JPS5824042Y2 - Engine timing belt tension adjustment device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an engine timing belt tension adjustment device.

In the past, a chain was used as a transmission means that was wrapped around the engine crank pulley, cam pulley, and water pump, and the cam pulley and water pump were driven by the drive of the crank pulley, but recently, belts have been developed that do not require lubricating oil. It has been adopted because it has the advantage of being lightweight and lightweight.

As a tension adjustment device for the timing belt stretched over the crank pulley, cam pulley, and water pump pulley of the engine mentioned above, there is a device that uses a spring to adjust the tension, but there is a problem that the spring is easily broken.

This idea aims to solve the above problems,
The support plate on which the tension pulley is rotatably supported,
A fixing member consisting of a wedge material and a bolt is fixed so as to be movable in the belt tension direction by a wedge action, and a regulating member is provided which is screwed into the wedge material or bolt, and the end face of the regulating member is supported at least on the side opposite to the belt. The support plate on the side opposite to the belt, which is in contact with the plate □ and tends to float up, is fixed to the base member by a regulating member so as to be tightenable and loose.

This invention will be explained in detail below with reference to embodiments shown in the drawings.

In the overall view of the engine timing belt shown in FIGS. 1 and 2, 1 is the outer wall of the engine, 2 is a crank pulley driven by a crankshaft (not shown), 3 is a cam pulley, and 4 is a water pump. A timing belt 5 is stretched around the crank pulley 2, cam pulley 3, and water pump 4, so that the cam pulley 3 and water pump 4 are rotated as the crank pulley 2 is driven.

Reference numeral 6 denotes a timing belt tension adjustment device, which is attached to the water pump body 7, and the tension pulley 8 of the timing belt tension adjustment device 6 is indicated by the arrow X in FIG.
The timing belt 5 is moved in this direction to adjust the tension of the timing belt 5.

The above-mentioned timing belt tension adjustment device is shown in Figures 3 to 5.
In the figure, a tension pulley 8 is rotatably supported by a cylindrical support plate 10 via rollers 9.

A long hole 10b that is long in the belt tensioning direction (long in the vertical direction in FIG. 3) is bored in the center of the outer closed surface 10a of the support plate 10.

After fitting the wedge material 14 to the bolt 13, the wedge material 1
4 into the elongated hole 10b, at the same time, screw the bolt 13 into the base member 12 (the part protruding from the water pump body 7), press fit the wedge material 14 into the elongated hole 10b, and fix it at an appropriate position. There is.

At this time, the support plate 10 moves in the belt tension direction as the wedge member 14 moves in contact with the belt-side inner circumferential surface of the elongated hole 10b, and as the wedge material 14 is press-fitted, the support plate 10 moves toward the belt side. and the belt tension is increased.

As shown in FIG. 5, the elongated hole 10b has arcuate ends 10b1 in the belt tensioning direction, and linear end portions 10b2.

The wedge material 14 that fits into the elongated hole 10b has a linear shape in which both sides 14b fit into the elongated hole both sides 10b2, and an arc shape in which both ends 14a in the belt tension direction fit into the elongated hole ends 10b. Moreover, it is formed in a tapered shape with a smaller diameter along the axial direction.

Therefore, when the wedge material 14 is fitted into the elongated hole 10b,
The straight side portions fit together exactly, and the movement of the support plate 10 in the left-right direction in FIG. 5 is restricted regardless of the movement of the wedge member 14.

A cylindrical flange portion 14c is protruded from the large diameter end of the wedge member 14, and a screw 14a is cut on the outer periphery of the flange portion.

16 is a cylindrical regulating member made of Rocknite;
A screw 16b that engages with the screw 14d of the wedge member 14 is formed on its inner peripheral surface, and a protrusion 16a for abutting the support plate is formed on one end surface, so that no matter where the support plate 10 is located, The size is set such that the protrusion 16a abuts the end surface on the side opposite to the belt.

In the tension adjustment device having the structure described above, first,
By screwing the bolt 13 fitted with the wedge material 14 into the base member 12, the wedge material 14 is pressed from the one-dot chain line position to the solid line position to the two-dot chain line position in FIG. Press fit into 1fib.

At that time, the belt side end surface 14a of the wedge material 14 is connected to the elongated hole 1.
The support plate 10 moves in constant contact with the belt-side tip end surface 10b1 of the wedge member 0b, and in response to the movement of the wedge member 14, the support plate 10 moves in the belt tensioning direction.

