초록 ▼

An electric vehicle in which driving force of a motor driven by batteries is transmitted through a reduction device and a differential to front wheels. The motor and the reduction device are disposed at portions of a vehicle body rearwardly of the differential and hence, a portion of the vehicle bod

An electric vehicle in which driving force of a motor driven by batteries is transmitted through a reduction device and a differential to front wheels. The motor and the reduction device are disposed at portions of a vehicle body rearwardly of the differential and hence, a portion of the vehicle body in front of the differential is enlarged and can effectively function as a crushable zone upon a frontal collision of a vehicle. Moreover, the motor and the reduction device which are heavy components are disposed near a central portion of the vehicle body, leading to a mid-ship layout. This conrtibutes to an enhancement in motional property of the vehicle.

대표청구항 ▼

An electric vehicle in which driving force of a motor driven by batteries is transmitted through a reduction device and a differential to front wheels. The motor and the reduction device are disposed at portions of a vehicle body rearwardly of the differential and hence, a portion of the vehicle bod

An electric vehicle in which driving force of a motor driven by batteries is transmitted through a reduction device and a differential to front wheels. The motor and the reduction device are disposed at portions of a vehicle body rearwardly of the differential and hence, a portion of the vehicle body in front of the differential is enlarged and can effectively function as a crushable zone upon a frontal collision of a vehicle. Moreover, the motor and the reduction device which are heavy components are disposed near a central portion of the vehicle body, leading to a mid-ship layout. This conrtibutes to an enhancement in motional property of the vehicle. t least one of the ring portions being adapted to face the sealing sleeve, the plurality of discrete arcuate segments comprising a first set of discrete arcuate segments that forms the first ring portion and a second set of discrete arcuate segments that forms the second ring portion, the first and second sets of arcuate segments being circumferentially offset, each arcuate segment of the first set comprises one of a guide pin and a slot and each arcuate segment of the second set comprises the other of the guide pin and the slot, the slot including an end stop, each guide pin extends into the elongate slot of a first offset segment such that movement of the first and second sets of arcuate segments toward the expanded position causes each guide pin to ride in its respective slot and contact the end stop to thereby arrest further movement of the segments toward the expanded position and control the size of each gap; wherein the first ring portion is circumferentially offset from the second ring portion such that at least one of the first and second ring portions extends across the gaps during movement of the segments toward the expanded position to thereby prevent extrusion of the sealing sleeve through the gaps. 9. An anti-extrusion ring according to claim 8, wherein each arcuate segment of one of the first and second sets is securely connected to a second offset segment adjacent the first offset segment of the other of the first and second sets. 10. An anti-extrusion ring according to claim 9, wherein one of the first and second ring portions comprises an annular groove and the other of the first and second ring portions comprises an annular tongue that is received in the annular groove. 11. A downhole packer assembly for use in a well bore, the downhole packer assembly comprising: an elongate mandrel adapted for positioning in the well bore; an expander adapted for sliding movement along the mandrel; a sealing sleeve disposed around the mandrel for engaging the well bore; and at least one anti-extrusion ring disposed between the expander and the sealing sleeve, the at least one anti-extrusion ring comprising: first and second ring portions divided into a plurality of discrete arcuate segments for movement between a retracted position wherein each segment is in contact with adjacent segments, and an expanded position wherein gaps are formed between the segments, with one of the ring portions contacting the sealing sleeve, an elongate slot associated with each of the segments, the elongate slot having an end stop; and a guide pin extending from each of the segments and into the elongate slot of another segment, such that movement of the segments toward the expanded position causes each guide pin to ride in its respective slot and contact the end stop to thereby arrest further movement of the segments toward the expanded position and control the size of each gap, wherein the first ring portion is circumferentially offset from the second ring portion such that at least one of the first and second ring portions extends across the gaps during movement of the segments toward the expanded position to thereby prevent extrusion of the sealing sleeve through the gaps. 12. A downhole packer assembly according to claim 11, wherein the first and second ring portions are integrally formed together. 13. A downhole packer assembly according to claim 12, wherein each segment comprises: an elongate slot associated with one of the first and second ring portions, the elongate slot having an end stop; and a guide pin extending from the other of the first and second ring portions and into the elongate slot of an adjacent segment, such that movement of the segments toward the expanded position causes each guide pin to ride in its respective slot and contact the end stop to thereby arrest further movement of the segments toward the expanded position and control the size of each gap. 14. A downhole packer assembly according to c