WO2006137617A1

WO2006137617A1 - Power delivery apparatus

Info

Publication number: WO2006137617A1
Application number: PCT/KR2005/002934
Authority: WO
Inventors: Jong-Heon Park
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-06-24
Filing date: 2005-09-05
Publication date: 2006-12-28
Anticipated expiration: 2007-12-24
Also published as: KR100534198B1

Abstract

A power transmission apparatus comprises a housing defining an accommodating part between a front plate and a rear plate; an input section including a rotation shaft which passes through the front plate and a rotator which is coupled to the rotation shaft and has a sun gear part; an inertia force producing section composed of unit driven parts each having a planetary gear which is meshed with the sun gear part, a driven shaft on which the planetary gear is secured and which passes through the front and rear plates of the housing, and a weight which is secured to the driven shaft and positioned in the accommodating part of the housing; and an output section including connection gears which are secured to the driven shafts and positioned on the rear plate and an intermediate shaft which has an intermediate gear meshed with the connection gear.

Description

Description POWER DELIVERY APPARATUS

Technical Field

[1] The present invention relates to a power transmission apparatus for accelerating the rotational velocity of a power source through combination of a sun gear and planetary gears, and more particularly, to a power transmission apparatus wherein torque and increased rotational velocity is maintained due to inertia force produced when weights provided to driven shafts on which planetary gears are secured rotate, so that energy loss in a power transmission procedure can be minimized in a generator, an internal combustion engine, etc. to which the power transmission apparatus can be applied. Background Art

[2] Planetary gear devices or power transmission apparatuses for changing output torque and/or velocity of a power source in machine tools, generators, automotive vehicles, etc. have been disclosed in the art.

[3] In Korean Patent No. 395402 (dated August 8, 2003) entitled "apparatus for increasing power of planetary gear", Korean Utility Model Registration No. 333593 (dated November 7, 2003) entitled "planetary gear device having carrier", Korean Utility Model Registration No. 334020 (dated November 12, 2003) entitled "acceleration device of planetary gear unit", and Korean Patent Laid-open Publication No. 2005-22902 (dated March 8, 2005) entitled "acceleration device using a plurality of planetary gear units", the present applicant, Jong Heon, PARK has disclosed intermediate devices for improving output torque of a power source, ensuring stable rotation, and accelerating initial rotational velocity. Disclosure of Invention Technical Problem

[4] The present invention has been created as a result of efforts made by the present applicant for several years in connection with the above-described power transmission apparatus, and an object of the present invention is to provide a power transmission apparatus wherein energy loss is minimized through a simplified power transmission structure, an initial rotational velocity inputted from a power source is output in a state in which it is accelerated through proper arrangement of a sun gear and planetary gears, and weights produce inertia force, especially, centripetal force to contribute to maintenance or increase of torque. Technical Solution

[5] In order to achieve the above object, according to the present invention, there is provided a power transmission apparatus comprising a housing defining an ac- commodating part between a front plate and a rear plate; an input section including a rotation shaft which passes through the front plate of the housing and a rotator which is coupled to the rotation shaft and has a sun gear part; an inertia force producing section composed of a plurality of unit driven parts each having a planetary gear which is meshed with the sun gear part of the rotator of the input section, a driven shaft on which the planetary gear is secured and which passes through the front and rear plates of the housing, and a weight which is secured to the driven shaft and positioned in the accommodating part of the housing, N planetary gears of the unit driven parts being arranged in such a way as to be spaced apart from one another by an angle of 360°/N; and an output section including connection gears which are secured to the driven shafts of the unit driven parts of the inertia force producing section and positioned on the rear plate and an intermediate shaft which has an intermediate gear meshed with the connection gears.

Advantageous Effects

[6] The power transmission apparatus according to the present invention provides advantages in that energy loss is minimized through a simplified power transmission structure, an initial rotational velocity inputted from a power source is output in a state in which it is accelerated through proper arrangement of a sun gear and planetary gears, and weights produce inertia force, especially, centripetal force to contribute to maintenance or increase of torque. Brief Description of the Drawings

[7] FIG. 1 is an exploded perspective view illustrating a power transmission apparatus in accordance with an embodiment of the present invention;

[8] FIG. 2 is a cross-sectional view illustrating the power transmission apparatus according to the present invention which is in an assembled state;

[9] FIG. 3a is an exploded perspective view illustrating a state in which helical gears are applied to an input section; and

[10] FIG. 3b is an exploded perspective view illustrating a state in which helical gears are applied to an output section.

