JPS601317Y2 - tensioner - Google Patents

Description

[Detailed explanation of the invention] This invention consists of flat belts, timing belts, flat belts,
The present invention relates to a tensioner used in a transmission device using a transmission strip such as a wire rope.

Conventionally, tensioners for automobiles, for example, have a bearing ring member 1 having an inner raceway, as shown in FIGS. 1 and 2.
1a and a pulley member 12a fitted thereto and in contact with the belt 8a, which is the rotating side outer member 1a, a track member 22a having an outer track, and a holding member 23a holding the outer track member 22a. an inner member 2a that is fixed to the base 9a; the outer member 1a and the inner member 2;
A tensioner is known that has a plurality of rolling elements 3a between the base 9a or the inner member 2a, and this tensioner has a pin 10a fixed to the support 7a at a position different from the axis of the base 9a or the inner member 2a. The force of a tension spring 6a which is swingably supported as a center, has one end fixed to a locking portion 91a of the base 9a, and the other end fixed to the support body 7a, and the outer member 1
By fixing the base 9a to the support body 7a with the fixing bolts 4a at a position where the component of the tension of the belt 8a in contact with the pulley member 12a of a is balanced, an appropriate tension is applied to the belt 8a. attached to give.

However, when installing such a conventional tensioner, the base 9a, the bottle 10a,
In addition to requiring space for the tension spring 6a, etc.
If the above-mentioned parts are not placed properly, it will not be possible to give the appropriate tension to the belt. Therefore, when various mechanisms must be arranged compactly in a small space such as in automobiles, there are many problems in the layout design and assembly. It was difficult.

The purpose of this invention is to eliminate the above-mentioned problems and provide a lighter tensioner with fewer parts than before.

Next, an embodiment of the tensioner of this invention will be explained with reference to FIGS. 3 to 11. 1 is a rotating outer ring member, 2 is a fixed inner member, and 3 is a link between the outer member 1 and the inner member 2. The inner member 2 is a rolling element located between the inner member 2 and the inner member 2, which has a hollow shaft shape and has a bottom wall 21 at one end on the side opposite to the support body (here, one end includes a portion inside the end surface). The bottom wall 21 has an eccentric positioning hole 211 for fixing and position adjustment, which is located at a position offset from the axis of the inner member 2 and through which the fixing bolt 4 is passed.

5 is a seal body of the tensioner, 6 is a spring body which is a torsion coil spring, 7 is a support body to which the tensioner is attached by the fixing bolt 4, and 8 is a belt.

FIG. 3 shows a first embodiment of the tensioner of this invention, in which the outer member 1 is formed from one member having an inner raceway 13 on which the rolling elements 3 roll, and the inner member 2 is formed of a bearing ring member 22 having an outer raceway 24 and a holding member 23 that fits into the inner surface of the bearing ring member 22 and holds it. It has a shoulder 231 against which one end 222 of the raceway ring member 22 having the raceway 24 abuts.

The holding member 23 has a hollow shaft shape having the bottom wall 21, and inside thereof, one end 61 on the bottom wall 21 side is engaged with the holding member 23, and the other end 62 is engaged with the support body 7. It has a torsion coil spring 6 which can be locked to the portion 71.

In addition to the eccentric position hole 211, the bottom wall 21 has an engagement hole 212 for a mounting tool.

When attaching the tensioner thus configured to the support 7 and adjusting the tension of the belt 8, the other end 62 of the torsion coil spring 6 of the support 7
As shown in FIG. In the state in which the belt 8 is not in use, the belt 8 is provided so as to pass through an area that is more inward than the outer circumferential surface of the outer member 1.

Next, the other end 62 of the torsion coil spring 6 is locked to the locking portion 71 of the support body 7, and the fixing holt 4
is passed through the eccentric position hole 211 of the bottom wall 21 and screwed into the screw hole 72 of the support body 7, and the fixing bolt 4 is screwed into the screw hole 72 of the support body 7.
If the belt 8 is brought into contact with the outer circumferential surface of the outer member 1 without being tightened, the tensioner will cause the torsion due to the pressing force F on the tensioner caused by the tension T of the belt 8, as shown in FIG. The moment around the fixing bolt 4 due to the pressing force F is balanced with the moment M due to the return force of the torsion coil spring 6. It stops.

