A MAGNETIC APPARATUS FOR PREVENTING BACKLASH OF TRANSMISSION FOR A VEHICLE

Abstract: Backlash preventing magnetic apparatus for a transmission for a vehicle having an outer race (2) fixed to a body (1), an inner race (5) fixed to a driving shaft (3). A plurality of projections (4) are formed on a circumferential surface of said inner race (5) or outer race (2). A plurality of rotating bodies (7) are disposed between said outer race (2) and said inner race (5) so that said rotating bodies (7) can be combined with said projections (4). A permanent magnet (6) is mounted on said each rotating bodies (7). An annular plate (8) supporting said rotating body (7) and a backlash preventing roller (9) are disposed respectively between said rotating bodies (7), wherein said backlash preventing roller (9) enables said inner race (5) to rotate in a first direction and prevents rotation in a reverse direction.

Description: A MAGNETIC APPARATUS FOR PREVENTING BACKLASH OF TRANSMISSION FOR A VEHICLE FIELD OF THE INVENTION The present invention relates to a apparatus for preventing backlash of transmission for a vehicle, particularly a magetic apparatus for preventing backlash of transmission in which a driving shaft gear being not rotated can smoothly mesh with another gear mounted on a passive shaft and can be used for a super-high speed rotating apparatus due to little noise. BACKGROUND OF THE INVENTION To the present, a backlash-preventing bearing used for transmission of the vehicle, such as a roller clutch, over running clutch, can be rotated in only one direction, but not in the opposite direction and prevents backlask appropriately in a gear assembly of which the driving shaft gear is fixed to mesh with the passive shaft gear. However, in case when the passive shaft at a stand still meshes with the driving shaft gear, the probability that the driving gear will mesh with the passive gear to rotate and the probality that it will mesh with the passive gear not to rotate is approximately even. That is, in case when the passive gear meshes with the driving gear at a stand still, the teeth of the passive gear and the teeth of the driving gear does not always mesh exactly with each other. Sometimes each gear is met with free ends of the teeth so that the power cannot be transmitted from the driving gear to the passive gear. The above problem occurs because there is no relative clearance for moving between the driving gear and the passive gear. Whether the teeth of gears exactly meshes or not depends on the conditions of the mating of the teeth. Therefore, in the backlash-preventing apparatus of the prior art constructed as above, it is difficult for the teeth of gears to exactly mesh with each other in the condition when the passive gear stops, and in case of the high speed rotation of the driving gear, and the severe friction between the backlash-preventing gears and driving gear generates serious noise, accordingly it cannot be used for a super high speed rotating apparatus. SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic apparatus for preventing backlash of a transmission, which prevents surely the backlash of the transmission and which can be adapted to various power transmission apparatus, i.e, transmission motorcycles, automobiles, ships, etc. Anoter object of the current invention is to provide a backlash preventing magnetic apparatus for a transmission having a gear assembly mounted on the driving shaft and a passive shaft which can effectively meshes under any conditions, and can be used for super high speed rotating assembly due to little noise. With the above object in view, the backlash preventing magnetic apparatus in accordance with the present invention comprises a plurality of projections formed on a circumferential surface of the inner or outer races. A plurality of rotating bodies are disposed between said outer race and said inner race so that said rotating bodies can be combined with said projections. A permanent magnet is mounted on said rotating bodies and a backlash-preventing roller is disposed respectively between said rotating bodies. Thus, when said driving shaft rotates clockwise, said rotating bodies and said backlash-preventing roller disposed between the outer race and the inner race rotates to the same direction by means of said projections. But when said driving shaft rotates to counter clockwise by means of a negative load, said backlash-preventing roller is pushed to a narrow of width between the outer race and the inner race. Therefore, said backlash-preventing roller functions as a key between the outer race and the inner race. Thus, said inner race cannot rotates backward so that the backlash of the transmission can be finally prevented. Further scope of appliability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those who are skilled in the art from this detailed description. THE BRIEF DESCRIPTION OF DRAWINGS The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein : Figure 1(a) is a cross sectional view of the preferred embodiment of the present invention mounted between an outer race and an inner race of the transmission ; Figure Kb) is a cross sectional view of the preferred embodiment of the present invention after a little reverse rotation of the transmission ; Figure 2(a) is a view similar to Fig. 1(a) of an alternate embodiment of the present invention ; Eigure 2(b) is a view of Fig 2(a) after a little reverse rotation of the transmission. