TW201546369A - Drive device - Google Patents

Abstract

A drive device (1) is provided with a linear or band-like shape-memory alloy member (2) that contracts by heat generation when energized, a base member (3) that is held with the both ends of the shape-memory alloy member (2) fixed in position, and a movable member (4) that is movable to the base member (3), the movable member (4) being disposed with the movable member (4) in contact with the shape-memory alloy member (2), the movable member (4) being moved to the base member (3) in conjunction with the contraction by the energization of the shape-memory alloy member (2), wherein at least one of the base member (3) and the movable member (4) is molded in insulating resin that contains ceramic powders.

Description

Drive unit

The present invention relates to a driving device which mainly utilizes a shape memory alloy used for generating an actuator for vibration or the like.

In the prior art, the driving device known to all is driven by the characteristics of the shape memory alloy, that is, the deformation is performed by applying electric force to a certain temperature (operating temperature) or more. The characteristics that can be shrunk (for example, refer to Patent Document 1).

The driving device includes an insulating base member having a concave portion on the upper surface portion and a movable member opposed to the base member, and a plurality of linear shape memory alloy materials are arranged in parallel: The concave portion of the base member is in a curved state, and the shape memory alloy material shrinks due to heat generation generated when the opposing faces are energized.

When the driving device is not energized, the shape memory alloy material is formed into a curved state in cooperation with the concave portion, and when the shape memory alloy wire is energized and heated to a certain temperature or higher in this state, it will be borrowed. The shape memory alloy wire is contracted by superelasticity, and the movable member is pressed by it to relatively move in a direction separating from the base member.

On the other hand, when the energization state of the shape memory alloy wire is released and the temperature of the shape memory alloy wire is lowered to a constant temperature or lower, the movable member is returned to the original position by its own weight, and the shape memory alloy wire is restored with the above operation. To a curved state (shape when not energized).

In the driving device using the shape memory alloy described above, since the operating characteristics depend on the temperature change of the shape memory alloy material, the base member and the movable member that are in contact with the shape memory alloy material preferably have a high thermal conductivity and a shape derived from heat release. As a material having excellent heat dissipation properties of the memory alloy material, aluminum is exemplified as the optimum material.

On the other hand, since the base member or the movable member is in contact with the shape memory alloy material, it is necessary to be insulated from the shape memory alloy material, and the conventional technique is to die-cast (cast) the base member or the movable member by aluminum. The surface is subjected to surface insulation treatment such as an alumite treatment (for example, refer to paragraphs 0036 and 0037 of Patent Document 2).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] JP-A-2005-226456

[Patent Document 2] JP-A-2014-088811

However, the conventional technique as described above has a problem that not only the aluminum material constituting the base member or the movable member itself is very expensive, but also the surface insulation treatment such as the alumite treatment requires a large cost, so that production may be caused. The cost is too high.

Further, the base member or the movable member made of the aluminum die-casting method has a problem that the dimensional accuracy is low and it is difficult to form into a complicated shape, so that the degree of freedom in design is low.

Further, since the surface insulating treatment such as the alumite treatment is performed, it takes a certain amount of time in the processing steps, so there is a problem that it is impossible to cope with mass production.

Here, the present invention has been developed in view of the problems of the above-described conventional techniques, and an object thereof is to provide a driving device which not only ensures high heat dissipation but also uses a shape memory alloy member which is inexpensive and can be mass-produced.

The drive device of the invention described in claim 1 for solving the problems of the above-described conventional techniques and achieving the desired object includes a wire-shaped or strip-shaped shape memory alloy member, which is caused by energization. The generated heat is contracted; the base member is held in a state where the both ends of the shape memory alloy member are fixed; and the movable member is capable of moving the base member, and the movable member is disposed to be The shape memory alloy member is in a contact state, and the movable member is brought forward in conjunction with the contraction caused by the energization of the shape memory alloy member. The driving device for moving the base member is characterized in that the base member and/or the movable member are molded by an insulating resin containing ceramic powder or granules.

