CN112112941A - Annular double-arm tensioner - Google Patents

Annular double-arm tensioner Download PDF

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Publication number
CN112112941A
CN112112941A CN202011037128.7A CN202011037128A CN112112941A CN 112112941 A CN112112941 A CN 112112941A CN 202011037128 A CN202011037128 A CN 202011037128A CN 112112941 A CN112112941 A CN 112112941A
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CN
China
Prior art keywords
tensioning arm
arm
annular
tensioning
tensioner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011037128.7A
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Chinese (zh)
Inventor
曹阳
宋慧
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gates Younita Transmission System Shanghai Co ltd
Original Assignee
Gates Younita Transmission System Shanghai Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Gates Younita Transmission System Shanghai Co ltd filed Critical Gates Younita Transmission System Shanghai Co ltd
Priority to CN202011037128.7A priority Critical patent/CN112112941A/en
Publication of CN112112941A publication Critical patent/CN112112941A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/14—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of a driving or driven pulley
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0802—Actuators for final output members
    • F16H2007/0808—Extension coil springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0842—Mounting or support of tensioner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0863—Finally actuated members, e.g. constructional details thereof
    • F16H2007/0865—Pulleys

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

The invention discloses an annular double-arm tensioner for an internal combustion engine with a starter-generator, which comprises a base, a first tensioning arm and a second tensioning arm, wherein the first tensioning arm and the second tensioning arm are provided with a connecting part and a pulley shaft, an extension spring is arranged between a first pulley and a second pulley of the first tensioning arm and the extension spring, the pulley and the connecting part of any one of the first tensioning arm and the second tensioning arm are separated by the pulley and the connecting part of the other tensioning arm in the circumferential direction, the connecting parts of the first tensioning arm and the second tensioning arm are respectively connected with two ends of the extension spring, and the extension spring acts on the first tensioning arm and the second tensioning arm to enable the first pulley and the second pulley to have the tendency of moving towards each other. The tensioner is simple in structure, convenient to design and manufacture and convenient to install.

