CN216555185U

CN216555185U - Double arm tensioner

Info

Publication number: CN216555185U
Application number: CN202123023539.3U
Authority: CN
Inventors: 臧涛; 傅红良
Original assignee: Gates Unitta Power Transmission Shanghai Ltd
Current assignee: Gates Unitta Power Transmission Shanghai Ltd
Priority date: 2021-12-06
Filing date: 2021-12-06
Publication date: 2022-05-17
Anticipated expiration: 2031-12-06

Abstract

The utility model discloses a double-arm tensioner, which is used on an internal combustion engine provided with a power generation-electric motor unit, wherein the internal combustion engine is provided with a boss for mounting the double-arm tensioner, the double-arm tensioner comprises a first tensioning arm and a second tensioning arm, a torsion spring is arranged between the first tensioning arm and the second tensioning arm to deflect the first tensioning arm and the second tensioning arm in a direction close to each other around a pivot axis of the second tensioning arm, the double-arm tensioner further comprises a base part, the first tensioning arm is sleeved on the base part in a swinging mode, the base part is provided with a through hole for an assembling bolt to pass through, one axial end of the base part is a mounting surface for mounting the double-arm tensioner to an engine, a concave part for accommodating the boss of the internal combustion engine is arranged at the end part close to the mounting surface of the double-arm tensioner, the bolt passes through the through hole to fix the double-arm tensioner on the boss, and the height of the concave part accounts for 20% -45% of the height of the base part.

Description

Double arm tensioner

Technical Field

The utility model relates to a double-arm tensioner, in particular to a double-arm tensioner applied to an engine accessory transmission system.

Background

At present, in part of internal combustion engine accessory transmission systems, a power generation-electric motor unit is arranged, and the power generation-electric motor unit respectively has a power generator function and an electric motor function in different working states. In order to better achieve the change in tension of the drive member in response to two different operating conditions in the accessory drive system, a dual arm tensioner has been developed, as shown in published patent No. CN110848349A, having two tensioning arms and being mounted to the engine through a first pivot center. The bolt passes through the first pivot center and the dual-arm tensioner is assembled to the engine, but in order to ensure that the height of the tensioner pulley is consistent with that of the accessory transmission belt, the height between the swing arm and the engine mounting part must be controlled, and the height space of the joint part of the mounting bolt and the corresponding engine mounting part is limited, so that the height of the threaded part of the bolt is low, the locking force is small, and the assembling reliability is reduced.

There is therefore a need to design a new dual arm tensioner to ameliorate the associated disadvantages.

SUMMERY OF THE UTILITY MODEL

The technical problem that this creation was solved is to provide a quieter both arms tensioning ware.

In order to solve the above technical problem, the present inventor provides a dual-arm tensioner for an internal combustion engine equipped with a generator-motor unit, the internal combustion engine including a crankshaft pulley, a generator-motor pulley, an endless transmission member wrapped around the crankshaft pulley and the generator-motor pulley, the internal combustion engine being provided with a boss for mounting the dual-arm tensioner, the dual-arm tensioner including a first tensioner arm and a second tensioner arm, the first tensioner arm being provided with a first pivot axis about which the first tensioner arm is pivotable, one end of the first tensioner arm being provided with a first tensioner pulley, one end of the second tensioner arm being pivotably hinged to the other end of the first tensioner arm about a second pivot axis, the second pivot axis being offset from the first pivot axis, the other end of the second tensioner arm being provided with a second tensioner pulley, the double-arm tensioner further comprises a base part, the first tensioning arm is sleeved on the base part in a swinging mode, a through hole for an assembling bolt to pass through is formed in the base part, one axial end of the base part is a mounting surface for mounting the double-arm tensioner to an engine, a recessed part for accommodating a boss of the internal combustion engine is arranged at the end part close to the mounting surface of the double-arm tensioner, the bolt penetrates through the through hole to fix the double-arm tensioner on the boss, and the height of the recessed part accounts for 20% -45% of the height of the base part.

The beneficial effect of this creation lies in: when the boss extends into the recess, the distance between the belt wheel on the first tensioning arm and the belt wheel on the second tensioning arm and the mounting surface of the base part is further reduced relative to the mounting surface of the base part, and the overall height of the double-arm tensioner relative to the mounting surface is also greatly reduced. Meanwhile, the part of the assembly bolt matched with the boss, namely the threaded part of the assembly bolt screwed into the boss, is longer, the binding force is larger, the assembly of the double-arm tensioner and the engine is firmer, and the reliability is higher.

Drawings

Fig. 1 is a perspective view of the inventive two-arm tensioner.

FIG. 2 is a schematic cross-sectional view of the inventive dual arm tensioner and a portion of an internal combustion engine component.

Detailed Description

The present dual arm tensioner is described more fully below in conjunction with fig. 1-2.

An internal combustion engine includes a generator-motor unit (not shown) having a drive train including a crankshaft pulley, a generator-motor pulley 42, and an endless transmission member 43 wrapped around the crankshaft pulley, the generator-motor pulley 42.

The internal combustion engine is provided with a dual arm tensioner mounted boss 41, typically the boss 41 is provided on the cylinder of the internal combustion engine, or on the housing of the generator-motor unit, or on an associated bracket. The dual arm tensioner comprises a first tensioning arm 5 and a second tensioning arm 6. The first tensioning arm 5 comprises a first pivot axis 52, about which first pivot axis 52 the first tensioning arm 5 is pivotable, the first pivot axis 52 being arranged outside the range of the endless drive 43.

