KR100395014B1 - Timing belt tensioner for vehicle - Google Patents

Abstract

The present invention relates to a tensioning device for a timing belt for a vehicle, comprising: a body having a plurality of cylinders radially arranged in a circumferential direction, the body having an oil supply passage communicating with any one of the cylinders, and each inserted into a cylinder of the body; A plurality of pistons coupled to each other, a plurality of elastic members each elastically supporting the piston, a tension pulley commonly contacted and supported by the front end of each piston and a uniform elastic force to the outside of the body, and an outer surface of the tension pulley It characterized in that it comprises a timing belt which is contacted to receive a tensile force by the pressure of the engine oil supplied through the oil supply passage of the body according to the operation of the engine.

Therefore, according to the present invention, since the tensile force is applied by the pressure of the engine oil only when the engine is driven, it is possible to reduce the stress applied to the timing belt, thereby not only extending the endurance life but also reducing the horsepower of the engine. have. In addition, the number of parts can be reduced, cost reduction and light weight can be achieved, and since the tension is not applied to the timing belt except when the engine is started, it is easy to detach and improve disassembly and assembly.

Description

Tensioning device for vehicle timing belt {TIMING BELT TENSIONER FOR VEHICLE}

The present invention relates to a tensioning device for a vehicle timing belt, and more particularly, to a tensioning device for a vehicle timing belt for adjusting the tension of the timing belt by using the pressure of the engine oil supplied from the inside of the engine.

In general, a timing belt used in an engine part of a vehicle is a power transmission means used to drive a water pump, a camshaft sprocket, etc. by the power of a crankshaft sprocket when driving the engine. For example, if the timing belt is momentarily loosened due to the acceleration or deceleration caused by the change of engine speed (r.p.m) during driving after starting the engine or when stopping or starting, the efficiency of power transmission decreases. Therefore, in order to prevent this, a timing belt tensioner (Timing Belt Tensioner), that is, a tensioning device is required at the timing belt located in the longest section among the various sprockets. The tensioning device of the timing belt keeps the timing belt in a tense state (tense state) at all times to prevent the loss of power to obtain the best driving conditions.

1 is a partial cross-sectional view showing a tensioning device of a conventional vehicle timing belt.

1, the timing belt 1 is wound between a crankshaft sprocket 2, a camshaft sprocket 3 with a timing mark and a water pump pulley 4, where the timing belt tensioning device 5 is cranked. It is provided between the shaft sprocket 2 and the cam shaft sprocket 3.

Looking at the configuration of the conventional timing belt tensioning device (5), the body (6) with the piston (6a), a spring (6b) for elastically supporting the piston (6a) and the tip of the piston (6a) Arm 7 coupled to the tension pulley 8 is a pulley 8 which is an orbital pulley that can receive the tension force from the arm 7 toward the timing belt 1 and press it with an appropriate tension.

In the conventional timing belt tensioning device 5 configured as described above, when the crankshaft sprocket 2 is driven in accordance with the operation of the engine, the driving force is driven by the timing belt 1 to the camshaft sprocket 3 and the water pump pulley ( 4) to open and close the valve (not shown) or to circulate the coolant. At this time, the back of the timing belt 1 through the tension pulley 8 on the principle of the lever using the arm 7 by the piston 6a under the tension of the spring 6b in the body 6 of the tensioning device. Tensile force is applied to the

However, such a mechanical tension device always maintains a state in which tension force is applied to the timing belt 1 regardless of whether the engine is stopped or operated, and there is a concern that the durability of the device may be degraded. ) When replacing or mounting), it is difficult to separate and assemble due to tension. Of course, even if it takes a configuration that further combines a separate hydraulic cylinder rather than disadvantageous in terms of load and will have the above problems as it is.

Accordingly, the present invention has been made to solve the above problems, an object of the present invention is to provide a tensioning device of a timing belt for a vehicle that can be automatically adjusted the tension applied to the timing belt in accordance with the supply of engine oil. There is.

1 is a partial cross-sectional view showing a tensioning device of a conventional vehicle timing belt.

2 is a partial cross-sectional view showing a tensioning device for a timing belt for a vehicle according to the present invention;

3 is a cross-sectional view taken along the line A-A of FIG.

4A and 4B are sectional views showing an operating state of a tensioning device of a timing belt for a vehicle according to the present invention;

※ Explanation of code for main part of drawing

10: timing belt 20: timing belt tensioning device

22: body 22a: cylinder

22b: oil supply passage 24: piston

26: elastic member 28: tension pulley

The tensioning device for a vehicle timing belt according to the present invention for achieving the above object is a body having a plurality of cylinders radially arranged in the circumferential direction, the body having an oil supply passage in communication with any one of the cylinders, A plurality of pistons each inserted into and coupled to the cylinder, a plurality of elastic members each elastically supporting the piston, and a pulley pulled in common contact support by the front end of the piston and a uniform elastic force to the outside of the body; It characterized in that it comprises a timing belt in contact with the outer surface of the tension pulley so as to receive a tensile force by the pressure of the engine oil supplied through the oil supply passage of the body in accordance with the operation of the engine.

