping device that can move flexibly can be increased. In addition, in the Z direction, the weight balance of the clamp device is achieved using a cylinder, so that the clamp device can be raised and lowered artificially and lightly, and the second connection before the push operation is performed by the clamp device. The tool can be manually operated to the connection start position for the first connection tool, and a fully automatic connection method can be considered by moving the holder and only moving the machine. By adopting a simple connection structure for performing an artificial operation, it is possible to simplify the structure of the device related to the connection .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, a diesel engine 1 is mounted on a test platform 2, and a fuel test device 3 that supports a test injection nozzle 22 is provided at the rear end of the platform 2. The diesel engine 1 incorporates a fuel injection pump 4 to be tested, and as shown in FIG. 8, a crankshaft and an electric motor 5 are spline-coupled to drive the engine 1, and the electric motor 5 The fuel injection pump 4 is driven by driving the camshaft from the shaft. A torque meter 6 is interposed between the electric motor 5 and the engine 1. 8 shows a state where the crankshaft of the engine 1 and the output shaft of the electric motor 5 are separated from each other. During the test, the mounting base on which the engine 1 is mounted is slid by the electric cylinder 43. Thus, the output shaft of the electric motor 5 is inserted into the crankshaft, the crankshaft and the output shaft are spline-coupled, and the engine 1 is driven by the electric motor 5.
[0014]
Next, the structure of the fuel test apparatus 3 will be described. As shown in FIGS. 1 and 3, the column 8 is erected from the platform 2, the bracket 9 is raised obliquely upward from the tip of the column 8, and the round bar frame 10 is placed above the engine 1 from the upper end of the bracket 9. It extends forward so that it is located.
A guide frame 11 that is fastened and fixed with bolts is attached to the tip of the round bar-shaped frame 10, and a holder 12 that supports the fuel injection nozzle 22 is slidably supported on the guide frame 11.
[0015]
The holder 12 will be described. As shown in FIG. 4, the holder 12 supports the guide frame 11 with a pair of front and rear slide rods 13 and 13 slidably movable in the left and right directions perpendicular to the axis of the round bar frame 10. Block-shaped upper side frames 14 and 14 are attached and fixed to the left and right ends of the slide rods 13 and 13, respectively.
As shown in FIGS. 2 and 4, a pair of front and rear support rods 15, 15, 15, 15 are supported by the left and right upper side frames 14, 14 so as to be lowered, and the support rods 15, 15, 15 are supported. , 15 have lower side frames 16, 16 attached to the lower ends thereof. A total of 8 between the left and right upper side frames 14, 14 and the upper ends of the support rods 15, 15, 15, 15 and between the lower side frames 16, 16 and the lower ends of the support rods 15, 15. A spherical bearing 17 is interposed at each location, and the lower side frames 16 and 16 are configured to have a degree of freedom in the left-right direction (X direction) and the front-rear direction (Y direction). The upper and lower side frames 14 and 16 and the support rod 15 are referred to as a first accommodation mechanism B.
[0016]
As shown in FIGS. 2 and 4, a connecting rod 18 is installed over the left and right lower side frames 16, 16, and the connecting rod 18 is positioned inside the left and right lower side frames 16, 16. On the other hand, support frames 19 and 19 are provided that are fastened and fixed with bolts so as to be swingable around the axis of the connecting rod 18. Pneumatic balance cylinders 20 and 20 are attached to the support frames 19 and 19, respectively. The cylinder rod 20A of the balance cylinder 20 extends downward, and the downward tips of the cylinder rods 20A of the left and right balance cylinders 20 and 20 are attached. A mounting frame 21 is erected between them.
[0017]
As shown in FIGS. 2 and 4, left and right receiving frames 23, 23 are provided at the left and right ends of the mounting frame 21, and a fuel pipe 29 connected to the fuel injection nozzle 22 is attached to the left and right receiving frames 23, 23. Below the frames 23, 23, clamp devices 25, 25, 25 for connecting tools 24, 24, 24 described later are provided.
[0018]
Next, the clamp device 25 will be described. As shown in FIGS. 5 and 6, a cylinder block 26 is disposed below the receiving frame 23, and the cylinder block 26 is supported by being suspended from the receiving frame 23, and the piston slides in the cylinder block 26 in the front-rear direction. 27 is stored. A cam surface 27A is formed on the downward surface of the piston 27, and a receiving cam body 28 having a cam surface 28A pressed by the cam surface 27A and driven to move downward is housed in the cylinder block 26. . The piston 27 and the receiving cam body 28 are formed in a state where a hole portion 27B and a hole portion 28B penetrating vertically are communicated, and fuel from the fuel injection pump 4 is formed in the hole portion 27B and the hole portion 28B. A fuel pipe 29 for guiding oil to the injection nozzle 22 is inserted. The protruding end of the fuel pipe 29 that protrudes downward from the lower end of the receiving cam body 28 is a bowl-shaped surface that can be in close contact with the dish-shaped contact surface of the first connector 24A provided at the discharge port 4A of the injection pump 4 described later. Is formed. The piston 27 and the receiving cam body 28 constitute a cam mechanism. The piston 27 and the cylinder block 26 constitute a hydraulic cylinder.
