KR20170085636A - Belt tesioner - Google Patents

Abstract

The present invention relates to a belt tensioner that provides tension to a timing belt or a drive belt in a belt drive system of an engine, the belt tensioner including an eccentric adjustment portion, a pivot arm, a pulley, a base plate, and a torsion spring, And a bolt hole is formed through the flange from one end to the other end so as to be eccentric from the rotation center axis, and a bolt hole is formed in the bolt hole A sleeve inserted into the engine mounting surface and having a cylindrical shape, one end of which is inserted through the other end of the sleeve to the lower flange of the sleeve so as to pierce the inner circumferential surface of the bush, and a step- And a ring insertion groove formed at the other end of the sleeve in the form of a C cut ring, And, it is engaging the catching projection of the pivot shaft and wherein the shaft comprises a fixing ring for fixing to avoid leaving the sleeve and the pivot shaft in the longitudinal direction.

Description

Belt tensioner {BELT TESIONER}

The present invention relates to a belt tensioner that provides tension to a timing belt or a drive belt in a belt drive system of an engine.

Generally, an automobile engine uses a belt drive type that connects a belt and a crankshaft for driving an engine flow (a generator, an air compressor, a power pump, a water pump, etc.).

BACKGROUND ART Generally, a belt used in an engine portion of a vehicle is a power transmission means used for driving a pulley of each engine type by the power of a crankshaft pulley when an engine is driven. If the belt is instantaneously loosened by the acceleration / deceleration due to the variation of the rotation speed, the power transmission efficiency is lowered.

Therefore, in order to prevent this, a separate belt tensioner, that is, a tension adjusting device of the belt, is provided on the belt located at the longest interval between the pulleys. The belt tensioner, which is the belt tensioner, keeps the belt always tensioned, thus preventing power loss and providing the best driving conditions.

There are various types and operating modes of the belt tensioner, such as a conventional type having a fixed structure and a pivot structure eccentrically mounted on the fixed structure by the pivot assembly, Has a pulley rotatably mounted on the pivot structure. The torsion spring surrounds the pivot assembly and provides a spring force to the pivot structure towards the belt tightening direction. The spring force of the torsion spring decreases as the pivot structure moves from the belt relaxation direction to the belt tightening direction. Despite this change in spring force with respect to the range of motion of the belt tensioner, a substantially constant belt tension is maintained by the tensioner, which describes the basic principle in U.S. Patent No. 4,473,362.

Various conventional techniques are currently used to suitably mount a belt tensioner on an engine, for example, a belt tensioner with a mounting pin of Japanese Patent Application Laid-Open No. 10-2004-0030881, a belt tensioner with a mounting pin of Japanese Patent Application Laid-Open No. 10-2014-0010460, Tensioner ", and " tensioner " of Patent Application Publication No. 10-2009-0115806. Such prior art is a tensioner having an eccentric adjustment portion formed as a part of a fixed structure wherein the eccentric adjustment portion is rotated about a fixing bolt coupled to the engine mounting surface so that the tensioner is moved away from or toward the belt . The mounting procedure of the tensioner includes the steps of mounting the tensioner on the engine mounting surface with the eccentric regulating portion at the farthest position from the belt, advancing the belt toward the inside of the driving system, and moving the tensioner in the nominal operating position, Rotating the eccentric adjustment portion toward the belt until the torsion spring reaches the belt tightening position, fixing the tensioner with the fixing bolt, and releasing the spring force of the torsion spring from the belt relaxation direction to the belt tightening direction.

In order to perform each of these steps, the pivot structure must be moved as far as possible in the belt loosening direction at the time of manufacturing. For this, the same structure as the temporary fastening structure is required. However, in the case of the belt tensioner according to the related art, the temporary tightening structure or the like is formed by penetrating the eccentric adjusting portion and the pivoting structure in the longitudinal direction, or a separate structure is formed and fastened. There is a problem that the manufacturing process is complicated as well as the production cost is increased even in the manufacture and installation. Particularly, there is a problem that it is very difficult to assemble and disassemble each component by the permanent fastening method such as caulking under such a structure.

