JP3394913B2 - Position control device for double rib belt for engine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field relating to position regulation when a multi-ribbed belt for an engine is wound around a multi-ribbed pulley.

[0002]

2. Description of the Related Art FIG. 3 is a side view comparing a conventional double-ribbed pulley with the present invention. The prior art will be described for the upper double-ribbed pulley. At the end of the engine, a timing chain and a timing belt covered with an end cover are arranged to drive the valve mechanism. The end cover is indicated by reference numeral 1, the cylinder block is located on the right side of the end cover, and the multi-ribbed pulley 2 is arranged immediately in front of the end cover 1. The multi-ribbed pulley 2 is an ordinary one having four rib grooves 3, and a flange 4 is integrally formed on the end cover 1 side. This flange 4 is installed in order to prevent the multi-ribbed belt from being mounted on the end cover 1 side while being displaced, that is, to prevent "slippage".

[0003]

Particularly, in an engine for an automobile, it is important to make the engine compact in size, and it is particularly important to reduce the dimension in the crankshaft direction as much as possible in order to be mounted on the vehicle. Is being watched. In the field such as the multi-ribbed belt / multi-ribbed pulley of the present invention, since the entry and exit of the size of the pulley portion directly affects the position of each pulley of the compressor for the air conditioner, the oil pump for the power steering, the generator, etc., The dimensional problems in this part are being pursued very strictly. Under such a background, the thickness of the flange 4 in FIG. 3 is desired to be removed in terms of size reduction.
However, if this is removed, the belt will "misalign".
It becomes impossible to prevent.

This type of dimensional problem becomes noticeable in a double rib pulley fixed to the end of the crankshaft.
Because, in the vicinity of the end of the crankshaft, a sprocket for a timing chain, a timing pulley for a timing belt, a rotor for detecting a crank angle, and a sensor therefor are generally arranged. The reduction in size of the device is even more serious.

[0005]

Means for Solving the Problem and Its Action The present invention is provided to solve the above-mentioned problems.
According to the first aspect of the present invention, a multi-ribbed pulley is arranged immediately before the end cover of the engine, and a multi-ribbed belt is wound around the endless cover to drive a compressor for an air conditioner, an oil pump for a power steering, a generator and the like. In the type, when a protrusion is formed on the end cover located on the lateral side of the multi-ribbed belt and the ribs of the multi-ribbed belt are mounted in a state of being displaced from the rib groove of the multi-ribbed pulley, the lateral side surface of the multi-ribbed belt is It is characterized in that it is configured to come into contact with the surface of the protrusion. Therefore, if the "risk" of the multi-ribbed belt occurs, the "rubbing noise" can be sensed during the trial run of the engine because the lateral sides of the multi-ribbed belt are in contact with the protrusions, and the misassembly of the multi-ribbed belt can be detected. Can be surely discovered. Then, by removing the flange, the dimension is reduced by the thickness.

According to a second aspect of the present invention, in the first aspect, the multi-ribbed pulley is fixed to an end portion of the crankshaft, and the crankshaft between the multi-ribbed pulley and the cylinder block is provided with a rotation driving means such as a sprocket or a timing pulley and a crank. It is characterized in that a rotor for detecting an angle is attached, and the above-mentioned operation can be obtained even in such a place where the rotation driving means, the rotor and the like are structurally congested.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail with reference to the embodiments of FIGS. In addition, about the part which performs the same function as the part demonstrated by the prior art of FIG. 3, the same code | symbol is described in the figure and detailed description is abbreviate | omitted. FIG. 1 is a front view of the engine 5, and the end cover 1 and the parts outside thereof are shown by a chain double-dashed line for the sake of easy understanding. A sprocket 7 is fixed to the crankshaft 6, and a timing chain 8 is attached to it.
The chain 8 is stretched around a sprocket 9 for driving an oil pump and sprockets 10 and 11 of a valve operating cam shaft, and an appropriate tension is applied by a tension mechanism 12. Although not shown, a timing belt and a timing pulley may be adopted instead of the timing chain, and the sprocket and the timing pulley are collectively referred to as a rotation driving means.

An end cover 1 for covering the aforementioned sprocket and timing chain is fixed to the front surface of the engine 5, and a multi-rib pulley, that is, a crank pulley 13 is arranged immediately in front of it. By the multi-ribbed belt 8a hung on it, the pulley 14 of the compressor for the air conditioner, the pulley 15 of the oil pump for the power steering, the pulley 16 of the generator, the pulley 17 for idle
The driving force is transmitted to the etc.

