TRANSFER FOR FOUR-WHEEL DRIVE VEHICLE

摘要

A transfer for a four-wheel drive vehicle includes an input shaft, an output shaft, a high-low switching mechanism, an output member, a clutch, a locking sleeve, a screw mechanism, a transmitting mechanism, a drum cam, and a switching mechanism. The switching mechanism is configured to selectively switch between an H4L position and an L4L position in conjunction with rotational motion of the electric motor. The H4L position is a position in which a high-low sleeve provided in the high-low switching mechanism is in a position in which a high-speed gear is established in the high-low switching mechanism. The L4L position is a position in which the high-low sleeve provided in the high-low switching mechanism is in a position in which a low-speed gear is established in the high-low switching mechanism.

主权项

1. A transfer for a four-wheel drive vehicle, the transfer comprising:
an input shaft; an output shaft having a common axis with the input shaft; a high-low switching mechanism configured to change a rate of rotation input from the input shaft and transmit the resultant rotation to the output shaft by a motion of a high-low sleeve in an axial direction of the out-put shaft, the high low switching mechanism being connected to the input shaft; an output member configured to output power to a second output destination that is different from a first output destination of the output shaft; a clutch configured to adjust and transmit some of the power from the output shaft to the output member; a locking sleeve configured to move in the axial direction of the output shaft, the locking sleeve supported by the output shaft in a manner so that the locking sleeve is unable to rotate around the axis of the output shaft relative to the output shaft, the locking sleeve configured to selectively engage with the output member so that the output shaft and the output member lock together; a screw mechanism that includes a threaded shaft member, a nut member, and an electric motor, the threaded shaft member and the nut member being supported by the output shaft and being screwed together, the electric motor configured to rotatably drive one of the threaded shaft member and the nut member so that the nut member moves linearly in the axial direction of the output shaft; a transmitting mechanism configured to transmit the linear motion of the nut member to the clutch; a drum cam configured to convert a rotational motion of the electric motor into a linear motion in the axial direction of the out-put shaft; and a switching mechanism configured to selectively switch the high-low sleeve and the locking sleeve between an H4L position and an L4L position, by transmitting the linear motion converted by the drum cam to the high low-sleeve and the locking sleeve via a high-low shift fork and a 4WD locking fork respectively, in conjunction with rotational motion of the electric motor, the H4L position being (i) a position in which the high-low sleeve provided in the high-low switching mechanism is in a position in which a high-speed gear is established in the high-low switching mechanism, and (ii) the locking sleeve is in a position in which the output shaft and the output member are locked together, the L4L position being (1) a position in which the high-low sleeve provided in the high-low switching mechanism is in a position in which a low-speed gear is established in the high-low switching mechanism, and (2) the locking sleeve is in the position in which the output shaft and the output member are locked together.