JPH0210350Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of an oil-type damper that brakes the rotation of the rotor by filling a narrow gap in a housing that rotatably houses a rotor with oil and using the viscous resistance of the oil. .

In Utility Model Application No. 57-86756, the present applicant built a flexible membrane with soft elasticity in addition to the rotor into the housing, and the thermal expansion of the oil was absorbed by this flexible membrane, causing the oil to flow out of the housing. An oil-type damper that prevents leakage was proposed, but the present invention follows the features of the previous proposal and further improves it by taking into account the manufacturing process, that is, the ease of assembly.

That is, in the past, oil such as silicone grease was applied to both sides and the outer circumference of the rotor's braking disk using a brush, and the rotor was assembled into a housing, but in this case, the shaft of the rotor is made hollow and the rotation After the child is housed in the housing and assembled, oil can be supplied from one end of the shaft protruding outside the housing through the hollow part of the shaft, and will be described below with reference to the illustrated embodiment.

1 and 2 are a base body and a cap made of plastic that constitute a cylindrical housing, and the base body has a cylindrical wall 3 with a bottom and a mounting piece 4 that extends outward from the cylindrical wall 3 and is used to fix it to the equipment in use. . Hozu 1/2
The lid wall 5 has a fitting wall 6 that fits into the lid wall 5, and a boss 7 that projects axially outward from the center of the outer surface of the lid wall, and a series of center holes 8 pass through the lid wall 5 and the boss.

The inner periphery of the cylindrical wall 3 and the outer periphery of the tip of the fitting wall 6 are provided with annular protuberances that snap into engagement when the fitting wall 6 is pushed into the inner periphery of the cylindrical wall and the lid wall 5 closes the open surface of the cylindrical wall. Snap engagement device 9 consisting of a ring groove 9a and an annular groove 9b
There is.

Reference numeral 10 denotes a rotor, which in this embodiment has a brake disk 11 and a hollow shaft 12 protruding from the center of one side of the rotor. The gear 13 is fixed to the protruding end. The diameter of the brake disc 11 is slightly smaller than the inner diameter of the fitting wall 6.

The brake disc 11 has one or more (here, four at equal intervals in the circumferential direction) window holes 14 around the shaft 12, and a cylindrical wall on the surface 11b opposite to the surface 11a having the shaft 12. A plurality of protrusions 15 are distributed in the circumferential direction and are in contact with the bottom surface of the protrusions 3 to maintain a gap. This gap is provided to allow oil supplied through the hollow portion to flow out from the inner end of the shaft 12 into the housing, as will be described later.

Reference numeral 16 indicates a soft and elastic flexible membrane, which is pushed and deformed by the oil when the oil expands thermally, and absorbs the volumetric expansion of the oil. This flexible membrane is made of synthetic rubber or soft plastic, such as polyethylene or polypropylene, preferably made of a material with a small thermal change, and is formed into a thin wall. An annular lip 16a is formed to prevent leakage to the outside along the circumference, and an annular protrusion 16b and an outer edge 16c are provided on the outer periphery.

The outer diameter of the flexible membrane is larger than the inner diameter of the cylindrical wall 3, and in this embodiment, the outer edge 1 is formed in the annular groove 9b on the inner periphery of the cylindrical wall.
6c is fitted into the annular groove and fixed to the housing by a cap that is snapped into the annular groove to maintain a distance from the surface 11a of the brake disc 11.

Incidentally, the gear 13 is provided with a pin 13a that is pushed into the hollow part of the shaft 12.

To assemble this damper, attach the flexible membrane 1 to the shaft 12.
After fitting the inner circumference of 6, insert the shaft into the center hole 8 of the cap.
Penetrate it from the inside and bring it out from the tip of boss 7,
The brake disc 11 and the flexible membrane 16 are housed within the cylindrical wall of the base body, and the cap is pushed into the inner periphery of the cylindrical wall. Thereby, the cap 2 is fixed to the base body 1 by the snap engagement device 9 to form a housing, and the outer edge 16c of the flexible membrane 16 is simultaneously fixed to the housing. At this time, the annular protrusion 16b of the flexible membrane 16
is in contact with the bottom surface of the lid wall 5 of the cap 2 and the flexible membrane 16
Stabilizes the shape of the fixed state.

Next, oil is injected into the hollow portion 12' of the shaft 12 from the outer end using a syringe-like oil filler or the like. As a result, the oil 17 flows out into the gap between the surface 11b of the brake disk and the bottom of the cylindrical wall 3, which are kept apart by the projections 15, and fills this gap, and also passes through the outer periphery of the brake disk and the window hole 14 to the other surface. It also flows to the side 11a and fills the gap between the flexible membrane 16 and this surface 11a.

Therefore, it is sufficient to insert the pin 13a of the gear 13 into the hollow part of the shaft 12 from the outer end and close it. The oil filled in the housing reaches the outer edge 16c of the flexible membrane 16.
is pressed and fixed in the annular groove 9b of the housing by the annular protuberance 9a of the cap 2, so that the outer periphery is sealed, while the annular lip 1 on the inner periphery of the flexible membrane
Since the rotor 6a is in close contact with the periphery of the hollow shaft 12 of the rotor 10, the oil is sealed.

In order to prevent the gear 13 from rotating idly relative to the shaft, the outer end 12a of the shaft 12 has an oval-shaped outer shape, and an oval-shaped recess is formed in the gear around the base of the pin 13a. In addition, the cross-sectional shape of the base of the pin 13a and the cross-sectional shape of the outer end of the hollow hole of the shaft into which this pin is inserted are made into an oval shape that fits each other, but only one of them is required. The shape may be any shape other than the oval shape, such as a D shape or a polygon.

If one or more window holes 14 are provided in the brake disc as in this embodiment, oil can be supplied by having the window holes 14 hidden outside the outer periphery of the disc on the surface 11a side of the disc. Therefore, the injection time is shortened and the braking effect is also increased.

In order to improve the circulation of the injected oil, in this embodiment, a cross-shaped cavity 11' is provided concentrically in the brake disc 11, and a cavity 11 is provided in the surface 11a.
A concentric thin disc part 18 is formed to close the central part of the protrusion 1', and each end of the cross-shaped space 11' that is not closed by the thin disc part 18 is made into a window hole 14, and the protrusion 1
5 protrudes from the four corners of the cross shape on the surface 11b, and the hollow shaft 12 protrudes from the thin disk portion 18.
The inner end of the hollow portion 12' opens into the thin disk portion 18. Therefore, the injected oil flows out from the inner end of the shaft into the cross-shaped cavity 11' and flows through the cavity through the window hole 1.
4, a portion of which passes through the window hole 14 to fill the gap on the side of the surface 11a of the brake disk, and the remaining portion fills the gap maintained by the protrusion 15.

As is clear from the above, according to the present invention, it is possible to save the trouble of applying oil to the brake disc using a brush, etc., and since the required amount of oil to be injected into one damper is almost constant, the amount of oil to be injected per time can be reduced. A lubricator that can control the amount of oil needed, for example, a cylinder that allows the oil inside to be seen through like a syringe, is equipped with a scale that indicates the amount of lubricant per time, allowing the accurate amount to be injected.
Therefore, when oil is applied with a brush or the like, there is a problem that the amount of oil applied varies and the braking effect is not constant, but according to the present invention, a damper with a uniform braking effect can be provided.

In the illustrated embodiment, one rotor is attached to one housing, but a partition wall is provided in the housing so that the cylindrical walls protrude from both sides of the partition wall. Two sets of rotors may be installed.

[Brief explanation of the drawing]

The drawings show an embodiment of the damper of the present invention, in which Fig. 1 is a cross-sectional view of the assembled state, Fig. 2 is a perspective view of the disassembled state, and Fig. 3 is a front view of one half of the rotor.
The other half is an explanatory diagram seen from the back, and in the figure, 1 is the housing, 10 is the rotor, 11 is the brake disc, 12
12 is a shaft, 12' is a hollow part of the shaft, 15 is a protrusion, and 16 is a flexible membrane.

Claims (1)

[Claims for Utility Model Registration] (1) A rotor comprising a housing, a shaft and a brake disc, with a part of the shaft protruding outside the housing and the rest being housed in the housing, and a rotor with a shaft of the rotor. A flexible membrane that is rotatably fitted and whose outer periphery is fixed to the housing and housed in the housing, and a gear that is fixed to the end of the rotor shaft that protrudes outside the housing to receive rotational force transmission. and filled in the housing adjacent to the flexible membrane,
In an oil-type damper consisting of oil that immerses the brake disk of the rotor, the shaft of the rotor is hollow, and the brake disk has protrusions that abut against the inner surface of the housing and maintain a gap between it and the inner end of the shaft. , an oil-type damper characterized in that the gear is designed to close the outer end of the hollow part of the shaft. (2) The braking disc is an oil-type damper according to claim (1) for utility model registration, which has a window hole on the disc surface.