GB2213216A - Transmission construction for pedestrian-operated type work vehicle - Google Patents
Transmission construction for pedestrian-operated type work vehicle Download PDFInfo
- Publication number
- GB2213216A GB2213216A GB8826858A GB8826858A GB2213216A GB 2213216 A GB2213216 A GB 2213216A GB 8826858 A GB8826858 A GB 8826858A GB 8826858 A GB8826858 A GB 8826858A GB 2213216 A GB2213216 A GB 2213216A
- Authority
- GB
- United Kingdom
- Prior art keywords
- belt
- transmission
- engine
- pulley
- tension wheel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D51/00—Motor vehicles characterised by the driver not being seated
- B62D51/04—Motor vehicles characterised by the driver not being seated the driver walking
- B62D51/06—Uniaxle walk-type tractors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H9/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members
- F16H9/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion
- F16H9/04—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes
- F16H9/12—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members
- F16H9/14—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members using only one pulley built-up out of adjustable conical parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
- B60K17/342—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having a longitudinal, endless element, e.g. belt or chain, for transmitting drive to wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D51/00—Motor vehicles characterised by the driver not being seated
- B62D51/004—Motor vehicles characterised by the driver not being seated characterised by the transmission
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- General Engineering & Computer Science (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Arrangement Of Transmissions (AREA)
- Transmissions By Endless Flexible Members (AREA)
Description
C n ' 2213216 TRANSMISSION CONSTRUCTION FOR PEDESTRIAN-OPERATED TYPE WORK
VEHICLE k The present invention relates to a transmission construction for a pedestrian-operated type work vehicle having an engine disposed at a vehicle front end, an output shaft extending from the engine laterally of the vehicle body and an input shaft of a transmission casing for travelling disposed laterally of the vehicle body and rearwardly of the engine.
A conventional pedestrian-operated type work vehicle of the above-noted type is known; for example, from a Japanese utility model laid-open under 57-47421. This vehicle has a belt type travelling transmission including a plurality of transmission belts wrapped about an engine output shaft and a transmission input shaft such that each belt provides a different transmisson ratio and a plurality of tension wheels associated with the respective belts and selectively -2engaged with the belts for providing a desired transmission ratio; namely, the transmission acts also as a travelling change-speed device.
With the above construction; however, since a change-speed operation is effected step by step, a fine adjustment of vehicle speed is impossible. Moreover,- if it is attempted to extend the adjustable speed range, the number of transmission belts needs to be increased thereby enlarging the axial dimension of the engine output shaft or of the transmission input shaft.
With view to the above-described state of the art, the primary object of the present invention is to to provide a compact transmission capable of providing a wide speed range and acting also as a finely adjustable change-speed device, the improved transmission being superior in safety also.
In order to accomplish the above object, a transmission construction for a pedestrian-operated type work vehicle according to the present invention comprises: an engine disposed at a front end of a vehicle body and covered with an engine cover, with an engine output shaft being projected laterally from 1 h 1 the vehicle body; a transmission disposed rearwardly of the engine, with a transmission input shaft being projected laterally from the vehicle body in the same projecting direction as the engine output shaft; a belt- drive pulley fitted on the engine output shaft and constituted by a split belt pulley; a belt-driven pulley fitted on the transmission input shaft and constituted by a non-split belt pulley; a transmission belt wrapped on between the belt-drive pulley and belt-driven pulley, the belt being operable to transmit power from the engine to the transmission and being covered with a belt cover; and an operational member for adjustably varying a wrapping diameter of the drive belt pulley relative to the transmission belt; wherein the operational member is positioned forwardlyof the belt cover and rearwardly of a front end of the engine cover and also recessed from a lateral outer end of the belt cover towards the vehicle body on the side of the engine output shaft.
Functions and effects of the above construction will be described next.
With an operation of the operational member, the wrapping diameter of the belt relative to the engine output shaft is varied whereby a transmission ratio between the engine output shaft and the transmission input shaft-is also varied. That is to say, the belt i type transmission construction between the engine and the transmission acts also as a change-speed device.
Then, if the above adjustment of the wrapping diameter is effected multistepwise or steplesswise, it becomes possible to decrease the number of transmission belts while increasing the speed steps or effecting a stepless change-speed operation..
Also, since the change-speed operational member is positioned as recessed both from the front end of the engine cover and the lateral outer end of the belt cover, the possibility of inadvertent and dangerous contact betweeen the member and the peripheral objects such as crops or plants may be advantageously reduced.
