JPH0443368U

JPH0443368U -

Info

Publication number: JPH0443368U
Application number: JP8534990U
Authority: JP
Priority date: 1990-08-10
Filing date: 1990-08-10
Publication date: 1992-04-13

Description

[Brief explanation of the drawing]

第１図、第２図は、本考案のモータ駆動式リニ
アアクチユエータの直進停止構造の半縦断側面図
であり、第１図は直進停止していない状態を示し
、第２図は直進停止した状態を示す。第３図は、
他の実施例であり、直進停止構造の一部分を縦断
面にした側面図。第４図は、第３図のＡ矢視図。
第５図は、従来のモータ駆動式リニアアクチユエ
ータの直進停止構造の半縦断側面図。第６図は、
第５図のＡ矢視図である。１……ロータ、２……ハウジング、３……ベー
ス、４……軸受、５……固定子コイル、６……内
筒、７……めねじブツシユ、８……シヤフト、９
……おねじ、１０……異径軸部、１１……異径穴
、１２……異径穴ブツシユ、１３……内筒の端面
、１４……止めピンＡ、１５……止めピンＢ、１
６……めねじ、１７……調整ボルト、１８……お
ねじ、１９……めねじ、２０……シヤフトの段差
部。 Figures 1 and 2 are semi-longitudinal side views of the straight-line stop structure of the motor-driven linear actuator of the present invention, with Figure 1 showing the state in which it is not stopped in a straight line, and Figure 2 showing it in a straight-line stopped state. Indicates the state in which Figure 3 shows
FIG. 7 is a side view showing a vertical section of a portion of the straight-travel stop structure, which is another embodiment. FIG. 4 is a view taken along arrow A in FIG. 3.
FIG. 5 is a semi-longitudinal side view of a conventional motor-driven linear actuator straight stop structure. Figure 6 shows
5 is a view taken along arrow A in FIG. 5. FIG. 1... Rotor, 2... Housing, 3... Base, 4... Bearing, 5... Stator coil, 6... Inner cylinder, 7... Female threaded bush, 8... Shaft, 9
... Male thread, 10 ... Different diameter shaft part, 11 ... Different diameter hole, 12 ... Different diameter hole bushing, 13 ... End face of inner cylinder, 14 ... Stop pin A, 15 ... Stop pin B, 1
6... Female thread, 17... Adjustment bolt, 18... Male thread, 19... Female thread, 20... Step portion of shaft.

Claims

[Claims for Utility Model Registration] (1) A rotor 1 having a female threaded bush 7 on its inner peripheral surface is supported by bearings 4 fixed to a motor housing 2 and a base 3, while a shaft 8 The male thread 9 is screwed into the female thread bush 7, and the different diameter shaft portion 10 formed in the lower part of the shaft 8 is slidably inserted into the different diameter hole bush 12 press-fitted into the motor base 3. , in a linear actuator in which the shaft moves in a straight line due to the rotation of the rotor, the female thread of the female threaded bush 7 and the male thread 9 of the shaft 8 have a thread efficiency of over 50% (thread lead angle > thread friction). Square) A self-loosening thread is provided, and a penetrating female thread 16 is provided in the motor housing 2 coaxially with the shaft 8. An adjustment bolt 17 is fitted into this female thread 16, and when the shaft 8 moves straight by a specified amount, the above-mentioned A linear stop structure for a motor-driven linear actuator, characterized in that the adjustment bolt and one end of the shaft are configured to collide. (2) The rotor 1, which has a female threaded bush 7 on its inner peripheral surface, is supported by bearings 4, 4 fixed to the motor housing 2 and base 3, while the male thread 9 of the shaft 8 is supported by the female threaded bush 7. At the same time as being screwed onto the bushing 7, the different diameter shaft portion 10 formed in the lower part of the shaft 8 is slidably inserted into the different diameter hole bushing 12 press-fitted and fixed to the motor base 3, and the shaft moves straight due to the rotation of the rotor. In the linear actuator that is designed to move, the female thread of the female threaded bush 7 and the male thread 9 of the shaft 8 are made into self-loosening threads with a thread efficiency exceeding 50% (thread lead angle > thread friction angle). A stepped portion 20 is provided below the male thread 9, and a female thread 19 is provided on the base 3 coaxially with the shaft 8.
A different diameter bush 12 whose position can be adjusted in the vertical direction is screwed together, and the inner surface of the different diameter bush 12 comes into contact with the stepped portion 20 of the shaft at the point where the shaft 8 moves straight a prescribed amount. A linear stop structure for a motor-driven linear actuator, which is characterized by: