JP4092803B2 - Door drive device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a door drive device used for a vehicle air conditioner.
[0002]
[Prior art]
The vehicle air conditioner includes an inside / outside air switching door, an air mix door, a mode switching door, and the like.
When the vehicle air conditioner is a manual type, these plate-like doors are driven by an operation unit such as a lever provided on the instrument panel.
As a link mechanism between the operation unit and the plate-like door, there is a direct drive by a cable in which one end is connected to a lever and the other end is connected to a door shaft of the plate-like door, a drive by a pin and a cam groove, or a gear drive. It has been put into practical use.
[0003]
[Problems to be solved by the invention]
These have the effect of converting the operating force of the operating part on the drive side into the force to rotate the plate door on the driven side, but the weight of the plate door, the sliding resistance, and the wind pressure received by the plate door. A phenomenon in which force is transmitted in the opposite direction also occurs.
[0004]
For this reason, fluctuations occur in the operating force for operating the operation unit, resulting in a deterioration in operation feeling. In addition, since a mechanism for making the operation unit difficult to move and a mechanism for suppressing the repulsive force on the door side are required on the drive side, there is a problem that the operation force of the operation unit increases.
An object of the present invention is to provide a door drive device that prevents transmission of force from the door side to the operation unit side due to the weight of the plate-like door, the wind pressure applied to the door, or the like.
[0008]
[Means for Solving the Problems]
[About claim 1 ]
The cable has one end connected to a lever and the other end engaged with a hook.
When a lever provided on the air conditioning operation panel is operated, the hook is moved by the cable and the plate is rotated around the fulcrum.
Since the bevel gear is engaged with the spur gear formed on the outer edge, the shaft rotates about the axis and the worm gear also rotates.
Since the gear meshing with the worm gear is formed on the outer periphery, the worm wheel rotates.
Since the worm wheel is integrally attached to the door shaft, the door shaft rotates and the plate door rotates.
Further, the spur gear is formed on the plate so that the characteristic curve between the lever stroke and the door position is convex, so that the temperature setting scale is equally spaced.
[0009]
Since the worm gear and the gear are engaged with each other, force is transmitted from the shaft side to the worm wheel side, but no force is transmitted from the worm wheel side to the shaft side.
As a result, the shaft does not rotate and the lever does not move even if force is applied to the worm wheel due to the dead weight of the door, sliding resistance, wind pressure received by the door, or the like.
Further, since it is not necessary to provide a mechanism for making the lever difficult to operate or a mechanism for suppressing the repulsive force on the door side on the lever side, the plate-like door can be operated with a relatively weak force.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A reference example of the present invention will be described with reference to FIGS.
As shown in FIG. 2, an automotive air conditioner 100 employing the door drive device A of the present invention includes an inside / outside air switching box 1, a scroll casing 2 provided on the downstream side of the inside / outside air switching box 1, and a scroll casing 2. An air conditioning unit 3 provided on the downstream side, an evaporator 31, a heater core 32, and an air mix door 4 disposed in the air conditioning unit 3, a differential duct 51, a foot duct 52 connected to the downstream side of the air conditioning unit 3, and A face duct 53 and air outlet switching doors 61, 62, 63 disposed at the inlets of the ducts are provided.
[0012]
The inside / outside air switching box 1 includes an inside air introduction port 12 for introducing the inside air 120, an outside air introduction port 13 for introducing the outside air 130, and an inside / outside air switching door 11 that switches between the inside air 120 and the outside air 130.
[0013]
The scroll casing 2 is arranged so as to face the outlet of the inside / outside air switching box 1 and is provided with a blower 21.
The blower 21 includes a centrifugal fan 211 and a blower motor 212 that drives the centrifugal fan 211, and the centrifugal fan 211 rotates at a rotational speed corresponding to the amount of current supplied to the blower motor 212.
[0014]
The air conditioning unit 3 is connected to the downstream side of the scroll casing 2 and includes an evaporator 31 for cooling the introduced air and a heater core 32 for heating.
[0015]
The evaporator 31 is a heat exchanger that constitutes a refrigeration cycle that is piped together with a refrigerant compressor, a refrigerant condenser, a receiver, and a decompressor (all not shown), and blocks the ventilation path of the air conditioning unit 3. It is arranged.
[0016]
The refrigerant compressor is driven by the engine and compresses the refrigerant. The refrigerant condenser condenses and liquefies the high-temperature and high-pressure refrigerant compressed by the refrigerant compressor by receiving air from the cooling fan. The receiver temporarily stores the refrigerant condensed by the refrigerant condenser and allows only the liquid refrigerant to flow. The decompressor decompresses and expands the liquid refrigerant guided by the receiver.
