Automobile transmission device

Abstract: In a automobile transmission system, comprising a planet gear (6) interposed between the output gear and the speed differentiator (7) of a transmission device, a gliding hood (8) is provided additionally on the outer casing (70) of said speed differentiator (7); by the dynamic steering capability of the planet gear, power transmitting on the output gear assembly may be delivered by the planet gear active in direct or reverse rotation; moreover, by the displacement of the gliding hood (8) on the outer casing (70) of the speed differentiator (7) the power being transmitted by the planet gear (6) in direct or reverse rotation may be delivered way to the speed differentiator (7), eventually as output by way of the output shaft (5) on the output end on both sides of the speed differentiator (7), thus controlling the vehicle to move forwards or backwards, with the input gear (21,22,23) and the output gear (51,52,53) devoted solely to take charge of speed regulation without regard to direction of vehicle movement, forwards or backwards, thus making possible structural simplification of automobile transmission system while promoting operational efficiency and life in service as well.

Description: This invention relates to an automobile transmission device, more specifically it relates to an automobile transmission system serving to control the forward and reverse movement of an automobile by means of a planetary gearset, so as to achieve increased output power and prolonged service life. Efforts directed at the development of conventional automobile transmission systems have been continuous for a very long time. While there have been quite a number of truly commendable innovations and developments in automobile transmission systems, the ultimate design has never been other than the manipulation and co-ordination of gear assemblies, simply for the reason that, so far as control of a vehicle's forwards or backwards movement is concerned, a gear assembly is doubtless a most effective form of design. Conventional designs of automobile transmission systems are complicated in structure, as can be appreciated by referring to gear assembly layout, comprising essentially an input gear assembly serving to feed transmission power and an output gear assembly serving to deliver power. A vehicle's velocity, advancing or reversing, is controlled by matching co-ordination between the input gear assembly and the output gear assembly. With a conventional design of transmission system, to get it to work, respective input gears and output gears must be coupled in an open mode or by engagement, resulting inevitably in constant engagement between the input gear assembly and the output gear assembly. This leads to a reduction in the expected service life of the entire gear assembly system. All the relevant input and output gear assemblies must go through a change in running direction in order to control the active status of the vehicle, forward or backward movements inclusive, and that means an additional burden to the gear system. Also co-ordination between all the working gear assemblies is required. In view of the foregoing, the inventor has for some time been working out possible solutions, and eventually come out with an RDT, a revolutionary direct transmission, an illustration of which is shown in Fig. 6. This known automobile transmission device is described in my US patent specification no. 5437205 wich shows the features of the preamble of claim 1. In addition to being awarded patents in more than one country, it was granted three medals at the Pittsburg International Invention Fair, USA, May 1998. The most salient feature of the invention lies in making possible sustained operation of respective input, and output gear assemblies 1', 2' under engaged conditions, so that power loss is kept to the minimum, and mechanical damage is avoided at the same time. Optimum permutation/combination techniques are utilised, so that a maximised shifting of gear ratios is achieved with the minimum possible gear assemblies. The inventor is working for even better products; and, in the process, has found the following issues pertinent to the existing conventional arts, deserving immediate solutions: 1. In a conventional design of vehicle transmission, the input gear 1' in conjunction with the output gear 2', in addition to being responsible for speed variations, has to control the vehicle's forward/backward movements, such a task necessarily resulting in a more complicated structure. 