CN101263320B

CN101263320B - Shoe tensioner for a synchronous belt drive for use with oil

Info

Publication number: CN101263320B
Application number: CN2005800514288A
Authority: CN
Inventors: M·坎塔托雷; F·奇波洛内
Original assignee: Dayco Europe SRL
Current assignee: Dayco Europe SRL
Priority date: 2005-07-29
Filing date: 2005-07-29
Publication date: 2010-06-02
Anticipated expiration: 2025-07-29
Also published as: CN101263320A

Abstract

A shoe tensioner for a synchronous belt drive, having a guide member (3) adapted to cooperate with a drive belt (4) and hinged at one end about a first axis (A); elastic means (5) cooperating with the guide member (3) to tension the belt (4); aid connecting means (11, 12, 2) for connecting the tensioner (1) to a supporting wall. More specifically, the elastic means (5) include a coil spring.

Description

The shoe tensioner that is used for the synchronous band transmission used with oil

Technical field

The present invention relates to be used for the shoe tensioner of the synchronous band transmission used with oil.

Background technique

Application for (in-oil) in the oil, known synchronous chain-driven shoe tensioner (synchronous chain drive shoe tensioner) comprises a flat spring that rotates around stationary axle (leaf spring) and a guiding shoe (guide shoe), and this guiding shoe contacts cooperation by the flat spring support and with chain.More specifically, flat spring comprises the first end section and second end section, wherein the first end section is hinged to stationary axle, and the second end section is opposite with the first end section and cooperates with the whole braking member of adjustable positions, and this braking member promotes the elastic element that the guiding shoe comes the tensioning protrusion to chain.

Because the friction of shoe causes the serious wearing and tearing and the damage of band, so shoe tensioner is not used in the dry state transmission, for example Chang Gui band transmission usually.

Designed the Synchronous Transmission that comprises band (in-oil belt) in the oil recently, wherein known shoe tensioner has been proved the distortion of band very responsive, and the distortion of band is more remarkable than the distortion of chain usually.Distortion may be to be caused by the variation as operating temperature, and found to be difficult to compensate by known shoe tensioner, therefore cause the large-scope change of belt tension, this has weakened the meshing condition of drive wheel (drive pulley) and has caused the undesired of transmission work.

Summary of the invention

An object of the present invention is to provide a kind of synchronous band driven pedrail sheet tension device that can avoid above-mentioned defective.

According to the present invention, a kind of shoe tensioner is provided, it comprises a director element (3), this director element (3) is fit to cooperate with line belt (4) and an end is articulated in first (A); Cooperate to come the spiral of the described line belt of tensioning (4) or the elastic device that spirals (5) with described director element (3); And be used to connect the connection set (11,12,2) of described tension device (1) to supporting walls; A locking member (12), it is used for locking described fastener (20) pre-determining the position angledly, described elastic device (5) comprises a first end section (28), and it is connected on the fastener (20) that is supported by described connection set (12); And a second end section (31), it is relative with described first end section (28) and cooperate with described director element (3), and described fastener (20) comprises a lever arm (23); And coupling arrangement (25), it is supported by described lever arm (23) and is suitable for cooperating so that rotate described fastener (20) to described the pre-determine position relative with described elastic device (5) with an instrument.

Description of drawings

Preferred a, non-limiting example of the present invention will be illustrated by example with reference to the accompanying drawings, in the accompanying drawings:

Fig. 1 has showed the perspective exploded view according to shoe tensioner of the present invention;

Fig. 2 has showed the side view of Fig. 1;

Fig. 3 has showed the longitudinal sectional view of tension device along the III-III line incision of Fig. 2.

Embodiment

Fig. 1 has showed shoe tensioner 1, and it comprises the elongated supporting element 2 that is suitable for being rigidly connected to the internal combustion engine wall (not shown); Director element 3, it is suitable for cooperating with the saw tooth belt 4 that is used for as application in the oil of timing transmission; And, cooperate to come the plane scroll spring (spiral spring) 5 of tension toothed belt 4 with director element 3.

More specifically, elongated supporting element 2 comprises a plate 6 that limits two holes 7,8 integratedly; And the support 9 of a bending, it is positioned at director element 3 about the opposite side of saw tooth belt 4 and formed the fixing braking device (stop) of director element 3.At relative two ends, plate 6 comprises the first end section 10a of limiting hole 7; And be connected to the second end section 10b of support 9 and limiting hole 8.

Elongated supporting element 2 is connected to internal combustion engine wall by two

screws

11,12 being encased in the hole 7,8 separately, and

screw

11,12 comprises

helical thread portion

13,14 and the centering of cylinder separately

part

15,16 separately.

The centering part 15 of screw 11 defines the axis A by hole 7, and is assembled on the director element 3 to form articulated joint.More specifically, director element 3 comprises the axle collar 17, and the mode of axial restraint is mounted on the centering part 15 this axle collar 17 to rotate freely also; And crooked, substantially rigid shoe 18, it has end portion, and this end portion is connected on the axle collar 17 removedly by lock pin 19.

At relative two ends, axle A with respect to elongated supporting element 2, centering part 16 defines the axle B by hole 8, and the mode supporting plane spiral spring 5 by fastener 20, wherein this fastener 20 is installed into the part 16 of feeling relieved on the centering part 16 and when screw 12 is tightened with rotation mode and is locked by rigidity.

More specifically, fastener 20 comprises that radially being loaded on bourrelet divides 16 lining 22; And be rigidly connected to the arm 23 of lining 22 longitudinal ends.

