JP3082647B2 - Internal combustion engine test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transmitting a rotational driving force of a crankshaft generated in a combustion chamber to a camshaft via a rotation transmitting mechanism including a pulley and an endless conductive member to open and close an intake / exhaust valve. More particularly, the present invention relates to a test apparatus for an internal combustion engine that tests an internal combustion engine main body without the driving force generation mechanism and the rotation transmission mechanism.

[0002]

2. Description of the Related Art An internal combustion engine mounted on an automobile or the like is basically formed with a piston slidably provided in a cylinder and connected to a crankshaft, and formed between the piston and a cylinder head. A valve mechanism having an intake / exhaust valve for supplying fuel to the combustion chamber and discharging the combustion gas, and a camshaft for driving the valve mechanism. The rotation driving force of the crankshaft generated in the combustion chamber is transmitted to the camshaft via a rotation transmission mechanism including a pulley and an endless conductive member (for example, a timing belt) to open and close the intake and exhaust valves. It is configured so that

[0003] In the operation test of this type of internal combustion engine, conventionally, the fuel is supplied in a state where the ignition plug or the above-mentioned rotation transmission mechanism, which is a driving force generating mechanism, is incorporated in the internal combustion engine body, and the internal combustion engine is operated. It is actually operated. By the way, in recent years, an internal combustion engine without a driving force generating mechanism such as an ignition plug or a rotational force transmitting mechanism such as a timing belt is attached, that is, a cylinder head is assembled to a cylinder block, and a rocker cover is further assembled thereon. In a state called a so-called short engine, the number of cases in which this is shipped as a product has increased. Even when such a short engine is shipped, it is important to quantitatively measure performance in order to guarantee its quality. Therefore, conventionally, the above-described driving force generation mechanism and rotation transmission mechanism, and also external components such as an intake manifold and an exhaust manifold are attached to a short engine, and the internal combustion engine is operated by actually supplying fuel to improve the performance. After checking,
The product is shipped with the above-mentioned external parts removed.

[0004]

However, it is necessary to provide an external component for performance inspection, supply fuel, operate the internal combustion engine, check the performance, and remove the external component after a large number of work steps. There is a problem that it takes. In addition, since the internal combustion engine is operated by actually supplying fuel, the internal combustion engine body and external parts are easily contaminated with fuel and lubricating oil when the external parts are subsequently removed. The problem of getting worse occurred.

The present invention has been made in view of such circumstances, and an object of the present invention is to simplify an internal combustion engine in a so-called short engine state before a driving force generating mechanism, a rotation transmitting mechanism, and the like are provided. Another object of the present invention is to provide a test apparatus for an internal combustion engine capable of performing an operation test efficiently.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a rotational driving force of a crankshaft generated in a combustion chamber is transmitted to a camshaft via a rotation transmitting mechanism including a pulley and an endless conductive member to operate an intake / exhaust valve. The present invention relates to a test apparatus for an internal combustion engine that tests the internal combustion engine main body in a state where the internal combustion engine is not provided with the driving force generation mechanism and the rotation transmission mechanism of an internal combustion engine that is driven to open and close. A rotating shaft for a shaft and a rotating shaft for a camshaft are rotatably supported at positions corresponding to the shafts of the internal combustion engine body of a support base, and a first pulley is fixed to the rotating shaft for a crankshaft. A second pulley having a diameter twice as large as the first pulley is fixed to the camshaft rotary shaft, and an endless conductive portion is provided between these pulleys. The pulley is wound, and the respective pulleys are simultaneously driven to rotate at a predetermined rotation speed by a motor.

That is, an endless conductive member such as a timing belt is wound between pulleys fixed to the crankshaft and the camshaft and detachably connected to the camshaft, respectively. By rotating and driving the respective rotating shafts simultaneously, the crankshaft and the camshaft are rotated and driven in synchronism with each other in a state where fuel is not supplied, so that a predetermined operation performance can be tested. .

According to a second aspect of the present invention, the support base is provided so as to be rotatable about the crankshaft rotary shaft, and a plurality of camshaft rotary shafts corresponding to a plurality of types of internal combustion engines are provided. A second pulley fixed to each of the camshaft rotation shafts is provided rotatably at a position separated by a predetermined distance from the crankshaft rotation shaft and at a different position in the rotation direction of the support table. The endless conductive member is wound between the first pulley and the respective rotation shafts are simultaneously driven to rotate.

