JPH026343Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] The present invention detects the presence or absence of compression leakage in each cylinder by rotating an engine assembled in a factory using a drive device such as a motor and detecting the phase of the crankshaft. The present invention relates to a crankshaft phase detection device for easily confirming and identifying a cylinder when there is a compression leak.

[Structure of the idea]

In other words, the present invention provides a drive device, a connection member whose one end is connected to the drive device and has a groove formed on its outer periphery, and a connection member which is protruded from the other end surface of the connection member and which is connected to the engine crankshaft end surface. A first protrusion and a second protrusion that fit into a plurality of flywheel mounting bolt holes arranged at intervals and on the same circumference.
a protrusion, a third protrusion that protrudes from the other end surface and fits into one crankshaft processing reference hole formed at a specific position with respect to the crankshaft on the end surface of the crankshaft; and a third protrusion that is fixed to the connecting member. The gist of the invention is a crankshaft phase detection device characterized by having a pickup that generates a signal every time the groove passes near the groove.

[Effect of idea]

According to the above configuration, only one crankshaft processing reference hole is provided on the end face of the crankshaft, and its phase is always constant with respect to the crankshaft. They are connected at the corners. In addition, the pick-up measures the phase of the coupling device, and has extremely high measurement accuracy compared to a method that directly reads the phase of the crankshaft from the crankshaft. Furthermore, since the crankshaft processing reference holes are formed on the end face of the crankshaft, and the flywheel mounting bolt holes are also formed on the end face of the crankshaft, the first, second and third protrusions of the connecting member can be easily attached. It can be fitted into both of the above holes and has good fitting operability. Furthermore, by detecting the phase of the coupling device with a pick-up and detecting the phase of the crankshaft, for example, if the pressure inside the cylinder of an engine driven by the drive device is measured with a measuring device, the measured value can be correlated with the phase of the crankshaft. By doing so, it is possible to easily identify compression leaks in each cylinder and which cylinder is leaking.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail.

1 to 4, two rails 2 are provided on a base plate 1, and a slide base 4 is movably placed on the rails 2 via a slider 3. As shown in FIGS. The slide base 4 fixes a motor 5 and is connected to a rod 6' of a hydraulic cylinder 6 fixed on the base plate 1.
A pulse gear 7 is fixed to the output shaft of the motor 5,
A coupling ring 8 is connected to this pulse gear 7,
The connecting member 9 is fixed to the coupling ring 8.
The first pickup 10 is provided at the tip of a stay 11 provided on the motor 5, and generates an output every time a protrusion of the pulse gear 7 passes. As shown in FIG. 2, the connecting member 9 includes a flange portion 91 fixed to the coupling ring 8, a spline shaft 92 fixed to the flange portion 91, and a spline shaft 92 that engages with the spline shaft 92 so as to be movable in the left-right direction in FIG. a housing 93, a pin 95 planted in the flange portion 91 and inserted into a hole 94 provided in the housing 93, a pin 95 in the hole 94 and the housing 93;
It consists of a spring 96 interposed between the housing 93, three protrusions 97 formed on the right end surface of the housing 93, and one groove 98 formed on the outer periphery of the right end of the housing 93 and extending in the axial direction. The three protrusions 97 are erected as shown in FIG.
The flywheel mounting bolt hole 130 formed in the rear end surface of No. 3 and arranged in a regular pentagonal shape is fitted into the flywheel mounting bolt hole 130.
Both protrusions 97 are provided between the protrusion 97a and the second protrusion 97b.
The third protrusion 97c, which is arranged at an angle of 108 degrees with respect to a and 97b, is located on the same circumference as the mounting bolt hole 130 and in the center of the two mounting bolt holes 130. It fits into the shaft processing reference hole 131. Base plate 1
The support stand 14 fixed to the support base 14 has a proximity switch 15 and a second pick-up 16, and the proximity switch 15
generates a signal when the right end surface of the left large diameter portion 931 of the housing 93 is located in front of it. The second pickup 16 also generates a signal when the groove 98 of the housing 93 passes over its front surface. The engine 12 is carried in from the assembly process by a conveyor 17.