SUMMARY OF THE INVENTION It is an object of the present invention, which has been devised to solve the above-mentioned problems, to provide a pivot shaft for a pneumatic tire, wherein a coupling between a sleeve and a pivot shaft of a eccentric- The belt tensioner can be easily manufactured, assembled, and disassembled by keeping the arm in the belt relaxation direction.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

In order to achieve the above object, a belt tensioner according to the present invention is a belt tensioner for providing tension to a timing belt or a drive belt in an engine belt driving system, the belt tensioner comprising: a belt tensioner mounted on the engine mounting surface, An eccentric adjustment portion adjustable in a belt retraction direction that is away from the tightening direction and the belt tightening direction; a pivot arm provided to be eccentrically pivotally movable through a cylindrical bush in an outer circumferential direction of the eccentric adjustment portion; A base plate having a pulley for performing rotational motion through a bearing, a base plate having a ring-shaped engaging and fixing rib formed on an outer circumferential surface thereof so as to be engaged with the engine mounting surface, and a pivot arm provided between the base plate and the pivot arm, And a torsion spring for providing a spring force so as to face the belt tightening direction, A ring insertion groove having a C cut ring shape is formed in the outer peripheral surface of the other end, and a bolt hole is formed through the flange from one end to the other end so as to be eccentric from the rotation center shaft, A sleeve inserted into the bolt hole through which a fixing bolt is inserted and mounted on the engine mounting surface, and a sleeve having one end inserted into a lower portion of the flange of the sleeve through the other end of the sleeve so as to disturb the outer circumferential surface of the inner circumferential surface of the bush, And a ring insertion groove formed at the other end of the sleeve in the shape of a C cut ring and is engaged with and fixed to the engagement jaw of the pivot shaft so that the sleeve and the pivot shaft are rotated in the longitudinal direction And a shaft retaining ring for retaining the shaft retaining ring.

The pivot arm may include an indicator protruding in an outer circumferential direction so as not to interfere with the pulley and a stopper rib protruding adjacent to the indicator and having a pin insertion hole formed therethrough, Wherein the eccentric relaxation rib is formed with an elongated pin insertion slit corresponding to the pin insertion hole of the stopper rib, and the pivot arm is connected to the base plate fixed to the engine mounting surface, And a stopper pin inserted into the pin insertion hole of the stopper rib and the pin insertion slit of the base plate to hold the pivot arm in the eccentrically pivoting direction in the belt relaxation direction when the eccentric pivot is made in the belt relaxation direction .

The stopper pin is released from the pin insertion hole of the base plate and the pin insertion hole of the stopper rib, and the pivot arm pivots in the belt tightening direction to provide tension to the belt.

The thrust washer further includes a thrust washer interposed between the flange of the sleeve and the pivot arm, and a spring support interposed between the base plate and the torsion spring to support the torsion spring.

The belt tensioner according to the present invention has a simple structure through a shaft fixing ring of a C cut ring shape in the final assembling step and the coupling between the sleeve of the eccentric adjusting portion and the pivot shaft. The eccentric loosening ribs and the stopper pins, which are protruded in the outer circumferential direction of the pulleys, to facilitate the manufacture, assembly and disassembly of the belt.

1 is a perspective view showing a state in which a belt tensioner according to the present invention is mounted on an engine mounting surface after completion of final assembly,
Figure 2 is a plan view of the embodiment of Figure 1,
3 is a cross-sectional view taken along line A-A 'of FIG. 2,
Fig. 4 is a perspective view showing a state before the embodiment of Fig. 1 is final assembled and mounted on the engine mounting surface,
FIG. 5 is an exploded perspective view of the embodiment of FIG. 4,
FIG. 6 is a side view showing a state in which a shaft fixing ring is coupled to a sleeve in the embodiment of FIG. 5,
Figure 7 is a bottom view of the embodiment of Figure 6,
8 is a side view showing a state in which the sleeve, the shaft fixing ring, and the pivot shaft are combined in the embodiment of FIG. 5,
Figure 9 is a bottom view of the embodiment of Figure 8,
Figure 10 is a side cross-sectional view of the embodiment of Figure 8,
11 and 12 are plan views showing a process of coupling the stopper ring of the embodiment of FIG. 4,
FIGS. 13 and 14 are plan views showing a process in which the stopper ring of the embodiment of FIG. 4 is released.