That is, a plurality of camshaft rotary shafts are provided, and the camshaft rotary shaft according to the internal combustion engine can be selected by rotating the support base. It is characterized by having versatility.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A test apparatus for an internal combustion engine according to one embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the concept of the apparatus of the embodiment, and 1 is a short engine to be tested. This short engine 1 is an internal combustion engine in which a cylinder head is mounted on a cylinder block and a rocker cover is mounted thereon, and a driving force generating mechanism such as a spark plug, a torque transmitting mechanism such as a timing belt, and the like. This is a state in which external parts such as an intake manifold and an exhaust manifold are not attached.

The test apparatus according to the embodiment tests the basic operating performance of the short engine 1 in the above-described state, and is basically detachably connected to the crankshaft and the camshaft of the short engine 1. The rotation shaft 2 for a crankshaft and the rotation shaft 3 for a camshaft are provided. And each of these rotating shafts 2,
3 is rotatably supported on a support table 4, and a timing belt 7 is stretched between first and second pulleys 5 and 6 fixed to the rotating shafts 2 and 3, respectively. (Rotating shafts 2 and 3) are simultaneously rotated by a motor 9 connected to the rotating shaft 2 via a torque meter 8.

More specifically, as shown in a schematic cross-sectional configuration view of FIG. 2 and a main part front view of FIG. 3, the crankshaft rotation shaft 2 is fixed on a base 11 of a test apparatus main body. The bearing 12 is rotatably supported. One end of the crankshaft rotary shaft 2 on the side facing the short engine 1 is connected to the crankshaft 1 of the engine 1.
The motor 9 is connected via a torque meter 8 to the rear end opposite to the connecting portion. The connecting portion has a projection 2 which can be fitted in a knock hole 1b for attaching a flywheel (not shown) provided at an end of the crankshaft 1a, for example, in the axial direction.
a is provided.

On the other hand, a substantially fan-shaped support base 4 is provided rotatably about the rotary shaft 2 at an intermediate portion of the crankshaft rotary shaft 2 rotatably supported by the bearing 12. The support base 4 is controlled to rotate to a predetermined angular position by an air cylinder 13 as shown in FIG.
The rotation position is selectively positioned by one movable stopper 14a and two fixed stoppers 14b and 14c. The movable stopper 14a is pushed out when positioning the support 4 at the position shown by the solid line in FIG. 3, and abuts on the lower end of the support 4 to define its rotational position. When the support table 4 is positioned at the position shown by the broken line in FIG. 3, the support table 4 is pulled out of the rotation area to allow the support table 4 to rotate. As a result, the support base 4 is rotated to a position where the lower end thereof selectively comes into contact with the fixed stoppers 14b and 14c, and is positioned at the respective rotational positions.

A bearing 15 is interposed between the rotary shaft 2 for the crankshaft and the support 4 so that the support 4 is supported only by the rotary shaft 2 for the crankshaft. The rotation of the table 4 and the rotation of the crankshaft rotary shaft 2 are mechanically separated so as not to interfere with each other. The camshaft rotary shaft 3 described above is rotatably attached to a predetermined position on the rotary end side of the support base 4 whose rotary position is controlled in parallel with the crankshaft rotary shaft 2. Can be That is, in this example, three camshaft rotary shafts 3a, 3b, 3c corresponding to the type of the short engine 1 to be tested are provided at predetermined positions of the support base 4, respectively. These three
The camshaft rotary shafts 3a, 3b, 3c are the crankshafts 1a of the short engine 1 to be tested.
Relationship between the shaft and the camshaft 1c (distance and arrangement angle)
Is different depending on the type, the camshaft 1c position of each short engine 1 is set based on the rotation shaft 2 for the crankshaft and according to the selectively set rotation position of the support base 4. It is attached to each part. In other words, when the support base 4 is selectively positioned at each of the above-described rotational positions according to the type of the short engine 1 to be tested, the three camshaft rotary shafts are provided at these positions. Each of the rotating shafts 3a, 3b, 3c is rotatably supported via a bearing 16 at a position where one of 3a, 3b, 3c faces the camshaft 1c of the short engine 1.

