Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1985-05-03
1988-09-20
Braun, Leslie A.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74785, 74409, F16H 128
Patent
active
047716541
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a gear system and is particularly concerned with a gear system such as a planetary gear system wherein a plurality of gears are in meshing engagement with the central gear, transmission power being equally divided into said plurality of gears.
As an example of such gear system, there has hitherto been known a speed reducing mechanism for use in connection with a geared motor as shown in FIG. 1. In such a speed reducing mechanism, an input shaft 2 supported in a motor casing 1 is operatively associated with an external gear 3 which serves as a sun gear. Three planetary gears 5 are disposed between the external gear 3 and a stationary gear 4 for meshing purposes. Associated operatively with an output shaft 7 is a carrier 6 adapted to rotatably support the planetary gears 5. Now, in such a planetary gear mechanism, assuming that central distances L1 between the respective adjacent planetary gears are exactly coincident with each other and central distances L2 between the external gear 3 and the adjacent planetary gears are also exactly coincident with each other as shown in FIG. 2, the planetary gears are disposed in equal spaced relationship with each other. Therefore, load is evenly applied to the respective planetary gears 5 provided that the respective gears 3, 4 and 5 have no error. Thus, these gears 3, 4 and 5 may be operated as positively as expected. In practice, however, coincidence of each of the central distances L1 and L2 is hardly accomplished. Furthermore, bearing portions of the respective planetary gears 5 and the gears 3, 4 and 5 are naturally never free of errors. As a consequence, even application of the load is hardly effected and power is not equally divided. In addition, there is a disadvantage that noises occur due to vibrations of the whole speed reducing mechanism.
SUMMARY OF THE INVENTION
This invention has been made in order to overcome the foregoing disadvantages and has for its object to provide a gear system which permits even application of load to a plurality of gears meshing with the central gear so as to ensure equal division of power and which prevents occurrence of noises due to vibrations thereof.
Another object of the invention is to provide a gear system which is compact and is readily incorporated into a wide variety of machines.
A further object of the invention is to provide a gear system which is simple in construction and is readily and economically manufactured.
Yet another object of the invention is to provide a gear system which prevents disorder of gears upon generation of excessive thrust.
According to this invention, the planetary gear 5 is mounted on the main shaft 8 (hereinafter, referred to as a conical shaft) in such a manner to move axially thereon, said planetary gear 5 being in meshing engagement with the gear 3. Thrust in the direction of the small diameter end of the conical shaft 8 is generated at the gear 5 depending upon variations in load applied to the gear 5. A receiving means is provided to receive the gear 5 movable in the direction of the small diameter end of the conical shaft 8. The receiving means may also serve as a thrust measuring means to measure the amount of the thrust generated at the gear 5.
Also, according to the invention, a plurality of gears 5 may be provided. In this case, the receiving means also serves as a thrust counterbalance means to provide equal application of load responsive to the thrust generated at the respective gears 5. Under the influence of this thrust counterbalance means, as the axial position of the gears on the shafts 8 is changed, a clearance S formed between the surface of each shaft 8 and the inner peripheral surface of bearing 17 of each gear 5 is changed accordingly. Consequently, the center axis of each conical shaft 8 is deviated from that of each gear 5. In this state, load is reduced in the gear with now high load applied thereto whereas load is increased in the gear 5 with now low load applied thereto. Hence, equal load is applied to the re
REFERENCES:
patent: 2231784 (1941-02-01), Von Thungen
patent: 2496857 (1950-02-01), Cronstedt et al.
patent: 2547877 (1951-04-01), Lucia
patent: 2698526 (1955-01-01), Beier
patent: 2749778 (1956-06-01), Kuhn
patent: 3839922 (1974-10-01), Hiersig et al.
patent: 3943780 (1976-03-01), Klaue
patent: 4524643 (1985-06-01), Ziegler et al.
Go Mutsukazu
Shinjo Kinichi
Braun Leslie A.
Novais David
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