Description

Annular double-arm tensioner
Technical Field
The present invention relates to an annular two-arm tensioner, particularly suitable for use in an internal combustion engine drive system having a starter-generator.
Background
In order to improve the fuel consumption and emissions of engines, engines with starter-generator units have been developed. In such engines, the starter-generator unit, when started, acts as a starter motor to restart the engine; once the engine is started, the starter-generator unit may act as a generator to recharge the battery.
The starter-generator unit is mechanically coupled to the crankshaft of the engine through an endless drive, such as a belt or chain. The endless drive is vibrated by the influence of the system, particularly when the starter-generator unit is switched in function between the starter and the generator, in which case the tight side and the slack side of the endless drive are angularly interchanged, and therefore tensioners have been developed to deal with the vibration of the endless drive with the starter-generator unit.
Specific tensioners can be referred to in US9551402B2, CN106168275A, CN107208755B, all of which use compression springs abutting the tensioning arm, under pressure, may cause the compression springs to bend and deform off axis, making it difficult to control the stability of the springs. Reference is also made to the tensioner construction disclosed in WO2019090423(a1) which adds an extension spring inside the pulley, but the space on the engine end face is extremely limited, and such a design may make the tensioner difficult to adapt to different engines.
Disclosure of Invention
The technical problem that this creation will solve is to provide an annular two-arm tensioner.
In order to solve the above technical problem, the present invention provides an annular two-arm tensioner for an internal combustion engine having a starter-generator, the internal combustion engine including a crankshaft pulley, an accessory pulley, and a starter-generator pulley, an annular transmission member being wound around the crankshaft pulley, the accessory pulley, and the starter-generator pulley,
the annular double-arm tensioner comprises a base, a first tensioning arm and a second tensioning arm, wherein the first tensioning arm and the second tensioning arm are provided with a connecting part and a belt wheel shaft, the base is provided with a fixing part for fixing the annular double-arm tensioner on an internal combustion engine, the base, the first tensioning arm and the second tensioning arm are respectively provided with an annular part, the three annular parts are mutually sleeved around the same axis, the annular double-arm tensioner is sleeved on a belt wheel of a starter-generator through the annular parts, the first tensioning arm and the second tensioning arm can rotate around a rotation axis relative to the base, the belt wheel shafts of the first tensioning arm and the second tensioning arm are respectively provided with a first belt wheel and a second belt wheel which are abutted against,
the annular double-arm tensioner is characterized by further comprising an extension spring, wherein the first belt wheel and the second belt wheel of the first tensioning arm and the second tensioning arm and the extension spring are separated from each other in the circumferential direction by the belt wheel and the connecting part of the other tensioning arm, the connecting parts of the first tensioning arm and the second tensioning arm are respectively connected with two ends of the extension spring, and the extension spring acts on the first tensioning arm and the second tensioning arm to enable the first belt wheel and the second belt wheel to have the tendency of moving towards each other.
Preferably, bushings which can generate damping when the first tensioning arm, the second tensioning arm and the annular part of the base rotate relatively are respectively arranged between the first tensioning arm, the second tensioning arm and the annular part of the base.
Preferably, an elastic support is arranged between the first tensioning arm and the annular part of the base, and the elastic support provides an axial acting force between the first tensioning arm and the annular part of the base and the second tensioning arm and the annular part of the base.
Preferably, the connecting portion of the first tensioning arm and the second tensioning arm is a cylindrical portion extending in the axial direction, and arc-shaped buckling portions sleeved on the cylindrical portion are arranged at two ends of the extension spring.
Preferably, the cylindrical portion is further provided with a cylindrical bushing, the bushing is provided with a groove extending along the circumferential direction on a radial surface perpendicular to the axis, and the arc-shaped buckling portions at the two ends of the extension spring are sleeved on the groove.
Preferably, the first tensioning arm and the second tensioning arm have the same shape and structure.
Preferably, a line connecting the connecting portion of the first tensioning arm and the pulley shaft intersects a line connecting the connecting portion of the second tensioning arm and the pulley shaft.
Preferably, the connecting portions of the first and second tensioning arms and the pulley shaft are respectively disposed on both sides of the rotation axis of the tensioning arm.
The beneficial effect of this creation lies in: the extension spring and the belt wheel are respectively arranged on the upper side and the lower side of the axis, so that the space near the belt wheel of the starter-generator is effectively utilized, and the first tensioning arm and the second tensioning arm adopt the same structure, so that the design, the manufacture and the assembly are convenient.
Drawings
FIG. 1 is a schematic diagram of a ring dual arm tensioner.
FIG. 2 is an exploded schematic view of a ring dual arm tensioner.
Detailed Description
The present invention will be described more fully with reference to fig. 1-2 of the drawings.
An endless two-arm tensioner for an internal combustion engine having a starter-generator includes a crankshaft pulley, an accessory pulley, and a starter-generator pulley, with an endless drive member wrapped around the crankshaft pulley, the accessory pulley, and the starter-generator pulley.
The annular dual-arm tensioner comprises a first tensioning arm 1, a second tensioning arm 2, a base 3, and an extension spring 4.