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

The belt tensioner according to the present invention provides tension to the timing belt or the driving belt in the belt driving system of the engine. The belt tensioner includes an eccentric regulating portion 100, a bush 200, a pivot arm And a torsion spring 600. The eccentric adjustment portion 100 includes a sleeve 110, a pivot shaft 120, and a shaft fixing ring 130. The sleeve 110, the pivot shaft 120, . The pivot arm 300 includes a stopper rib 310. The base plate 500 includes a locking fixation rib 510 and an eccentric locking rib 520. The belt tensioner according to the present invention includes a stopper A pin 700, a thrust washer 800, and a spring support 900.

1 to 3, the belt tensioner according to the present invention is mounted on an engine mount surface ES provided with a belt drive system by a fixing bolt 114, and is provided with tension to the drive or timing belt B Lt; / RTI > This belt tensioner includes an eccentric regulating portion 100 which is used to move the pivot arm 300 toward or away from the belt B.

1 to 14, the eccentricity adjusting unit 100 is mounted on the engine mounting surface ES to adjust the belt B in a belt tightening direction S1 and a belt tightening direction S1 from the belt tightening direction S1 The pivot shaft 120 and the shaft retaining ring 130 as shown in FIGS. 3, 5 to 10, in a configuration in which the releasing belt can be adjusted in the relaxation direction S2.

The pivot arm 300 is installed to be able to eccentrically pivot through a cylindrical bush 200 in the outer circumferential direction of the eccentric adjustment portion 100. The pivot arm 300 is cylindrical and has a cylindrical outer surface around which the pulley 400 is fitted. The pivot arm 300 is inserted in the outer circumferential direction of the eccentric adjustment portion 100 via the bush 200 and rotates, The arm 300 is pivoted eccentrically with respect to the eccentric regulating portion 100. The pulley 400 is fitted around the pivot arm 300 and rotates around the pivot arm 300 through a bearing 410 so as to rotate freely. That is, the eccentric pivotal movement of the pivot arm 300 is the same as eccentrically pivoting the pulley 400 that is in contact with the belt B as a result.

3 and 6, the base plate 500 is formed with an engagement fixing rib 510 on its outer circumference so as to be engaged with the engine mounting surface ES in a ring shape. The base plate 500 is positioned to contact the engine mounting surface ES and has an annular ring shape for receiving the eccentric regulating portion 100. The base plate 500 is formed with an eccentric relief rib 520 to serve as a stopper pin 700 for inserting and fixing the stopper pin 700 together with the stopper rib 320 of the pivot arm 300 as will be described later.

The torsion spring 600 is installed between the base plate 500 and the pivot arm 300 as shown in FIGS. 3 and 5, and the spring force is applied to the pivot arm 300 so as to face the belt tightening direction to provide. The pivot arm 300, which is eccentrically pivotally moved by the spring force of the torsion spring 600, acts on the belt B in a tensioning direction. At this time, a spring support 900 is provided so that the torsion spring 600 can be stably supported between the base plate 500 and the pivot arm 300. That is, the spring support 900 is interposed between the base plate 500 and the torsion spring 600 to support the torsion spring 600, as shown in FIGS.