One end of the first tensioning arm 5 is provided with a first tensioning pulley 51. One end of the second tensioning arm 6 is pivotably hinged to the other end of the first tensioning arm 5 about a second pivot axis 62, which second pivot axis 62 is offset from the first pivot axis 52, and the other end of the second tensioning arm 6 is provided with a second tensioning pulley. A torsion spring (not shown) is provided between the first and second tensioning

arms

5, 6 to bias them towards each other about the pivot axis 62 of the second tensioning arm 6.

The double-arm tensioner further comprises a base part 1, the first tensioning arm 5 is sleeved on the base part 1 in a swinging mode, a bushing 31 is further arranged between the first tensioning arm 5 and the base part 1, the bushing 31 is preferably made of self-lubricating materials, and when the first tensioning arm 5 is under the action of a torsion spring and a transmission system, the bushing 31 generates corresponding damping to slow down the swinging of the first tensioning arm 5. The base 1 is provided with through holes through which the mounting bolts 35 pass. One axial end of the base 1 is a mounting surface 14 for mounting the double-arm tensioner to an engine, a recess 13 for accommodating a boss 41 of the internal combustion engine is arranged at the end close to the mounting surface 14 of the double-arm tensioner, the bolt 35 penetrates through the through hole to fix the double-arm tensioner on the boss 41, and the height of the recess 13 accounts for 20% -45% of the height of the base 1. Preferably, the height of the recess 13 accounts for 30% -35% of the height of the base 1. When the boss 41 protrudes into the recess 13, the distance between the pulleys of the first and second tensioning

arms

5 and 6 and the mounting surface 14 of the base 1 is further reduced relative to the mounting surface 14 of the base 1, and the overall height of the dual-arm tensioner relative to the mounting surface 14 is also greatly reduced. Meanwhile, the part of the assembly bolt 35 matched with the boss 41, namely the threaded part of the assembly bolt 35 screwed into the boss 41, is longer, the binding force is larger, the assembly of the double-arm tensioner and the engine is firmer, and the reliability is higher.

The base 1 includes a first portion 11 having a larger diameter and a second portion 12 having a smaller diameter, the recess 13 is provided in the first portion 11, and the second portion 12 is provided at the other end corresponding to the mounting surface 14.

The second portion 12 extends axially from the radial inner side, the first tensioning arm 5 extends radially outside the second portion 12 and forms an annular receiving portion together with the base 1, and a damper 32 and a compression spring 33 are arranged in the receiving portion on the first tensioning arm 5, sleeved on the second portion 12 and axially abutted against the damper 32. And a retainer ring 34 disposed on the second portion 12 and axially disposed between the mounting bolt 35 and the compression spring. The compression spring 33 provides an axial force and acts on the first tensioning arm 5 via the damping plate 32, damping the pivoting of the first tensioning arm 5. Optionally, a spacer 36 is further disposed between the compression spring 33 and the damper 32 to protect the damper 32 from the compression spring 33.

The technical solutions described above are only for illustrating the embodiments of the present disclosure, and are not limiting on the present disclosure, and equivalent changes made by those skilled in the art according to the present disclosure are all within the protection scope of the present disclosure.

Claims

1. A dual-arm tensioner for an internal combustion engine equipped with a generator-motor unit, the internal combustion engine including a crankshaft pulley, a generator-motor pulley, an endless drive member wrapped around the crankshaft pulley and the generator-motor pulley, the internal combustion engine being provided with a boss on which the dual-arm tensioner is mounted, the dual-arm tensioner including a first tensioner arm provided with a first pivot axis about which the first tensioner arm is pivotable, a first tensioner pulley provided at one end of the first tensioner arm, and a second tensioner arm having one end pivotably hinged to the other end of the first tensioner arm about a second pivot axis, the second pivot axis being offset from the first pivot axis, the other end of the second tensioner arm being provided with a second tensioner pulley,

a torsion spring is arranged between the first tensioning arm and the second tensioning arm to deflect the first tensioning arm and the second tensioning arm towards the directions close to each other around the pivot axis of the second tensioning arm,

the double-arm tensioner also comprises a base part, the first tensioning arm is sleeved on the base part in a swinging way, the base part is provided with a through hole for the assembly bolt to pass through,

the double-arm tensioner is characterized in that one axial end of the base is a mounting surface for mounting the double-arm tensioner to an engine, a recessed part for accommodating a boss of the internal combustion engine is arranged at the end part close to the mounting surface of the double-arm tensioner, the bolt penetrates through the through hole to fix the double-arm tensioner on the boss, and the height of the recessed part accounts for 20% -45% of the height of the base.

2. The dual arm tensioner as in claim 1, wherein: the first pivot axis is disposed outside of the wrap range of the endless drive.

3. The dual arm tensioner as in claim 1, wherein: the height of the concave part accounts for 30-35% of the height of the base part.

4. The dual arm tensioner as in claim 2, wherein: the base portion includes a first portion having a larger diameter and a second portion having a smaller diameter, the recess portion being provided in the first portion, the second portion being provided at the other end corresponding to the mounting surface.

5. The dual arm tensioner as in claim 4, wherein: the second part axially extends from the radial inner side, the first tensioning arm extends from the radial outer side of the second part and forms an annular accommodating part together with the base part, and a damping sheet and a compression spring axially abutted against the damping sheet are arranged on the first tensioning arm in the accommodating part.

6. The dual arm tensioner as in claim 5, wherein: the limiting ring is sleeved on the second portion and is arranged between the assembling bolt and the compression spring in the axial direction.

7. The dual arm tensioner as in claim 5, wherein: and a gasket for protecting the damping sheet from being damaged by the compression spring is arranged between the compression spring and the damping sheet.