The base 3 is provided with a fixing portion 31 that fixes the annular double-arm tensioner to the internal combustion engine.
The base 3, the first tensioning arm 1 and the second tensioning arm 2 are respectively provided with annular parts 10, 20 and 30, the three annular parts are mutually sleeved around the same rotation axis, so that the annular double-arm tensioner is sleeved on a belt wheel of a starter-generator through the annular parts, and the first tensioning arm 1 and the second tensioning arm 2 can rotate around the rotation axis relative to the base 3. The axis of rotation is typically coincident with the axis of the starter-generator pulley, and in some designs, is also allowed to be offset from the axis of the starter-generator pulley. In this creation, the annular portion 30 of the base 3 is on one side in the axial direction, and the annular portions 10 and 20 of the first and second tensioning arms are respectively sleeved on the annular portion 30 of the base. In other embodiments, the annular portions 10, 20 of the first and second tensioning arms may be clamped on both axial sides of the base annular portion 30. The clamping can be carried out through the matching of the concave-convex structures of the three annular parts, or components such as bolts or annular clamping pieces can be additionally arranged to be matched with the first tensioning arm, the second tensioning arm and the base so as to realize the stable combination between the first tensioning arm and the base.
Bushings (not shown) for damping the relative rotation of the first and second tensioning arms 1, 2 and the base 3 are provided between the annular portions thereof. An elastic support is also provided, which provides an axial force between the first and second tensioning arms and the annular portion of the base.
The first tensioning arm 1 and the second tensioning arm 2 are provided with a connection 11, 21 and a pulley shaft 12, 22, respectively. The connecting parts 11 and 21 are respectively connected with two ends of the extension spring 4, and the pulley shafts 12 and 22 are used for installing pulleys 13 and 23 which are abutted with the annular transmission parts. The tension spring 4 acts on the first and second tensioning arms 1, 2 and tends to move the first and second pulleys 13, 23 towards each other. Referring to fig. 1, the pulley and connecting portion of either of the first and second tensioning arms 1, 2 are circumferentially spaced apart by the pulley and connecting portion of the other tensioning arm. The connecting part 11 of the first tensioning arm 1 intersects with the connecting line of the pulley shaft 12 and the connecting part 12 of the second tensioning arm 2 intersects with the connecting line of the pulley shaft 22. Taking the angle shown in fig. 1 as an example, a horizontal straight line is drawn through the axis of the tensioner, the first belt pulley, the second belt pulley and the extension spring of the first tensioning arm and the second tensioning arm are respectively arranged at the upper side and the lower side of the straight line, so that the space near the belt pulley of the starter-generator is effectively utilized, the space is particularly important on the end surface with limited engine space, the belt pulley of the starter-generator is basically not shielded, and the sight of an operator is convenient to observe.
The extension spring is always in a straight line under the extension action, the axis of the extension spring cannot deviate from the axis of the extension spring, and compared with the bending or torsional deformation possibly generated by the compression spring, the system stability of the tensioner adopting the extension spring is better. Compared with a hydraulic rod or an air supporting rod, the tensioner adopting the extension spring is simpler in structure and lower in cost.
In a preferred embodiment, the connecting portions 11, 21 of the first and second tensioning arms 1, 2 are cylindrical members extending in the axial direction, and arc-shaped engaging portions 41 are provided at both ends of the extension spring 4 to be fitted over the cylindrical connecting portions 11, 21. Preferably, the cylindrical connecting portions 11 and 21 are further provided with cylindrical bushes 27, the bushes 27 are provided with grooves 28 extending in the circumferential direction on radial surfaces perpendicular to the axis, and the arc-shaped engaging portions 41 at both ends of the tension spring 4 are fitted over the grooves 28 so as to prevent the engaging portions 41 of the tension spring 4 from moving in the axial direction. The bush 27 is preferably made of plastic, and can provide a certain damping, and the bush 27 made of plastic can reduce the friction between the arc-shaped engaging portion 41 of the tension spring and the connecting portions 11 and 21, and reduce noise, compared with the metal material of the tension spring 4 and the connecting portions 11 and 21.
The first tensioning arm and the second tensioning arm have the same shape and structure. In this creation, the structure is the same indicates that first, second tensioning arm is through punching press or casting manufacturing process, and during preliminary shaping, adopt same mould to make, the appearance is the same. After the preliminary forming, corresponding structures such as holes, recesses, protrusions and the like are formed through secondary stamping or other common processing technologies in the technical field, so that the first tensioning arm and the second tensioning arm can be matched with each other or the tensioning arms can be matched with other parts such as a base, a bushing and the like. By adopting the components with the same structure, the manufacturing cost can be reduced, and the assembly error can be reduced. Meanwhile, the distance between the two belt wheels and the axis is the same due to the parts with the same structure, and when the load of the belt wheels is calculated, the structure is simpler, and engineering calculation is facilitated.
The technical solutions described above are only for illustrating the embodiments of the present invention, and are not limiting to the present invention, and equivalent changes made by those skilled in the art according to the creation of the present invention belong to the protection scope of the present invention.