With the above structure, the engine 12 is conveyed by the conveyor 17 from the assembly process and stopped at the position shown in FIG. Next, the engine 12 is automatically fixed on the conveyor 17 by a positioning and fixing device (not shown). Then, this fixation is detected by the limit switch and the hydraulic cylinder 6 is actuated to move the rod 6' to the right in FIG. 1, and the motor 5 moves to the right on the rail 2. As a result of this movement, the projection 97 comes into contact with the rear end surface of the crankshaft 13, and at this time, the large diameter portion 931 of the housing 93 is positioned in front of the proximity switch 15. As a result, the proximity switch 15 generates a signal to stop the hydraulic cylinder 6, but since it takes time from the generation of the signal until the supply of oil to the hydraulic cylinder 6 is stopped, the motor 5 further moves to the right in FIG. . However, housing 9
3, the protrusion 97 is in contact with the rear end surface of the crankshaft 13 and is prevented from moving to the right, so the flange portion 91 is pressed against the spring 96.
move to the right against the reaction force. Then, the limit switch detects that the movement of the motor 5 has stopped, and the motor 5 is thereby started. When the motor 5 rotates and the third protrusion 97c faces the machining reference hole 131 of the crankshaft 13, the first and second protrusions 97a and 97b also face the flywheel mounting bolt hole 130, and the spring 96 causes the housing 93 to Since they are biased to the right in FIG. 1, the first to third protrusions 97a to 97c fit into the mounting bolt holes 130 and the machining reference holes 131, transmitting the rotational force of the motor 5 to the crankshaft 13, Rotate the crankshaft 13. The first pick-up 10 generates a signal every time the top of the pulse gear 7 passes, and this signal is counted by a measuring device to calculate the number of revolutions per minute.
The amount of electric power supplied to the motor 5 is controlled so that the motor 5 rotates at 300 rpm. Based on this amount of electric power, changes in the driving torque of the motor 5 and the average value of the torque are measured. Further, the magnetic flux of the second pickup 16 changes as the groove 98 of the housing 93 passes through its front surface, thereby generating a signal.

Next, after measuring the change in the driving torque, the motor 5 is automatically stopped, the hydraulic cylinder 6 is activated, and the rod 6' is moved to the left in FIG.
7 is detached from the crankshaft 13, and the motor 5
returns to the position shown in FIG. 1, and the hydraulic cylinder 6 stops. Then, the stop is detected by a limit switch, the engine 12 is released from being fixed by a positioning and fixing device (not shown), and the conveyor 17 is operated to transport the engine 12 to the next process.

Therefore, the first protrusion 97a is the third protrusion 97c.
Since it forms an angle of 108 degrees with the machining hole 131 in FIG. The second flywheel mounting bolt hole 13 clockwise from
0, and the third protrusion 97c fits into the machined hole 131, so the crank angle of the crankshaft 13 is always constant with respect to the connecting member 9, and the crank angle of the engine can be measured. Then,
Fluctuations in the drive torque according to the crank angle of the crankshaft 13 can be measured, so by attaching a pressure sensor to the ignition plug installation opening of each cylinder, you can check for compression leaks and correct them if they occur. Discrimination of cylinders, etc. can be easily achieved.

In the above embodiment, the motor 5 is used to drive the engine 12.
, but other driving devices may be used.

Further, in the above embodiment, the phase of the connecting member 9 is detected using magnetic flux, but light may also be used.
It may also be mechanical.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is an enlarged partial sectional view showing the connecting member 9 of FIG.
3 is a right side view of FIG. 2, and FIG. 4 is a front view showing the rear end surface of the crankshaft of the engine. 5...Motor, 6...Hydraulic cylinder, 7...Pulse gear, 9...Connection member, 10...First pick-up, 1
2...Engine, 13...Crankshaft, 15...
Proximity switch, 16...Second pick-up, 93...
Housing, 97...Protrusion, 130...Flywheel mounting bolt hole, 131...Crankshaft processing reference hole.

Claims (1)

[Scope of utility model registration request] a driving device, a connecting member having one end connected to the driving device and having one groove formed on the outer periphery; a connecting member protruding from the other end surface of the connecting member and spaced at equal intervals on the end surface of the crankshaft of the engine; a first protrusion and a second protrusion that fit into a plurality of flywheel mounting bolt holes arranged on the same circumference; and a first protrusion and a second protrusion that protrude from the other end surface and are positioned at a specific position with respect to the crankshaft on the crankshaft end surface. formed 1
The third one fits into the two crankshaft machining reference holes.
A phase detection device for a crankshaft, comprising a projection, and a pickup fixed to the connecting member and generating a signal each time the groove passes near the pickup.