As a first feature of the belt tensioner according to the present invention, the eccentric regulating portion 100 includes the sleeve 110, the pivot shaft 120, and the shaft retaining ring 130 as shown in Figs. 3, 5 to 10, . The flange 111 is formed at one end of the sleeve 110 and the ring insertion groove 112 is formed in the outer peripheral surface of the other end by a C cut ring. And a fixing bolt 114 is inserted into the bolt hole 113 to be mounted on the engine mounting surface ES. One end of the pivot shaft 120 is inserted into the lower portion of the flange 111 of the sleeve 110 through the other end of the sleeve 110 so that the outer circumferential surface thereof pierces the inner circumferential surface of the bush 200, The stepping stopper 121 is enlarged and formed. At this time, the shaft fixing ring 130 is inserted into the ring insertion groove 112 formed at the other end of the sleeve 110 in the form of a C-cut ring, and is engaged with the locking protrusion 121 of the pivot shaft 120 The sleeve 110 and the pivot shaft 120 are fixed so as not to be separated in the longitudinal direction.

At this time, the pivot arm 300 is inserted in the outer diameter direction of the eccentricity adjusting unit 100, and the bush 200 and the pivot shaft 120 are interposed between the sleeve 110 and the pivot arm 300, A configuration for reducing contact friction between the flange 111 of the pivot arm 110 and the pivot arm 300 is needed. 3 and 5, the thrust washer 800 is interposed between the flange 111 of the sleeve 110 and the pivot arm 300 to reduce the vertical contact friction during rotation.

The characteristic configuration of the eccentric regulator 100 is achieved through the coupling between the sleeve 110 and the pivot shaft 120 during the final assembling of the belt tensioner according to the present invention and the normal construction described above , And the shaft fixing ring (130) can be easily assembled and disassembled through a simple structure.

More specifically, the process of assembling the belt tensioner according to the present invention will be described. The bearing 410 constitutes a pulley assembly with the inner diameter of the pulley 400 being press-fitted, and the bush 200 is press- Thereby constituting the arm assembly. At this time, the arm assembly is press-fitted into the inner diameter of the bearing 410 of the pulley assembly to form the pulley arm assembly in advance. The outer peripheral surface of the other end of the pivot shaft 120 of the eccentric regulating portion 100 is press-fitted into the base plate 500 and the spring support 900 and the torsion spring 600 are assembled to the upper side of the base plate 500. After assembling the pulley arm assembly, the thrust washer 800 is assembled on the pivot arm 300. The other end of the sleeve 110 is inserted into the pivot shaft 120 and then protrudes beyond the engagement protrusion 121 of the pivot shaft 120. [ The shaft fixing ring 130 is inserted into the ring insertion groove 112 formed at the other end of the sleeve 110 as shown in Figure 10 so that the shaft fixing ring 130 is engaged with the pivot shaft 120 And is engaged with the jaw 121 to complete the assembly.

When the assembled belt tensioner is mounted on the engine mounting surface ES, the spring force of the torsion spring 600 causes the pivot arm 300 to rotate in the belt tightening direction S1, So that it is difficult to attach the belt B to the pulley 400. [0054] Therefore, before the belt tensioner is mounted on the engine mounting surface ES, that is, as shown in FIG. 13, the pivot arm 300 is fixed in advance in the belt slackening direction S2 in the assembled state, Assembly is completed. Thus, after the final assembled belt tensioner is mounted on the engine mounting surface ES and the belt B is easily mounted on the pulley 400, the pivot arm 300 is maintained in the belt slackening direction S2 To switch to the belt tightening direction S1 as shown in Fig.

1 to 14, the pivot arm 300 includes an indicator 310 formed to protrude in an outer circumferential direction so as not to interfere with the pulley 500, and an indicator 310 protruding adjacent to the indicator 310, And an eccentric loosening rib 520 protruding from the base plate 500. The eccentric loosening rib 520 is formed on the outer circumference of the base plate 500. The eccentric loosening rib 520 is formed on the outer circumference of the base plate 500, An elongated pin insertion slit 521 corresponding to the pin insertion hole 321 of the stopper rib 320 is opened. The stopper pin 700 is attached to the base plate 500 fixed on the engine mounting surface ES as shown in FIGS. 4, 11 and 12, The pivot arm 300 is inserted into the pin insertion hole 321 of the stopper rib 320 and the pin insertion slit 521 of the base plate 500 so that the pivot arm 300 is inserted in the belt relaxation direction S2. Thereby maintaining the eccentric pivot state.