[11] <Description of Reference Numerals for Main Components of Drawings>

[12] A: power transmission apparatus 10: housing

[13] 11: front plate 13 : rear plate

[14] 15: cylindrical body 20: input section

[15] 21: rotation shaft 23 : rotator

[16] 25: sun gear part 30: inertia force producing section

[17] 31: driven shaft 33: planetary gear

[18] 35: weight 40: output section [19] 41: intermediate shaft 43: intermediate gear

[20] 45: connection gear

Best Mode for Carrying Out the Invention

[21] Reference will now be made in greater detail to a preferred embodiment of the invention, an example of which is illustrated in the accompanying drawings. Wherever possible, the same reference numerals, especially having the same ten's figure and one's figure, will be used throughout the drawings and the description to refer to the same or like part unless specifically mentioned.

[22] As shown in FIGs. 1 and 2, a power transmission apparatus A in accordance with an embodiment of the present invention largely comprises a housing 10 having a cylindrical configuration, an input section 20 including a rotator 23 which is arranged on a front plate 11 of the housing 10, an inertia force producing section 30 composed of a plurality of unit driven parts 30A each of which has a planetary gear 33 meshed with a sun gear part 25 of the rotator 23 of the input section 20 and a weight 35, and an output section 40.

[23] The housing 10 is composed of a cylindrical body 15, and the front plate 11 and a rear plate 13 which close both open ends of the cylindrical body 15.

[24] In connection with the front and rear plates 11 and 13, the front and rear regions are determined in consideration of a power transmission course, so that the front indicates a direction which extends toward the input section 20, and the rear indicates a direction which extends toward the output section 40.

[25] The front and rear plates 11 and 13 are defined with openings 11a and 13a which contribute to the saving of material and which allows an inside situation in an accommodating part 1OA defined in the housing 10 to be observed.

[26] The cylindrical body 15, and the front and rear plates 11 and 13 are fastened to one another by screws S.

[27] The cylindrical body 15 may have various configurations so long as it defines the accommodating part 1OA for accommodating the weights 35 of the inertia force producing section 30.

[28] The center portions of the front and rear plates 11 and 13 are respectively defined with three holes (not numbered) for allowing passage of a rotation shaft 21 and driven shafts 31 with bearings B which function to reduce frictional resistance, fitted therein.

[29] The input section 20 arranged on the front plate 11 of the housing 10 has the rotation shaft 21 which is fitted through the bearing B. The rotator 23 having a sun gear part 25 is secured to the rotation shaft 21.

[30] Especially, the sun gear part 25 comprises an internal gear. The sun gear part 25 and the rotator 23 are separately formed and coupled to each other by locking screws (not shown) for ensuring easy manufacture.

[31] A gear or spline type connection part 27 is formed at the center portion of the rotator 23 to be connected with a power source such as an electric motor or an internal combustion engine. The connection part 27 may have various configurations.

[32] The inertia force producing section 30 which is connected to the input section 20 is composed of the plurality of unit driven parts 30A.

[33] Each unit driven part 30A has the driven shaft 31 which passes through the front and rear plates 11 and 13 of the housing 10 with the bearings B interposed between the driven shaft 31 and the front and rear plates 11 and 13. The planetary gear 33 which is to be meshed with the sun gear part 25 of the input section 20 is secured to the front end of the driven shaft 31 adjacent to the front plate 11.

[34] The weight 35 which is positioned in the accommodating section 1OA of the housing 10 is coupled to the driven shaft 31 by means of a key, etc. such that the weight 35 is prevented from being idly rotated.

[35] The illustrated weight 35 has a disc-shaped configuration. The weights 35 of the unit driven parts 30A are respectively arranged on different planes so that the rotation of the respective weights 35 is not obstructed due to contact or collision with other weights 35.

[36] Each driven shaft 31 passes through the gravity center of the weight 35. The weight

35 has a symmetrical configuration. When considering design convenience, it is preferred that the weight 35 have the disc-shaped configuration.

[37] When assuming that N unit driven parts 35A are employed, it is preferred that N planetary gears 33 which are meshed with the sun gear part 25 are arranged to be regularly spaced apart from one another by an angle of 360°/N.

[38] It is preferred that the number of the planetary gears 33, that is, the unit driven parts 35A, be 2 to 5 when considering design and manufacture convenience and the relationship between the planetary gears 33 and the output section 40.

[39] The gear ratio between the sun gear part 25 and the planetary gear 33 may be 10:1 to 3:1 and is appropriately determined in consideration of an output acceleration with respect to an input rotational velocity.

