KR101716554B1 - Auto-tensioner - Google Patents

Abstract

In the present invention, an upper portion is opened and a press-fit hole A tensioner arm having a base and an insertion hole formed at one side thereof so as to communicate with a press-fit hole of the base and rotatably coupled to the upper portion of the base, and a tensioner arm rotatably coupled to the other side of the tensioner arm via a pulley bolt A tensioner spring fixed to the inside of the base and having an opposite end fixed to the inside of the tensioner arm to provide an elastic restoring force against the rotation of the tensioner arm with respect to the base; A press-fit portion formed with a knurled portion having a larger diameter than the press-fit hole inner diameter of the base so as to be press-fitted into the press-fit hole of the base and to increase the contact friction force with the press-fit hole is formed, And a body inserted into the insertion hole of the tensioner arm is provided between the press-in portion and the flange portion, Is formed relates to the auto tensioner comprising an pivot shaft for rotatably coupling said tensioner arm relative to said base.

Description

Auto Tensioner {AUTO-TENSIONER}

The present invention relates to an auto tensioner for automatically adjusting the tension of a belt connected to an engine of a vehicle.

BACKGROUND ART Generally, a vehicle includes a timing belt for connecting a crankshaft to a compressor or the like of a camshaft or an air conditioner for driving a driving system (front accessory drive system) of a variety of auxiliary machine devices (or other types) by using a rotational power of a crankshaft, And a fan belt for connecting the various kinds of belts.

The various types of belts transmit a driving force of a crankshaft which is a driving shaft to a driven shaft, a driving pulley is installed on a crankshaft for transmitting power, and a driven pulley is provided on a driven shaft. And the drive pulley and the driven pulley are connected by a belt flow.

However, the belt may be stretched due to long-term use or vibration of the vehicle body, and may fail to perform its function.

To this end, an automatic tensioner (AUTO-TENSIONER) is provided to automatically tension the belt so that the driving force of the driving pulley can be accurately and effectively transmitted to the driven pulley with a predetermined tension.

This auto tensioner keeps the tension of the belt constant, satisfying the engine belt drive system noise reduction, life extension and engine reliability.

As shown in FIGS. 1 to 3, the auto tensioner according to the related art is generally constructed such that an upper portion thereof is opened and a first insertion hole 11 is formed through the center thereof A tensioner arm 20 rotatably coupled to an upper portion of the base 10 through a second insertion hole 21 communicating with the first insertion hole 11 of the base, , A tensioner pulley (30) coupled to the other side of the tensioner arm (20) through a pulley bolt (31) so as to be freely rotatable, one end fixed to the inside of the base (10) A tensioner spring 40 fixed to the inside of the arm 20 to provide an elastic restoring force against the rotation of the tensioner arm 20 with respect to the base 10 and a tensioner spring 40 fixed to the base 10, A pivot shaft 50 for rotatably coupling the arm 20 and an upper plate 60 mounted on the upper portion of the pivot shaft 50 by staking. Although not shown in the drawing, fastening protrusions and fastening grooves are formed on the contact surfaces of the upper plate 60 and the tensioner arm 20 so that the upper plate 60 can be staked by the tensioner arm 20 As shown in Fig.

Also in the case of the auto tensioner of the patent document (Korean Patent Laid-Open No. 2010-0016085), the upper plate 60 is placed on the upper part of the pivot shaft 50 and then the upper plate 60 is staked Is mounted on the pivot shaft (50).

However, as described above, in the conventional auto tensioner, since the pivot shaft 50 is inserted and fixed to the base 10 and the tensioner arm 20 by the upper plate 60, the assembling process is complicated and increases the number of parts do. Since the manufacturing process for forming the fastening means between the upper plate 60 and the tensioner arm 20 is required, the manufacturing cost is increased. Since the pivot shaft 50 is simply press-fitted into the first insertion hole 11 of the base 10 depending on the upper plate 60, the vibration transmitted from the belt and the rotation of the tensioner arm 20 cause the pivot The upper plate 60 can be detached from the tensioner arm 20 by weakening the fastening strength between the upper plate 60 and the tensioner arm 20 while the shaft 50 continuously impacts the upper plate 60 . As a result, there is a problem that the pivot shaft 50 may be detached from the base 10 and the tensioner arm 20, resulting in a serious failure.

