JP2000304114A - Belt tension adjusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent inclination of a mounting attitude of an auto tensioner by engaging a tip part of a set pin for preventing spring-out of a rod of the auto tensioner to a positioning hole provided on a fixing member in a belt tension adjusting device imparting required tension to a belt by a tension pulley. SOLUTION: A belt tension adjusting device constituted of an auto tensioner 1 and a tension pulley 2 is fixed to a fixing member 6 such as an engine block, a rod 11 of the auto tensioner 1 is preliminarily pushed, the rod pin hole 16 is matched with a cylinder pin hole 15 and a set pin for preventing spring-out of rod 18 is inserted. A tip part of the set pin 18 projected from an outer peripheral surface of a cylinder 3 is engaged to a positioning hole 17 of the fixing member 6. Thus, the rod 11 is made away from a pin 9, spring force of a tension adjusting spring 13 is prevented from being applied to the tension pulley 2, a mounting work is made easy and positioning accuracy of the auto tensioner 1 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt tension adjusting device for applying a constant tension to a timing belt of an automobile engine.

[0002]

2. Description of the Related Art An auto-tensioner attached to a fixed member such as an engine block and a tension pulley operated by the auto-tensioner. A rod is provided in a cylinder of the above-mentioned auto-tensioner and a tension adjustment for applying a spring force to the rod. Conventionally, a belt tension adjusting device that accommodates a spring for use in a vehicle and applies a pressing force to the tension pulley by a rod of the auto tensioner so as to apply a required tension to the belt has been conventionally known (for example, Japanese Patent Application Publication No. See JP-A-8-100851).

In the belt tension adjusting device as described above, the rod accommodated in the cylinder of the auto tensioner resists the elasticity of the tension adjusting spring inside the cylinder in order to facilitate the work of assembling the belt with the engine block or the like. And push it into the cylinder.Pass a set pin to prevent the rod from protruding from the outer peripheral surface of the cylinder and rod into the cylinder and rod, and perform the assembly work with the rod retracted from the tension pulley by this set pin. It is also known that the set pin is removed after the operation is completed, and that the pressing force of the rod is applied to the tension pulley to apply a required tension to the belt (for example, Japanese Patent Laid-Open No. 8-48).
No. 61).

[0004]

In the belt tension adjusting device as described above, the mounting posture of the auto tensioner is inclined from a normal position due to the existence of a gap between the mounting bolt of the auto tensioner and the bolt hole. When the rod is mounted, there is a certain distance between the mounting position of the auto-tensioner and the contact position of the rod with the tension pulley, so that the contact position of the rod with the tension pulley deviates from the normal position. If the contact position shifts, an eccentric load acts on the inside of the auto-tensioner, which causes a problem in tension adjustment and shortens the life of the auto-tensioner.

Accordingly, an object of the present invention is to prevent the inclination of the mounting posture of the auto tensioner by effectively utilizing the set pin.

[0006]

In order to solve the above-mentioned problems, the present invention comprises an auto-tensioner attached to a fixing member, and a tension pulley pressed by the auto-tensioner. In the belt tension adjusting device for applying a required tension, a configuration is employed in which a tip of a set pin for preventing the rod from popping out of the auto tensioner is engaged with a positioning hole provided in the fixing member.

A support arm provided on the tension pulley is swingably attached to the fixed member, and the rod of the auto tensioner is brought into contact with a part of the support arm to swing the tension pulley. The configuration described above can be adopted.

As another means for solving the above-mentioned problems, the present invention provides an automatic tensioner mounted on a fixed member, a tension pulley rotatably mounted on the fixed member by an eccentric shaft, and a tension pulley between the two. A belt that is configured to apply a required tension to the belt by applying a pressing force of the auto-tensioner to the tension pulley via the operating lever. In the tension adjusting device, a configuration is employed in which a tip of a set pin for preventing the rod from popping out of the auto tensioner is engaged with a positioning hole provided in the fixing member.

The set pin is passed through a rod pin hole provided at the tip of the rod and a cylinder pin hole provided diametrically at the tip of the cylinder, and the set pin protrudes from the peripheral wall of the cylinder. May be engaged with a positioning hole provided in the fixing member.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The belt tension adjusting device according to the first embodiment shown in FIGS. 1 and 2 comprises an auto-tensioner 1 and a tension pulley 2, and the auto-tensioner 1 is provided with a mounting portion provided on a side of a cylinder 3. 4 is fixed by fixing it to a fixing member 6 such as an engine block with two fixing bolts 5. Further, the tension pulley 2 has a support arm 7 integrally provided on the fixed side of the bearing portion 10.
The support arm 7 is swingably attached to the fixed member 6 by the attachment bolt 8. A pin 9 for contacting the auto tensioner 1 is provided on the support arm 7 in a horizontal direction.

As shown in FIG. 2, the internal structure of the cylinder 3 of the above-described auto tensioner 1 is such that a rod 11 is housed by a wear ring 12 so as to be able to advance and retreat in the center line direction. Is pressed against the wear ring 12 to urge the rod 11 in the protruding direction. A sealing member 1 is provided at the open end of the thin lid 3.
4 is attached to prevent intrusion of water, dust and the like, and prevent the rod 11 from coming off.

Although not shown, the cylinder 3
May be provided with a damper device.