The oil supply passage of the body is preferably in communication with the cylinder located on the timing belt side.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

2 is a partial cross-sectional view showing a tensioning device for a timing belt for a vehicle according to the present invention, Figure 3 is a cross-sectional view taken along line AA of FIG.

In the figure, reference numeral 20 denotes a timing belt tensioning device of the present invention, which is a tensioner which is automatically adjusted so that the tension applied to the timing belt 10 can be reduced depending on whether or not engine oil is supplied.

The configuration of the tension device 20 of the present embodiment will be described in detail. The bracket 22c of the body 22 is fixed to the cylinder block 30 of the engine by the fixing screw 40. A plurality of cylinders 22a are radially arranged at regular intervals in the circumferential direction, and an oil supply passage 22b is in communication with one of the cylinders 22a. The oil supply passage 22b is connected to the oil supply passage 32 formed in the cylinder block 30 so that the engine oil can flow.

Moreover, the oil supply passage 22b of the body 22 is most preferably in communication with the cylinder 22a located on the timing belt 10 side, in which the engine oil is passed through the oil supply passage 22b during engine operation. This is to allow a tension force to be applied to slightly move the tension pulley 28, which will be described later, slightly toward the timing belt 10.

Inside each cylinder 22a of the body 22, a plurality of pistons 24 (shown as three in the figure) are inserted and coupled, respectively, and the tip portion thereof protrudes outward. An elastic member 26 such as a coil spring is interposed between the bottom surface of the cylinder 22a of the body 22 and the back surface of the piston 24. A tension pulley 28 is mounted around the outer circumference of the body 22, and the inner circumferential surface of the tension pulley 28 and the tip of each piston 24 are commonly contacted by a uniform elastic force. The timing belt 10 is in contact with the outer circumferential surface of the tension pulley 28 so as to receive a tension force.

The operation relationship of the timing belt tensioning device 20 according to the embodiment of the present invention provided as described above will be described with reference to FIGS. 4A and 4B.

In FIG. 4A, when the engine of the vehicle engine is turned off, the engine oil is not supplied from the oil pump (not shown), and thus no oil pressure is applied to the oil supply passage 22b. Accordingly, since the elastic force of the elastic member 26 is uniformly applied to the pistons 24 disposed in the respective cylinders 22a of the body 22, the tension pulley 28 is concentric with the body 22 by balancing the forces. It is located on the axis. That is, only the slight elastic force of the elastic member 26 toward the timing belt 10 is maintained and the tension force separately required is not applied at all. This may facilitate the detachment when the timing belt 10 is detached or assembled.

On the other hand, when starting the vehicle engine as shown in FIG. 4B, one cylinder 22a positioned at the timing belt 10 side through the oil supply passage 22b has an engine oil pressure of about 5 Bar or more. It works internally. At this time, the piston 24 disposed here is pushed out and the tension pulley 28 is pushed toward the timing belt 10 only by the stroke amount of the piston 24 to balance the force applied to each piston 24. Will be broken. Thus, the back of the timing belt 10 is brought into tighter tension with the tension pulley 28.

After that, when the engine is turned off again, one piston 24 located on the timing belt 10 side which has been pushed out by the action of oil pressure is returned to its original position because the supply of engine oil is stopped as in the case of the above-described start-off. By returning, a force balance is achieved for each piston 24 of the body 22. As a result, the tension applied to the timing belt 10 is removed again.

According to the present invention described above, since the tensile force is applied by the pressure of the engine oil only when the engine is driven, it is possible to reduce the stress applied to the timing belt, thereby not only extending the endurance life but also reducing the horsepower consumption of the engine. It may be. In addition, the number of parts can be reduced, cost reduction and light weight can be achieved, and since the tension is not applied to the timing belt except when the engine is started, it is easy to detach and improve disassembly and assembly.

Claims (2)

A body having a plurality of cylinders radially arranged in the circumferential direction and having an oil supply passage communicating with any one of the cylinders; A plurality of pistons each inserted into the cylinder of the body; A plurality of elastic members each elastically supporting the piston; Tensile pulley which is in common contact support by the front end and the uniform elastic force of each piston on the outside of the body, And a timing belt contacting the outer surface of the tension pulley so as to receive a tension force by the pressure of the engine oil supplied through the oil supply passage of the body according to whether the engine is operated. According to claim 1, And the oil supply passage of the body communicates with a cylinder located on the timing belt side.