Drive switching mechanism of utility vehicle
A drive switching mechanism of a utility vehicle includes: a two-wheel drive and four-wheel drive switching device that switches between two-wheel drive and four-wheel drive of the utility vehicle; and a control unit that controls the drive switching mechanism. The two-wheel drive and four-wheel drive switching device switches between two-wheel drive and four-wheel drive by using a first clutch. The control unit permits the two-wheel drive and four-wheel drive switching device to switch from two-wheel drive to four-wheel drive when a rotation difference of the first clutch becomes equal to or smaller than a predetermined value.
1. A drive switching mechanism of a utility vehicle, the drive switching mechanism comprising:
a two-wheel drive and four-wheel drive switching device that switches between two-wheel drive and four-wheel drive of the utility vehicle; and
a control unit that controls the drive switching mechanism, wherein:
the two-wheel drive and four-wheel drive switching device switches between two-wheel drive and four-wheel drive by using a first clutch;
the control unit permits the two-wheel drive and four-wheel drive switching device to switch from two-wheel drive to four-wheel drive when a rotation difference of the first clutch becomes equal to or smaller than a predetermined value;
the two-wheel drive and four-wheel drive switching device fixes a propeller shaft to an input pinion of a final reduction device; and
the control unit calculates the rotation difference of the first clutch by using a vehicle speed sensor that detects rotation of a gear included in a transmission and rotating with the propeller shaft, and a ring gear rotation sensor that detects rotation of a ring gear rotating with the input pinion.
2. The drive switching mechanism according to claim 1 , wherein the control unit instantaneously increases or decreases an output of an engine of the utility vehicle when the first clutch is disconnected.
3. A drive switching mechanism of a utility vehicle, the drive switching mechanism comprising:
a drive switching device that switches a drive condition of the utility vehicle by a clutch; and
a control unit that controls the drive switching mechanism, wherein:
the drive switching device switches a plurality of drive conditions by using the clutch;
the control unit permits the drive switching device to switch a drive condition when a rotation difference of the clutch becomes equal to or smaller than a predetermined value;
the drive switching device fixes a propeller shaft to an input pinion of a final reduction device; and
the control unit calculates the rotation difference of the clutch by using a vehicle speed sensor that detects rotation of a gear included in a transmission and rotating with the propeller shaft, and a ring gear rotation sensor that detects rotation of a ring gear rotating with the input pinion.
4. The drive switching mechanism according to claim 3 , wherein the control unit instantaneously increases or decreases an output of an engine of the utility vehicle when the clutch is disconnected.
5. The drive switching mechanism according to claim 3 , wherein the drive switching device is provided at a front end of a front wheel propeller shaft.
6. The drive switching mechanism according to claim 3 , wherein the drive switching device is provided inside a case of a final reduction device.
7. The drive switching mechanism according to claim 3 , wherein the drive switching mechanism includes a plurality of the drive switching devices and all the drive switching devices are operated to change a drive condition by the same motor actuator.