The pivot arm 300 is detached from the pin insertion hole 321 of the stopper rib 320 and the pin insertion slit 521 of the base plate 500 as shown in FIGS. 13 and 14, Is pivotally moved in the belt tightening direction (S1) to provide tension to the belt (B).

As described above, the belt tensioner according to the present invention is configured such that the coupling between the sleeve 110 and the pivot shaft 120 of the eccentric adjustment unit 100, which is the final assembling step, is simplified through the shaft fixing ring 130 having the C cut ring shape The stopper rib 320 protruding in the outer circumferential direction of the pulley 400 when the final assembly is completed is maintained in the belt slackening direction S2 of the pivot arm 300 with respect to the spring force of the torsion spring 600, The eccentric relaxation rib 520 and the stopper pin 700, thereby facilitating fabrication, assembly, and disassembly.

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.

B: Belt
S1: Belt tightening direction
S2: Belt Relaxation Direction
ES: engine mounting surface
100: eccentric adjustment portion 110: sleeve
111: flange 112: ring insertion groove
113: bolt hole 114: fixing bolt
120: Pivot shaft 121:
130: Shaft retaining ring
200: Bush
300: pivot arm 310: indicator
320: Stopper rib 321: Pin insertion hole
400: pulley 410: bearing
500: base plate 510: retaining ribs
520: eccentric relaxation rib 521: pin insertion slit
600: Torsion spring
700: Stopper pin
800: Thrust washer
900: Spring support

Claims (4)

A belt tensioner for providing tension to a timing belt or a drive belt in a belt drive system of an engine,
An eccentric adjustment portion mounted on the engine mounting surface and adjustable in a belt tightening direction in which the belt is tightened and in a belt relaxing direction in a direction away from the belt tightening direction;
A pivot arm provided to be able to eccentrically pivot through a cylindrical bush in an outer circumferential direction of the eccentric adjustment portion,
A pulley for rotating the outer periphery of the pivot arm via a bearing,
A base plate having a ring-shaped engaging and fixing rib formed on an outer periphery thereof so as to be engaged with the engine mounting surface,
And a torsion spring installed between the base plate and the pivot arm and providing a spring force such that the pivot arm faces the belt tightening direction,
The eccentric-
A bolt hole is formed in the flange from one end to the other end so as to be eccentric from the rotation center shaft, and a bolt hole is formed in the bolt hole A sleeve having a fixing bolt inserted therein and mounted on the engine mounting surface,
A pivot shaft having one end inserted into a lower portion of the flange of the sleeve through the other end of the sleeve so as to pierce the inner circumferential surface of the bush with a cylindrical shape and a stepped engagement protrusion formed on the inner circumferential surface of the other end,
And a shaft fixing ring inserted into a ring insertion groove formed at the other end of the sleeve in the shape of a C cut ring and fixed to the engagement protrusion of the pivot shaft to fix the sleeve and the pivot shaft so as not to be separated in the longitudinal direction Features a belt tensioner.
The method according to claim 1,
The pivot arm
An indicator formed to protrude in an outer circumferential direction so as not to interfere with the pulley, and a stopper rib protruding adjacent to the indicator and having a pin insertion hole formed therethrough,
Wherein the base plate comprises:
And an elongated pin insertion slit corresponding to the pin insertion hole of the stopper rib is opened in the eccentric relaxation rib,
When the pivot arm is eccentrically pivoted in the belt retracting direction with respect to the base plate fixed to the engine mounting surface, the pin insertion hole is inserted into the pin insertion hole of the stopper rib and the pin insertion slit of the base plate, Further comprising a stopper pin for maintaining the arm in an eccentrically pivotal state.
3. The method of claim 2,
Wherein the stopper pin
The pin insertion slot of the base plate and the pin insertion hole of the stopper rib release the pivot arm to pivot in the belt tightening direction to provide tension to the belt.
The method according to claim 1,
A thrust washer interposed between the flange of the sleeve and the pivot arm,
And a spring support interposed between the base plate and the torsion spring to support the torsion spring.

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