2. In a conventional design of vehicle transmission, to control the vehicle's forward/backward movements, the responsible gears 1', 2' necessarily have to go through a change in direction of rotation, and that inevitably results in interactive wearing of the gears 1', 2', and their service life is thus greatly prejudiced; 3. According to traditional arts, the automobile transmission derives its power by a conical head 30' which carries a spring-like unit 31' in rotation, so that power is transmitted to the input gear 1'. However, due to lack of consistent holding of the interfacing contact between the conical head 30' and the spring-like unit 31', idle running is often the case, and that means a waste of power; and 4. In an automobile transmission of a conventional design, matching between the input gear 1' and the output gear 2' is controlled by means of rods 41' that are driven by a gearing disk 4', so that speed variation can be made. Unfortunately, however, the rods 41' in the process can tilt, and that results in inconsistent coupling between the input gear 1' and the output gear 2', such that the power output is reduced. An aim of the present invention is to provide an automobile transmission comprising the installation of a planetary gearset between the output gear and the speed differentiator so that, by the ability to effect diversion of transmission, the planetary gearset is able to control the vehicle in its forward/backward movements, so that the input gear and the output gear assemblies may be solely and entirely utilised in the control of speed variation. Another aim of the present invention is to provide an automobile transmission which is of simple structure, upgraded output power and prolonged service life. A further aim of the present invention is to provide an automobile transmission having an adaptor employed in place of a conventional conical head, a ratchet edge being provided on the interfacing contact between the adaptor and a spring-like unit, resulting in an overlapping engagement, so that a more reliable transmission of power is made possible with substantial abatement of power wastage. A further aim of the present invention is to provide an automobile transmission wherein rolling beads are employed in place of conventional rods, to provide accuracy realised by the extent of contact that rolling beads provide, so more accurate coupling co-ordination is made possible between the input gear assembly and the output gear assembly. The invention will now be described in greater detail, by way of example, with reference to the drawings, in which:- Figure 1 is a cross-sectional view of an automobile transmission device constructed in accordance with the invention; Figure 1A is an exemplary illustration of the device of Figure 1 under execution of a first sleeving operation; Figure 1B is an exemplary illustration of the device of Figure 1 under execution of a second sleeving operation; Figure 1C is an exemplary illustration of the device of Figure 1 under execution of a third sleeving operation; Figure 2 is a cross-sectional view of a braking structure of the device of Figure 1, active in operation; Figure 3A is an exploded cross-sectional view of the structure of a first spring-like unit of the device of Figure 1; Figure 3B is an illustration of the first spring-like unit; Figure 3C is an illustration of a second spring-like unit of the device of Figure 1; Figure 4A illustrates a first form of speed regulation disk of the device of Figure 1; Figure 4B illustrates a second form of speed regulation disk of the device of Figure 1; Figure 4C illustrates a third form of speed regulation disk of the device of Figure 1; Figure 4D illustrates a fourth form of speed regulation disk of the device of Figure 1; Figure 4E illustrates a fifth form of speed regulation disk of the device of Figure 1; Figure 4F illustrates a sixth form of speed regulation disk of the device of Figure 1; Figure 5A illustrates a first form of power transmission routing according to the invention; Figure 5B illustrates a second form of power transmission routing according to the invention; Figure 5C illustrates a third form of power transmission routing according to the invention; Figure 5D illustrates a fourth form of power transmission routing according to the invention; Figure 5E illustrates a fifth form of power transmission routing according to the invention; Figure 5F illustrates a sixth form of power transmission routing according to the invention; and Figure 6 is an illustration of the structural perspective of a conventional automobile transmission system. Referring to the drawings, Figure 1 shows an automobile transmission system having a transmission shaft 1 having one end connected to the power source of the automobile (not shown), and the other end connected to an input shaft by means of reduction gears 10, 20, whereby power from the source is transmitted to the input shaft 2. The input shaft 2 is provided with three or more input gears 21, 22, 23, the first input gear 21 being mounted directly onto the input shaft 2, the second input gear being rotatably mounted on the input shaft 2, and the third input gear 23 being rotatably mounted on a sleeving 220 as an extension of the second input gear 22. In addition, a respective spring-like unit 30, 31 is provided behind each of the second and third input gears 22, 23. A speed regulation disk 4 is provided behind the two spring-like units 30, 31, the speed regulation disk having