[40] The weight of the weight 35, that is, the size of the power transmission apparatus A according to the present invention is appropriately determined depending upon an intended use of the power transmission apparatus. For example, when supposing that two unit driven parts 35A as shown in the drawings are employed and the power transmission apparatus is used for a small generator, each weight 35 may have a weight of about 40 kg.

[41] It is preferred that the sun gear part 25 of the rotator 23 of the input section 20 and the planetary gears 33 of the inertia force producing section 30 comprise helical gears, since the helical gears have smoothly meshed teeth when compared to spur gears 3, whereby vibration and noise can be reduced. Also, because the helical gears have an increased contact line length when compared to the spur gears, it is possible to transmit large power.

[42] Referring to FIG. 3, it is illustrated that a sun gear part 125 of an input section 120 comprises an internal helical gear and planetary gears 133 of an inertia force producing section comprise helical gears.

[43] Further, it is preferred that the helical gears comprise double helical gears in which two helical gears having teeth extending in different directions are combined for the purpose of removing a thrust load which is produced in an axial direction differently from the spur gear.

[44] Specifically, the double helical gears may comprise those suggested by the present applicant in Korean Utility Model Registration No. 332350 (dated October 28, 2003) entitled "double helical gear".

[45] In the power transmission apparatus according to the present invention, the output section 40 comprises connection gears 45 which are secured to the driven shafts 31 of the unit driven parts 30A of the inertia force producing section 30 and positioned on the rear plate 13.

[46] The output section 40 further comprises an intermediate shaft 41 to which an intermediate gear 43 is secured. The intermediate gear 43 is meshed with the connection gears 45 to be rotated thereby. A final target device such as a generator is operated through the intermediate shaft 41. The connection gears 45 and the intermediate gear 43 may be directly connected as shown in the drawings, or indirectly connected via separate gears or belts.

[47] The connection gears 45 and the intermediate gear 43 may comprise helical gears or double helical gears. In FIG. 3b, it is illustrated that an intermediate gear 143 and connection gears 145 of an output section 140 comprise helical gears.

[48] A support part 47 (see FIG. 2) having bearings B is formed in the rear plate 13 through which the intermediate shaft 41 passes to be supported thereby, to reduce resistance.

[49] In the power transmission apparatus A constructed as mentioned above, rotation force of the power source which is inputted into the power source connection part 27 of the rotator 23 of the input section 20 is transmitted through the sun gear part 25 to the planetary gears 33 of the respective unit driven parts 30A of the inertia force producing section 30 and thereby accelerated.

[50] As the driven shafts 31 of the inertia force producing section 30 rotate, the weights

35 are rotated, and a rotational acceleration and inertia force, especially, centripetal force is generated due to the weight of the weights 35, as a result of which it is possible to maintain or increase torque.

[51] The rotational force of the connection gears 45 which are provided to the rear ends of the driven shafts 31 adjacent to the rear plate 13 is transmitted through the intermediate gears 43 to the intermediate shaft 41 which is supported by the support part 47, and then rotates the final target device such as a generator. Depending upon an intended use of the power transmission device A according to the present invention, transmission means for deceleration or acceleration of rotational velocity may be disposed after the intermediate shaft 41.

Claims

[1] A power transmission apparatus comprising: a housing defining an accommodating part between a front plate and a rear plate; an input section including a rotation shaft which passes through the front plate of the housing and a rotator which is coupled to the rotation shaft and has a sun gear part; an inertia force producing section composed of a plurality of unit driven parts each having a planetary gear which is meshed with the sun gear part of the rotator of the input section, a driven shaft on which the planetary gear is secured and which passes through the front and rear plates of the housing, and a weight which is secured to the driven shaft and positioned in the accommodating part of the housing, N planetary gears of the unit driven parts being arranged in such a way as to be spaced apart from one another by an angle of 360°/N; and an output section including connection gears which are secured to the driven shafts of the unit driven parts of the inertia force producing section and positioned on the rear plate and an intermediate shaft which has an intermediate gear meshed with the connection gears.

[2] The power transmission apparatus according to claim 1, wherein the sun gear part of the rotator of the input section comprises an internal gear.

[3] The power transmission apparatus according to claim 2, wherein the sun gear part of the rotator of the input section and the planetary gears of the inertia force producing section comprise helical gears.

[4] The power transmission apparatus according to claim 3, wherein each of the helical gear is a double helical gear.

[5] The power transmission apparatus according to any one of claims 1 to 4, wherein each weight of the inertia force producing section has a disc- shaped configuration, and the weights of the respective unit driven parts are arranged on different planes.

[6] The power transmission apparatus according to any one of claims 1 to 4, wherein the connection gears and the intermediate gear of the output section comprise helical gears.