JPH07208548A - Damper - Google Patents

Abstract

PURPOSE:To reduce the occupation space in the axial direction by shortening the length in this direction and to reduce the quantity of parts by obviating the necessity of a stopper member for exclusive use, as to a torque variation absorbing damper which connects a hub and a pulley connected with the hub in free revolution through a bearing, through a coupling rubber, and is equipped with a torsion damper part. CONSTITUTION:A bearing 2 is arranged on the outer peripheral side of a cylinder part 1d installed on a hub 1, and a torsional damper part 7 is arranged on the inner peripheral side of the cylinder part 1d. Further, a sleeve 8 fitted in the hub 1 is formed on the torsional damper part 7, and a stopper 11 which is engaged with the circumferential direction and restricts the relative revolution between the hub 1 and the sleeve 3 to a prescribed angle is installed on the sleeve 8 and the pulley 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper, and more particularly, to a damper that occurs on the crankshaft side when torque is transmitted from the crankshaft of an engine to various accessories via the damper and an endless belt. The present invention relates to a torque fluctuation absorbing damper that absorbs torque fluctuations that are generated and thus smoothly rotates an endless belt and an auxiliary machine.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
A torque fluctuation absorbing damper in which a hub 23 and a pulley 23 rotatably connected to the hub 21 via a bearing 22 are connected via a coupling rubber 24 and a torsional damper portion 25 is provided (actually, is known. Fairness 3-25
455).

However, in the above-mentioned conventional damper, since the bearing 22, the coupling rubber 24 and the torsional damper portion 25 are arranged in a line in the axial direction, the length of the damper in the axial direction is long, and therefore, in this direction. There is a problem that the occupied space of the damper is large. Dedicated stopper members 27 and 28 are fitted on the outer peripheral side of the hub 21 and the inner peripheral side of the pulley 23, and by combining the pair of stopper members 27 and 28, as shown in FIG. Since the stopper 26 that limits the relative rotation of 23 to a predetermined angle is set,
Since the pair of stopper members 27 and 28 are required, there is a problem that the number of parts of the damper is large.

[0004]

SUMMARY OF THE INVENTION In view of the above points, it is an object of the present invention to provide a damper having an axial length shorter than that of the conventional one, and thus occupying space in this direction is smaller than that of the conventional damper. Further, it is an object of the present invention to provide a damper which requires less dedicated stopper member and thus has a smaller number of parts.

[0005]

To achieve the above object, the damper of the present invention connects a hub and a pulley rotatably connected to the hub via a bearing through a coupling rubber. In a damper provided with a torsional damper part, the bearing is arranged on the outer peripheral side of a cylindrical part provided on the hub, and the torsional damper part is arranged on the inner peripheral side of the cylindrical part (claim 1 ). Further, in the damper according to claim 1, a sleeve fitted to the hub is provided in the torsional damper portion, and the sleeve and the pulley are circumferentially engaged with each other so that relative rotation of the hub and the pulley is within a predetermined angle. It has been decided to provide a stopper for limiting (claim 2).

[0006]

When the hub is provided with a rim-shaped cylindrical portion and the bearing is arranged on the outer peripheral side of the cylindrical portion and the torsional damper portion is arranged on the inner peripheral side of the cylindrical portion, the bearing and the torsional damper portion are joined together. Since the dampers are arranged in the radial direction, the axial length of the damper can be made shorter than before. Further, if a stopper for limiting the relative rotation of the hub and the pulley to a predetermined angle is provided on the sleeve and the pulley of the torsional damper section, a dedicated stopper member becomes unnecessary.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.

As shown in FIG. 1, a hub 1 integrally includes a cylindrical mounting portion 1a for a crankshaft (not shown), a flange portion 1b, a first cylindrical portion 1c, and a second cylindrical portion 1d. The pulley 3 is rotatably connected to the outer peripheral side of the second cylindrical portion 1d via the bearing 2 and the hub 1 and the pulley 3 are interposed between the first cylindrical portion 1c and the pulley 3. And a torsional damper portion 7 is provided on the inner peripheral side of the second cylindrical portion 1d. The hub 1 and the pulley 3 are each formed of a predetermined metal into an annular shape, and the coupling rubber 4 is formed of a predetermined rubber into an annular shape.

The bearing 2 is a resin cylindrical body.
The coupling rubber 4 is vulcanized and adhered to the mounting sleeves 5 and 6 arranged on the inner peripheral side and the outer peripheral side, and the mounting sleeve 5 on the inner peripheral side is fitted to the outer peripheral side of the first cylindrical portion 1c. At the same time, the mounting sleeve 6 on the outer peripheral side is fitted to the inner peripheral side of the pulley 3 so as to be fixed to each of the hub 1 and the pulley 3. By this fitting, the mounting sleeve 5 on the inner peripheral side is slightly expanded in diameter from before the fitting, and the mounting sleeve 6 on the outer peripheral side is slightly contracted in diameter from before the fitting. The rubber 4 is precompressed to enhance its durability.