SUMMARY OF THE INVENTION It is an object of the present invention, which is devised to solve the above-described problems, to provide an automatic tensioner that simplifies the assembling process between parts, reduces the number of parts, So that the occurrence of a failure can be prevented at the source.

In order to achieve the above object, the auto tensioner of the present invention is characterized in that an upper portion thereof is opened and a press-fit hole A tensioner arm having a base and an insertion hole formed at one side thereof so as to communicate with a press-fit hole of the base and rotatably coupled to the upper portion of the base, and a tensioner arm rotatably coupled to the other side of the tensioner arm via a pulley bolt A tensioner spring fixed to the inside of the base and having an opposite end fixed to the inside of the tensioner arm to provide an elastic restoring force against the rotation of the tensioner arm with respect to the base; A press-fit portion formed with a knurled portion having a larger diameter than the press-fit hole inner diameter of the base so as to be press-fitted into the press-fit hole of the base and to increase contact friction with the press-fit hole is formed, And a body inserted into the insertion hole of the tensioner arm is provided between the press-in portion and the flange portion, Is formed is characterized in that comprising an pivot shaft for rotatably coupling said tensioner arm relative to said base.

The press-fit portion of the pivot shaft is characterized in that a taper having a diameter smaller than the inner diameter of the press-fit hole of the base is formed on the outer peripheral surface of the lower end gradually.

Further, the press-fitting portion of the pivot shaft is formed into a knurled ring selected from among linear, quadratic, or lattice-shaped knurling, and the press-fit hole of the base includes a knurled- Is machined.

The base includes a protrusion fixing groove formed in the inner circumferential surface of the press-fit hole. The press-in portion of the pivot shaft has a protruding groove formed in the outer circumferential surface to correspond to the protrusion fixing groove of the base. A protrusion protrusion which is inserted into the protrusion fixing groove when the press-in portion of the pivot shaft is press-fitted into the press-fitting hole of the base, and a push-out spring provided inside the push- Further comprising:

Since the auto tensioner according to the present invention is first press-fitted or inserted into the base and the tensioner arm without the upper plate constituting the conventional auto tensioner through the pivot shaft having the press-in portion, the flange portion and the body portion, The assembling process between the parts is simplified, and the number of parts is reduced, thereby reducing the manufacturing cost.

Second, the contact friction force between the pivot shaft and the base is increased through the press-fitting portion of the knurled pivot shaft, so that the occurrence of a failure in which the pivot shaft is separated from the base can be prevented originally.

Third, there is an effect that the contact friction force between the pivot shaft and the base can be further increased through the press fitting knurling of the pivot shaft and the press fitting hole knitting of the base respectively processed in the opposite direction.

Fourth, the effect that the pivot shaft can be press-fitted into the press-fit hole of the base through the press-fit hole of the base on which the projection fixing groove is formed, the press-in portion of the pivot shaft formed with the push- .