rolling beads 40, 41 overlying the surface of contact between the speed regulation disk 4 and the two spring-like units. Thus, rotation of the speed regulation disk 4 causes the rolling beads 40, 41 either to bear upon, or else be set loose from, the two spring-like units 30, 31. Once compressed, the spring-like units 30, 31 will clamp the second and the third input gears 22, 23 onto the input shaft 2, so as to rotate with the input shaft. On the contrary, once the two spring-like units 30, 31 are set loose, the said second and third input gears 22, 23 will release control by the input shaft 2; so that, by changing the angle of rotation of the speed regulation disk 4, control of the second and the third input gears 22, 23 is permitted, and speed regulation is accomplished. The input gears 21, 22, 23 respectively mesh with three output gears 51, 52, 53 each mounted on an output gear 5. A planetary gearset is provided on the output shaft 5 behind the three output gears 51, 52, 53, the planetary gearset 6 having a central sun gear 60, a ring gear 61, and a plurality of planetary gears 62. An intermediate transmission shaft 54 extends from the output gears 51, 52, 53 to link to the sun gear 60; so that, by the action of the three output gears 51, 52, 53, the planetary gearset 6 is carried in rotation. The planetary gearset 6 is provided with front and rear covers 63, 64, the covers being locked to each other by means of shafts 65, so that the covers can rotate in step with the planetary gears 62. The perimeter of the front cover 63 is extended to point outside the ring gear 61, while the outer rim of the rear cover 64 is provided with a face gear 640. Referring now to Figures 1A, 1B and 1C, a speed differentiator 7 is mounted behind the planetary gearset 6. A sleeving 8 has an inner edge which is inserted into the speed differentiator casing 70, so that the latter rotates therewith to transfer power. A control rod 80 is attached to the sleeving 8 so that the sleeving 8 can slide on the speed differentiator casing 70. Consequently, power applied to the planetary gearset 6 is transmitted to the speed differentiator 7, to be delivered as a power output from the output shaft 5 by way of an umbrella gear 71 on both sides. On the edge on both sides of the sleeving 8 are mounted respectively gear assemblies 81, 82. Thus, when the sleeving 8 is pushed backwards, the gear assembly 81 is brought into engagement with the face gear 640 on the rear cover 64, so that power is output by way of the ring gear 61. When the sleeving 8 moves forward, the gear assembly 82 is brought into engagement with the end gear 610 on the extended portion of the ring gear 61, so that power is delivered by way of the ring gear 61, and the purpose of controlling the vehicle to move ahead or backwards is achieved. A characteristic feature of the planetary gearset 6 is that, when the ring gear 61 is unable to move due to external obstruction, the planetary gearset 62 will respond by following the sun gear 60 in rotation, in the same direction as the sun gear. Further, when the planetary gears 62 are blocked, the ring gear 61 will respond by rotating in a direction contrary to the direction in which the sun gear 60 rotates. So, if the user sets the control rod 80 in the middle position, the sleeving 8 will not come into contact with any motor device, so that no output is possible from the output shaft 5, and idle running takes place. On the contrary, once the control rod 80 is pushed backwards, the sleeving 8 will push ahead, so that the gear assembly 81 and the face gear 640 on the rear cover 64 are brought into engagement with each other, whereupon power is transmitted via the planetary gears 62 to the speed differentiator 7, and output by way of the output shaft 5, and the vehicle will remain a forwards movement. When the control rod 80 is pushed ahead, the sleeving 8 will move backwards, so that the gear assembly 82 is brought into engagement with the end gear 610 on the extended portion of the ring gear 61, and power is transmitted by way of the ring gear 61 to the speed differentiator 7, and on to the output shaft 5 for output, whereupon the vehicle responds by moving backwards. Referring once again to Figure 1, it will be appreciated that restriction of the movement o the planetary gearset 6, is executed by the application of a braking layer 66 over the outer part of the front cover 63 that is driven to simultaneous rotation with the planetary gears 62, while a further braking layer 67 may also act on the exterior part of the ring gear 61. The provision of the braking layers 66, 67 is such that, while the vehicle is moving forwards, the braking layer 67 is active to render the ring gear 61 inoperative; and, when the vehicle is reversing, the braking layer 66 is active so that movement of the planetary gears 62 around the sun gear 60 is suspended. When both the braking layers 66, 67 are active, the vehicle comes to a full stop. Referring now to Figure 2, it will be appreciated that the present