JPS6129448B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention rotates the crankshaft of an internal combustion engine from its top dead center position to a desired angular position.
This invention relates to a crank angle indexing device.

Conventionally, in order to determine the crank angle by rotating the crankshaft from its center dead center position to a desired angular position in order to set the valve timing or adjust the ignition timing of an internal combustion engine (hereinafter also referred to as the engine), Attach a protractor to the crankshaft's crank pulley, rotate the crankshaft based on the center/dead center mark pre-engraved on the engine block side, and check the center/dead center mark of the crankshaft pre-engraved on the crank pulley and the cylinder block. Measure the angle between the point and dead center mark using a protractor, and make sure that this angle is the desired angle.
It was rotating the crankshaft. In this case, the angle was measured visually by the operator using a protractor. To rotate the crankshaft, an operator can manually rotate the crankshaft by using the clutch fixing pin attached to the flywheel, the ribs of the crank pulley, or by checking the outer or inner diameter of the flywheel. It was spinning.

For this reason, it is difficult to accurately determine the crank angle, and the determining operation takes time. Furthermore, if the dimensions of the crank pulley, flywheel, etc. differ, it is troublesome to prepare work tools correspondingly and to use them properly.

In view of the above, this invention is a crank angle determining device that can accurately determine the crank angle of an engine in a short time, and does not require any special tools even if the dimensions of the crank pulley etc. are different. The purpose is to provide the following.

In order to achieve the above object, the present invention is configured as follows. That is, the flywheel attached to one end of the crankshaft has a ring gear, the crank pulley attached to the other end of the shaft has a V groove indicating the center dead center position of the crankshaft, and the cylinder block on the crank pulley side has a ring gear. A crank angle indexing device for an internal combustion engine, which has a center/dead center mark on the crankshaft, is used when the pallet supporting the internal combustion engine at the top is raised and lowered by a lifter, and when the pallet supporting the internal combustion engine is raised by the lifter. , a rotary actuator that has a drive gear that meshes with the ring gear and is provided on one side of the upper part of the lifter and rotates the drive gear in forward and reverse directions; a V-groove detector that detects the V-groove of the crank pulley; A spindle, which is provided on the opposite side of the rotary actuator to the lifter and has the V-groove detector attached to its tip, is supported so as to be movable in the direction of the crank pulley, and by rotating the spindle, the V-groove detector is attached to the crank pulley. A spindle actuator that rotates along the outer circumference is connected to a V-groove detector, a spindle actuator, and a rotary actuator, respectively, and the spindle actuator is actuated to move the V-groove detector from the top dead center mark. The controller is fixed at a predetermined angular position and stops the operation of the rotary actuator when the V-groove of the crankshaft pulley rotated by the rotary actuator is detected.

With this configuration, when the lifter supporting the engine rises and the drive gear of the rotary actuator meshes with the ring gear, the controller operates the rotary actuator to rotate the crankshaft and crank pulley. When the V-groove detector detects the V-groove due to rotation of the crank pulley, the rotary actuator is stopped by the controller. At this time, if the controller accurately rotates the crankshaft in the forward or reverse direction by the same angle as the angle at which the V-groove detector rotates from the center/dead center mark of the cylinder block, the V-groove of the crank pulley will point. It matches the dead center mark, and the V groove is at the dead center. Therefore, when the crankshaft is rotated by a desired angle by the controller at this time, the crankshaft is indexed.

Next, the present invention will be explained based on embodiments shown in the drawings.

In the figure, reference numeral 1 denotes a rectangular pallet, on the upper surface of which a suitable number of legs 1a for supporting an engine 21 are provided. 2 is a lifter, which is provided on the floor surface F1 in a groove G provided below the floor surface F. This lifter 2 supports the pallet 1 on its upper part and is capable of being raised to a predetermined height from the position indicated by the two-dot chain line in FIG. 3 is a spindle actuator, which is mounted on the floor surface F on one side of the groove G (left side in the figure). This actuator 3 has a round bar-shaped spindle 4 protruding toward the groove G side, and this spindle 4 can move forward and backward in the axial direction of the actuator 3.
A hook-shaped arm 5 is attached to the tip of the spindle 4. This arm 5 is rotatable in a plane perpendicular to the axis of the spindle 4 and can be fixed at any angular position. A V-groove detector 6 is attached to the tip of the hook portion 5a of the arm 5 so as to be slidable on a plane perpendicular to the axis of the spindle 4. This V-groove detector 6 is for detecting a V-groove 23a, which is stamped on the outer periphery of a crank pulley 23 attached to the front end of the crankshaft 22 of the engine 21, and indicates the top dead center of the crankshaft 22. , a detector including a controller that measures the shape and displacement of a V-groove and detects its deepest position, or a proximity switch, etc. using a contact-type micro switch, a contact/non-contact displacement meter that is generally commercially available. is used.

7 is a rotary actuator, which is mounted on the floor F on the opposite side of the groove G from the spindle actuator 3. The rotary actuator 7 is a pulse motor or a motor with an encoder.
DC servo motors etc. are used. Reference numeral 8 denotes a reducer, which is attached to the groove G side with respect to the rotary actuator 7. At the tip of the shaft 8a of the reducer 8 that projects onto the groove G, there is a ring gear attached to the flywheel 24 of the engine 21. A drive gear 9 meshing with 25 is attached. 10 is a controller, which includes a spindle actuator 3;
It is connected to the V-groove detector 6 and rotary actuator 7 by cables 11, 12, and 13, respectively. Then, by operating the controller 10, the spindle actuator 3 is activated.
The spindle 4 is moved in its axial direction. Furthermore, the rotary actuator 7 is actuated by the operation of the controller 10, and the drive gear 9 is rotated via the reduction gear 8. Further, by operating the controller 10, the V-groove detector 6 detects the V-groove 23a.