In this state, for example, as shown in FIG.
1 and a rotating shaft 103 having a hexagonal end 102, the fixing pin 101 of the mounting tool 100 is inserted into the engagement hole 212 of the bottom wall 21, and the hexagonal end 102 is inserted into the hexagonal hole 41 of the fixing bolt 4. the rotating shaft 10.
3, the inner member 2 will not rotate and only the fixing bolt 4 will be screwed in, and the tensioner will be fixed in the balanced state.

Therefore, if the moment due to the return force of the torsion coil spring 6 in the balanced state is properly designed and manufactured, the tensioner can be fixed in a state where the desired tension is applied to the belt 8.

FIG. 7 shows a second embodiment of the tensioner of this invention, in particular, a torsion coil spring 6 has one end 61 of which has an end 222 of a bearing ring member 22 having an outer raceway 24 and an end 223 of the opposite end 222 of the bearing ring member 22 having an outer raceway 24. protrudes from the outer circumferential surface of the holding member 23 adjacent to the bearing member 23, thereby restricting movement of the bearing ring member 22 in the axial direction.

Further, the outer member 1 is formed of a raceway member 11 having an inner raceway 13 and a pulley member 12 that is fitted onto the outer peripheral surface of the raceway member 11 and comes into contact with the belt.

FIG. 8 shows a third embodiment of the tensioner of this invention, in particular, the inner member 2 is assembled with a raceway member 22 having an outer raceway 24 and a holding member 23 as in the first and second embodiments. It is constructed from a single member having an outer track 24 without being constructed from.

FIG. 9 shows a fourth embodiment of the tensioner of this invention, in which the inner member 2 is a raceway member 2 having an outer raceway 24.
2 and a holding member 23 that fits into the inner surface of the bearing ring member 22 and holds it, and the holding member 23 does not have a shoulder portion as in the first embodiment, and in particular, the torsion coil One end 61 of the spring 6 includes a protruding portion 611 that protrudes from the outer peripheral surface of the coil following the winding end of the coil, an intermediate portion 612 that extends in the axial direction from the center axis of the coil at the same distance as the radius of the coil, and and a subsequent radially outwardly extending terminal portion 613, the protruding portion 611 being adjacent to one end 222 of the raceway member 22 with the outer raceway 24, and the terminal portion 61
3 are adjacent to the end 223 opposite to the one end 222 of the bearing ring member 22 having the outer raceway 24 and protrude from the outer circumferential surface of the holding member 23, thereby holding the outer raceway 24. Movement of the bearing ring member 22 in the axial direction is restricted.

FIG. 10 shows a fifth embodiment of the tensioner of this invention, in which the outer member 1 is formed from one member having an inner raceway 13 on which the rolling elements 3 roll, and the inner member 2 is formed from an outer member. The spring body 6 is formed from one hollow shaft-like member having a square track 24, and the spring body 6 has one end 61 as shown in FIG.
and the other end 62 are both helical springs extending long from the coil, the one end 61 is locked with the inner member 2, and the other end 62 is locked with a locking part 71 of the support body 7. .

In this fifth embodiment, the number of parts is small, the structure is simple, and the weight is further reduced.

As described above, in the tensioner of this invention, a fixing bolt is passed through an eccentric positioning hole for fixing and position adjustment provided in the bottom wall of a hollow shaft-shaped inner member to be fixed.
It is configured to be fixed to the support body by screwing it into a screw hole of the support body, and one end on the bottom wall side is engaged with the inside member in the hollow interior of the inner member,
The other end has a spring body that can be locked with a locking part of a support body to which the tensioner is attached, and the tensioner itself is sometimes attached to a transmission strip body that comes into contact with an outer ring member rotated by the spring body. Since the tensioner is applied to the tensioner, there is no need for a conventional board or tension spring, and the space required to install the tensioner is small, and the spring body does not need to be placed between the parts. The layout design and assembly are extremely easy.