invention may very well incorporate the latest technology, such as the advanced ABS braking system 9, so as to reinforce the braking performance. The ABS braking system comprises two braking disks 90, 91, each equipped with a braker 92, 93, and with the core being extended to incorporate braking gears 94, 95. The perimeters of the front cover 63 and the ring gear 61 are respectively equipped with external gears 96, 97 in engagement with the two braking gears 94, 95, to permit individually executed braking actions with the braking disks 90, 91 using the two brakers 92, 93, with the purpose of restricting the planetary gears 62 or the ring gear 61 from rotation, thereby controlling the vehicle to move ahead or backwards. Referring to Figures 3A and 3B, the first spring-like unit 30 installed between the input shaft 2 and the sleeving 220 on an extension of the second input gear 22, the front end of the unit 30 being locked to the input shaft 2 across the sleeving 220, using a fixing pin 300, so that the first spring-like unit 30 may follow in step with the second input gear 22 in rotation about the input shaft 2, the open face of the rear end of the first spring-like unit 30 being furnished with a ratchet 301. On the input shaft 2, located behind the first spring-like unit 30, there is provided an adaptor 32. On the wall around its front end there is also provided a ratchet 321 aligned with the ratchet 301 for coupling with the adaptor, the adaptor being locked to the input shaft 2 by a fixing pin 320 so that the adaptor may rotate with the input shaft 2. A stop nut 34 is locked onto the rear side of the adaptor 32 so as to fix the position of all relevant assemblies. On the perimeter of the adaptor 32, there is provided a pusher sleeving 36 whose front end abuts the outmost rim of the ratchet 301 of the first spring-like unit 30, the rear side of the pusher sleeving 36 abutting upon the rolling beads 40 of the speed regulation disk 4, and the periphery of the pusher sleeving 36 being provided with a spring 360. When the pusher sleeving 36 is pushed forwards by the rolling beads 40, the first spring-like unit 30 is compressed so that the adaptor 32 is separated from the first spring-like unit 30, whereupon it is unlikely for power from the input shaft 2 to be transmitted to the first spring-like unit 30 by way of the adaptor 32. When the pusher sleeving 36 regains its form by the action of the spring 360 once the external power is removed, the adaptor 32 will once again engage itself with the first spring-like unit 30. What follows is a follow up rotation of the second input gear 23 in step with the input shaft 2; and, as the input shaft 2 turns faster, the first spring-like unit 30 will tighten up proportionately. That means yet greater momentum is produced and forthcoming from the second input gear 22 and also, that coupling between the adaptor 32 and the ratchets 301, 321 on the first spring-like unit 30 makes possible power transmission without unwanted losses and damages whatsoever. Referring now to Figure 3C, illustrating the layout of the second spring-like unit 31 and the second input gear 22, it can be appreciated that the second spring-like unit 31 and the third input gear 23 are jointly mounted outside the sleeving 220. The second spring-like unit 31 is locked to the sleeving 220 by means of a fixing pin 310 by way of a sleeving 230 formed as an extension of the third input gear 23. On the rear side of the second spring-like unit 31 there is provided an adaptor 33. On that end of the adaptor 33 that is in contact with the second spring-like unit 31 there are furnished interengageable ratchets 311, 331 locked to the sleeving 230 by means of a fixing pin 330. A pusher sleeve 37 abuts the rear side of the second spring-like unit 31, the pusher sleeve 37 being provided with a spring 370 on its perimeter. As regards both its installation and implementation, the second spring-like unit 31 and the third input gear 23 are similar to those for the first spring-like unit 30 and the second input gear 22, as described hereinbefore. Referring to Figures 4A and 5A, it will be appreciated that, to achieve speed variation purposes, the invention utilises the speed regulation disk 4 to control interdependent correlation between the input gear assemblies 21, 22, 23 and the output gear assemblies 51, 52, 53. The speed regulation disk 4 is mounted on the farthest end of the input shaft 2, with its angle of rotation controlled by a revolving lever 42. The speed regulation disk 4 is divided into three equal cells, each furnished with rolling beads 40, 41, one on the inner ring, another on the outer ring, and with the beads 40, 41 being aligned on the same centripetal axis as the speed regulation disk 4, the beads abutting respectively upon the rear side of each of the two pusher sleeves 36, 37. Inbetween said cells are provided four grooves 43, 44, 45, 46 to accommodate the rolling beads 40, 41. The first groove 43 lies on the leftmost position of the inner ring