A rotary shaft assembly includes an outer shaft, an outer opening being formed on a circumferential wall of the outer shaft, and a nested shaft which is rotatably supported within the outer shaft, a nested opening being formed on a circumferential wall of the nested shaft. The nested shaft and the outer shaft are configure to be rotatable with respect to each other about a common axis such that a relative rotation angle between the outer shaft and the nested shaft varies.

Disclosed is a vehicle air conditioner capable of increasing the aft flow effective region of an inner flow path by reducing the space occupied by support parts of doors for opening/closing a plurality of regions. The vehicle air conditioner comprises: an air-conditioning case in which an air flow path is formed; and a cooling heat exchanger and a heating heat exchanger provided in the air flow path of the air-conditioning case, wherein the air flow path is partitioned and divided into a plurality of regions, and has a plurality of doors for opening/closing each region and a shaft for driving the doors, and the distance between one door and the shaft is different from the distance between another door and the shaft.

Air-conditioning apparatus for vehicle comprising an air-conditioning case with an inlet portion and a discharge port, and a first partition wall partitioning the inner space thereof into a first space portion and a second space portion; a cooling heat exchanger arranged in the air-conditioning case through the first space portion and the second space portion, and connected to the inlet portion; and a heating heat exchanger arranged in the air-conditioning case through the first space portion and the second space portion, wherein the air-conditioning case comprises a second partition wall which partitions the second space portion into a plurality of space portions, and a first door which is arranged in a third space portion from among the plurality of space portions and disposed behind the heating heat exchanger. The first door adjusts the opening degree of the heating heat exchanger in the third space portion.

An air passage opening and closing device has: a case defining an air passage; and a slide door provided with a door body that has a plate shape, the slide door slidably disposed in the case and opening or closing the air passage. The case is provided with a case-side sealing surface that is in contact with the door body when the slide door is located to close the air passage. The door body is provided with a rib that protrudes toward an upstream side in a flow direction of air and extends in a moving direction of the slide door.

A sliding door has a door main body and door support sections supported by contact with an inner wall of a guide groove. The guide groove has a groove lacking section having a size that the door main body can be inserted therefrom. When a first one of the door support sections that is the closest to a tip end of the sliding door is located within the groove lacking section, another one of the door support sections that is located opposite from the tip end of the sliding door through the groove lacking section satisfies a relational expression of A900.2L, in which A represents a distance from the tip end to an end of the another one of the door support sections on a separated side away from the tip end, and L represents a door width of the door main body.

A link mechanism includes a drive device, a driven member, a first drive force transmission mechanism, a second drive force transmission mechanism and a transmission path switch device. The drive device generates a drive force. The driven member is moved by the drive force. The first drive force transmission mechanism transmits the drive force toward the driven member at a speed reduction ratio which is predetermined. The second drive force transmission mechanism transmits the drive force toward the driven member at a speed reduction ratio which is different from the speed reduction ratio of the first drive force transmission mechanism. The transmission path switch device switches a transmission path, along which the drive force is transmitted from the drive device toward the driven member, to one of the first drive force transmission mechanism and the second drive force transmission mechanism.

An air conditioning unit for a vehicle has a casing, a heating heat exchanger, a first partition plate, a first opening, a second partition plate, a second opening, and a switching door. The casing has a face opening and a foot opening. The heating heat exchanger is arranged in the casing. The first partition plate partitions a downstream side of the heating heat exchanger in an airflow direction into a first passage and a second passage located below the first passage. The first opening is formed on a downstream side of the first partition plate in an airflow direction and communicates between the first passage and the second passage. The second partition plate is arranged on the downstream side of the heating heat exchanger and is formed with a third passage between the first partition plate and the second partition plate in the first passage. The second opening that is located on a downstream side of the second partition plate in an airflow direction and communicates between an upper side and a lower side of the second partition plate. The switching door opens or closes the first and second openings. The air in the third passage is guided toward the foot opening by the second partition plate and the switching door in an air conditioning mode in which the switching door opens the first opening and closes the second opening.

A guide groove is provided on both sides in a door width direction of a plate-like portion of a door. A radius of curvature of the plate-like portion in a single non-mounted state is set more than that of the guide groove, to thereby support both end portions in the door width direction of the plate-like portion respectively at three abutment points P1 to P3. A rib is provided in the plate-like portion to extend from one end portion in the door width direction of the plate-like portion to the other end portion thereof, so that force generated from both end portions in the door width direction of the plate-like portion is transferred to a center portion in the door width direction of the plate-like portion via the rib. Therefore, it can prevent the center portion and vicinity of the plate-like portion from being deformed in the direction away from a seal surface of the air conditioning case.

Disclosed is an air conditioner for a vehicle. The present invention provides an air conditioner for a vehicle capable of introducing indoor air and outdoor air simultaneously or selectively by forming a double-layer flow in an air conditioner case and capable of separately controlling the temperatures of a front seat and a rear seat.

The passage opening and closing device includes a casing in which an opening edge forms an opening of an air passage, and a sliding door slidably movable inside the casing to open and close the opening. A door end part of the sliding door faces a door facing wall of the opening edge when the sliding door is positioned at a closed position where the sliding door closes the opening. A gap flow-path extending in the door moving direction is formed between the door facing wall and the door end part. A distance between the door end part and the door facing wall decreases downstream in air flow in the gap flow-path so that the gap flow-path is a convergent flow path.