CN201418021Y

CN201418021Y - Micro stepping motor

Info

Publication number: CN201418021Y
Application number: CN2009200641429U
Authority: CN
Inventors: 彭希南; 卢文波; 荀庆来; 邱俊; 谢稳; 张小军; 苏明; 肖调生
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-04-21
Filing date: 2009-04-21
Publication date: 2010-03-03
Anticipated expiration: 2019-04-21

Abstract

The utility model discloses a micro stepping motor, comprising an upper cover (1), a lower cover (2), a rotor (7), a reduction gear train (9), (10), (11) and (12), a transmission gear, a stator iron core body (15), a two-phase coil (14) on the iron core body, an indicator needle pivot hole step (17), an indicator needle driving shaft sleeve (13) fixed at the axle center of a driven wheel (12) anda light through hole (16) on the lower cover (2). The shaft (19) of the indicator needle penetrates through the indicator needle pivot hole step (17) to be directly inserted into an indicator needle driving shaft sleeve (13) and tightly matched with the inner wall thereof; the driving shaft sleeve (13) drives an indicator needle (18) to rotate; and an LED (20) is mounted below the light through hole (16) to form a light path penetrating the hollow indicator needle driving shaft sleeve (13) and the indicator needle pivot hole step (17) from the bottom of the motor to directly reach to the indicator needle.

Description

Micro-step motor

Technical field

The utility model relates to a kind of micro-step motor, and its pointer drives and adopts hollow light transmission shaft structure, and the pointer that is mainly used in automobile instrument and other various pointer digital instruments drives.

Background technology

Stepping motor is a kind of electric impulse signal to be converted into the execution unit of angular displacement, and the output shaft by motor directly drives gauge pointer and rotates, and is one of basic device of realizing digital instrumentation.Yet common instrument adopts solid shafting as pointer driving shaft with stepping motor basically, and pointer is directly installed on the pointer driving shaft, is driven by the motor solid drive shafts and rotates.Such stepping motor pointer Drive Structure, the turned position of observing pointer by day is no problem, and at the night of dim light, the turned position of pointer often is difficult to observe, and usually needs to be aided with the backlight illumination.

But during the night observation pointer, because pointer driving shaft is lighttight solid shafting, there is obvious defects in this Drive Structure.At first must just can make pointer obtain enough visibilities at a plurality of highlighted LED light-emitting diodes of the positioned beneath of pointer or bulb backlight.On the other hand, LED or the backlight installation site on the PCB circuit board is also rather exquisite, and a plurality of light-emitting diodes need be installed in the position of close needle pivot on the pcb board, keep each light-emitting diode to equate with the vertical range of needle pivot.Secondly, also to arrange a plurality of light-emitting diodes to be evenly distributed in the dial plane vertical, need at interval between each diode to adjust different angles, to guarantee that pointer all can show in whole meter full scale by the light path experiment with needle pivot.On angle attractive in appearance, for fear of pointer on dial when mobile the part position bright excessively because of the light cover, shading because of surplus rayed in part scale place, then need add light splitting piece in addition and produce diffuse reflection, even to guarantee back lighting.As seen, the structure of solid pointer driving shaft has not only increased the application cost of pointer night vision illumination, and makes the night lighting system of pointer instrument become complicated because of increasing spectrophotometric device, has increased the hardware spending of product greatly.

The utility model content

In view of the above, to the utility model proposes a kind of pointer driving shaft be hollow and have logical optical cavity road, thereby make the pointer night vision illumination structure foolproof micro-step motor that becomes.

The new solution that the utility model proposes is as follows:

For overcoming the defective of the solid pointer driving shaft of stepping motor, the utility model has designed a micro-step motor with logical optical cavity road, comprise motor housing loam cake (1) and lower cover (2), on cover and be fixed with the hollow step of pointer axis hole (17), under cover have light hole (16)), double reduction gearing system comprises driving wheel armature spindle (8), driving wheel p-m rotor (7), I level driven pulley rotation axis (11), I level driven pulley (9) (10), II level driven pulley (12), be fixed on the hollow pointer driving shaft cover (13) of II level driven pulley (12) center, stator core (15), about two phase coils (14), motor pin (3) (4) (5) (6), axle of pointer (19) and pointer (18), wherein pointer driving shaft cover (13) is hollow printing opacity cavity, the centre that its hollow pointer driving shaft cover (13) is two perforate is hollow plastic cylinder, this cylinder is fixed on the center of II level driven pulley (12), gear (10) engaged transmission of II level driven pulley (12) and I level driven pulley, coaxial I level driven pulley (9) again with driving wheel p-m rotor (7) engaged transmission, therefore hollow pointer driving shaft cover (13) is directly driven by II level driven pulley (12) and rotates.

