JP4380816B2 - Flat clutch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is incorporated in a drive mechanism that moves a driving object such as a corner pole or a rod antenna of an automobile up and down. When the driving object completes an ascending operation or a descending operation, the motor continuously continues. The present invention relates to a flat clutch for avoiding falling into a load state.
[0002]
[Prior art]
In general, this type of flat clutch includes a driving side rotating base coupled to the motor side, a driven side rotating base coupled to the load side, that is, the driven object side, the driving side rotating base, and the driven side rotating base. During normal load driving, the rotational force is frictionally transmitted from the flat plate portion of the driving side rotating base to the flat plate portion of the driven side rotating base, and when the load operation is completed, the flat plate portions slip between each other. It consists of a clutch element that operates to protect the motor from falling into a continuous overload condition.
[0003]
Among these flat plate clutches, the flat plate clutch incorporated in the corner pole drive mechanism generally has a relatively small load on the corner pole, for example, compared to a rod antenna, etc. Since it is not required, it is common to have a small and simplified structure.
[0004]
As an example, this type of flat-plate clutch that has been put to practical use in the past is between a flat plate portion of a driving side rotary base and a flat plate portion of a driven side rotary base that are integrally molded with a resin material. The clutch element has a structure in which an annular elastic ring formed of rubber such as NBR is inserted as a clutch element.
[0005]
[Problems to be solved by the invention]
The conventional flat clutch of the above configuration has the following problems. In the case where a rubber ring such as NBR is used as the clutch element, only a relatively small transmission torque of, for example, about 0.85 kgf.cm can be obtained due to insufficient elastic repulsion. In addition, the rubber such as NBR has a large change in hardness accompanying a change in temperature, and it becomes difficult to obtain a required transmission torque particularly at low temperatures. Incidentally, the slip operation occurs at -40 ° C., and friction transmission cannot be performed at all.
[0006]
An object of the present invention is to provide a small and lightweight flat clutch that has a small pressure fluctuation due to a temperature change, can obtain a sufficiently large transmission torque even at a low temperature, and can always maintain high quality. There is.
[0007]
[Means for Solving the Problems]
In order to solve the above problems and achieve the object, the flat clutch of the present invention is configured as follows. Note that features other than those described below will be clarified in the embodiments.
[0008]
The flat clutch of the present invention is interposed between the driving side rotating base coupled to the motor side, the driven side rotating base coupled to the load side, the driving side rotating base and the driven side rotating base, During normal load driving, the rotational force is frictionally transmitted from the flat plate portion of the drive side rotary base to the flat plate portion of the driven side rotary base. In a flat clutch comprising a clutch element that protects the motor from falling into a continuous overload condition,
The inside is formed of a hollow metal pipe, passes through the shaft center of the driving side rotating base, the driven side rotating base and the clutch element, and expands both ends of the pipe by caulking to make it axial Comprising a rotating shaft that fixes the overall length of the
The clutch element,
A ring-shaped contact ring disposed so that one side surface is in contact with the flat plate portion of the driving side rotating base or the flat plate portion of the driven side rotating base;
The contact ring is inserted in a compressed state between the other side surface of the contact ring and the flat plate portion of the driven side rotary base or the flat plate portion of the drive side rotary base, and the one side surface of the contact ring and the flat plate portion of the drive side rotary base Or an elastic ring having an annular shape that generates a predetermined pressure contact force with the flat plate portion of the driven side rotating base;
The pressure contact portion and the flat plate portion of the plate portion or the driven side rotational base aspect and the driving side rotational base of the contact ring is pressed against a center of the rotation shaft of the driving side rotational body and the driven side rotational base a step portion formed as to repeat irregularities in the circumferential direction to, are characterized and this with a.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
"Constitution"
FIG. 1 is a diagram showing a configuration of a flat clutch according to a first embodiment of the present invention. FIG. 1 (a) is a sectional view of the entire clutch, and FIG. 1 (b) shows a contact ring and an elastic ring which are main parts of a clutch element. Sectional drawing which shows the state overlap | superposed, (c) is sectional drawing of an elastic spacer.
[0010]
In FIGS. 1A to 1C, reference numeral 10 denotes a drive side rotating base coupled to the motor side, and includes an outer cylinder portion 10a and an inner cylinder portion 10b. A gear 11 for receiving power from a motor (not shown) is provided on the outer peripheral surface of the outer cylinder portion 10a.