1 is a perspective view showing an auto tensioner according to the prior art,
Figure 2 is an exploded side view of the embodiment of Figure 1,
Figure 3 is a side cross-sectional view of the embodiment of Figure 1,
4 is a perspective view showing a first embodiment of the auto tensioner according to the present invention,
Figure 5 is an exploded side view of the embodiment of Figure 4,
Figure 6 is a side cross-sectional view of the embodiment of Figure 4,
Figure 7 is a side view of the pivot shaft of the embodiment of Figure 4,
Figs. 8 and 9 are side cross-sectional views showing the process of press-fitting the pivot shaft into the base of the embodiment of Fig. 5,
FIG. 10 is a side sectional view showing another embodiment of the base of FIG. 5,
11 is an exploded side view showing a second embodiment of the auto tensioner according to the present invention,
Fig. 12 is an engaging side sectional view of the embodiment of Fig. 11,
13 is a side sectional view showing the base of the embodiment of Fig. 11,
Fig. 14 is a side view showing the pivot shaft in the embodiment of Fig. 11,
Figure 15 is a side cross-sectional view of the embodiment of Figure 14,
16 and 17 are side cross-sectional views illustrating a process of press-fitting the pivot shaft into the base of the embodiment of FIG.

Hereinafter, a preferred embodiment of the auto tensioner according to the present invention will be described in detail with reference to the accompanying drawings.

4 to 10, a tensioner arm 200, a tensioner pulley 300, a tensioner spring 400, a pivot shaft 500, a tensioner arm 200, .

4, 5, 6 and 8, the upper portion of the base 100 is opened, and the press-in hole 110 is formed at the center thereof. A guide groove 120 for accommodating the guide protrusion 230 of the tensioner arm 200 to be described later is formed in a side surface of the tensioner spring 400 and a space in which a tensioner spring 400 The fixing protrusions may be formed.

4 to 6, the tensioner arm 200 has an insertion hole 210 formed at one side thereof to communicate with the press-fit hole 110 of the base 100, Lt; / RTI > A pulley coupling hole 220 for coupling a tensioner pulley 300 to be described later is formed on the other side and a pulley coupling hole 220 for coupling the tensioner pulley 300 to be described later is formed in the guide groove 130 of the base 100 so as to be rotatably guided with respect to the base 100 The guide protrusion 230 is protruded. In addition, a space for accommodating the tensioner spring 400 to be described later is provided therein, and a fixing protrusion for fixing the other end of the tensioner spring 400 may be formed.

4 to 6, the tensioner pulley 300 is freely rotatably coupled to the other side of the tensioner arm 200 through a pulley bolt 310, and is configured to prevent foreign substances such as dust from entering the interior of the tensioner pulley 300 When the pulley bolts 310 are fastened, the foreign matter prevention cap 320 is put on. A bearing (330) is fixedly installed inside the tensioner pulley (300) so as to freely rotate. Here, although not shown, the tensioner pulley 300 presses the belt inward to keep the tension of the belt constant, and freely rotates together by driving the belt. The belt includes a timing belt, a fan belt, and the like for driving a drive system of a vehicle as described in the background art.

4 to 6, one end of the tensioner spring 400 is fixed to the inside of the base 100 and the other end of the tensioner spring 400 is fixed to the inside of the tensioner arm 200, To provide an elastic restoring force against rotation of the tensioner arm (200). That is, the tensioner spring 400 provides an elastic restoring force against the external force applied to the tensioner pulley 300 due to the belt driving to the tensioner arm 200 and controls the tensioner arm 200 and the tensioner arm 200 so that the tension of the belt is kept constant. So that the tensioner pulley 300 coupled thereto is deflected.

5 and 6, the base 100 is provided with a spring support 410 for supporting the tensioner spring 400.

4 to 7, a pivot shaft 500 is formed at a lower end of the pivot shaft 500 so as to be press-fitted into the press-in hole 110 of the base 100, A press-fit portion 510 having a knurling 511 formed to increase the frictional force of contact with the press-fit hole 110 is formed. A flange portion 520 for supporting the upper surface of the tensioner arm 200 is formed on an upper end of the flange portion 520 and a flange portion 520 is formed between the press-in portion 510 and the flange portion 520. In the insertion hole 210 of the tensioner arm 200, A body 520 to be inserted is formed to rotatably couple the tensioner arm 200 with respect to the base 100.

