| 摘要 |
933,624. Positive clutches; reversing gearing. CLARK EQUIPMENT CO. June 5, 1962 [June 19, 1961], No. 21606/62. Class 80 (2). A positive clutch selectively connecting either of two gears to an intermediate collar member has synchronizing means operable when shifting from one gear to the other and inoperable when shifting from intermediate neutral to either gear. In a reversing gear in which a driving shaft 12 drives a driven shaft 32 through gears 26, 30 or 28, an idler (not shown) 34 for forward and reverse drive, the gears 26, 28 are clutchable to the splined sleeve 42, rigid with the shaft 12, by a sliding dog clutch member 38. A flange 39 formed on the clutch member 38 has apertures 50 for the reception of shouldered pins 52 rigid with conical surfaced friction clutch members 55, 56, and for the reception of split pins 64, 66 endwise engaged with the friction members 55, 56 and urged apart radially by springs 68. The split pins, which are of semicircular section, have shoulders 69, 70 respectively offset to the centre of the pins. When shifting from the neutral position shown to either gear the clutch member flange 39 may slide freely without contacting the shoulders on the split pins and thus the synchronizer clutch members 55, 58 or 56, 60 are not engaged. Shift from one gear to the other, e.g. from gear 26 to 28, entails the engagement of the flange 39 with the shoulder 69, thereby moving the friction ring 56 into engagement with the clutch member 60 rigid with the gear 28. Relative rotation of the gear 28 to the shaft 12 due to lack of synchronism moves the flange 39 relative to the pin 52 such that the aperture 50 contacts the reduced diameter portion of the pin baulking further axial movement of the flange 39 until synchronism is achieved by clutch 56, 60 and the large diameter of the pin 54 may pass through the aperture 50, thus allowing full axial travel of the clutch member 39 to engage teeth 48 on the gear 28. U.S.A. Specification 2,667,955 is referred to. |