of each cell. The second groove 44 lies on the rightmost position of the inner ring of each cell, in line with the spacing fit for two beads being displaced leftwards. The third groove 45 lies on the rightmost position of the outer ring of each cell, while the fourth groove 46 lies in a position spaced apart by one rolling bead's span off the left side of the third groove 45. All the four grooves 43, 44, 45, 46 gradually merge onto the surface of the speed regulation disk 4 in a direction as guided by the rolling beads 40, 41, so that the beads 40, 41 may slide smoothly into, or out of, any of the grooves 43, 44, 45, 46. The installation described in the foregoing is laid out so that, when the vehicle is at rest, the sleeving 8 rests in the middle position and as such is, and remains, clear of contact with any device (compare Figure 1A), so that transmission of power is denied for output by way of the output shaft 5. This is time concurrent with the speed regulation disk 4 lying by the right side of the first groove 43, with both the rolling beads 40, 41 emerging to the surface of the same speed regulation disk 4. As the vehicle gets started, the sleeving 8 is pushed back such that the gear assembly 81 is brought into engagement with the face gear 640 integral with the rear cover 64 (compare Figure 1B). Even with the vehicle maintaining a forwards movement, the speed regulation disk 4 at this juncture will still deviate by an angle somewhat to the left, while the two rolling beads 40, 41 still rest floating on the surface of the same speed regulation disk 4. Next, both rolling beads 40, 41 will move the two pusher sleeves 36, 37 ahead, so that the first and the second spring-like units 30, 31 being thereby compressed, release the adaptors 32, 33, and that results in the second and the third input gears 22, 23 being rendered inoperative for power transmission, and the first input gear 21 alone is capable of that task (see Figures 4B and 5B). To follow that, transmission of the speed regulation disk 4 continues to result in the dropping of the overlying rolling bead 41 into the fourth groove 46. Being thus acted upon by the spring 370, the pusher sleeve 37 releases the second spring-like unit 31. It is then time for intervention of the third input gear 23 to transmit power, serving, in this instance, to boost power output by way of the output shaft 5 (see Figures 4C and 5C). Next, speed regulation disk 4 is driven to result in the overlying rolling bead 41 moving out of the fourth groove 46, while the rolling bead 40 underneath moves into the second groove 44. It is then time for the second input gear 22 to transmit power, while the third input gear 23 loses the ability to transmit power, and that brings about another change in speed (see Figures 4D and SD). Finally, the speed regulation disk 4 is turned to the dead point, so that both the rolling beads 40, 41 fall into the second groove 44 and the third groove 45 respectively, and the second and the third input gears 22, 23 are thereby driven to transmit power together, achieving maximum output capabilities (see Figures 4E and 5E). When reversing is desired, the first step is to push the sleeve 8 forwards so that the gear assembly 82 is brought into engagement with the gear assembly 610 (see Figure 1C). The speed regulation disk 4 is then turned in the opposite direction to the dead point, so as to drive the overlying rolling bead 41 emerging on the surface of the speed regulation disk 4, while the rolling bead 40 underneath responds by falling into the first groove 43, and a vehicle reversing movement is made (see Figures 4F and 5F). Compared to conventional technologies, such as are represented in the foregoing citations and other prior arts, an automobile transmission system according to the present invention has the following advantages. 1. provision of a planetary gearset to control forwards/backwards movements of a vehicle, so that all the input gears and all the output gears need only take charge of speed variations and nothing else, thereby alleviating operational burdens to all the input/output gears, and rendering smoother power transmission; 2. all the input/output gears maintain constant engagement conditions all the time, and only a constant steering direction needs to be maintained, thus simplifying execution, and avoiding gear inteferences, reflected in reduced failure rates and prolonged service life; 3. provision of ratchet interengagement between the spring-like units and the pusher sleeves, which serves to enhance power transmission efficiency while abating transmission loss, interpreted as far-reaching advances in terms of both upgraded transmission efficiency and energy savings; 4. employment of rolling beads instead of conventional stems or rods for transmission into guided grooves in the speed regulation disk, so that more solid and accurate executions in the compression or releasing of spring-like units are realised, and that also serving to enhance power transmission efficiencies.