7 and 8, the press-fit portion 510 of the pivot shaft 500 has a diameter d2 larger than the press-fit hole inner diameter d1 of the base 100, A taper 512 having a diameter smaller than the inner diameter of the press-fit hole 110 of the base 100 and gradually increasing in diameter is formed. This allows the pivot shaft 500 to be easily press-fitted into the press-fit hole 110 of the base 100 having the inner diameter d1 smaller than the diameter d2 of the press-in portion 510 of the pivot shaft 500, The press-fit portion 510 of the pivot shaft 500 is firmly fixed to the press-fit hole 110 of the base 100 to prevent the rotation of the pivot shaft 500 and maintain the state. At this time, the knurling 511 is machined on the press-fit portion 510 of the pivot shaft 500, so that the contact friction force of the base 100 with the press-fit hole 110 can be increased. Here, in the field of machining, knurling refers to a machining process in which the outer surface of a workpiece having a cylindrical shape is roughly formed in a shape of a straight line, a straight line, a straight line, or a lattice shape so as not to slip.

The straight bushing 540 and the flange bush 550 are inserted into the insertion hole 210 of the tensioner arm 200 in the body 530 of the pivot shaft 500. This is to minimize rotational friction and rotational vibration between the insertion hole 210 formed through the tensioner arm 200 rotating with respect to the base 100 and the body portion 530 of the pivot shaft 500.

A shaft hole 560 is formed at the center of the pivot shaft 500 so that the press-fit portion 510 can be pushed inward to be easily press-fit into the press-fit hole 110 of the base 100 Respectively.

8 and 9 are side cross-sectional views showing a process of pushing the pivot shaft 500 into the base 100 of the first embodiment of the auto tensioner according to the present invention, The description thereof will be omitted.

The press-fitting portion 510 of the pivot shaft 500 is formed into a knurled 511 selected from a linear, quadratic, or lattice type knurling. The knurled ring 111 of the pivot shaft 500 may be machined in a direction opposite to the knurled 511 formed in the press-fit portion 510 of the pivot shaft 500 as shown in FIG. For example, when the knurled 511 machined in the press-in portion 510 of the pivot shaft 500 is a vertical linear knurling as shown in FIG. 7, the insertion hole 110 of the base 100 is provided with a horizontal straight- (111) can be machined, which has the effect of further increasing the contact friction between the base (100) and the contact surface of the pivot shaft (500).

Therefore, the pivot shaft 500 having the press-in portion 510, the flange portion 520 and the body portion 530 is press-fitted into the base 100 and the tensioner arm 200 without the upper plate, which is constituted in the conventional auto- So that the assembling process between the parts is simplified and the number of parts is reduced, so that the manufacturing cost is reduced.

The knurling 511 increases the contact friction force between the pivot shaft 500 and the base 100 through the press fitting portion 510 of the processed pivot shaft 500 so that the pivot shaft 500 is separated from the base 100 There is an effect that the occurrence of a failure can be originally prevented.

The pivot shaft 500 and the base 100 are fixed to each other through the knurling 511 of the pivot shaft 510 and the press fitting hole 110 of the base 100, ) Can be further increased.

11 to 17, the tensioner arm 200, the tensioner pulley 300, the tensioner spring 400, the pivot shaft 500, the tensioner arm 200, A convex projection 600, and a draw-out spring 700. [ Particularly, the base 100 and the press-fitting portion 510 of the pivot shaft differ in the construction and operation of the first embodiment from the first embodiment, and further include the projection fixing groove 112 and the inlet / outlet slot 513 . However, the description of the components described in detail in the first embodiment will be omitted.

12 and 13, the base 100 in the second embodiment is formed with a protrusion fixing groove 112 formed in the inner circumferential surface of the press-fit hole 110 so that the convex protrusion 600 to be described later can be inserted and fixed have.