As the result, with the transmission construction of the present invention, while the known advantage of the belt type transmission coacting as a change-speed device is retained, the construction may be formed compact without enlarging the axial dimension of the engine output shaft or of the transmission input shaft since a fine speed adjustment is possible over an extended speed range with a small movement of the split type belt pulley.
Moreover, the positional arrangement of the change-speed operational member has achieveda greater operation or storage safety for the vehicle thanks to the reduced possibilityof inadvertent contact between 0 1 the member and peripheral objects.
Further, according to one preferred embodiment of the present invention, the adjustment of the wrapping diameter by the operational member is effected via an automatic tension wheel for biasing the transmission belt. Also, between the split type belt pulley and the automatic tension wheel or between the. automatic tension wheel and the non-split type belt pulley, there is provided a belt support wheel for receiving the transmission belt in a direction opposed to the belt-biasing direction of the automatic tension wheel.
More particularly, in the prior art, the automatic tension wheel alone effects a belt length adjustment for speed change on the belt portion between the pulleys. With the present invention; on the other hand, the belt length adjustment for that purpose is effected between a belt portion between either of the pulleys and the belt support wheel. That is to say, the length of the belt portion to be pivotably adjusted by the automatic tension wheel becomes shorter by the length corresponding to that between the belt support wheel and either pulley with no automatic tension wheel being interposed therebetween. As the result, it becomes possible to control a longer belt portion in spite of relatively short operating stroke of the tension wheel.
X is Nore specifically, because of the belt support wheel, it becomes possible to increase the adjustable length of t he belt relative to the operational stroke of the automatic tension wheel. Accordingly, if the tension wheel is to inwardly bias the belt loop, the adjustable speed range, i.e. the operating stroke of the operational member may be safely increased with avoiding contact between the drive belt portion and the return belt portion. On the other hand, if the tension wheel is to outwardly bias the belt loop, the adjustable speed range may be also increased while minimizing the outward projection of the belt. In short, the above construction also contributes to the compactness and wide speed range of the transmission construction.
The invention will be further described, by way of example, with reference to the accompanying drawings, which illustrate a transmission construction for a pedestrian-operated type work vehicle, according to an embodiment of the present invention. In the drawings:
Fig. 1 is an overall side view of a pedestrianoperated type agricultural vehicle, Fig. 2 is a partially cutaway plane view of a change-speed device, and Fig. 3 is a side view of the change-speed device.
91 v 1 Preferred embodiments of the -present invention will be particularly described hereinafter with reference to the accompanying drawings.
As shown in Fig. 1, a peaestrian-operatea type agricultural work vehicle comprises an automobile vehicle body including a travelling wheel pair 1, an engine E disposed at a front of the body, a steering handle 2 disposed at a rear of the body, the handle 2 being pivotable about a vertical axis P to switch over its forward and rearward orientation and a hitch 3 for connection with various work implements such as a rota. ry plough.
Referring now to Figs. 2 and 3, a split type pulley 5 as a belt-drive pulley is secured on an output shaft 4 connected with the engine and projecting laterally from the vehicle body, with the pully 5 being rotatable in unison with the engine. On the other hand, a non-split type pulley 9 as a belt driven pulley is secured on to be rotatable in unison with a transmission input shaft 7 extending from a transmission casing 6 disposed rearwardly of the engine, with the input shaft 7 projecting laterally from the vehicle body. The non-split pulley 9 acts also as a clutch body including a multi-plate main clutch 8. A transmission belt 12 is wrapped about the pulleys 5 and 9, an automatic tension wheel 10 and a belt support wheel 11. In operation, by operating a change-speed operational member 14 attached to the engine E via a support 13, a wrapping diameter of the belt relative to the pulley 5 is adjusted for effecting a speed change. The above entire construction constitutes a belt type stepless changespeed device as an auxiliary travelling -change-speed.
More particularly, the change-speed operational member 14 is attached to the support 13 to be rotatable relative thereto. For this end, the operational member 14 is operatively connected with a pully operating arm 17 via a connector element 15 screwed to an end of a screw shaft portion 14a and a pivot link 16. In operation, with a rotational operation of the member 14, the connector element 15 advances with a screw motion along the rotational axis of the member 14 thereby rotating a rotational support shaft 18 of the pulley operating arm 17. Then, this arm 17 slides a movable pulley portion 5a along a rotational axis thereof closer to a fixed pulley portion 5b or away from the same by means of a spring 19.
