In the transmissions of the background art, two larger-diameter gears are mounted on a final shaft thereby causing an increase in weight of the transmission. The present invention reduces the weight of a transmission by mounting only one larger-diameter gear on a final shaft. The transmission of the
In the transmissions of the background art, two larger-diameter gears are mounted on a final shaft thereby causing an increase in weight of the transmission. The present invention reduces the weight of a transmission by mounting only one larger-diameter gear on a final shaft. The transmission of the present invention includes an output shaft; a countershaft extending parallel to the output shaft; an intermediate shaft extending parallel to the output shaft; a forward drive gear rotatably supported relative to the countershaft; a reverse drive gear rotatably supported relative to the countershaft; a first intermediate gear rotatably supported relative to the intermediate shaft, the first intermediate gear normally meshing with the reverse drive gear; a second intermediate gear rotatably supported relative to the intermediate shaft, the second intermediate gear being interlocked with the first intermediate gear to rotate therewith; an output shaft driven gear fixed to the output shaft, the output shaft driven gear being normally meshing with the forward drive gear and the second intermediate gear; and a gear selecting and fixing device axially movably mounted on the countershaft for selectively fixing the forward drive gear and the reverse drive gear to the countershaft.
대표청구항▼
What is claimed is: 1. A transmission comprising: a main shaft; an output shaft; a countershaft extending parallel to said output shaft and the main shaft, the counter shaft being in a position that is below the main shaft and above the output shaft in a vertical direction of the transmission; an i
What is claimed is: 1. A transmission comprising: a main shaft; an output shaft; a countershaft extending parallel to said output shaft and the main shaft, the counter shaft being in a position that is below the main shaft and above the output shaft in a vertical direction of the transmission; an intermediate shaft extending parallel to said output shaft; a forward drive gear being rotatably supported relative to said countershaft; a reverse drive gear being rotatably supported relative to said countershaft; a first intermediate gear being rotatably supported relative to said intermediate shaft, said first intermediate gear meshing with said reverse drive gear; a second intermediate gear rotatably supported relative to said intermediate shaft, said second intermediate gear being interlocked with said first intermediate gear to rotate therewith; an output shaft driven gear fixed to said output shaft, said output shaft driven gear meshing with said forward drive gear and said second intermediate gear, wherein said output shaft driven gear is the only gear attached to said output shaft; and a gear selecting and fixing device axially and movably mounted on said countershaft for selectively engaging said forward drive gear and said reverse drive gear to said countershaft. 2. The transmission according to claim 1, wherein said forward and reverse drive gears, said first and second intermediate gears, and said output shaft driven gear are constant-mesh gears. 3. The transmission according to claim 1, further comprising at least one hydraulic multi-plate clutch. 4. The transmission according to claim 1, further comprising a main shaft operatively engaged with a crankshaft through a primary driven gear and a torque converter. 5. The transmission according to claim 4, further comprising: a first speed hydraulic multi-plate clutch; a second speed hydraulic multi-plate clutch; and a third speed hydraulic multi-plate clutch. 6. The transmission according to claim 5, wherein said forward and reverse drive gears, said first and second intermediate gears, and said output shaft driven gear are constant-mesh gears. 7. The transmission according to claim 1, wherein the gear selecting and fixing device selectively fixes said forward drive gear and said reverse drive gear directly to the countershaft. 8. The transmission according to claim 7, further comprising at least one hydraulic multi-plate clutch. 9. The transmission according to claim 1, wherein a forward end of the output shaft extends further in a forward direction than forward ends of the counter shaft and the intermediate shaft. 10. A power unit for a four-wheeled vehicle comprising: an internal combustion engine having a crankshaft arranged with respect to a longitudinal direction of said engine; a transmission including a main shaft operatively engaged with said crankshaft through a torque converter and a primary drive gear on said crankshaft and a primary driven gear on said main shaft; an output shaft; a countershaft extending parallel to said output shaft; an intermediate shaft extending parallel to said output shaft; a forward drive gear being rotatably supported relative to said countershaft; a reverse drive gear being rotatably supported relative to said countershaft; a first intermediate gear being rotatably supported relative to said intermediate shaft, said first intermediate gear meshing with said reverse drive gear; a second intermediate gear rotatably supported relative to said intermediate shaft, said second intermediate gear being interlocked with said first intermediate gear to rotate therewith; an output shaft driven gear fixed to said output shaft, said output shaft driven gear meshing with said forward drive gear and said second intermediate gear, wherein said output shaft driven gear is the only gear attached to said output shaft; and a gear selecting and fixing device axially and movably mounted on said countershaft for selectively engaging said forward drive gear and said reverse drive gear to said countershaft, wherein a forward end of the output shaft extends further in a forward direction than forward ends of the counter shaft and the intermediate shaft, wherein a rear end of the output shaft extends further in a rearward direction than rear ends of the counter shaft and the intermediate shaft. 11. The power unit according to claim 10, wherein said gear selecting and fixing device is a manually operated dog clutch. 12. The power unit according to claim 10, wherein said forward and reverse drive gears, said first and second intermediate gears, and said output shaft driven gear are constant-mesh gears. 13. The power unit according to claim 10, further comprising: a first speed hydraulic multi-plate clutch; a second speed hydraulic multi-plate clutch; and a third speed hydraulic multi-plate clutch. 14. The power unit according to claim 10, wherein the gear selecting and fixing device selectively fixes said forward drive gear and said reverse drive gear directly to the countershaft. 15. The power unit according to claim 10, wherein the counter shaft is in a position that is below a main shaft and above the output shaft in a vertical direction of the transmission. 16. A transmission comprising: a main shaft; an output shaft; a countershaft extending parallel to said output shaft and the main shaft, the counter shaft being in a position that is below the main shaft and above the output shaft in a vertical direction of the transmission; an intermediate shaft extending parallel to said output shaft; a forward drive gear being rotatably supported relative to said countershaft; a reverse drive gear being rotatably supported relative to said countershaft; a first intermediate gear being rotatably supported relative to said intermediate shaft, said first intermediate gear meshing with said reverse drive gear; a second intermediate gear rotatably supported relative to said intermediate shaft, said second intermediate gear being interlocked with said first intermediate gear to rotate therewith; an output shaft driven gear fixed to said output shaft, said output shaft driven gear meshing with said forward drive gear and said second intermediate gear; and a gear selecting and fixing device axially and movably mounted on said countershaft for selectively engaging said forward drive gear and said reverse drive gear to said countershaft, wherein said gear selecting and fixing device is a manually operated dog clutch. 17. The transmission according to claim 16, wherein the gear selecting and fixing device selectively fixes said forward drive gear and said reverse drive gear directly to the countershaft. 18. The transmission according to claim 16, wherein a forward end of the output shaft extends further in a forward direction than forward ends of the counter shaft and the intermediate shaft.
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