In order to guarantee that pointer (18) is directly inserted pointer driving shaft cover (13), the utility model is provided with a pointer axis hole step (17) on stepping motor loam cake (1), with lower cover (2) on have a light hole (16).Pointer axis hole step (17) is fixed on the loam cake (1), and the axle center of (17) and hollow pointer driving shaft cover (13) are centered close on same the straight line, and the aperture of pointer axis hole step (17) is identical with the internal diameter of hollow shaft sleeve (13).The axle of pointer (19) passes axis hole step (17) and inserts in the pointer driving shaft cover (13), and with (13) internal chamber wall tight fit, when II level driven pulley (12) rotated, (13) are rotation synchronously also, directly drives pointer (18).

Have a light hole (16) on the lower cover (2).The center of the center of the center of light hole (16) and pointer axis hole step (17) and pointer driving shaft cover (13) also point-blank, the light hole aperture is identical with the internal diameter of pointer driving shaft cover, thereby guarantees that light hole (16), pointer driving shaft cover (13) have formed a light path of directly being led to axle (19) with the pointer (18) of pointer by motor bottom jointly with pointer axis hole step (17).The axle of pointer (19) can be made hollow body, is made by transparent material, therefore, only needs to locate to be provided with one piece of highlighted surface at the light hole (16) of lower cover (2) and pastes LED light-emitting diode (20), can constitute the pointer night lighting system.After the energising, the light that light-emitting diode (20) sends just by light hole (16), pass the needle pivot (19) that pointer axis hole step (17) inserts hollow shaft sleeve (13) and illuminate whole cursor arrow (18), obtain good night vision effect.Compare with existing stepping motor, pointer of the present utility model drives design and has not only saved material for the pointer night vision illumination, has reduced application cost, and has simplified pointer night illumination structure Design, makes instrument more practical with stepping motor, is easy to promote.

Description of drawings

Fig. 1 is the utility model outline drawing;

Fig. 2 is the utility model internal structure explosive view;

Fig. 3 is the outline drawing of the utility model in conjunction with pointer.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

Outline drawing of the present utility model is Fig. 3, and the inner body structure is referring to Fig. 1 and Fig. 2.In Fig. 2, the utility model comprises motor housing loam cake (1) and lower cover (2), on cover and be fixed with the hollow step of pointer axis hole (17), cover down and having light hole (16)), double reduction gearing system comprises driving wheel armature spindle (8), driving wheel p-m rotor (7), I level driven pulley rotation axis (11), I level driven pulley (9) (10), II level driven pulley (12), be fixed on the hollow pointer driving shaft cover (13) of II level driven pulley (12) center, stator core (15), about two phase coils (14), motor pin (3) (4) (5) (6), axle of pointer (19) and pointer parts such as (18).

Described reduction gearing is a secondary travelling gear system.Driving wheel p-m rotor (7) is the motor of gear train, and directly the magnetic field that is produced by left and right two phase coils (14) promotes.Described stator core body (15) is designed to the triangle ring bodies structure of a closure, and left and right two phase coils (14) are separately fixed on the stator core body, utilizes the variation in magnetic field to produce torque.

Armature spindle (8) is non-magnetic stainless pin with I level driven pulley rotating shaft (11).Rotor (7) and I level driving gear set gear (9) engaged transmission, driving coaxial gear (10) when gear (9) rotates rotates, gear (10) and II level driving gear set gear (12) engaged transmission, form second level reducing transmission structure, thereby realize the interlock between I level transmission and the transmission of II level.Hollow pointer driving shaft cover (13) is coaxial and be connected as a single entity with II level driven pulley (12), is positioned at place, driven pulley (12) axle center, drives its synchronous rotation by II level driven pulley (12).