Claims (8)

1. An annular two-arm tensioner for an internal combustion engine having a starter-generator, the internal combustion engine including a crankshaft pulley, an accessory pulley, a starter-generator pulley, an annular drive member wrapped around the crankshaft pulley, the accessory pulley, the starter-generator pulley,
the annular double-arm tensioner comprises a base, a first tensioning arm and a second tensioning arm, wherein the first tensioning arm and the second tensioning arm are provided with a connecting part and a belt wheel shaft, the base is provided with a fixing part for fixing the annular double-arm tensioner on an internal combustion engine, the base, the first tensioning arm and the second tensioning arm are respectively provided with an annular part, the three annular parts are mutually sleeved around the same axis, the annular double-arm tensioner is sleeved on a belt wheel of a starter-generator through the annular parts, the first tensioning arm and the second tensioning arm can rotate around a rotation axis relative to the base, the belt wheel shafts of the first tensioning arm and the second tensioning arm are respectively provided with a first belt wheel and a second belt wheel which are abutted against,
the annular double-arm tensioner is characterized by further comprising an extension spring, wherein the first belt wheel and the second belt wheel of the first tensioning arm and the second tensioning arm and the extension spring are separated from each other in the circumferential direction by the belt wheel and the connecting part of the other tensioning arm, the connecting parts of the first tensioning arm and the second tensioning arm are respectively connected with two ends of the extension spring, and the extension spring acts on the first tensioning arm and the second tensioning arm to enable the first belt wheel and the second belt wheel to have the tendency of moving towards each other.
2. The annular dual arm tensioner as claimed in claim 1, wherein: and bushings which can generate damping when the first tensioning arm, the second tensioning arm and the annular part of the base rotate relatively are respectively arranged between the first tensioning arm, the second tensioning arm and the annular part of the base.
3. The annular dual arm tensioner as claimed in claim 1, wherein: and elastic supporting parts are arranged between the first tensioning arm, the second tensioning arm and the annular part of the base, and the elastic supporting parts provide axial acting force between the first tensioning arm, the second tensioning arm and the annular part of the base.
4. The annular dual arm tensioner as claimed in claim 1, wherein: the connecting portion of the first tensioning arm and the second tensioning arm is a cylindrical portion extending in the axial direction, and arc-shaped buckling portions sleeved on the cylindrical portion are arranged at two ends of the extension spring.
5. The annular dual-arm tensioner as claimed in claim 4, wherein: the cylindrical part is also provided with a cylindrical bush, the bush is provided with a groove extending along the circumferential direction on the radial surface vertical to the axis, and the arc-shaped buckling parts at the two ends of the extension spring are sleeved on the groove.
6. The dual arm tensioner as in claim 1, wherein: the first tensioning arm and the second tensioning arm have the same shape and structure.
7. The dual arm tensioner as in claim 1, wherein: and the connecting part of the first tensioning arm intersects with the connecting line of the pulley shaft and the connecting part of the second tensioning arm intersects with the connecting line of the pulley shaft.
8. The dual arm tensioner as in claim 1, wherein: the connecting parts of the first tensioning arm and the second tensioning arm and the pulley shaft are respectively arranged on two sides of the rotation axis of the tensioning arm.
CN202011037128.7A 2020-09-24 2020-09-24 Annular double-arm tensioner Pending CN112112941A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011037128.7A CN112112941A (en) 2020-09-24 2020-09-24 Annular double-arm tensioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011037128.7A CN112112941A (en) 2020-09-24 2020-09-24 Annular double-arm tensioner

Publications (1)

Publication Number Publication Date
CN112112941A true CN112112941A (en) 2020-12-22

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CN202011037128.7A Pending CN112112941A (en) 2020-09-24 2020-09-24 Annular double-arm tensioner

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220018421A1 (en) * 2020-07-20 2022-01-20 Muhr Und Bender Kg Belt tensioning device with a belt drive
WO2024134482A1 (en) * 2022-12-21 2024-06-27 Propulsion Solutions S.R.L. Tensioner for an accessory drive of a motor vehicle and accessory drive including such a tensioner

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220018421A1 (en) * 2020-07-20 2022-01-20 Muhr Und Bender Kg Belt tensioning device with a belt drive
US11629778B2 (en) * 2020-07-20 2023-04-18 Muhr Und Bender Kg Belt tensioning device with a belt drive
WO2024134482A1 (en) * 2022-12-21 2024-06-27 Propulsion Solutions S.R.L. Tensioner for an accessory drive of a motor vehicle and accessory drive including such a tensioner

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