By setting such an arrangement relationship, the rotation of the support 4 is controlled in accordance with the type of the short engine 1 to be tested, and in this state, the rotation shaft 2 for the crankshaft is moved to the short engine. When connected to one crankshaft 1a, at the same time
The camshaft rotary shaft 3 corresponding to the engine 1
Are linked.

The camshaft rotating shafts 3a, 3b, 3
The end of the cam c facing the camshaft 1c is provided with a protruding piece that can be fitted into a well-known distributor or a keyway for mounting a crank angle sensor provided on an end face of the camshaft 1c, for example, from the rear in the axial direction. It is a connecting part. On the back side of the support table 4, the first and second pulleys 5, 6 (6a, 6b, 6c) are attached to the crankshaft rotary shaft 2 and the three camshaft rotary shafts 3a, 3b, 3c. ) Are fixed. A timing belt 7 as an endless conductive member is wound between these pulleys 5 and 6, and the first and second pulleys 5 and 6 are passed through the timing belt 7.
(6a, 6b, 6c) are connected so as to rotate integrally.

The second pulley 6 (6a, 6b, 6c)
Is set to twice the diameter of the first pulley 5, and when the first pulley 5 makes two rotations, the second pulley 6 (6a, 6b, 6c) makes one rotation in synchronization with this. It has become something. That is, the diameters of the first and second pulleys 5 and 6 are set so that the camshaft rotary shaft 3 makes one rotation in synchronization with the two rotations of the crankshaft rotary shaft 2. They are connected via a timing belt 7.

According to the test apparatus thus constructed, the support base 4 is rotated according to the type of the internal combustion engine (short engine) to be tested to select the camshaft rotary shaft 3, The above-described rotary shafts 2 and 2 are attached to the crankshaft 1a and the camshaft 1c of the engine 1, respectively.
3 are connected. This connection is performed, for example, by using the base 1
By sliding the test apparatus 1 toward the short engine 1, the test apparatus is moved in the direction of its rotation axis. In this connection state, the motor 9 is started, and the rotation shaft 2 for the crankshaft is driven to rotate via the torque meter 8. Then, the rotational force is also transmitted to the camshaft rotation shaft 3 via the timing belt 7, so that the crankshaft 1a and the camshaft 1c of the short engine 1 can be synchronously rotated at a predetermined timing.

Therefore, external components such as an intake manifold and an exhaust manifold can be attached to the short engine 1 to be tested, and the operation of the engine 1 can be tested without supplying fuel. Specifically, since the torque meter 8 is attached to the crankshaft rotary shaft 2, the rotary shaft 2 is driven to rotate at a predetermined rotation speed by the motor 9, and the rotation torque at that time is measured. This makes it possible to test the degree of friction at the sliding portion inside the cylinder, that is, the state of various seal metals inside the cylinder.

At this time, the hole for mounting the ignition plug is sealed with a seal member 10 as shown in FIG. 1, and the compression pressure in the combustion chamber is measured by a pressure sensor incorporated in the seal member 10. It is possible to inspect the quality and function of pistons, piston rings, gaskets, etc. Further, if a dummy oil filter is attached to the oil filter attachment portion to measure the oil amount and the oil pressure, the function of the oil pump can be inspected.

By measuring the oil pressure and the oil amount in the above-described test, it is possible to inspect not only the performance of the oil pump but also whether or not the oil line is blocked, and to measure the torque and the compression pressure. By doing so, it is possible to inspect for gas leaks and further to check for the presence of incorrect assembly of the piston and the connecting rod. Therefore, when a product is shipped as a short engine, a basic performance test can be easily and effectively performed, which can greatly contribute to the performance and quality assurance. In addition, since it is not necessary to incorporate external parts such as manifolds required for starting the engine as in the past and remove these parts after the test is completed, it is possible to reduce the inspection man-hour and greatly shorten the work time Becomes Further, since it is not necessary to use gasoline as a fuel, a great effect in practical use can be obtained, for example, the working environment can be greatly improved.