According to the technical feature of the invention of claim 2, in the structure of claim 1, the technical feature is added such that the base member and the movable member are disposed to face each other, and the base member includes an action The base portion has one or a plurality of operation recesses on the opposite surface side, and the movable member includes an operation convex portion for inserting into the operation recess portion on the opposite surface side, and arranging the shape memory alloy member in the foregoing a contraction between the base member and the movable member and transverse to the operation base portion by the heat release when the shape memory alloy member that is deflected in the operation concave portion is energized, and the shape memory The operation convex portion that is in contact with the alloy member moves the movable member in a direction separating from the base member.

The technical feature of the invention described in claim 3 is characterized in that the structure of the claim 1 or the request 2 is characterized in that the base member and/or the movable member are integrally formed with a reinforcing portion for increasing the area moment of inertia thereof. .

The technical feature of the invention described in claim 4 is that the structure of the claim 3 is characterized in that the reinforcing portion is disposed at a rib portion on a side portion of the operation base portion.

The driving device disclosed in the present invention is as described above, and the device is provided a linear or strip-shaped shape memory alloy member that shrinks due to heat generation generated during energization; a base member that is held in a state where both ends of the shape memory alloy member are fixed; and a movable member The base member is movable, and the movable member is disposed in contact with the shape memory alloy member to be in contact with the contraction caused by energization of the shape memory alloy member, and the movable member is placed on the base. In the driving device for moving the seat member, the base member and/or the movable member are molded by an insulating resin containing ceramic powder or granules, thereby being applicable not only to high heat dissipation but also to surface insulation treatment. In mass production.

Further, in the present invention, the base member and the movable member are disposed to face each other, and the base member includes an operation base portion having one or a plurality of operation recesses on the opposite surface side thereof. The movable member includes an operation convex portion that is inserted into the operation concave portion on a side of the opposing surface, and the shape memory alloy member is disposed between the base member and the movable member and is transverse to the operation base portion. Shrinkage caused by heat release when the shape memory alloy member that is deflected in the operation concave portion is pressed, and the operation convex portion that is in contact with the shape memory alloy member is pressed to move the movable member toward the base The direction in which the members are separated is moved, whereby the tension generated by the contraction of the shape memory alloy member during heat release can be appropriately transmitted to the movable member, and since the shape memory alloy member is interposed between the movable member and the base member, The heat is released from the shape memory alloy member via the movable member and the base member.

Further, in the present invention, the base member and/or the movable member are integrally formed with a reinforcing portion for increasing the area moment of inertia, whereby the ceramic resin has high formability, so that the reinforcing portion can be easily formed and can be achieved. Strength reinforcement.

Furthermore, in the present invention, the reinforcing portion is disposed on the rib portion of the side portion of the operation base portion, whereby the strength of the base member can be enhanced, and the action convex portion of the movable member can be guided by the rib portion. It is possible to suppress the deviation of the acceleration by stably operating in the vertical direction.

A‧‧‧ Mounting substrate

B‧‧‧ frame

1‧‧‧ drive

2‧‧‧Shape memory alloy components

21‧‧‧Shape memory alloy wire

22‧‧‧covered components

3‧‧‧Base member

31‧‧‧Action recess

32‧‧‧Action base

33‧‧‧ terminal fixing section

34‧‧‧ ribs

35‧‧‧Support convex

36‧‧‧Rumping groove

4‧‧‧ movable components

41‧‧‧Action convex

42‧‧‧Transportation Department

43‧‧‧Flange

5‧‧‧Terminal metal parts

6‧‧‧ bracket

61‧‧‧plug-in window

Fig. 1 (a) and (b) are perspective views showing an example of a driving device disclosed in the present invention.

Fig. 2 is an exploded perspective view of Fig. 1.

Fig. 3(a) is a plan view showing a base member in Fig. 2, a longitudinal sectional view in Fig. 3(b), and a cross-sectional view taken along line aa in Fig. 3(c) and Fig. 3(b), Fig. 3(d) is a cross-sectional view taken along line bb of Fig. 3(b).

Fig. 4(a) is a side view showing the movable member in Fig. 2, Fig. 4(b) is a cross-sectional view taken along line cc of Fig. 4(a), and Fig. 4(c) is a fourth view (Fig. 4) A) A cross-sectional view of the dd line.

