JPS628738B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission mechanism that interlocks the operating shaft of an internal combustion engine testing device and the main shaft of an internal combustion engine when performing a performance test of the internal combustion engine using the testing device.

Conventionally, internal combustion engine tests were carried out using the following steps, as shown in Figure 1.
By arranging the internal combustion engine 2 facing the test apparatus 1 and operating the internal combustion engine 2 with the operating shaft 3 of the test apparatus 1 and the main shaft 4 of the internal combustion engine 2 interlockingly connected by the universal joint 5. It is done. Here, the interlocking of the test device 1 and the internal combustion engine 2 is achieved by bolting up 8 a flange 6 integral with the main shaft 4 and a connecting flange 7 of the universal joint 5 at a plurality of locations. However, according to this bolt-up 8 method, the work of joining and separating cannot be performed quickly, which hinders the improvement of testing efficiency.

In order to solve such problems, it is conceivable to interpose the rotational drive coupling device disclosed in Japanese Patent Publication No. 14006/1988 between the flanges 7 and 8, for example. In this conventional structure, a plurality of recesses are formed on the outer periphery of a disk flange connected to the cylinder shaft side, and a pin-shaped transmission element with a knurled head is rotatable in the disk connected to the cardan shaft side. Attach it to the
A semicircular portion that can be fitted into and removed from the recess is formed near the end of the pin, and a semicircular step portion is formed outside the semicircular portion. The transmission element is then rotated to fit the semicircular portion into the recess and engage the stepped portion with the end face of the disc flange, thereby connecting the disc flange and the disc via this transmission element. At that time, the connected posture is maintained by a spring-loaded selection device. Further, the connection is released by rotating the transmission element to disengage the semicircular portion from the recess and at the same time disengage the step from the end face of the disc flange.

According to this conventional structure, the disc flange and the disc can be quickly connected and separated. However, when a conventional structure is adopted for power transmission in a test of a high-speed rotating internal combustion engine, there is a risk that the transmission element may unexpectedly rotate due to rotational centrifugal force and become uncoupled.
In this case, since there are multiple transmission elements, the transmission state is maintained, but if some of them become disconnected, the transmission will be disturbed, making it impossible to perform accurate tests. Furthermore, since the transmission is via the deformed semicircular portion, this semicircular portion is likely to break.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power transmission mechanism for an internal combustion engine testing device that allows quick connection and separation operations and does not cause separation or breakage during high-speed rotation tests.

In order to solve the above-mentioned problems, the power transmission mechanism in the internal combustion engine testing device of the present invention is arranged between a main shaft side flange and an operating shaft side flange. A coupling structure that prevents the two flanges from separating by causing the two flanges to separate from each other, and a rotational force transmission structure that can be engaged and detached along the rotation axis in the coupled state are provided.

According to the configuration of the present invention, when testing an internal combustion engine, first the main shaft side flange and the operating shaft side flange are brought close to each other, and then the flanges are rotated relative to each other by a predetermined amount around the axis of rotation. They may be bonded by a bonding structure in a manner that prevents separation. After this connection is made, by engaging the rotational force transmission structure along the rotational axis, it is possible to establish a rotational transmission state between both flanges.
This allows interlocking between the main shaft of the internal combustion engine and the operating shaft of the testing device. Also, by reverse operation, both flanges can be separated.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 7.

A dynamometer 11 is an example of an internal combustion engine testing device, and a flange 13 is integrally attached to an operating shaft 12 of the dynamometer. 14 is an internal combustion engine, and a flange 16 is integrally attached to the main shaft 15 of the engine. 17 is a universal joint, propeller shaft 18
, a spline-type telescoping shaft 19, and connecting flanges 20 and 21 at both ends, one connecting flange 20 and a flange 1 integral with the operating shaft 12.
3 has been previously combined. Therefore, the universal joint 17 is integrated with the operating shaft 12,
Thus, the other connecting flange 21 becomes the operating shaft side flange in the present invention. Between the flange 16 and the connection flange 21, both flanges 16, 21 are provided.
a coupling structure 22 that prevents the flanges 16 and 21 from separating by rotating them relative to each other by a certain amount around the rotational axis after bringing them close to each other; and a rotational force transmission structure that can be engaged and disengaged along the rotational axis in the coupled state. 23 are provided. That is, at the front of the flange 16
Large diameter head 24A forward from two locations displaced by 180 degrees
A retaining pin 24 is provided, and power transmission pin insertion holes 25 are provided at two locations displaced by 90 degrees from the pin attachment portion. Further, the connecting flange 21 is provided with locking holes 26 at two locations displaced by 180 degrees. These locking holes 26 include a large-diameter hole 26A through which the large-diameter head 24A passes, and an arc-shaped hole that communicates with the large-diameter hole 26A and extends at a predetermined angle (θ) in the circumferential direction about the rotation axis. The long hole 26B is formed to have a width that allows the leg portion of the retaining pin 24 to move but prevents the large diameter head portion 24A from passing through. This locking hole 26 and the retaining pin 24 constitute a coupling structure 22.
Furthermore, a retaining pin 24 is provided on the connection flange 21.
A power transmission pin 27 is provided that corresponds to the power transmission pin insertion hole 25 in a removable manner when the power transmission pin insertion hole 25 corresponds to the elongated hole 26B. That is, a cylindrical bushing 28 is attached to the connecting flange 21, and a power transmission pin 27 inserted into the cylindrical bushing 28 is attached to the connecting flange 21.
A compression coil spring 30 is provided between the cylindrical bush 28 and a cap 29 that is integral with the cylindrical bush 28 to urge the power transmission pin 27 to protrude toward the insertion hole 25 side. The power transmission pin 27 passes through the cap 29 and projects forward, and a grip 31 is attached to the projecting portion. The power transmission pin 27 can be pushed, pulled, and rotated via the grip 31. At this time, the long leg 31A and the short leg 31B can be selectively brought into contact with the cap 29 on the grip 31 side, and the power transmission pin 27 can be brought into contact with the long leg 31A when the long leg 31A is brought into contact with the cap 29. It is configured to be pulled out into the insertion hole 25. The rotational force transmission structure 23 is constituted by the above 27 to 31 and the insertion hole 25.