Claims: An automobile transmission device comprising: a transmission shaft (1) having a first end linked to the power source of a vehicle, and a second end provided with a reduction gear assembly; an input shaft (2) having a first end provided with a reduction gear assembly which is engageable with the reduction gear assembly of the transmission shaft, first, second and third input gears (21, 22 and 23) mounted adjacent to the reduction gear assembly of the input shaft, the first input gear (21) being fixed to the input shaft, the second input gear being rotatably mounted onto the same input shaft, and the third input gear being rotatably mounted onto a first sleeving (220) formed as an extension of the second input gear; a first spring-like unit (30) mounted between the input shaft and the first sleeving, the front end of said unit being locked to the input shaft and to the first sleeving by a first fixing pin (300), the second end portion of the input shaft being provided with a first adaptor (32) having a first end abutting the first spring-like unit by means of ratchets (301, 321) provided thereon, a second fixing pin (320) being provided between the first adaptor and the input shaft, a first stop nut (34) being locked to that portion of the input shaft between the first adaptor and the second end of the input shaft, a first pusher sleeve (36) being mounted on the perimeter of the first adaptor, the first end of the first adaptor abutting the outermost annular surface of the ratchet of the first spring-like unit, and the periphery of the first pusher sleeve being surrounded by a first spring; a second spring-like unit (31) between the first sleeving and a second sleeving (230) formed as an extension of the third input gear, a first end of said unit being locked to the second sleeving by a third fixing pin (310), a second adaptor (33) being provided on the input shaft between the second spring-like unit and the second end of the input shaft, a first end of the second adaptor forming an overlapping relation with the exposed surface of the second spring-like unit due to the presence of ratchets (311, 331) on both components, the second adaptor and the second sleeving being fixed to each other by a fourth fixing pin (330), a second stop nut being locked to a second end of the second adaptor, a second pusher sleeve (37) being mounted on the perimeter of the second adaptor, a first end of the second pusher sleeve abutting the outermost ring of the ratchet of the second spring-like unit, the perimeter of the second pusher sleeve being surrounded by a second spring; a speed regulation disk (4), mounted on the second end of the input shaft, and in respect of which the angle of rotation is controlled by a lever (42), the speed regulation disk being divided into three cells each provided with a rolling bead (40) on an inner ring, and with a rolling bead (41) on an outer ring, both beads being concentrically aligned with the speed regulation disk, and respectively abutting that side of the second spring-like unit nearest the second end of the input shaft, each cell being further provided with four grooves to accommodate said rolling beads, whereof each first groove (43) lies at one end position of the respective cell and on the inner ring, the respective second groove (44) lies at the other end position of that cell and on the inner ring, that second groove being spaced from said first groove to leave a spacing for two rolling beads lining up side-by-side, the respective third groove (45) lies at the other end position of that cell and on the outer ring, and the respective fourth groove (46) lies in a position at a distance of one rolling bead from the third groove between the third groove and the rolling bead of the outer ring, all said grooves gradually merging onto the surface of the speed regulation disk in the direction in which the rolling beads are guided so that each rolling bead may smoothly enter or leave each of the grooves; and a speed differentiator (7) having an outer casing (70) provided with a slider (8) whose inner rim is engaged with the outer casing of the speed differentiator so that the slider may carry the speed differentiator into rotation, whereby transmission of power is made, a respective gear assembly being provided on either side of the slider, the slider being linked to a control rod (80) serving to carry the slider to slide about on the outer casing of the speed differentiator whose output ends extend to an output shaft (5), a first end of the output shaft being provided with three output gears (51, 52, 53) to form a close engagement with the three input gears; characterised by a planetary gearset (6) mounted on the output shaft behind the three output gears, the planetary gearset including a sun gear (60), the planetary gearset being linked with an intermediate transmission shaft (54) provided as an extension of the three output gears, the perimeter of the planetary gearset being a ring gear (61) engageable with the sun gear by a number of planetary gears (62), covers (63, 64) on first and second ends of the planetary gearset, both covers being interlocked with each other by means of shafts (65) across the planetary gears, the perimeter of the first cover extending to a point outside the ring gear, a first braking device (66) being provided on the first cover, a second braking device (67) being provided on the exterior side of the ring gear, the perimeter of the rim of the second cover being provided with a face gear (640), the extended end of the ring gear being provided with an edge gear (610) which, together with the face gear on the rear cover residing on either end of the slider transit space, can be matched with the gear assembly on the slider. An automobile transmission system according to claim 1, wherein braking layers are provided on the first cover and on the outside of the inner ring gear, as part of the braking assembly, and both layers can be separately controlled so as to ensure the stability of the vehicle when running. An automobile transmission system according to claim 1, wherein said braking assembly is part of an ABS braking system, and comprises two braking disks, each furnished with a braker, the core of each braking disk being extended to incorporate a braking gear, a first external gear being provided on the periphery of the first cover, and a second external gear being provided on the ring gear, so that together these two external gears may be engaged with the two braking gears so as to produce braking actions.

Inventors: TSENG SHENG-TSAI, TSENG, SHENG-TSAI
Applicants: TSENG SHENG-TSAI, TSENG, SHENG-TSAI
Application year: 1998
Main classification: F16H37
IPC codes: F16H37, F16H3