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENS Fig.1(a) shows a backlash preventing magnetic apparatus in accordance with the preferred embodiment of the present invention mounted between the outer race and the inner race, there is shown a body 1 of a transmission on which a outer race 2 is mounted and a driving shaft 3 to which an inner race 5 having a plurality of projections 4 fixed. In this preferred embodiment, said projections 4 have a triangle cross section and are placed along the circumferential suface of the inner race 5. A permanent magnet 6 is respectively mounted on a plurality of rotating bodies 7 having a L cross section between the outer race 2 and inner race 5. The rotating bodies 7 are disposed to the same number of said projections 4. A annular plate 8 supporting said rotating body 7 and a backlash preventing roller 9 are disposed between rotating bodyies 7. Thus, if the driving shaft 3 rotates clockwise indicated as arrow, all components displaced between the driving shaft 3 and the body 1 of the trans- mission smoothly rotate in the clockwise direction. That is, as the driving shaft 3 rotates in the clockwise direction, the inner race 5 fixed to the driving shaft 3 rotates to the same direction, and as the front surface 7a of the rotating body 7 having a L cross section is contacted with the projection 4 formed the circumferential surface of the inner race 5, said rotating body 7 rotates with the inner race 5. Also, the annular plate 8 supporting the rotating body 7 and the backlash-preventing roller 9 rotate by means of the rotating body 7, therefore all components between the driving shaft 3 and the outer race 2 rotate to the same direction as the driving shaft 3 does. Referring to Fig. Kb), there is a reverse way comparing to Fig. 1(a). Fig. Kb) shows the stop state of the driving shaft 3 after a little backlash of the driving shaft 3. At the stop state of the driving shaft 3, when a first gear (not shown) mounted on the driving shaft 3 meshes with a second gear (not shown) mounted on the passive shaft, the second gear on the non rotating passive shaft can easily mesh with the first gear on the driving shaft 3. The detailed description of the above state is that the first gear mounted on the driving shaft is released from the second gear on the passive shaft by reason of speed change, and after the operation of the speed change is completed, the first gear again meshes with the second gear. The moment that free end of the teeth of the first gear meet with that of the second gear, as shown in Eig. Kb), the driving shaft 3 turns to the reverse direction about degree and gives some gap to the first gear to allow backward rotation of the first gear. The backward rotation of the first gear can allow the first gear on the driving shaft 3 to exactly mesh with the second gear on the passive shaft. The backward movement of the first gear comes from the reaction between the teeth of gears. Therefore, even in the non-rotating state of the second gear, the first gear on the driving gear connected to the transmission gear box can easily mesh with the second gear on the passive shaft. In addition, when the driving shaft 3 is backlashed by the load of inverse direction, for example when the annular plate 8 is backlashed, i.e. rotates counter-clockwise, by the load of inverse direction, at the stop sate of the annular plate 8 of the rotating body 7 by means of magnetic force of the permanent magnet 6 fixed to the annular plate 8, the inner race 5 is backlashed to about degree as shown in Fig. 1 (b), at the same time, the backlash preventing roller 9 is pushed to a narrow of width between the inner race 5 and the outer race 2. Therefore, said backlash preventing roller 9 functions as a key between the outer race 2 and the inner race 5. Thus said driving shaft 3 cannot rotate backward so that the backlash of transmission can be finally prevented. Fig.2(a) and 2(b) show the backlash preventing magnetic apparatus in accordance with the another embodiment. The difference between the another and preferred embodiments is that said projections 4 are formed along the circumferential surface of the outer race 2. Iherfore, the driving shaft 3 rotates clockwise, at the same time, said innner race 5 rotates to the same direction, but the rotating body 7, annular plate 8 and backlash preventing roller 9 placed between the outer race 2 and inner race 5 do not rotate by means of the projection 4, as not same to the preferred embodiment. In addition, said driving shaft 3 rotates counter-clockwise as shown in Fig 2. (b), as same to the preferred embodiment, said backlash preventing roller 9 is pushed to a narrow of width between the outer race 2 and the inner race 5. Thus said driving shaft 3 cannot rotate backward so that the backlash of transmission can be finally prevented. Accordingly, the backlash preventing magnetic apparatus in accordance with the present invention prevents futher backlash after degree, thereby resulting in no overload on the whole apparatus and effectively preventing reverse rotation in case of a sudden negative load. Futhere, the backlash preventing magnetic apparatus in accordance with the present invention may be applied in various transmission, i.e. transmission of auto-bycycles, vehicles, ships, etc. In addition, in case of free rotation, the driving shaft 3 rotates in high speed, if any, generating very small friction, so that little noise and heat of friction is generated. Said degree can be changed under the given conditions, if necessary. While specific embodiments of the invention have been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principle.

Claims: What is Claimed is : 1. A backlash preventing apparatus for a transmission of a vehicle having an out race fixed to a body, an inner race fixed to a driving shaft characterized in that said backlash preventing apparatus includes ; a plurality of projections formed on a cirumfereontial surface of said inner race ; a plurality of rotating bodies disposed between said outer race and said inner race so that said rotating bods can be combined with said projections ; a permanent magnet mounted on said each rotating bodies ; a annular place supporting said rotating bodies and a backlash preventing roller disposed respectively between said rotating bodies, wherein said backlash preventing roller enables said inner race to rotate in a first direction and prevents rotation in a reverse direction. 2. A backlash preventing apparatus according to claim 1, wherein said projections are formed on a circumferential surface of said outer race.

Inventors: HA JUNG YONG, HA, JUNG, YONG
Applicants: HA JUNG YONG, HA, JUNG, YONG
Application year: 1992
Main classification: F16D41
IPC codes: F16D41