The push-in portion 510 of the pivot shaft 500 is formed with a push-out groove 513 on the outer circumferential surface to correspond to the protrusion fixing groove 112 of the press-fit hole 110, as shown in FIGS. The convex projection 600 and the draw-out spring 700 to be described later are installed in the draw-

11, 12, 14 and 15, the convex protrusions 600 are provided so as to be capable of being pulled out from the push-out grooves 513 of the press-in portion 510, and the push-in portions 510 of the pivot shaft 500 Is inserted into the protrusion fixing groove 112 when the press-fitting hole 110 is press-fitted into the press-fitting hole 110 of the base 100.

15, the inlet / outlet spring 700 is installed inside the inlet / outlet slot 513, and one end thereof is fixedly installed in the inlet / outlet slot 513 so as to provide a spring force to the convex protrusion 500 And the other end is fixed to the convex projection 500.

16 and 17 are side cross-sectional views showing a process of pushing the pivot shaft 500 into the base 100 of the second embodiment of the auto tensioner according to the present invention, It is confirmed that the convex protrusion 600 is inserted and fixed in the protrusion fixing groove 112 formed in the recess 100 and the press fitting portion 510 of the pivot shaft 500 is fastened to the press-fitting hole 110 of the base 100.

Therefore, the press-in hole 110 of the base 100 on which the protrusion fixing groove 112 is formed, the press-in portion 510 of the pivot shaft 500 in which the push-out groove 513 is formed, the convex projection 600, The pivot shaft 500 can be press-fitted into the press-fit hole 110 of the base 100 and can be more firmly fastened.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

100: Base
110: press-fit hole 120: guide groove
200: tensioner arm 210: insertion hole
220: pulley coupling hole 230: guide projection
300: tensioner pulley 310: pulley bolt
320: Foreign matter prevention cap 330: Bearing
400: tensioner spring 410: spring support
500: Pivot shaft
510: press-in portion 520: flange portion
530: body portion 540: straight bush
550: Flange Bush 560: Shaft hole
600: convex projection
700: draw-in spring

Claims (4)

A base having an upper portion opened and a press-fit hole penetratingly formed at an inner center thereof,
A tensioner arm having an insertion hole formed at one side thereof to communicate with a press-fit hole of the base and rotatably coupled to an upper portion of the base,
A tensioner pulley rotatably coupled to the other side of the tensioner arm via a pulley bolt,
A tensioner spring fixed at one end to the inside of the base and fixed at the other end inside the tensioner arm to provide an elastic restoring force against rotation of the tensioner arm with respect to the base,
A lower end of which is formed with a knurled portion having a larger diameter than the press-in hole inner diameter of the base so as to be press-fitted into the press-in hole of the base, And a flange portion is formed between the press-fit portion and the flange portion, and a body portion to be inserted into the insertion hole of the tensioner arm is formed between the press-fit portion and the flange portion. When the press- And a pivot shaft rotatably coupling the tensioner arm with respect to the base,
Wherein the press-fitting portion of the pivot shaft includes:
And is processed into any one of the knurls selected from the linear, quadratic, or lattice type knurling,
The press-fit hole of the base includes:
Knurling in a direction opposite to the knurling machined in the press-in portion of the pivot shaft is machined,
The base includes:
A projection fixing groove is formed in the inner peripheral surface of the press-fit hole so as to be recessed,
Wherein the press-fitting portion of the pivot shaft includes:
An inlet and an outlet are formed on the outer circumferential surface so as to correspond to the projection fixing grooves of the base,
A protruding protrusion which is inserted into and out of the pushing-in portion of the press-fitting portion and inserted into the protrusion fixing groove when the press-fitting portion of the pivot shaft is press-fitted into the press-
Further comprising a draw-out spring provided inside the draw-in groove to provide a spring force to the convex projection,
Wherein the press-fitting portion of the pivot shaft includes:
And a tapered portion having a diameter smaller than the inner diameter of the press-fit hole of the base and gradually increasing in diameter is formed on the lower outer circumferential surface. delete delete delete

Images