The evaporator 31 evaporates the low-temperature and low-pressure refrigerant decompressed by the decompressor by receiving the air from the blower 21 and cools the introduced air.
[0017]
The heater core 32 disposed on the downstream side of the evaporator 31 is a heat exchanger that uses engine cooling water as a heat source, and heats the cooled air that has passed through the evaporator 31.
A bypass passage 33 that bypasses the heater core 32 is provided in the air conditioning unit 3 in the vicinity of the heater core 32. And the air mix door 4 for operating the ratio of the air which passes the bypass path 33 and the heater core 32 is arrange | positioned.
[0018]
The differential duct 51 communicates with a differential outlet 511 for blowing conditioned air to the windshield.
The foot duct 52 communicates with a foot outlet 521 for blowing out conditioned air to the feet of the passenger.
The face duct 53 communicates with a center face air outlet 532 and side face air outlets 531 and 533 for blowing air-conditioned air substantially from the front of the instrument panel and obliquely from the instrument panel to the front seat occupant's face position.
[0019]
At the duct inlets of the differential duct 51, the foot duct 52, and the face duct 53, outlet switching doors 61, 62, and 63 for opening and closing each duct inlet and switching the outlet mode are disposed.
The outlet switching doors 61, 62, 63 are connected to an outlet switching lever (none of which is shown) provided on the air conditioning operation panel by a link mechanism.
[0020]
The air mix door 4 includes a door shaft 41 having both ends pivotally attached to a substantially central side wall of the air conditioning unit 3, and a plate-shaped door body 42 having a base end fixed to the door shaft 41. It is operated by operating the operation lever 40 provided in the upper and lower parts, and rotates up and down around the door shaft 41 between the upper position and the lower position of the two-dot chain line in the figure. The door main body 42 includes a core plate (plastic, iron, etc.) and a cushion material attached to both surfaces of the core plate.
[0021]
One end of the door shaft 41 penetrates the wall surface of the air conditioning unit 3 and protrudes to the outside in front of the drawing, and the U-shaped portion 431 of the worm wheel 43 is connected to the protruding portion.
In the worm wheel 43 (made of plastic), a hole 432 of a U-shaped portion 431 is fitted into the door shaft 41, and a gear 434 that meshes with the worm gear 441 is formed on the outer periphery of the fan-shaped portion 433.
[0022]
44 is a shaft (plastic, iron, etc.), a worm gear 441 is formed in the lower part of the figure, and a bevel gear 442 is formed in the upper part of the figure. The shaft 44 is supported by support members 443 and 444 attached to the outer wall of the air conditioning unit 3 so as to be rotatable about the axis.
[0023]
45 is a plate (made of plastic), the hole 452 of the U-shaped portion 451 is fitted into the rod-shaped body 301 protruding from the outer wall of the air conditioning unit 3, and a spur gear 450 meshing with the bevel gear 442 is formed on the outer edge, A hook 453 is formed on the back surface (the front surface in the figure) and can be rotated around the rod-shaped body 301.
[0024]
Reference numeral 40 denotes a temperature control operation lever provided on the air conditioning operation panel. 47 is a cable having one end connected to the lever 46 and the other end engaged with the hook 453.
[0025]
Next, the operation of the air mix door 4 will be described.
Since the automotive air conditioner 100 of this reference example is a manual type, the vehicle room temperature is adjusted by sliding the operation lever 40 to the left and right.
For example, if the user wants to raise the vehicle room temperature and the user manually operates the operation lever 40 to the right from the center position, the cable 47 is pulled, the hook 453 moves to the left in the figure, and the plate 45 is centered on the rod-shaped body 301. Rotate clockwise.
[0026]
Since the spur gear 450 of the plate 45 meshes with the bevel gear 442, the shaft 44 rotates about the axis and the worm gear 441 also rotates.
Since the gear 434 that meshes with the worm gear 441 is formed on the outer periphery, the worm wheel 43 rotates counterclockwise.
[0027]
Since the hole 432 of the U-shaped portion 431 is fitted into the door shaft 41 and the worm wheel 43 is integrally attached to the door shaft 41, the door shaft 41 rotates counterclockwise, and the air mix door 4 Rotate downward.
When the air mix door 4 rotates downward, the amount of air passing through the heater core 32 increases, so that the temperature of the air blown from each outlet increases and the vehicle room temperature increases.
[0028]
If the user wants to lower the vehicle room temperature and the user manually operates the operation lever 40 leftward from the center position, the cable 47 is pushed out and the hook 453 moves rightward in the figure, and the plate 45 is centered on the rod-shaped body 301. Turn counterclockwise.
[0029]
As a result, the shaft 44 rotates about the axis, the worm gear 441 also rotates, and the worm wheel 43 rotates clockwise.