[0011]
Reference numeral 20 denotes a driven side rotating base coupled to the load side, and has a large diameter cylindrical portion 20a and a small diameter cylindrical portion 20b. A gear 21 for transmitting power to a load (not shown) such as a corner pole is provided on the outer peripheral surface of the small diameter cylindrical portion 20b.
[0012]
A clutch element 30 is interposed between the driving side rotating base 10 and the driven side rotating base 20. That is, as shown in FIG. 1B, the clutch element 30 includes a contact ring 31 formed in an annular shape using, for example, polyacetal resin, and an elastic ring 32 formed in an annular shape using, for example, silicon rubber. Is the main constituent. The contact ring 31 and the elastic ring 32 include an inner peripheral surface of the large-diameter cylindrical portion 20a of the driven-side rotating base 20 that is fitted inside the outer cylindrical portion 10a of the driving-side rotating base 10, and the driving side. The rotating base 10 is accommodated in an annular space that exists between the outer peripheral surface of the inner cylindrical portion 10b.
[0013]
The outer diameter D1 of the contact ring 31 and the elastic ring 32 is set to about φ20, and the inner diameter D2 is set to about φ14. The contact ring 31 has a thickness T1 of about 2 mm, and the elastic ring 32 has a non-compressed thickness T2 of about 4 mm.
[0014]
One side surface (upper side surface in the figure) of the contact ring 31 is disposed so as to be in contact with the flat plate portion existing on the inner bottom portion of the drive side rotating base 10. The elastic ring 32 is inserted in a compressed state between the other side surface of the contact ring 31 and a flat plate portion present on the inner bottom portion of the driven side rotating base 20. Thus, the elastic ring 32 generates a predetermined pressure contact force between one side surface of the contact ring 31 and the flat plate portion of the drive side rotating base 10.
[0015]
Uneven and one side surface of the contact ring 31 and the flat portion of the drive side rotary body 10 is in the pressure contact portion for pressing, along a circumferential direction around the rotational axis of the driving-side rotation body 10 and the driven-side rotating group 20 Steps S are formed so as to repeat the above.
[0016]
2A to 2C are views showing the stepped portion S. FIG. As shown to (a), several uneven | corrugated | grooved parts 10V and 10W are repeatedly formed in the flat plate part of the drive side rotation base | substrate 10 along the circumferential direction. Further, as shown in (b) and (c), a plurality of concave and convex portions 31V and 31W are repeatedly formed on one side of the contact ring 31 along the circumferential direction so as to correspond to the concave and convex portions 10V and 10W. Yes.
[0017]
Returning to FIG. The step size TS of the step portion S is set to 0.3 mm to 0.4 mm. Thus, the clutch element 30 frictionally transmits the rotational force from the flat plate portion of the driving side rotating base 10 to the flat plate portion of the driven side rotating base 20 during normal load driving. When the operation of the load is completed, the pressure contact portion where the flat plate portions are pressed against each other (actually, the pressure contact portion between the flat plate portion of the drive side rotating base 10 on which the stepped portion S is formed and one side surface of the contact ring 31). Slips to protect the motor from falling into a continuous overload condition.
[0018]
Reference numeral 40 denotes an assembly member having a substantially cylindrical shape, and the shaft cylinder portion is inserted into the hollow portion of the driven side rotary base 20 from below in the figure via an annular elastic spacer 41 and a silencing metal washer 42. Has been. A metal pipe 43 serving as a rotation shaft is inserted so as to penetrate the shaft center portion of the assembly member 40 and the shaft center portion of the drive side rotating base 10 in common. Both end openings 43 a and 43 b of the metal pipe 43 are crimped so as to expand at the opening end of the drive side rotating base 10 and the opening end of the assembly member 40. Thus, the three members of the driving side rotating base 10, the driven side rotating base 20, and the assembly member 40 are integrated by the metal pipe 43 and fixed so that the overall length L in the axial direction is constant. Therefore, in the flat clutch in the present embodiment, the change in the overall length L in the axial direction due to the thermal expansion of each component due to the temperature change is suppressed, and the transmission torque is stabilized.
[0019]
"Action"
In this embodiment, since the step size TS of the step portion S is set to 0.3 mm to 0.4 mm, an initial torque of 3.5 to 4.5 kgf.cm can be obtained as shown in FIG. . As a result, an initial operating force of 4.2 to 5.5 kgf can be obtained as shown in FIG.
[0020]
FIG. 4A is a diagram showing a change state of the transmission torque value during one rotation of the flat clutch according to the present embodiment. As shown in the figure, during one rotation (0 ° to 360 °), a transmission torque with a maximum torque of 3.5 kg-cm and an intermediate torque of 1.3 kg-cm is obtained.