Fig. 5 is a longitudinal sectional view of Fig. 1, and Fig. 5(a) shows a state in which power is not supplied, and Fig. 5(b) shows a state in which power is applied.

Next, an embodiment of the driving device disclosed in the present invention will be described based on the embodiments shown in Figs. 1 to 5 . Further, in the present embodiment, a drive device for generating a vibration actuator will be described as an example. In the figure, the component symbol 1 is a drive device, the component symbol A is a mounting substrate, and the component symbol B is an electronic device. The frame.

The drive device 1 includes a shape memory alloy member 2 that contracts due to heat generation generated when energization is performed, and the base member 3 is held in a state in which both ends of the shape memory alloy member 2 are fixed; And the movable member 4, the base member 3 can be moved, and the movable member 4 can be placed in contact with the shape memory alloy member 2 so as to be interlocked with the contraction caused by the energization of the shape memory alloy member 2. The movable member 4 moves the base member 3 in the vertical direction.

Further, the drive device 1 includes terminal metal members 5 and 5 that are fitted to the end portions of the base member 3 and that fix the end portions of the shape memory alloy member 2 to the base member 3 via the terminal. The metal members 5, 5 energize the shape memory alloy member 2. Further, the component symbol 6 in the drawing is a bracket for holding the movable member 4 in the base member 3.

The shape memory alloy member 2 includes a shape memory alloy wire 21 composed of a shape memory effect alloy such as a nickel-titanium alloy, that is, a shape memory alloy, and a belt-shaped covering member 22 for covering a shape. The outer side of the memory alloy wire 21 is contracted by the heat release when the shape memory alloy wire 21 is energized even if it is deformed below a predetermined temperature.

As shown in FIG. 3, the base member 3 is integrally molded by injection molding using an insulating resin (hereinafter referred to as ceramic resin) containing ceramic powder or granules, and includes an operation base 32 on the surface portion. A plurality of operation recesses 31, 31, ... are provided; terminal fixing portions 33, 33 are disposed at both ends of the operation base portion 32; and rib portions 34, 34 are formed in a rising shape on both side portions of the operation base portion 32.

The ceramic resin is obtained by mixing a thermoplastic resin such as PPS (polysulfurized benzene) or a ceramic powder or the like with a predetermined ratio, and not only ensuring sufficient formability of the thermoplastic resin at the time of injection molding. The molded article can also be composed of insulation and high thermal conductivity.

Further, the composition of the ceramic resin is not limited to the thermoplastic resin and the ceramic powder or granule, and fibers such as glass fibers or other additives may be added as needed.

Further, the composition of the ceramic resin generally has the following properties: when the ratio of the thermoplastic resin is increased to improve the insulation (volume specific resistance), the thermal conductivity is lowered, and when the proportion of the ceramic powder or granule is increased When the thermal conductivity is increased, the insulating property (volume specific resistance) is lowered, and in order to achieve both the insulating properties and the thermal conductivity in the opposite relationship, it is important to balance the characteristics of the two and the composition of the respective components. Here, in the practice of the present invention, the ceramic resin is composed of a volume specific resistance of 10 ³ Ω. Above cm, and the thermal conductivity is preferably 1.5 W/mk or more.

The operation base portion 32 has a plurality of support convex portions 35 and 35 having a mountain-shaped cross section continuous in the longitudinal direction and formed in a wave shape in the short side direction, and the wavy valley portion is configured to constitute each operation concave portion. 31, 31, and the shape memory alloy member 2 is disposed between the two terminal fixing portions 33 and 33 and crosses the operation base portion 32 in the longitudinal direction, and both ends thereof are respectively supported by the terminal metal members 5 and 5. It is fixed to the terminal fixing portions 33 and 33.

The ribs 34 and 34 are formed in a wall shape integrally formed with the side surface of the operation base 32, and are used to close the side opening sides of the operation recesses 31, 31, ....