[0019]
As shown in FIGS. 5 and 6, a cylindrical engagement body 31 is connected to the lower end of the receiving cam body 28 via a spring 30, and through holes are provided at a plurality of circumferential positions at intermediate positions of the cylindrical engagement body 31. 31A is provided, and a ball body 32 for engaging and fixing is provided at a position corresponding to the through hole 31A. A cylindrical case 24 c is disposed below the cylinder block 26 that houses the receiving cam body 28, and the cylindrical case 24 c is fixed to the lower plate 26 B of the cylinder block 26 with a flange. An internal space for holding the ball body 32 is formed in the cylindrical case 24c, an annular groove 24d having a diameter larger than the inner diameter on the outlet side is formed in the internal space, and a small-diameter inner peripheral surface other than the annular groove 24d. The inner diameter of 26B is formed to be an inner diameter that is in close contact with the outer peripheral surface of the cylindrical engagement body 31. A cylindrical connector 24 c, a receiving cam body 28, a cylindrical engagement body 31, a ball body 32, and a spring 30 form a second connector 24 </ b> B at the lower end of the cylinder block 26. As shown in FIGS. 5 and 6, the first connector 24 </ b> A provided in the discharge port 4 </ b> A that discharges the fuel from the injection pump 4 has a ring body 24 a that is used only for the test screwed and fixed. A recessed annular groove 24b is formed on the outer peripheral surface of the upper end portion of the ring body 24a.
[0020]
On the other hand, as shown in FIGS. 2 and 5, the upper plate 26 </ b> A of the cylinder block 26 is connected and fixed by left and right connecting members 33, 33 suspended from the receiving frame 23, and drives the piston 27 to the cylinder block 26. In order to supply the hydraulic oil, an oil passage 33A for supplying the hydraulic oil for driving the piston 27 is formed in the left and right couplers 33 and 33, and this is performed through the oil passage 33A. Therefore, as shown in FIG. 5, when hydraulic oil is introduced from the left coupling tool 33, the piston 27 does not move to the right and the receiving cam body 28 is not pushed down, and the connection tool 24 is not connected. . As shown in FIG. 6, when hydraulic oil is introduced from the right side connector 33, the piston 27 moves to the left, the receiving cam body 28 is pushed down by the cam surfaces 27A and 28A, and the tip of the receiving cam body 28 protrudes. , Coupled to the ring body 24a of the first connector 24A. In this case, the ball body 32 enters the recessed annular groove 24 b of the ring body 24 a and the engaged state is maintained by the spring 30.
[0021]
The oil supply path to the piston 27 will be described. As shown in FIG. 2, a supply pipe 34 that is also used as a support frame is connected to the rear end portion of the receiving frame 23, and the supply pipe 34 is raised and an oil passage block 35 is attached to the upper end portion. The oil passage block 35 is supplied to the supply pipe 34 with the fuel injection nozzle 22 and the discharge pipe (or hose) 36 for guiding the test fuel oil from the fuel injection nozzle 22 to the discharge side and the hydraulic oil for driving the piston 27. A supply pipe (or hose) 37 is connected. As described above, the fuel pipe 29 is connected to the fuel injection nozzle 22, and the end of the fuel pipe 29 opposite to the fuel injection nozzle mounting side penetrates the receiving frame 23 and the cylinder block 26, It extends to the front end of the receiving cam body 28, and as described above, the front end is formed into a bowl-shaped surface that is in close contact with the front end surface of the mating first connection tool 24A.
[0022]
As shown in FIG. 4, three sets of connecting devices 24 are provided, and each connecting device 24 is equipped with a clamp device 25, a fuel pipe 29, an oil passage block 35, a supply pipe 34, and a discharge pipe 36, respectively. These are integrally attached to the receiving frame 23 and the mounting frame 21. The left and right receiving frames 23 and 23 are respectively provided with handle portions 38 for manual operation. When connecting the connection tool 24, the left and right handle portions 38 shown in FIGS. It can be moved in the left-right direction or the up-down direction, and when pressed lightly, as shown in FIG. 3, the clamp device 25, the fuel pipe 29, the oil passage block 35, the supply pipe 37, and the discharge pipe 36 are integrated. The second connector 24B can be fitted to the first connector 24A. Note that the clamp device 25 and the like can be moved up and down integrally by operating the handle portion 38, which is because the balance is set by the air pressure of the balance cylinder 20. The weight is balanced so that the clamp device 25 and the like can be stopped at that position even if the hand is released from the handle portion 38 after the movement. In this way, the balance cylinder 20 is referred to as a second interchange mechanism C that ensures a degree of freedom in which the clamp device 25 is allowed to move in the vertical direction (Z direction).