[0021]
FIG. 4B is a diagram showing the operating durability performance (torque reduction state) with respect to temperature change of the flat clutch according to the present embodiment. In the “product of the present invention” with a step, as shown by the solid line, when the initial torque setting value is 3.5 kgf.cm at a room temperature of 20 ° C., when the temperature reaches −40 ° C., the torque is 2.75 kgf.cm. It becomes. Therefore, in this case, the operating force standard 4.6 ± 1.4 kgf shown in FIG. The same value is obtained when the temperature reaches + 85 ° C.
[0022]
Other conditions are those not provided with a step be the same, as shown by the broken line, the temperature is -40 ° C., the torque becomes 2.05Kgf.Cm. Therefore, it does not conform to the operating force standard 4.6 ± 1.4 kgf shown in FIG.
[0023]
In the case of a conventional product, the operating force standard of 4.6 ± 1.4 kgf cannot already be satisfied at room temperature.
Since the flat clutch of the present embodiment is extremely small and can obtain a sufficiently large torque, it can be applied not only to an automobile corner pole drive mechanism but also to an automobile rod antenna drive mechanism or the like.
[0024]
(Modification)
The flat clutch shown in the embodiment includes the following modifications.
The first contact ring is brought into contact with the flat plate portion of the driving-side rotary base 10, the second contact ring is brought into contact with the flat plate portion of the driven-side rotary base 20, and a single or plural elasticity is provided between the two contact rings. A ring is interposed.
In order to suppress frictional noise, the driving side rotating base 10 and the driven side rotating base 20 are made of polyacetal resin (Duracon “trade name”), and the contact ring 31 is made of another type of polyacetal resin (Duranex having different physical properties). "Product name").
-Using an elastic ring made of a metal elastic member.
[0025]
(Features of the embodiment)
[1] The flat clutch in this embodiment is
A drive-side rotary base 10 coupled to the motor side, a driven-side rotary base 20 coupled to the load side, and the drive-side rotary base 10 and the driven-side rotary base 20 are interposed between the drive side rotary base 10 and the normal load drive. , The rotational force is frictionally transmitted from the flat plate portion of the drive side rotary base 10 to the flat plate portion of the driven side rotary base 20, and when the load operation is completed, the flat plate portions slip to each other and the motor continues. In a flat clutch comprising a clutch element 30 that protects against a typical overload condition,
The clutch element 30 is formed of a resin material in which the friction transmission portion of the clutch element 30 has a small change in physical properties due to a temperature change (in order to suppress a change in frictional transmission force due to a temperature change and maintain high quality), and A stepped portion S that repeats irregularities along the circumferential direction around the rotation axis 43 of the driving side rotating base 10 and the driven side rotating base 20 at the friction transmission portion (to obtain a high output torque clutch). It is characterized by being formed.
[2] The flat clutch in the present embodiment is the flat clutch according to [1],
The clutch element S includes an annular contact ring 31 disposed so that one side surface thereof is in contact with the flat plate portion of the driving side rotary base 10 or the flat plate portion of the driven side rotary base 20, and the contact ring 31. Between the other side surface and the flat plate portion of the driven side rotary base 10 or the flat plate portion of the drive side rotary base 10 in a compressed state, and one side surface of the contact ring 31 and the flat plate of the drive side rotary base 10 A ring-shaped elastic ring 31 that generates a predetermined pressure contact force with the flat plate portion of the driven side rotating base 20, one side surface of the contact ring 31, the flat plate portion of the driving side rotating base 10, or the A step portion S formed so as to be repeatedly concave and convex along a circumferential direction around the rotation axis is provided at a pressure contact portion where the flat plate portion of the driven side rotating base 20 is pressed.
[3] The flat clutch in the present embodiment is the flat clutch according to [1],
The clutch element S is connected to a first contact ring having an annular shape disposed so that one side surface thereof is in contact with the flat plate portion of the driving side rotating base 10 and the flat plate portion of the driven side rotating base 20. An annular second contact ring disposed so that one side surface is in contact with the other side surface of the first contact ring and the other side surface of the second contact ring; A predetermined pressure contact force is generated between one side surface of the contact ring and the flat plate portion of the driving side rotating base 10 and between one side surface of the second contact ring and the flat plate portion of the driven side rotating base 20. A ring-shaped elastic ring 32, a pressure contact portion between one side surface of the first contact ring and the flat plate portion of the driving side rotating base 10, and one side surface of the second contact ring and the driven side rotating base 20 The rotating shafts 43 are respectively placed in pressure contact portions with the flat plate portion of the rotating shaft 43. And the step portion S formed as to repeat irregularities along a circumferential direction centered, it is characterized by comprising a.