Further, by providing the ribs 34 and 34 in the operation concave portion (the aa line cross section in the drawing) of the base member, a U-shaped cross section is formed, and the top portion of the support convex portion 35 (the bb line cross section in the drawing) The cross-sectional shape is a rectangular shape, and the area moment of inertia is increased as compared with the case where the ribs 34 and 34 are not provided, and the integrally formed ribs 34 and 34 are used as the reinforcing portions to reinforce the strength.

The terminal fixing portions 33 and 33 are formed in a flat plate shape, and the end portion 21a of the shape memory alloy wire 21 is folded back from the surface side of the terminal fixing portion 33 to the back side by the end surface, and the terminal metal members 5 and 5 are embedded therein. The end portion 21a of the shape memory alloy wire 21 is fixed to the outside.

The terminal metal members 5 and 5 are formed by crimping a conductive metal material to form a rectangular can lid having one end closed, and the terminal metal members 5 and 5 are fitted to the terminal fixing portions 33 and 33. Not only the end portions of the shape memory alloy member 2 but also the terminal fixing members 33 and 33 are fixed, and the terminal metal members 5 and 5 are also connected.

Further, the back surface of the terminal fixing portions 33 and 33 is formed with a caulking groove 36 that faces the longitudinal direction of the base member 3 The caulking is performed by aligning the back side of the terminal metal members 5 and 5 with the position of the caulking groove 36, and not only the end portions of the shape memory alloy member 2 are reliably fixed to the terminal fixing portions 33 and 33, It is also ensured that the terminal metal members 5, 5 and the shape memory alloy member 2 are in a stable connection state.

On the other hand, as shown in FIG. 4, the movable member 4 is integrally molded by injection molding using an insulating resin (ceramic resin) containing ceramic powder or granules in the same manner as the base member 3.

The movable member 4 is provided on the opposite surface side with a plurality of mountain-shaped operation convex portions 41, 41, ... for inserting into the respective operation concave portions 31, 31, ... of the base member 3, thereby The base member 3 is superposed, and the respective operation convex portions 41, 41, ... are fitted into the operation concave portions 31, 31, ... such that the shape memory alloy disposed between the movable member 4 and the opposing face portion of the base member 3 The member 2 is deformed into a wave shape in accordance with the shape of the fitting surface of the operation convex portions 41, 41, .

Further, the movable member 4 guides the side surfaces of the operation convex portions 41 and 41 to the inner side surface of the rib portion 34 to stably operate in the vertical direction and suppress variations in acceleration.

The movable member 4 includes a transmitting portion 42 having a flat contact surface at the upper end, and the transmitting portion 42 is formed to be vertically movable in and out through an insertion window 61 that is open on the upper surface of the bracket 6.

Further, the outer peripheral body of the movable member 4 is formed with a flange portion 43 which is stopped by the outer edge of the insertion window 61 of the bracket 6, and the flange is flanged by the spring material 7, 7. The lower portion of the portion 43 is pushed upward.

Further, the movable member 4 is provided with the flange portion 43 as compared with In the case where the flange portion 43 is not provided, the area moment of inertia is increased, and the integrally formed flange portion 43 is used as the reinforcing portion to reinforce the strength.

As shown in FIG. 5( a ), the drive device 1 configured as described above is provided in a state in which the contact surface is pressed against the frame B between the mounting substrate A and the electronic device housing B, that is, It is set to a state in which the movable member 4 is pushed down to the base member 3 against the spring force of the spring materials 7, 7.

Then, when the power is not supplied, the movable member 4 is superposed on the base member 3, and the respective operation convex portions 41, 41, ... are inserted into the operation concave portions 31, 31, ... as described above, so that the motion convex portion The tops of the portions 41, 41, ... are in contact with the respective shape memory alloy members 2, and each of the shape memory alloy members 2 is formed in a state of being deformed into a wave shape (a shape when not energized).

When the driving device 1 is energized, that is, when a voltage is generated between the terminal metal members 5 and 5 to cause current to flow to the shape memory alloy member 2, the shape memory alloy member 2 has a shape memory effect, that is, because The heat generation due to energization and contraction will be as shown in Fig. 5(b), and the position between the opposing faces of the portion of the shape memory alloy member 2 in contact with the top of the operation projections 41, 41... will be directed toward The movable member 4 side is deformed, and the movable member 4 is pushed up by the operation convex portions 41, 41, ... by the operation convex portions 41, 41, ... and moved in the direction separated from the base member 3 to move the electrons. The machine frame B is lifted.