A diametrically extending cylinder pin hole 15 is provided between the seal portion 14 and the open end of the cylinder 3.
A rod pin hole 16 is provided at the tip of the rod 11 so as to penetrate in the diameter direction. The positional relationship between the cylinder pin hole 15 and the rod pin hole 16 is set such that when the rod 11 is pushed in against the spring force of the tension adjusting spring 13, it is aligned in a straight line. A positioning hole 17 is provided in a portion of the fixing member 6 on the same line as the cylinder pin hole 15.

When the belt tension adjusting device having the above-described configuration is fixed to the fixing member 6, the rod 11 is pushed in advance so that the rod pin hole 16 matches the cylinder pin hole 15 to prevent the rod 11 from jumping out. Set pin 1
8, and the tip of the set pin 18 protruding from the outer peripheral surface of the cylinder 3 is inserted into the positioning hole 1 of the fixing member 6.
7 and engaged (see the solid line in FIG. 2).

When the set pin 18 is engaged with the fixing member 6, the rod 11 separates from the pin 9 and the tension adjusting spring 13 does not exert a spring force on the tension pulley 2, thereby facilitating the mounting operation. Is positioned with respect to the fixing member 6, so that even if there is a gap between the fixing bolt 5 and the bolt hole, the mounting posture of the auto tensioner 1 is maintained in a normal state.

When the mounting operation is completed, the set pin 18
Remove. Then, the rod 11 protrudes and the pin 9
2 (see the dashed line in FIG. 2), whereby the tension pulley 2 is swung about the mounting bolt 8 to apply a predetermined tension to the belt 19.

The belt tension adjusting device according to the second embodiment shown in FIGS. 3 and 4 includes an auto-tensioner 1, a tension pulley 2, and an operating lever 20 formed separately from these components.
It is composed of The auto tensioner 1 is attached to a fixing member 6 by fixing bolts 5 and 5. The internal structure of the auto-tensioner 1 is the same as in the above case. The tension pulley 2 is rotatably attached to the fixing member 6 by an attachment bolt 21 at an eccentric position. The operation lever 20 is swingably attached to the fixed member 6 by the attachment bolt 22 between the auto tensioner 1 and the tension pulley 2.

One end of the actuating lever 20 is in contact with an eccentric pin 23 projecting from the eccentric position of the tension pulley 2, and the other end of the rod 11 of the auto tensioner 1 is connected.
Is abutted. When the rod 11 advances, the operating lever 20
Is pivoted, whereby the eccentric pin 23 is pushed, and the tension pulley 2 is pivoted.

As in the first embodiment, a cylinder pin hole 15 is provided in the cylinder 3 of the auto tensioner 1, and a rod pin hole 16 is provided in the rod 11. Then, the set pin 18 is passed through these pin holes 15 and 16 at the time of assembly.
The same applies to the engagement of the distal end portion 8 with the positioning hole 17 of the fixing member 6 and the removal of the set pin 18 when the assembling operation is completed.

[0021]

As described above, according to the present invention, when attaching the belt tension adjusting device to the fixing member, the tip of the set pin used to prevent the rod of the auto tensioner from popping out is engaged with the positioning hole of the fixing member. By doing so, the auto tensioner can be mounted in a proper posture. Therefore, the position where the rod of the auto tensioner abuts on the tension pulley is maintained at the regular position, and the belt tension can be adjusted with high accuracy.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment.

FIG. 2 is a longitudinal sectional side view of the above.

FIG. 3 is a front view of a second embodiment.

FIG. 4 is a longitudinal sectional side view of the above.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 auto tensioner 2 tension pulley 3 cylinder 4 mounting part 5 fixing bolt 6 fixing member 7 support arm 8 mounting bolt 9 pin 10 bearing part 11 rod 12 bearing 13 tension adjustment spring 14 seal part 15 cylinder pin hole 16 rod pin hole 17 positioning hole 18 Set Pin 19 Belt 20 Operating Lever 21 Mounting Bolt 22 Mounting Bolt 23 Eccentric Pin

Claims (4)

[Claims] 1. A belt tension adjusting device comprising an auto tensioner attached to a fixed member and a tension pulley pressed by the auto tensioner, wherein the tension pulley applies a required tension to a belt. A belt tension adjusting device, wherein a tip end of a set pin for preventing a rod from popping out of a tensioner is engaged with a positioning hole provided in the fixing member. 2. A support arm provided on the tension pulley is swingably attached to the fixed member, and the rod of the auto tensioner is brought into contact with a part of the support arm to swing the tension pulley. 2. The belt tension adjusting device according to claim 1, wherein the belt tension is adjusted. 3. An auto-tensioner mounted on a fixed member, a tension pulley rotatably mounted on the fixed member by an eccentric shaft, and an operating lever rotatably mounted on the fixed member between the two. Become
In a belt tension adjusting device in which the pressing force of the above-mentioned auto tensioner is applied to the above-mentioned tension pulley via the above-mentioned operating lever to apply a required tension to the belt, a set pin for preventing the rod from popping out of the above-mentioned auto tensioner is provided. A belt tension adjusting device, wherein a tip portion is engaged with a positioning hole provided in the fixing member. 4. The cylinder according to claim 1, wherein said set pin is passed through a rod pin hole provided at a tip of said rod and a cylinder pin hole provided in a diameter direction at a tip of said cylinder, and protrudes from a peripheral wall of said cylinder. The belt tension adjusting device according to any one of claims 1 to 3, wherein a tip end of the set pin is engaged with a positioning hole provided in the fixing member.