[4] The flat clutch in the present embodiment is the flat clutch according to [2] or [3],
The press contact portion is formed of a resin material having little change in physical properties due to temperature change.
[5] A flat clutch in the present embodiment is the flat clutch according to [1] or [4],
The resin material is a polyacetal resin.
[6] The flat clutch in the present embodiment is the flat clutch according to [1] or [4],
The resin material is characterized in that it exhibits different physical properties at least under the same temperature (in order to suppress clutch operation noise).
[7] The flat clutch in the present embodiment is the flat clutch according to any one of [1], [2], and [3],
The step portion is characterized in that the step size is set to 0.3 mm to 0.4 mm so that a torque of 3.5 to 4.5 [kgf · cm] is generated.
[0026]
【The invention's effect】
In the present invention, the frictional transmission part of the clutch element is formed of a resin material having a small change in physical properties due to a temperature change, and a stepped portion that repeats unevenness is formed along the circumferential direction around the rotation axis. . Therefore, according to the present invention, there is provided a small and lightweight flat clutch that has a small pressure fluctuation due to a change in temperature, can obtain a sufficiently large transmission torque even at a low temperature, and can always maintain high quality. Can provide.
[Brief description of the drawings]
1A and 1B are views showing a configuration of a flat clutch according to a first embodiment of the present invention, in which FIG. 1A is a longitudinal sectional view of the entire clutch cut along an axial center, and FIG. Sectional drawing shown, (c) is sectional drawing of an elastic spacer.
FIGS. 2A and 2B are diagrams showing a configuration of a stepped portion in the flat clutch according to the first embodiment of the present invention, wherein FIG. 2A is an inner plan view of a drive side rotating base, and FIGS. FIG.
FIG. 3 is a view for explaining the operation of the flat clutch according to the first embodiment of the present invention.
FIG. 4 is a view for explaining the operation of the flat clutch according to the first embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Drive side rotary base | substrate 20 ... Driven side rotary base | substrate 30 ... Clutch element 31 ... Contact ring 32 ... Elastic ring S ... Step part 10V, 31V ... Convex part 10W, 31W ... Concave part

Claims (4)

A drive-side rotary base coupled to the motor side, a driven-side rotary base coupled to the load side, and the drive-side rotary base and the driven-side rotary base. The rotational force is frictionally transmitted from the flat plate portion of the driving side rotating base to the flat plate portion of the driven side rotating base, and when the load operation is completed, the flat plate portions slip to each other and the motor is continuously overloaded. In a flat plate clutch comprising a clutch element that protects against falling into
The inside is formed of a hollow metal pipe, passes through the shaft center of the driving side rotating base, the driven side rotating base and the clutch element, and expands both ends of the pipe by caulking to make it axial Comprising a rotating shaft that fixes the overall length of the
The clutch element,
A ring-shaped contact ring disposed so that one side surface is in contact with the flat plate portion of the driving side rotating base or the flat plate portion of the driven side rotating base;
The contact ring is inserted in a compressed state between the other side surface of the contact ring and the flat plate portion of the driven side rotary base or the flat plate portion of the drive side rotary base, and the one side surface of the contact ring and the flat plate portion of the drive side rotary base Or an elastic ring having an annular shape that generates a predetermined pressure contact force with the flat plate portion of the driven side rotating base;
The pressure contact portion and the flat plate portion of the plate portion or the driven side rotational base aspect and the driving side rotational base of the contact ring is pressed against a center of the rotation shaft of the driving side rotational body and the driven side rotational base a step portion formed as to repeat irregularities in the circumferential direction, flat-plate clutch, wherein the this with a. An assembly member which is inserted between the driven side rotary base and the rotary shaft so as to pass through the rotary shaft and restricts movement of the driven side rotary base in the axial direction;
The both ends of the pipe that are widened interfere with the end surfaces of the drive side rotary base and the assembly member, so that the drive side rotary base, the driven side rotary base, and the assembly member are integrated, and the overall length is constant. The flat clutch according to claim 1 , wherein The flat plate clutch according to claim 2 , further comprising a washer provided between the driven side rotating base and the assembly member in the axial direction. 2. The flat plate according to claim 1, wherein the contact ring and the elastic ring are formed of a resin material that has a small change in physical properties due to a temperature change and exhibits different physical properties at least under the same temperature. Shaped clutch.

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