Referring now particularly to a positional 7 arrangement of the above change-speed operational member 14, this member 14 is disposed forwardly of a belt cover covering the transmission belt 12 and the pulleys 5 and 9 for the sake of safety. Further, the operational member 14 is recessed both from a front end of an engine cover 21 toward the rear of the vehicle body and from a lateral outer end of the belt cover 20. This positional arrangement is advantageous for avoiding any projections of the operational member 14 from the vehicle body which projections may result in inadvertent and dangerous contact of the member with peripheral objects.
As shown in Figs. 2 and 3, an indicator-mark attaching member 22 is attached to the connector element 15 to be movable together therewith. This indicator-mark attaching member 22 includes a window for viewing an indicator 22a attached to the member 22. On the other hand, the support 13 includes a speed display panel 24 having speed-indicating characters a, b and c. The above elements together therewith constitute a speed display device of the belt type stepless change-speed device.
the rotational operation of In operation, with the change-speed operational member 14, the indicator 22a moves within the window to indicate one of the characters a or b or c corresponding to the set speed.
Next, a belt-length adjusting mechanism will be particularly described.
The belt support wheel 11 is fixedly secured to a support 30, a support shaft 31 and an attaching bolt 32 so as not to change its attaching position. Also, the wheel 11 receives and supports an inner loop of the transmission belt 12 between the automatic tension wheel 10 and the nonsplit type belt-driven pulley 9. On the other hand, the automatic tension wheel 10 is attached to the transmission casina 6 via a pivot support arm 33 and the support shaft 31 such that the wheel 10 may pivot about an axis of the shaft 31. Further, the tension wheel 10 is pivotably biased by a tension spring 34 acting on the pivot support arm 33 so as to inwardly urge and tension the transmission belt loop 12. That is, this automatic tension wheel 10 is pivotably operable to bias the belt portion between the supports, i.e. the split pulley 5 and the belt support wheel 11 narrower than the entire drive belt portion extending between the pulleys 5 and 9, thereby adjusting an extended length of the belt for its relatively short stroke.. Also, the tension wheel 10 effects the automatic tension adjustment by pulling the belt 12 towards its loop inner side with a reduction in the wrapping diameter of the split pulley 5.
v 1 In an alternative embodiment, it is possible to adapt the belt support wheel 11 to act between the split belt-driven pulley 5 and the automatic tension wheel 10.
Further, this belt support wheel 11 may be also employed in a transmission construction where the automatic tension wheel 10 outwardly biases the transmission belt 12 towards the loop outside. In this case, the belt support wheel 11 is to be arranged so as to recieve the outer loop side of the belt 12.
While the present invention has been detailed thus far as embodied in an agricultural work vehicle, the spirit and principle of the invention may be also embodied in other work vehicles such as a planting machine, combine, binder, transporter or the like.
Claims (5)
1. A transmission construction for a pedestrianoperated type work vehicle, comprising:
an engine disposed at a front end of a vehicle body and covered with an engine cover, with an engine output shaft being projected laterally from the vehicle body; a transmission disposed rearwardly of said engine, with a transmission input shaft being projected laterally from the vehicle body in the same projecting direction as said engine output shaft; belt-drive pulley fitted on said engine output shaft and constituted by a split belt pulley; belt-driven pulley fitted on the transmission input shaft and constituted by a non-split belt pulley; a transmission belt wrapped on between said beltdrive pulley and belt- driven pulley, the belt operable to transmit power from said engine to transmission and being covered with a belt cover; and an operational member for adjustably varying a wrapping diameter of said belt-drive pulley relative to said transmission belt; wherein said operational member is positioned being said 1 1 -13forwardly of the belt cover and rearwardly of a front end of the engine cover and also recessed from a lateral outer end of the belt cover towards the vehicle body on the side of said engine output shaft.
2. A transmission construction as claimed in Claim 1, wherein said operational member is rotatable while being positionally fixed in an axial direction thereof and operable to move a connector element.
3. A transmission construction as claimed in Claim 1 or 2, further comprising:
an automatic tension wheel for biasing and tensioning said transmission belt; and a belt support wheel fixed between said drive pulley and said automatic tension wheel and for receiving said transmission belt in a direction opposed to the belt biasing direction of said automatic tension wheel.
4. A transmission construction as claimed in Claim 1 or 2, further comprising:
an automatic tension wheel for biasing and tensioning said transmission belt; and a belt support wheel fixed between said automatic 1 -14tension wheel and said driven pulley and for receiving said transmission belt in a direction opposed to the belt biasing direction of said automatic tension wheel.
5. A transmission construction as claimed in Claim 3 or 4, wherein said automatic tension wheel is operable to bias said transmission belt towards an inner side of belt loop.