The torsional damper portion 7 is the second cylindrical portion 1
the sleeve 8 fitted on the inner peripheral side of d, and the sleeve 8
And a mass body (also referred to as a vibrating ring) 10 connected to the inner peripheral side of the hub via an elastic body 9, and as a whole, the mounting portion 1a of the hub 1, the flange portion 1b, and the second cylindrical portion 1 are provided.
It is compactly housed in an annular space 1e surrounded by d. The sleeve 8 and the mass body 10 are each formed of a predetermined metal into an annular shape, and the elastic body 9 is formed of a predetermined rubber into an annular shape, and the sleeve 8 and the mass body 1 are formed.
0 is vulcanized and adhered. The torsional damper portion 7 constitutes a kind of resonance system for the torsional vibration generated in the crankshaft, and absorbs and suppresses the torsional vibration.

A stopper projection 8a is formed integrally with one end of the sleeve 8 in the axial direction toward the outside in the radial direction. The stopper projection 8a and the stopper recess 3a provided in the pulley 3 are combined to form a hub 1 and a pulley. A stopper 11 for limiting the relative rotation of No. 3 to a predetermined angle is set. Further, the coupling rubber 4 is attached to the stopper protrusion 8a of the sleeve 8.
In preparation for the mounting of (1), one end of the bearing 2 in the axial direction (the right end in the figure) is brought into contact.

The damper having the above structure has the following effects. Since the bearing 2 is arranged on the outer peripheral side of the second cylindrical portion 1d of the hub 1 and the torsional damper portion 7 is arranged on the inner peripheral side of the second cylindrical portion 1d, the bearing 2
The torsional damper portion 7 is arranged in the radial direction with the second cylindrical portion 1d interposed therebetween. Therefore, since the axial length of the damper is shorter than in the conventional case, the space occupied by the damper in this direction can be made smaller than in the conventional case. Since the torsional damper portion 7 is compactly housed in the annular space 1e surrounded by the mounting portion 1a of the hub 1, the flange portion 1b and the second cylindrical portion 1d, not only in the axial direction but also in the radial direction. Also, the occupied space is set as small as possible. Since the stopper 11 that limits the relative rotation of the hub 1 and the pulley 3 to a predetermined angle is provided on the sleeve 8 of the torsional damper portion 7 and the pulley 3, a dedicated stopper member is not necessary. Therefore, the number of parts can be reduced by that amount.

[0013]

The present invention has the following effects. Since the bearing is arranged on the outer peripheral side of the cylindrical portion provided on the hub and the torsional damper portion is arranged on the inner peripheral side of the cylindrical portion, the bearing and the torsional damper portion are arranged in the radial direction across the cylindrical portion. . Therefore, since the axial length of the damper is shorter than in the conventional case, the space occupied by the damper in this direction can be made smaller than in the conventional case. Since a stopper that restricts the relative rotation of the hub and the pulley to a predetermined angle is provided on the sleeve and the pulley of the torsional damper, a dedicated stopper member is unnecessary. Therefore, the number of parts can be reduced by that amount.

[Brief description of drawings]

FIG. 1 is a half sectional view of a damper according to an embodiment of the present invention.

FIG. 2 is a half-cut sectional view of a damper according to a conventional example.

FIG. 3 is a sectional view showing the structure of a stopper.

[Explanation of symbols]

 1 hub 1a mounting portion 1b flange portion 1c first cylindrical portion 1d second cylindrical portion 1e space 2 bearing 3 pulley 3a stopper recess 4 coupling rubber 5,6 mounting sleeve 7 torsional damper portion 8 sleeve 8a stopper protrusion 9 elastic body 10 Mass 11 Stopper

Claims (2)

[Claims] 1. A hub (1) and a pulley (3), which is rotatably connected to the hub (1) via a bearing (2), are connected via a coupling rubber (4) and are torsionally connected. In the damper provided with the damper part (7),
The bearing (2) is arranged on the outer peripheral side of the cylindrical portion (1d) provided on the hub (1), and the cylindrical portion (1) is arranged.
A damper characterized in that the torsional damper portion (7) is arranged on the inner peripheral side of d). 2. The damper according to claim 1, wherein the torsional damper portion (7) is provided with a sleeve (8) fitted to the hub (1), and the sleeve (8) and the pulley (3) are provided with:
The hub (1) and the pulley (3) are engaged in the circumferential direction.
(11) that limits the relative rotation of the robot to a specified angle
A damper characterized by having.