In the above configuration, the operating shaft 12 and the main shaft 15
The linkage is performed as follows. That is, when the internal combustion engine 14 is installed in a predetermined position, the universal joint 17
is contracted, and the power transmission pin 27 is in the fourth position.
As shown in the figure, the elongated leg 31A connects to the cap 29.
Entering and exiting by coming into contact with. In this state, the large diameter hole 26A of the connection flange 21 is opposed to the retaining pin 24 of the flange 16. Then, by adjusting the amount of extension of the telescopic shaft 19, the connecting flange 21
advance along the rotation axis. Then large diameter hole 2
6A allows the large diameter head 24A to pass through, so the retaining pin 24 passes through the large diameter hole 26A, and when the connecting flange 21 comes into contact with the flange 16, the large diameter head 24A is connected. Flange 21
(See imaginary line A in Figure 5). In this state, either of the flanges 16, 21 is relatively rotated by a predetermined angle (θ) around the rotation axis, and the retaining pin 24 is positioned in the elongated hole 26B as shown by the imaginary line B in FIG. . This allows the large diameter head 2
4A faces the elongated hole 26B, the connection flange 20 is no longer separated from the flange 16. At this time, as shown in FIG. 4, the retracted power transmission pin 27 faces the insertion hole 25. Therefore, by rotating the power transmission pin 27 via the grip 31, the short leg portion 31B faces the cap 29, and the elastic force of the compression coil spring 30 causes the power transmission pin 2 to rotate.
7 moves forward along the rotation axis and enters into the insertion hole 25 as shown in FIG. This completes the interlocking, and the rotational force of the main shaft 15 is transmitted to the operating shaft 12 via the flange 16, power transmission pin 27, connection flange 21, and the like.
Note that the flanges 16 and 21 can be separated by almost the reverse operation.

As described above, according to the present invention, when testing an internal combustion engine, first the main shaft side flange and the operating shaft side flange are brought close to each other, and then both flanges are rotated relative to each other by a predetermined amount around the rotation axis. , these flanges can be coupled by a coupling structure in a state that prevents them from separating. After this connection is made, the rotational force transmission structure is engaged along the rotational axis, thereby bringing the flanges into a rotational transmission state. Thereby, the main shaft of the internal combustion engine and the operating shaft of the testing device can be interlocked, and the flanges can be separated by a reverse operation. Thus, according to the present invention,
Connection and separation work can be done quickly, improving test efficiency.Furthermore, by dividing the connection and transmission into structures with different action directions, it is possible to prevent separation from occurring during the test run. In addition, the transmission member of the transmission structure can be made into a shape that is strong against rotational transmission and does not cause breakage.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view showing a conventional example, Figs. 2 to 7 show an embodiment of the present invention, Fig. 2 is a schematic front view, Fig. 3 is a partially cutaway front view, and Fig. 4 5 is a side view of the operating shaft side flange, FIG. 6 is a sectional view taken along line AA in FIG. 5, and FIG. 7 is a side view of the main shaft side flange. 11... Dynamometer (internal combustion engine testing device), 12... Working shaft, 14... Internal combustion engine, 15... Main shaft, 16... Flange (main shaft side flange), 17... Universal joint, 21... Connection flange (working shaft side flange) , 22...coupling structure, 23...rotational force transmission structure,
24...Keeping pin, 24A...Large diameter head, 25...
Power transmission pin insertion hole, 26...locking hole, 26A...
Large diameter hole, 26B... Long hole, 27... Power transmission pin, 3
0...Compression coil spring.

Claims (1)

[Claims] 1. To move the operating shaft of the internal combustion engine testing device and the main shaft of the internal combustion engine, bring both flanges close to each other between the main shaft side flange and the operating shaft side flange, and then rotate them relative to each other by a predetermined amount around the axis of rotation. 1. A power transmission mechanism for an internal combustion engine testing device, comprising: a coupling structure that prevents separation of both flanges; and a rotational force transmission structure that can be engaged and detached along a rotational axis in a coupled state.