In the above embodiment, the inner member has an engagement hole for a mounting tool in the bottom wall, but the engagement hole may be located in a part other than the bottom wall of the inner member.
Further, the outer circumferential surface of the inner member may be shaped so that a mounting tool such as a spanner can be used.

Furthermore, if the free length of the torsion coil spring is set so that the fixing bolt is tightened and the torsion coil spring is compressed, the force that acts to unwind as the torsion coil spring is compressed can be used. or by other means such that the inner part does not rotate when tightening the fixing bolt, the element for the mounting tool can be omitted.

Further, in the above embodiments, the spring body is a torsion coil spring, but it may be any spring body that generates a moment around the fixing bolt, and is not particularly limited to a torsion coil spring.

In addition, detailed structures such as the type of bearings are not limited to the embodiments, and may be modified as appropriate within the scope of the claims.

[Brief explanation of drawings]

Fig. 1 is a partially longitudinal side view showing a conventional tensioner, Fig. 2 is an explanatory view showing the installation state of the conventional tensioner, and Fig. 3 is a longitudinal side view showing the first embodiment of the tensioner of the present invention. , FIGS. 4 and 5 are explanatory diagrams showing the relationship between installing the tensioner shown in FIG. 3, FIG. 6 is an explanatory diagram showing the work for installing the tensioner shown in FIG. 10 is a view corresponding to FIG. 3 showing second to fifth embodiments of the tensioner of this invention, and FIG. 11 is a front view of the spring body of the tensioner shown in FIG. 10. In the symbols in the drawing, 1 is an outer member, 2 is an inner member, 3 is a rolling element, 4 is a fixing bolt, 6 is a spring body, 7 is a support body, 8 is a transmission strip, and 11 is an inner raceway. The bearing ring member 12 is a pulley member, 21 is a bottom wall, 22 is a bearing ring member having an outer raceway, and 23 is a holding member.

Claims (1)

[Claims for Utility Model Registration] (1) A rolling element is provided between an outer member that rotates in contact with the transmission strip and an inner member that is fixed to a support body, and the inner member has a rolling element that rotates from its axis. In a tensioner having an eccentric position hole for fixing and position adjustment through which a fixing bolt is passed through at a displaced position, the inner member has at one end on the side opposite to the support body,
It has a hollow shaft shape with a bottom wall having an eccentric positioning hole for fixing and position adjustment, and in the hollow interior of the inner member, one end on the bottom wall side is engaged with the inner member, and the other end is a tensioner. It has a spring body that can be locked with a locking portion of the support to be attached, and the tensioner is sometimes attached so that the spring body applies a desired tension to the transmission strip in contact with the outer member. Tensioner (2) Utility Model Registration A tensioner according to claim 1, wherein the outer member is formed from a single member having an inner raceway on which the rolling elements roll. (3) Utility model registration Claims In the tensioner according to claim 1, the outer member includes a raceway member having an inner raceway on which the rolling elements roll, and a pulley member fitted thereto and in contact with the transmission strip. Tensioner being formed. (4) Utility model registration Claims A tensioner utility model according to any one of claims 1, 2, and 3, in which the inner member is formed from one member having an outer track. The tensioner according to any one of registered claims 1, 2, and 3, wherein the inner member is formed of a raceway member having an outer raceway and a holding member that holds the raceway member. . (6) The tensioner according to claim 5 of the utility model registration, wherein the tensioner has a shoulder portion on which one end of the bearing ring member having the outer raceway comes into contact with the holding member. (7) Utility Model Registration In the tensioner according to claim 5 or 6, the movement of the raceway ring member having the outer raceway in the axial direction is restricted by a part of the spring body. There is a tensioner. (8) Scope of Utility Model Registration Claims In the tensioner according to any one of claims 1, 2, 3, 4, 5, 6, and 7, the spring body is a coil spring. is the tensioner