As is apparent from FIG. 2, a rotor 18 for detecting a crank angle is provided on the left side of the sprocket 7 for the crankshaft 6.
Is fixed to the sensor 19 and the sensor 19 is arranged near it. The sensor 19 is a cylindrical part, and the end cover 1
It is inserted in the cylindrical portion 20 formed in the lower part of the. An oil seal 21 (illustrated in a simplified manner) is installed at a position where the crankshaft 6 penetrates the end cover 1. The crank pulley 13 is attached to the crank shaft end by screwing a bolt 22 into the center of the crank shaft 6. Reference numeral 23 is a damper rubber, 24 is a cylinder head cover, 25 is a cylinder head, 26 is a cylinder block, 27 is an oil pan, and 28 is a bolt for fixing the end cover 1 to the front surface of the cylinder block 26. The end cover 1 is a cast aluminum alloy product.

In the multi-ribbed pulley according to the present invention, the aforementioned flange 4 is removed as shown in the lower side of FIG. A protrusion 29 is formed on the end cover 1 in order to regulate the “splitting” of the multi-ribbed belt. The projection 29 is located on the lateral side of the multi-ribbed belt 8a, and the flat surface 30 of the projection faces the lateral side surface of the multi-ribbed belt 8a. In FIG. 4, the multi-ribbed belt 8a is stretched across the rib groove 3 by one groove, and the lateral side surface of the multi-ribbed belt 8a comes into contact with the surface 30 in such an improperly assembled state. Thus, the height of the protrusion 29 is set. Figure 4
Although illustrated linearly, each part of the multi-ribbed belt 8a elastically deforms, so it is practical to draw a curved line. In FIG. 3, the gap between the right end of the multi-ribbed pulley 13 and the surface of the end cover 1 is cut down to the minimum level, so that the gap is the same in both upper and lower structures. Reference symbol L indicates a dimension reduced by removing the flange 4.

A plurality of protrusions 29 are provided. It is Figure 1
As is clear from the above, here, the ribs are provided at three locations, and only two locations can actually contact the multi-ribbed belt 8a.
Since the double rib belt 8a does not pass by the protrusion at the other one position, the position regulating function is not fulfilled in the case of this figure. This is because when the specification of the engine is changed and the type and number of the auxiliary machines are changed, the way of applying the multi-ribbed belt 8a is changed, and the protrusion 29 which is not functioning in FIG. 1 is made to function this time. . That is, the non-functioning protrusion is installed as a preliminary structure when the specifications are changed.

[0012]

According to the present invention, by removing the "flapping" preventing flange found in the prior art, the space corresponding to the dimension is reduced.
Moreover, the protrusions formed on the end cover "clip"
By detecting the "rubbing noise" at the time, it becomes possible to reliably detect the wrong assembly of the multi-ribbed belt. Such size reduction is due to the pulley of the air conditioner compressor,
The pulleys of the power steering oil pump, the generator pulley, and the idle pulley are arranged on a single virtual plane, so even if the size of the engine is reduced a little, it will interfere with the surrounding components. It has great advantages in solving problems.

When a multi-ribbed pulley is attached to the end of the crankshaft, a sprocket or timing pulley as described in FIG. 2, a rotor for crank angle detection, a sensor therefor, etc. are usually provided in the vicinity thereof. Therefore, it is very difficult to move the end cover here to the cylinder block side, and therefore the double rib pulley cannot be moved to the cylinder block side. However, according to the present invention, since the projection of the end cover is used as the substitute member for the flange, the function reduction due to the removal of the flange is avoided and the size reduction is realized.

[Brief description of drawings]

FIG. 1 is a front view schematically showing an end portion of an engine.

FIG. 2 is a sectional view taken along line (2)-(2) of FIG.

FIG. 3 is a side view showing a conventional structure of a multi-ribbed pulley and a structure of the present invention in a top-bottom comparison.

FIG. 4 is a vertical cross-sectional side view showing a partially assembled state of misassembly.

[Explanation of symbols]

5 engine 1 end cover 13 (2) Double rib pulley 8a Double rib belt 29 Protrusion 3 rib groove 30 surface 6 crankshaft 26 cylinder block 7 Rotation drive means 18 Crank angle detection rotor

Claims (2)

(57) [Claims] 1. A type in which a multi-ribbed pulley is arranged immediately in front of an end cover of an engine and a multi-ribbed belt is wound around the end pulley to drive a compressor for an air conditioner, an oil pump for a power steering, a generator and the like. When the ribs of the multi-ribbed belt are mounted in a state where the ribs of the multi-ribbed belt are displaced from the rib grooves of the multi-ribbed pulley, the lateral side surface of the multi-ribbed belt has a protrusion. A position regulating device for a multi-ribbed belt for an engine, characterized in that it is configured to come into contact with the surface. 2. The double-ribbed pulley according to claim 1, wherein the double-ribbed pulley is fixed to an end portion of the crankshaft, and the crankshaft between the double-ribbed pulley and the cylinder block has a rotary drive means such as a sprocket or a timing pulley and a rotor for detecting a crank angle. A position restricting device for a multi-ribbed belt for an engine, characterized in that the.