The utility model key is to have designed a hollow pointer driving shaft cover (13) to replace solid shafting and one and directly lead to the light conduction pathway of cursor arrow (18) from motor bottom, thereby simplifies pointer night illumination structure.Described pointer driving shaft cover (13) is the hollow plastic cylinder of a two ends perforate, and barrel is that light-proof material is made, and is driven synchronously by II level driven pulley (12) and rotates.Be provided with pointer axis hole step (17) on the loam cake of stepping motor (1), have light hole (16) on the lower cover (2)), three's position is on same the straight line, and clear aperature is identical with the internal diameter of hollow shaft.The axle of pointer (19) can be made hollow, also can make solidly with light transmissive material, but cursor arrow partly adopts light transmissive material.Pointer passes pointer axis hole step (17) back and inserts in the pointer driving shaft cover (13), and with (13) internal chamber wall tight fit, pointer driving shaft cover (13) drives cursor arrow (18) simultaneously when rotating.

Light hole (16) is positioned on the lower cover (2), is in collinear position with hollow pointer driving shaft cover (13), and the aperture of light hole is identical with the internal diameter of hollow pointer driving shaft cover (13).Because hollow shaft sleeve (13), light hole (16) and pointer axis hole step (17) have formed one jointly and have directly led to the light conduction cavity of needle pivot (19) and pointer (18) by motor bottom, and the night illumination structure of pointer obtains simplification.During installation, only need LED light-emitting diode (20) fixed placement of one piece of high brightness is located at stepping motor lower cover light hole (16), cursor arrow just can obtain good night vision effect.

In sum, the utility model micro-step motor has improved the rotation axis night vision illumination structure of common stepping motor, has proposed a kind of backlight design scheme of hollow pointer printing opacity driving shaft.This design makes the backlight of pointer and night illumination structure become very simple owing to removed light splitting piece, and lighting circuit is also more saved, and is particularly suitable for the application of middle and high end pointer-type digital instrument.

Claims

1, a kind of micro-step motor, comprise motor housing loam cake (1) and lower cover (2), on cover and be fixed with the hollow step of pointer axis hole (17), under cover have light hole (16)), double reduction gearing system comprises driving wheel armature spindle (8), driving wheel p-m rotor (7), I level driven pulley rotation axis (11), I level driven pulley (9) (10), II level driven pulley (12), be fixed on the hollow pointer driving shaft cover (13) of II level driven pulley (12) center, stator core (15), about two phase coils (14), motor pin (3) (4) (5) (6), axle of pointer (19) and pointer (18) is characterized in that pointer driving shaft cover (13) is hollow printing opacity cavity.

2, micro-step motor according to claim 1, it is characterized in that a centre that is fixed on the two open ends of II level drive (12) center is that hollow plastic cylinder is as its pointer driving shaft cover (13), II level driving gear set driven pulley (12) and I level driven gear (10) engaged transmission, coaxial I level driven pulley (9) is interconnected with driving wheel p-m rotor (7) engagement again, its pointer driving shaft cover (13) and II level driven pulley (12) coaxial rotation.

3, micro-step motor according to claim 1, the loam cake (1) that it is characterized in that stepping motor is gone up fixing bossed pointer axis hole step (17), the aperture of pointer axis hole step (17) is identical with the internal diameter of pointer driving shaft cover (13), the axle of pointer (19) passes pointer axis hole step (17) and inserts in pointer driving shaft cover (13) inner chamber, and tight fit with it, directly drive pointer (18) by (13) and rotate synchronously.

4, micro-step motor according to claim 1 is characterized in that having on the motor lower cover (2) light hole (16), and the internal diameter of the internal diameter of its aperture and hollow shaft (13) and the pointer axis hole step (17) of loam cake (1) upper process is identical.

5, micro-step motor according to claim 1, it is characterized in that light hole passage (16), pointer driving shaft cover (13) and pointer axis hole step (17) point-blank, form a hollow printing opacity light path of directly leading to axle (19) with the pointer (18) of pointer by motor bottom jointly.