Then, the door shaft 41 rotates clockwise, and the air mix door 4 rotates upward.
When the air mix door 4 rotates upward, the amount of air passing through the heater core 32 decreases, so the temperature of the air blown out from each outlet decreases and the vehicle room temperature decreases.
[0030]
When the temperature control operation lever 40 is operated to the center, the air mix door 4 is positioned horizontally (solid line in FIGS. 1 and 2), and when operated to the right end (Max Hot), the air mix door 4 is positioned obliquely downward. The size of the bevel gear 442 and the plate 45 is set so that the air mix door 4 is positioned obliquely upward (state of FIG. 4) when operated to the left end (Max Cool) (state of FIG. 3).
[0031]
The door drive device A of this reference example has the following advantages.
[A] Since the worm gear 441 of the shaft 44 and the gear 434 of the worm wheel 43 are engaged with each other, force is transmitted from the shaft 44 side to the worm wheel 43 side, but force is transmitted from the worm wheel 43 side to the shaft 44 side. Is hardly transmitted.
[0032]
For this reason, when the air mix door 4 is located at a position other than the Max Hot position (position shown in FIG. 3), the shaft 44 does not rotate and the operation lever 40 does not move even if the door's own weight works downward.
Further, when the air mix door 4 is positioned at a rotation position where a large wind pressure is applied (position of FIG. 5), the shaft 44 does not rotate and the operation lever 40 does not move even if the wind pressure is applied to the air mix door 4.
[0033]
[A] Since it is not necessary to provide a mechanism for making the operation lever 40 difficult to operate and a mechanism for suppressing the repulsive force from the air mix door 4 side on the operation lever 40 side, the air mix door can be operated with a relatively flat force. 4 can be operated.
[0034]
Next, a first embodiment of the present invention FIG. 6, described with reference to FIG. In the present embodiment, the radius of the plate 45 is set to be shorter on the MAX Hot side and longer toward the MAX Cool side, and the spur gear 450 is formed on the outer edge of the plate 45 (see FIG. 6). Thereby, the characteristic curve of the stroke of the lever and the door position can be changed from linear (solid line) to upward convex (dashed line). By making the characteristic curve convex upward, the temperature setting scale can be equally spaced, and it is easy to use.
[0035]
The present invention includes the following embodiments in addition to the above embodiments.
a. In the above embodiment, the door driving device is applied to the air mix door 4, but may be applied to the inside / outside air switching door 11.
Moreover, although a door drive device may be applied to the outlet switching doors 61, 62, and 63, three sets of door drive devices are required.
[0036]
b. A stopper may be provided at the rotating end of the worm wheel 43 or the plate 45 to limit the range in which the air mix door 4 rotates.
[Brief description of the drawings]
FIG. 1 is an enlarged view of a main part of a door drive device according to a reference example of the present invention.
FIG. 2 is a structural explanatory diagram of an automotive air conditioner that employs a door drive device according to a reference example of the present invention.
FIG. 3 is an enlarged view of a main part of the door driving device showing a state where the air mix door is set to a MAX Hot position in the reference example of the present invention.
FIG. 4 is an enlarged view of a main part of the door driving device showing a state where the air mix door is set to a MAX Cool position in the reference example of the present invention.
FIG. 5 is an enlarged view of a main part of the door driving device showing a state in which the air mix door is positioned close to the MAX Hot position in the reference example of the present invention.
FIG. 6 is an enlarged view of a main part of the door drive device showing a state in which the air mix door is set to a position close to the center position in the first embodiment of the present invention.
FIG. 7 is a graph showing a stroke-door position characteristic of a lever in the first embodiment of the present invention.
[Explanation of symbols]
A Door drive device 3 Air conditioning unit 4 Air mix door (plate door)
40 Operation lever (door operation part)
41 Door shaft 43 Worm wheel 44 Shaft 45 Plate (link mechanism)
47 Cable (link mechanism)
434 Gear 441 Worm gear 442 Bevel gear (link mechanism)
450 Spur gear (link mechanism)
453 hook

Claims (1)

A plate-like door pivotally mounted at a predetermined position in the air-conditioning duct and rotatable about the door axis;
A shaft having a worm gear and a bevel gear and rotatable about an axis;
A gear that meshes with the worm gear is formed on the outer periphery, and a worm wheel integrally attached to the door shaft of the plate door;
And lever for door operation are found provided on the air-conditioning operation panel,
A spur gear that meshes with the bevel gear is formed on the outer edge, a hook is formed on the back surface, and a plate that can rotate around a fulcrum;
A cable having one end coupled to the lever and the other end engaged with the hook;
A door driving device characterized in that a spur gear is formed on the plate so that a characteristic curve between the stroke of the lever and the door position is convex, so that the temperature setting scales are equally spaced .

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