Lining 22 has the otch 24 that rotation is installed to spring 5, arm 23 has the hexagon ring seat 25 that certain distance is arranged with axle B, and the pointer that forms by projection 26 radially, pointer is used for reference mark 27 on the alignment sheets 6 so that the predetermined best preload position of qualification plane scroll spring 5.

Plane scroll spring 5 comprises towards axle B integratedly and is connected to the terminal attachment portion 28 of longitudinal cut 24; The annular disk of the hole seat 30 of formation lining 22 is around part 29; Stretch out and place end portion 31 between support 9 and the crooked shoe 18 with respect to coiling part 29.In more detail, each circle of coiling part 29 contacts with each other at least in part and produces the damping force that helps to hinder director element 3 motions.

For assembling tension device 1, at first elongated supporting element 2 is placed on the engine wall, then screw 11 is tightened in the tapped hole on the wall so that director element 3 is hinged in the axial restraint position of relative axle A.

By screw 12 is screwed in the hole 8, fastener 20 and plane scroll spring 5 align with axle B and are connected on the elongated supporting element 2 subsequently, and wherein end portion 31 places between the shoe 18 of support 9 and bending.

Instrument is inserted in the hexagon ring seat 25, rotate fastener 20 by arm 23 then and make radially projection 26 aligning reference marks 27, and screw 12 is tightened rigidity locking fastener 20.When arm 23 rotations, plane scroll spring 5 is tightened and is promoted crooked shoe 18 and comes tension toothed belt 4.

In actual use, for tension band 4, end portion 31 acts on director element 3, and puts on the total length distribution of the operation traverse (in-service movement) of end portion 31 along end portion 31 and coiling part 29.Therefore plane scroll spring 5 has the tension variation of limited rigidity and check strap 4.

Advantage according to tension device of the present invention is as described below.

Use comprises that the spring of the appropriate size number of turn makes with 4 and produces enough big mean tension, and the tension variation of check strap 4 when having low rigidity simultaneously and can guarantee that saw tooth belt 4 is in the scope of normal engaged.Disc spring (coil spring) also provides a kind of easy means that hinders director element 3 motions.

The fastener 20 of rotation allows the preload of spring 5 to be adjusted to predetermined value at assembling stage, and radially projection 26 has provided the direct demonstration that expectation is set, and has therefore improved assembling speed.

Use

screw

11,12 to determine the running shaft of director element 3 and fastener 20, can reduce needed component number, and the shoe 18 of removable bending can be replaced, and for example, does not need to replace whole tension device 1 when the friction owing to saw tooth belt 4 causes wearing and tearing.

In addition, support 9 is supported the end portion 31 and the crooked shoe 18 of plane scroll spring 5, and has formed a securing supports to support any overload of saw tooth belt 4, has therefore prevented the damage to spring 5.

Significantly, under the scope of the present invention that does not exceed the claims qualification, can be to changing in this description and illustrated tension device 1.

Especially, helical spring can be used to replace plane scroll spring; In this case, the stroke of crooked shoe 18 distributes along the total length of spring circle once more, has therefore limited the tension variation of spring, and and then has limited the tension variation of saw tooth belt 4.

Claims

1. one kind is used for synchronously with the shoe tensioner of transmission, and it comprises a director element (3), and this director element (3) is fit to cooperate with line belt (4) and an end is articulated in first (A); Cooperate to come the spiral of the described line belt of tensioning (4) or the elastic device that spirals (5) with described director element (3); And be used to connect the connection set (11,12,2) of described tension device (1) to supporting walls; A locking member (12), it is used for locking fastener (20) pre-determining the position angledly, and described elastic device (5) comprises a first end section (28), and it is connected on the described fastener (20) that is supported by described connection set (12); And a second end section (31), it is relative with described first end section (28) and cooperate with described director element (3), and described fastener (20) comprises a lever arm (23); And coupling arrangement (25), it is supported by described lever arm (23) and is suitable for cooperating so that rotate described fastener (20) to described the pre-determine position relative with described elastic device (5) with an instrument.

2. tension device as claimed in claim 1 is characterized in that described fastener (20) is rotatable so that set the load of described elastic device (5).

3. tension device as claimed in claim 2 is characterized in that comprising being used to indicate the described indicating device (26,27) that pre-determines the position.

4. tension device as claimed in claim 3 is characterized in that described fastener (20) partly is contained in described elastic device (5) the formed hole seat (30).

5. the described tension device of any one claim in the claim as described above, it is characterized in that described connection set (11,12,2) comprises a supporting element (2), it supports described director element (3) and described elastic device (5), and has the angular motion that a braking member (9) is used to limit described director element (3) described relatively first (A).

6. tension device as claimed in claim 5 is characterized in that described supporting element (2) is a plate, and this plate comprises a bender element (9) that limits described braking member integratedly.

7. tension device as claimed in claim 1 is characterized in that described connection set comprises a connecting element (11), and it forms described axle (A) and described director element (3) is connected on the described supporting walls.

8. the tension device described in claim 7 is characterized in that described director element (3) comprises an axle collar (17) that is connected with around described connecting element (11) rotation; And a substantially rigid shoe (18), it is suitable for directly cooperating with described line belt (4) and being connected to removedly on the described axle collar (17).

9. tension device as claimed in claim 1 is characterized in that described connection set comprises one second connecting element (12) that described tension device (1) is connected to described supporting walls; Described second connecting element (12) and separated the opening of described first connecting element (11), and described second connecting element (12) is limited by described locking member.