The engine 21 whose crank angle is indexed by the above-mentioned crank angle indexing device is an engine that is in the process of being assembled (parts have not been completely installed), and the crank angle is A top dead center position 26 (for example, in the case of a four-cylinder engine, this indicates that the piston of the first or second cylinder is at the top dead center of the compression stroke) is engraved on the cylinder block 21a above the pulley 22. . And the V of crank pulley 23
The groove 23a is located at approximately the same position as the top dead center mark 26.

Next, the operation of this embodiment will be explained.

The engine 21 transported to this device is mounted on the pallet 1 mounted on the upper part of the lifter 2 located at the bottom of the groove G, as shown by the two-dot chain line in FIG. At this time, the ring gear 24 of the engine 21 is located on the drive gear 9 side, and the axes of both gears 24 and 9 are parallel to each other. On the other hand, the crank pulley 22 is located on the V-groove detector 6 side.

In this state, when the lifter 2 is raised to raise the pallet 1, the engine 21 is also raised. When the engine 21 rises, the ring gear 25 of the flywheel 24 and the drive gear 9 are engaged, but in this case, the ring gear 25 and the drive gear 9 move relative to each other in the tangential direction, and the drive gear 9 It is designed to mesh smoothly with the ring gear 25 while rotating.

Next, in order to position the V-groove detector 6 outside the crank pulley 23, the controller 10 operates the actuator 3 to move the spindle 4 toward the crank pulley 23.

Next, we will explain the case where the V-groove detector 6 is fixed at a position rotated by a certain angle α° counterclockwise with respect to the center dead center mark 26 as shown in FIG. 10 to operate the rotary actuator 7 and drive gear 9.
The ring gear 24 is rotated counterclockwise.
As the ring gear 24 rotates, the crankshaft 22 and crank pulley 23 also rotate in the same direction. When the crank pulley 23 rotates and its V groove 23a reaches the position of the V groove detector 6,
The V-groove detector 6 sends a detection signal of the V-groove 23a to the controller 10. When the controller 10 receives the V-groove detection signal, it immediately stops the rotary actuator 7. As a result, the crankshaft 22 and the crank pulley 23 stop rotating, and the V groove 23a of the crank pulley 23 moves to the top dead center mark 2.
It is located at a position rotated a certain angle α° counterclockwise from 6.

Next, when the controller 10 is operated to rotate the rotary actuator 7 and the ring gear 25 is rotated by a certain angle α° clockwise via the drive gear 9, the V groove 23a of the crank pulley 23 aligns with the top dead center mark 26. do. Therefore, the controller 10
By operating the crankshaft 22 to further rotate the crankshaft 22 at the top dead center position by a desired angle, the crankshaft 22 can be indexed.

In the above explanation, the V-groove detector 6 is placed in advance at the top dead center mark 26 of the cylinder block 21a.
The center dead center mark 26 of the cylinder block is detected by rotating another sensor (the same one as the V-groove detector 6) around the spindle 4, and then The V-groove 23a of the crank pulley 23 may be detected by the V-groove detector 6 fixed α° before the center dead center position, and the crank angle may be determined based on the V-groove 23a.

As is clear from the above explanation, according to the present invention, the crank pulley is moved to V by the command from the controller.
Rotate it toward the groove detector and check the V of the crank pulley.
After detecting the groove, the controller operates the rotary actuator to accurately rotate the crankshaft to the desired angular position based on the position of the V-groove detector, making crank angle determination extremely quick. It can be done on time and accurately.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a front view of the device excluding the controller, FIG. 2 is a plan view of the device, and FIG. 3 is an enlarged front view of the crank pulley portion of the engine. 1...Pallet, 2...Lifter, 3...Spindle actuator, 4...Spindle, 6...
V-groove detector, 7...Rotary actuator, 9...
Drive gear, 10...Controller, 21...Engine, 22...Crankshaft, 23...Crank pulley, 23a...V groove, 25...Ring gear, 26...Top dead center mark.

Claims (1)

[Scope of Claims] 1. A flywheel attached to one end of the crankshaft has a ring gear, a crank pulley attached to the other end of the shaft has a V groove indicating the top dead center position of the crankshaft, and A crank angle indexing device for an internal combustion engine having a top dead center mark of the crankshaft on the cylinder block on the pulley side, comprising: (a) a pallet that supports the internal combustion engine at the top and is raised and lowered by a lifter; A rotating actuator (c) crank pulley provided on one side of the upper part of the lifter, which has a drive gear that meshes with the ring gear and rotates the drive gear in forward and reverse directions when the pallet supporting the engine is raised. A V-groove detector for detecting the V-groove of Rotate along the outer periphery of the
A spindle actuator (e) provided at the upper part of the other side of the lifter is connected to the V-groove detector, the spindle actuator, and the rotary actuator, respectively, and operates the spindle actuator to move the V-groove detector to the upper end of the lifter. The controller is fixed after rotating from the dot mark to a desired angular position, and stops the operation of the rotary actuator when the V-groove detector detects the V groove of the pulley of the crankshaft which is rotated by the rotary actuator. Crank angle indexing device for internal combustion engines.