The present invention is not limited to the embodiment described above. For example, in the embodiment, by sliding the base 11, the entire test apparatus is moved in the axial direction, and the rotary shafts 2 and 3 are respectively connected to the crankshaft 1a and the camshaft 1c of the short engine 1. However, on the contrary, a configuration in which the test table side on which the short engine 1 is mounted is slid toward the test apparatus may be adopted. At this time, it is preferable that a table elevating mechanism or the like for aligning the rotation axes of the engine 1 and the test apparatus be incorporated into the base 11 or the test table.

In the embodiment, three camshaft rotary shafts 3 are provided on the support base 4 and these are selectively used, but the number is not particularly limited. For example, the present invention can be realized as a test device for a specific engine including only one crankshaft rotation shaft 2 and one camshaft rotation shaft 3. In this case, each rotating shaft 2, 3
Is fixedly determined, so that the above-described rotation mechanism of the support base 4 and the control mechanism thereof are not required.

Further, in the embodiment, pulleys 5 fixed to the respective rotating shafts 2 and 3 using the timing belt 7 are provided.
6, the pulleys 5 and 6 may be connected using a chain, the rotating shafts 3 and 4 may be connected using a gear mechanism, or the pulleys 5 and 6 may be directly frictionally connected. A configuration in which rotation is transmitted by contact is also possible. In addition, the present invention can be variously modified and implemented without departing from the gist thereof.

[0025]

As described above, according to the present invention, the crankshaft rotary shaft and the camshaft are detachably connected to the respective shafts of the internal combustion engine without the driving force generating mechanism and the rotation transmitting mechanism. A first rotating shaft that is fixed to the rotating shaft for the crankshaft.
And a second pulley having a diameter twice as large as the first pulley fixed to the camshaft rotation shaft by an endless conductive member. Since the crankshaft and the camshaft are rotationally driven at the same time at the rotation speed, thereby rotating the crankshaft and the camshaft in a state where the fuel is not supplied to the internal combustion engine,
The predetermined operating performance of the internal combustion engine can be easily and effectively tested without assembling external parts such as a manifold.

According to the present invention, a plurality of camshaft rotary shafts corresponding to a plurality of types of internal combustion engines are provided, and these rotary shafts are selectively used by rotating a support. Therefore, various types of internal combustion engines can be efficiently tested by giving versatility to the type of internal combustion engine to be tested.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a schematic configuration of a test apparatus for an internal combustion engine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional configuration diagram illustrating an overall schematic configuration of the embodiment apparatus.

FIG. 3 is a front view of a main part showing a relationship between each rotation shaft and a support base in the embodiment device.

[Explanation of symbols]

 Reference Signs List 1 internal combustion engine (short engine) 2 rotary shaft for crankshaft 3 (3a, 3b, 3c) rotary shaft for camshaft 4 support base 5 first pulley 6 (6a, 6b, 6c) second pulley 7 timing belt 8 Torque meter 9 motor

Claims (2)

(57) [Claims] 1. An internal combustion engine for transmitting a rotational driving force of a crankshaft generated in a combustion chamber to a camshaft via a rotation transmitting mechanism including a pulley and an endless conductive member to open and close an intake / exhaust valve. An apparatus for testing an internal combustion engine by rotating both shafts of an internal combustion engine body without a driving force generation mechanism and the rotation transmission mechanism, wherein the crankshaft is detachably connected to each of the shafts. A rotating shaft for camshaft and a rotating shaft for camshaft, and a support base rotatably supporting each of these rotating shafts at a position corresponding to each shaft of the internal combustion engine body,
A first pulley fixed to the crankshaft rotation shaft, and a first pulley fixed to the camshaft rotation shaft;
A second pulley having a diameter twice that of the pulley, an endless conductive member wound between the pulleys, and a motor for rotating the pulley at a predetermined rotation speed. Internal combustion engine test device. 2. The support base is provided to be rotatable about the crankshaft rotation shaft, and the camshaft rotation shaft is provided at a predetermined position from the crankshaft rotation shaft in accordance with a plurality of types of internal combustion engines. At a position separated by a distance, and provided in a plurality of different positions in the rotation direction of the support table,
The endless conductive member is wound between a second pulley fixed to each of the camshaft rotary shafts and the first pulley, and the rotary shafts are simultaneously driven to rotate. The test apparatus for an internal combustion engine according to claim 1, wherein