Then, when the voltage applied between the terminal metal members 5 and 5 is removed, the movable member 4 is reset to the original position shown in Fig. 5(a) by the load applied by the electronic device casing B or the like. That is, reset to be movable The member 4 is superposed on the position of the base member 3, and the respective operation convex portions 41, 41... are inserted into the operation concave portions 31, 31, ... as described above, so that the shape memory alloy member 2 is moved by the convex portion 41, 41... Press to return to a wave shape (shape when not energized).

At this time, since the operating characteristics of the driving device 1 depend on the temperature of the shape memory alloy member 2, in order to restore the shape memory alloy member 2 to the shape when the battery is not energized, the temperature of the shape memory alloy member 2 must be lowered to a predetermined temperature or lower. .

In the drive device 1 disclosed in the present invention, the base member 3 and the movable member 4 which are in contact with the shape memory alloy member 2 are formed by a ceramic resin having high thermal conductivity, whereby the base can be efficiently passed through the base The member 3 and the movable member 4 radiate heat energy of the shape memory alloy member 2, so that stable operation characteristics can be obtained.

Further, in the drive device 1 disclosed in the present invention, since the base member 3 and the movable member 4 are formed by injection molding using a ceramic resin, it is possible to obtain not only high thermal conductivity but also complicated surface insulation treatment. Mass production.

In addition, since it can be formed with high precision compared with the case of casting by a metal material such as aluminum of the prior art, it is possible to cope with a complicated shape and improve the degree of freedom in design.

Further, by integrally forming the reinforcing member for increasing the area moment of inertia of the base member 3 and the movable member 4, it is possible to secure the strength of the metal material superior to the conventional technique, and since the reinforcing portion is emitted by the reinforcing portion It can be formed into a single shape by molding, so it can also be made into a complicated shape. shape.

Further, in the above-described embodiment, an example in which the base member 3 and the movable member 4 are molded using a ceramic resin has been described. However, it is also possible to form either of them by using only a ceramic resin, and the other is to use other materials. For example, die-cast aluminum or a general thermoplastic insulating resin containing no ceramic powder or granules is formed.

Further, the drive device 1 disclosed in the present invention is not limited to the actuator for generating vibration, and may be used for other purposes.

2‧‧‧Shape memory alloy components

3‧‧‧Base member

4‧‧‧ movable components

5‧‧‧Terminal metal parts

6‧‧‧ bracket

7‧‧‧Spring material

21‧‧‧Shape memory alloy wire

21a‧‧‧End

22‧‧‧covered components

34‧‧‧ ribs

42‧‧‧Transportation Department

61‧‧‧plug-in window

Claims (4)

A driving device comprising: a wire-shaped or strip-shaped shape memory alloy member that shrinks due to heat generation generated during energization; and a base member that is fixed in a state in which both ends of the shape memory alloy member are fixed And a movable member capable of moving the base member and arranging the movable member in contact with the shape memory alloy member to cause a contraction with a force generated by energization of the shape memory alloy member The movable member moves the base member, and the base member and/or the movable member are molded by an insulating resin containing ceramic powder or granules. The driving device according to claim 1, wherein the base member and the movable member are disposed to face each other, and the base member includes an operation base portion having a facing surface side thereof One or a plurality of operation recesses, wherein the movable member includes an operation convex portion that is inserted into the operation concave portion on a side of the opposing surface, and the shape memory alloy member is disposed between the base member and the movable member The operation convex portion that is in contact with the shape memory alloy member is pressed against the contraction of the shape memory alloy member that is in a state of being flexed in the operation recessed portion by the heat dissipation during the energization of the shape memory alloy member The movable member is moved in a direction separating from the base member. The driving device according to claim 1 or 2, wherein the base member and/or the movable member are integrally formed with a reinforcing portion for increasing the area moment of inertia. The driving device according to claim 3, wherein the reinforcing portion is disposed at a rib portion of a side portion of the operation base portion.