Published 1989 at The Patent Office, State House.6671 High Holbom,London WCIR 4TP. Further cOPies Maybe obtained from The Patent office, Sales Branch, St Mary Cray, Orpmgton, Kent BR5 3RD. Printed byMultiplex tecbwques Itd, St Mary Cray, Kent, Coj 1187 f f! k
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987175657U JPH0178760U (en) | 1987-11-17 | 1987-11-17 | |
| JP62291446A JPH01132426A (en) | 1987-11-18 | 1987-11-18 | Structure for traveling transmitting power of walking type tractor |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8826858D0 GB8826858D0 (en) | 1988-12-21 |
| GB2213216A true GB2213216A (en) | 1989-08-09 |
| GB2213216B GB2213216B (en) | 1991-12-11 |
Family
ID=26496858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8826858A Expired - Fee Related GB2213216B (en) | 1987-11-17 | 1988-11-17 | Transmission construction for pedestrian-operated type work vehicle |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR930000801B1 (en) |
| DE (1) | DE3838754A1 (en) |
| FR (1) | FR2623264B1 (en) |
| GB (1) | GB2213216B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3267596B2 (en) * | 2000-05-19 | 2002-03-18 | ダイハツ工業株式会社 | Continuously variable transmission |
| DE602006008610D1 (en) | 2005-04-29 | 2009-10-01 | Mtd Products Inc | THROUGH AN INLINE BELT DRIVEN STEERRADKUPPKLUNG |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB422616A (en) * | 1933-05-16 | 1935-01-15 | Rud Sack | Improvements in variable-speed friction gear and in indicating mechanism combined therewith |
| GB639817A (en) * | 1948-06-09 | 1950-07-05 | Mason James A | Improvements in or relating to switch control devices for dynamically braked, electrically driven machines |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH228731A (en) * | 1942-05-09 | 1943-09-15 | Schiess Oskar | Transmission. |
| FR1002030A (en) * | 1946-07-17 | 1952-03-03 | Variable radius pulley speed controller | |
| DE840511C (en) * | 1950-11-09 | 1952-06-03 | Albert Dipl-Ing Krey | Change gears, especially for small agricultural tractors (single-point tractors) |
| US2805583A (en) * | 1953-06-27 | 1957-09-10 | Reimers Getriebe Kg | Infinitely variable power transmission |
| DE1170694B (en) * | 1958-01-24 | 1964-05-21 | Hako Werke | Wheelless tiller with guide bar and automatic milling shaft gear |
| US3079804A (en) * | 1960-10-25 | 1963-03-05 | Falk Corp | Variable speed drive |
| FR2457627A1 (en) * | 1979-05-28 | 1980-12-26 | Faur Jean | Belt drive for garden cultivator - has spring loaded variable speed pulley on swinging arm for forward and reverse and neutral |
| CH642817A5 (en) * | 1980-06-04 | 1984-05-15 | Poettinger Alois Maschf | Haymaking machine for swathing and tedding. |
| FR2499656A1 (en) * | 1981-02-09 | 1982-08-13 | Cuinier Henri | Variable speed drive for massage machine - includes belt drive using variable diameter drive pulley adjusted by altering axial displacement of one of its flanges |
| US4634403A (en) * | 1985-11-18 | 1987-01-06 | Tennant Company | Belt drive |
-
1988
- 1988-11-16 KR KR1019880015070A patent/KR930000801B1/en not_active IP Right Cessation
- 1988-11-16 DE DE3838754A patent/DE3838754A1/en active Granted
- 1988-11-17 FR FR8814956A patent/FR2623264B1/en not_active Expired - Fee Related
- 1988-11-17 GB GB8826858A patent/GB2213216B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB422616A (en) * | 1933-05-16 | 1935-01-15 | Rud Sack | Improvements in variable-speed friction gear and in indicating mechanism combined therewith |
| GB639817A (en) * | 1948-06-09 | 1950-07-05 | Mason James A | Improvements in or relating to switch control devices for dynamically braked, electrically driven machines |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2623264B1 (en) | 1995-03-10 |
| GB8826858D0 (en) | 1988-12-21 |
| KR930000801B1 (en) | 1993-02-05 |
| DE3838754A1 (en) | 1989-06-08 |
| KR890007980A (en) | 1989-07-06 |
| FR2623264A1 (en) | 1989-05-19 |
| DE3838754C2 (en) | 1991-02-28 |
| GB2213216B (en) | 1991-12-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19951117 |