A wedge member 14 is always in contact with the belt side of the support plate 10,
In order to press the wedge material 14 against the support plate 10 with the bolt 13, the belt side of the support plate 10 is fixed with a fixing member consisting of the wedge material 14 and the bolt 13.

On the other hand, on the side opposite to the belt of the support plate, the wedge material 14 is not press-fitted at the dashed line position and the solid line position.
The end surface of No. 4 on the side opposite to the belt is not in contact with the elongated hole 10b.

As described above, after the wedge material 14 is moved and fixed to a predetermined position, the regulating member 16 is screwed onto the wedge material 14.

The end surface of the protrusion 16a of the regulating member 16 comes into contact with the end surface of the support plate 10 on the side opposite to the belt, thereby compressing and fixing the support plate 10 to the base member 12.

Therefore, lifting of the support plate 10 on the side opposite to the belt is reliably prevented.

This invention is not limited to the above-mentioned embodiment, but as shown in FIG. It may also have a shape in which a screw hole 16'd for screwing is provided.

In this embodiment, no means for screwing the regulating member into the wedge member 14' is required.

The regulating member 16' is made by moving and fixing the wedge member 14' with the bolt 13 and nut 15, and then screwing it onto the bolt 13.
The protruding portion 16'a provided on the peripheral edge of the open side is pressed against the side of the support plate 10 opposite to the belt, thereby fixing the side opposite to the belt.

In the embodiment shown in FIGS. 7 and 8, a regulating protrusion 14"e is provided on the opposite side of the wedge member 14", a screw hole 14"f is bored in the protrusion, and the The regulating bolt 18 is screwed into the hole 14"f, and the end surface of the bolt 18 is brought into contact with the side opposite to the belt of the support plate 10, and then the nut 19 is screwed into the hole 14"f.
The support plate 10 is fixed to the base member 12 by pressing against the protrusion 14''e.

In each of the above embodiments, the hole 10a of the support plate 10 and the wedge members 14 to 14'' are both elongated in the belt tensioning direction, but the hole 10a may be a circular hole and the wedge member may be conical.

However, in this case, in order to restrict movement in the direction perpendicular to the belt tensioning direction, the support plate and base member can only be moved in the belt tensioning direction, and cannot be moved in the direction perpendicular to the belt tensioning direction. It is preferable that they match.

As is clear from the above description, according to the timing belt tension adjustment device according to the invention, in the device in which the tension pulley is fixed so as to be movable in the belt tensioning direction by a wedge action, the support plate on which the tension pulley is rotatably supported is fixed. Since the opposite side of the belt, which is not fixed by the wedge, is fixed to the base member by the regulating member, lifting can be prevented.

Therefore, it has the effect of being able to firmly fix the support plate to the base member at appropriate predetermined positions along with the belt side and the anti-belt side, and has the advantage that the tension of the timing belt can be maintained at a predetermined tension.

[Brief explanation of the drawing]

Figure 1 is an overall view of the engine timing belt, Figure 2 is a sectional view of the main parts of Figure 1, Figure 3 is a sectional view of the tension adjustment device, Figure 4 is a right side view of Figure 3, and Figure 4 is a right side view of Figure 3. Figure 5 is a right side view when the regulating member shown in Figure 3 is not attached, Figure 6 is a cross-sectional view showing another embodiment, Figure 7 is a cross-sectional view showing another embodiment, and Figure 8 is a cross-sectional view showing another embodiment. 7 is a right side view of FIG. 7. FIG. 2...Crank pulley 3...Cam pulley 4...Water pump, 5...
・Timing belt, 6...Tension adjustment device, 8
...Tension pulley 10 ... Support plate, 10b ... Long hole, 12 ... Base member, 13 ... Bolt, 14 ... ...Wedge material, 16...Regulation member.

Claims (1)

[Claims for Utility Model Registration] l A support plate that rotatably holds a tension pulley, a wedge member that allows the support plate to move freely in the tension direction of the belt by a wedge action against a fixed base member, and the wedge. A fixing member equipped with a bolt that adjustably fixes the wedge position of the material, and a regulating member that is screwed into the fixing member and presses the upper end surface of the support plate toward the base member in a freely tightening and loosening manner. An engine timing belt tension adjustment device characterized by: 2. The timing belt tension adjustment for an engine according to claim 1, wherein the regulating member is a lock nut that is screwed into a screw formed on the outer periphery of a wedge material constituting the fixing member. Device.