JPH059555Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a torsional damper that mainly absorbs torsional vibrations of a rotating shaft such as a crankshaft of an engine.

[Conventional technology]

As a type of torsional damper, as shown in FIG.
Vibration ring 10 also made of cast metal via 02
In the torsional damper in which the vibration ring 103 is concentrically joined, a pulley groove 1 is formed on the outer circumferential surface of the vibration ring 103 for the purpose of using the rotational force from the crankshaft transmitted to the damper as a drive source for other equipment.
04, or (and) a sheet metal pulley member 105 on one side of the hub 101 with a bolt 106.
There are some things that are stuck.

[Problem that the invention attempts to solve]

However, when fixing the pulley member 105 to the hub 101 with bolts 106, it is necessary to increase the wall thickness of the hub 101 at least at the bolt threaded portion 107, which increases the weight. The processing cost is high because of the processing involved, and the bolts 106 and washers 109 are also expensive.
The disadvantage is that the number of parts increases because of the need for

Therefore, the present invention was developed with the aim of reducing the weight of the damper, as well as reducing processing costs and the number of parts.

[Means for solving problems]

In order to achieve the above object, the torsional damper of the present invention is provided with an outer peripheral ring on a cast metal hub, a vibration ring connected to the outer peripheral side of the outer peripheral ring via rubber, and a sheet metal pulley member connected to the hub. In the torsional damper, the pulley member is provided with a fitting ring having a diameter larger than the pulley member main body having a pulley groove, the fitting ring is fitted on the inner circumferential side of the outer circumferential ring, and the fitting ring is fitted on the inner circumferential side of the outer circumferential ring. It is characterized in that a recess is provided on the inner peripheral surface, a projection is provided on the outer peripheral surface of the fitting ring, and the recess and the projection are engaged.

[Effect]

A fitting ring provided on a sheet metal pulley member is fitted onto the inner circumferential side of the outer circumferential ring of the cast hub with a predetermined interference, thereby integrating the hub and the pulley member. Further, a recess is provided on the inner peripheral surface of the outer peripheral ring, a projection is provided on the outer peripheral surface of the fitting ring, and the recess and the projection are engaged,
This prevents the pulley member from falling off the hub.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, an outer circumferential ring 1a is formed on a cast metal hub 1, and a cast metal vibration ring 3 is connected to the outer circumferential side of the outer circumferential ring 1a via rubber 2.
A pulley member 4 made of sheet metal is fixed to. The pulley member 4 has a pulley member main body 4a having a pulley groove 4b, and a fitting ring 4 having a larger diameter than the pulley member main body 4a.
c is integrally molded, and this fitting ring 4c
is fitted onto the inner circumferential side of the outer circumferential ring 1a with a predetermined interference. Also, a recess 5 is formed on the inner circumferential surface of the outer circumferential ring 1a.
A convex portion 6 is formed on the outer peripheral surface of the fitting ring 4c by punching, and the concave portion 5 and the convex portion 6 engage with each other.

The torsional damper having the above configuration has a fitting ring 4c formed from a sheet metal pulley member 4 fitted onto the inner circumferential side of the outer ring 1a of the cast hub 1 with a predetermined interference. and the pulley member 4 to prevent relative movement of both members, especially the outer ring 1.
A recess 5 is formed on the inner circumferential surface of the fitting ring 4c, a protrusion 6 is formed on the outer circumferential surface of the fitting ring 4c, and the pulley member 4 falls off from the hub 1 because the recess 5 and the protrusion 6 are engaged. It is possible to achieve these effects by reducing the weight of the torsional damper and further reducing processing costs and the number of parts.

Furthermore, in the torsional damper having the above configuration, an endless belt (not shown) is wound around the outer circumferential side of the pulley groove 4b with a predetermined tension, and when the pulley member 4 is pulled and deformed by this tension. The fitting ring 4c of the pulley member 4 is connected to the outer peripheral ring 1a of the hub 1.
Since it is deformed so as to be pressed against it, it is possible to further strengthen the engagement between the concave portion 5 and the convex portion 6 by this pressing force.

In another embodiment shown in FIG. 2, the recessed portion 5 is formed to have a substantially triangular cross section, and the convex portion 6 is provided with a slot 7 in the axial end edge of the fitting ring 4c, and then extends the edge in the substantially outer circumferential direction. The first
The same effects as in the embodiment are achieved.

[Effect of idea]

As explained above, in the torsional damper of the present invention, a fitting ring having a pulley groove and a larger diameter than the pulley member body is provided in the pulley member, the fitting ring is fitted on the inner circumferential side of the outer circumferential ring of the hub, A concave part is provided on the inner circumferential surface of the outer circumferential ring, a convex part is provided on the outer circumferential surface of the mating ring, and the concave part and the convex part are engaged, and it is used for fixing parts such as bolts and taps for the bolt holes on the other side. No machining is required, and since no bolt holes are required, the wall thickness of the hub can be reduced, reducing machining costs, the number of parts, and weight.

In addition, in the torsional damper of this invention,
An endless belt is wound around the outer circumferential side of the pulley groove with a predetermined tension, so that when the pulley member is pulled and deformed by this tension, the fitting ring of the pulley member is pressed against the outer circumferential ring of the hub. Because of the deformation, this pressing force can further strengthen the engagement between the concave portion and the convex portion.

[Brief description of the drawings]

FIG. 1 is a half-cut sectional view showing an embodiment of the present invention;
FIG. 2 is a sectional view of a main part showing another embodiment, and FIG. 3 is a half-cut sectional view showing a conventional example. 1...Hub, 1a...Outer ring, 2...Rubber, 3
... Vibration ring, 4 ... Pulley member, 4a ... Pulley member main body, 4b ... Pulley groove, 4c ... Fitting ring, 5 ... Recess, 6 ... Convex part, 7 ... Slot,
8... Suriwari.

Claims (1)

[Scope of utility model registration request] A torsional damper in which an outer peripheral ring 1a is provided on a cast metal hub 1, a vibration ring 3 is connected to the outer peripheral side of the outer peripheral ring 1a via rubber 2, and a sheet metal pulley member 4 is fixed to the hub 1, A pulley member main body 4 having a pulley groove 4b in the pulley member 4
A fitting ring 4c having a larger diameter than a is provided, and the outer peripheral ring 1a
The fitting ring 4c is fitted on the inner circumferential side of the outer circumferential ring 1a, a recess 5 is provided on the inner circumferential surface of the outer circumferential ring 1a, a protrusion 6 is provided on the outer circumferential surface of the fitting ring 4c, and the recess 5 and the convex Part 6
A torsional damper characterized by engaging.