[0023]
In the above configuration, as shown in FIG. 7, an operation switch for supplying pressure oil to the clamp device 25 is provided. This switch is referred to as a connection switch 39 and is clamped by the control valve 41 via the control device 40. The device 25 is driven. When the connection is completed by the clamp device 25, the start switch 42 is operated to start the electric motor 5, and the injection amount injected from the fuel injection nozzle 22 is measured.
[0024]
The test procedure is as follows.
(1) The ring body 24a is screwed into the discharge port 4A of the fuel injection pump 4 to install the engine 1 at a predetermined position on the platform 2.
(2) Grasp the left and right handle portions 38, 38 to lower the clamp device 25 and the like, and cover the ring body 24a with the cylindrical case 24c provided at the lower end of the cylinder block 26. If there is a large misalignment between the left and right when covering, rough alignment can be performed by operating the handle portions 38, 38 to move left and right. When the rough alignment is completed, the clamping device 25 can be displaced forward, backward, left, right, up and down (so-called XYZ directions) with respect to the holder 12 by the first accommodation mechanism B and the second accommodation mechanism C, so that the cylindrical case 24c Since the cylindrical case 24c is in a state along the ring body 24a even when the ring body 24a is pushed in, the second connecting tool 24B on the clamp device 25 side can be easily connected to the ring body 24a. Can be attached to.
(3) Next, when the connection switch 39 is operated, pressure oil is supplied into the cylinder block 26 and the clamp device 25 is operated, and the receiving cam body 28 is pushed down by the piston 27 and engaged with the ring body 24a. The ball body 32 enters the recessed annular groove 24b to complete the engaged state, and this state is maintained by hydraulic pressure.
(4) When the connection is completed, the start switch 42 is operated and the fuel injection pump 4 is driven by the electric motor 5 to measure the injection amount.
[0025]
[Another embodiment]
The present invention can also be implemented in the following forms.
In the above embodiment, hydraulic pressure is used to drive the piston 27 of the clamping device 25, but other working medium such as air may be used.
[Brief description of the drawings]
FIG. 1 is a side view of the entire test apparatus. FIG. 2 is a longitudinal side view of a clamp device and a holder. FIG. 3 is a side view of a state in which the clamp device is lowered and connected. FIG. 5 is a front side view showing a clamp device. FIG. 6 is a vertical side view showing the clamp device. FIG. 7 is a control block diagram. FIG. Overall front view [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Diesel engine 2 Platform 4 Fuel pump 12 Holder 15 Support rod 17 Spherical bearing 20 Balance cylinder 22 Fuel injection nozzle 24 Connector 24A 1st connector 24B 2nd connector 25 Clamping device B 1st accommodation mechanism C 2nd accommodation mechanism

Claims (1)

A holder for mounting a fuel injection nozzle is provided on the test platform, a test diesel engine is installed on the platform, and a fuel discharge port for discharging fuel from an engine fuel injection pump in the diesel engine and the fuel injection A connector for connecting to the nozzle; and the connector is composed of a first connector and a second connector which are detachable from each other, and the first connector is connected to the fuel discharge port. The holder is provided with a clamp device that attaches the second connector to the fuel receiving port of the nozzle, and pushes and moves the second connector in the connection direction with respect to the first connector to maintain the connection completion state. ,
The clamp device comprises a cam mechanism that pushes and moves the second connector, and a fluid pressure cylinder that drives the cam mechanism,
A flexible mechanism for giving a degree of freedom, in which the clamp device can move freely in the XY direction perpendicular to the Z direction as well as the Z direction along the connection direction to the first connection tool together with the second connection tool. In the holder,
The accommodation mechanism is composed of a first accommodation mechanism that gives a degree of freedom in the XY direction and a second accommodation mechanism that gives a degree of freedom in the Z direction, and the first accommodation mechanism is parallel to each other, and the holder is attached to the tip. The four support rods and the spherical bearings that support the front end and the base end of the support rods, and the second interchange mechanism is a fuel comprising a balance cylinder that balances the weight with respect to the clamp device. Injection pump test equipment .

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