JPH0417371Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a heater unit for a vehicle that blows out conditioned air into a vehicle interior in various blowing modes.

(Prior art) Conventionally, heater units of vehicle air conditioners include:
Each mode door that adjusts the amount of air flow from each outlet such as a vent outlet, a heater outlet, and a defroster outlet, and a lever device that controls opening and closing of these mode doors are provided. This lever device has a drive lever that rotates via a wire cable and engages with each cam groove provided on this drive lever when the mode selection lever on the instrument panel is operated, thereby operating the relay lever and rod. Each mode door (ie, vent door, heat door, defroster door) is driven through each pin.

The cam groove is made up of an operating region that operates each mode door within a predetermined range from a certain position to a closed position, an intermediate position, and a fully open position, and a curved section that does not operate each mode door in each of the above positions. It has a dead zone area and is configured by continuously combining both areas, and a curved part is formed at the boundary between the operating area and the dead zone area. As the drive lever rotates, each mode door is driven in the operating area of each cam groove via each pin and the relay lever and rod that interlock with this, thereby changing the mode of blowing into the car from vent to air. mode, bi-level mode (B/L), heat mode,
Switching control is performed between the differential heat mode (D/H) and the differential mode, and the operation of each mode door is locked in the dead zone region.

The dead zone region is provided to absorb hysteresis at various locations on the lever device to prevent adverse effects, and to ensure that each mode door is locked at the holding position.

The mode operation of each mode door can be shown as a histogram as shown in FIG. In the figure, solid line A indicates the heat door, broken line B indicates the vent door, and dashed line C indicates the operation of the defroster door.
Each horizontal portion n represents a dead zone region corresponding to a curved portion of the cam groove, and the inclined portion represents an operating region. Additionally, in the past, cam grooves were formed in multiple mode doors so that the respective inflection portions overlapped.
In particular, at inflection point a in the figure, the closed heat door overlaps with the open vent door, and at each inflection point b, c, and d, cam grooves are formed so that one side overlaps with the closed mode door. It has a structure.

(Problem to be solved by the invention) However, in the conventional heater unit described above, the curved portions of each cam groove were provided so as to overlap, so a large operating force was required to drive multiple mode doors. It was hot. In particular, as shown at points a, b, c, and d in Figure 4, among the multiple mode doors, when one mode door is seated (closed) and when the other mode door changes the opening If they overlap, more operating force is required due to changes in the curvature of the cam grooves and the influence of wind pressure, resulting in a problem that lever operation becomes heavy.

Therefore, an object of the present invention is to provide a heater unit for a vehicle that reduces operating force while securing seats for each mode door.

(Means for Solving the Problems) In the heater unit of the present invention, a drive lever that is rotated by the operation of the mode switching lever connected to the mode switching lever via a wire is attached to the unit case, and each of the drive levers is attached to the drive lever. A cam groove corresponding to the mode door is provided, a pin for driving each mode door is slidably engaged with the cam groove, and each cam groove is defined as an operating area for operating each door, and a pin for driving each mode door is provided in the cam groove. A heater unit for a vehicle is constructed by continuously combining a dead zone region in which the cam groove is not exposed to the air through a bending portion, and in which each pin is located in a dead zone region of each of the cam grooves in a predetermined blowing mode. At least one of the mode doors is configured such that the inflection part of the cam groove that starts the operation in the opening direction from the closed state is provided at a position that does not coincide with the inflection part of the other cam grooves. .

(Function) Unlike conventional models in which the curved portions of multiple cam grooves overlap in the closed position of the mode door, in the case of the present invention, the position of the curved portion of one cam groove is changed to the position of the curved portion of the other cam grooves. Since it is located in a position that does not match the
In other words, since it is formed by shifting the inflection part,
The operation of multiple mode doors will be performed with a time lag, and especially in the closed position of the mode door, in addition to changes in the curvature of the cam groove, it will no longer be affected by wind pressure at the same time, and the operation will be uniform. It is possible to operate a plurality of doors with an operating force, and it is also possible to ensure good seating properties for each mode door.

(Example) An example of the present invention will be described below based on the drawings.

FIG. 1 is a front view showing the lever device inside the heater unit, and numeral 1 in the figure indicates the heater unit.

The heater unit 1 has a heater core (not shown) housed inside a unit case 2, and adjusts the air temperature by appropriately controlling the flow of air passing through the heater core. , a heat door 6 is provided at the heater outlet 5,
Defroster door 8 (hereinafter referred to as
(referred to as a differential door and a differential air outlet) are respectively provided and are moved as appropriate to control the blowout mode of the conditioned air. On the side surface of the unit case 2, there are the mode door 4,
A lever device 10 for controlling 6, 8 is attached.

This lever device 10 includes three relay levers 1
1, 12, 13 and these relay levers 11, 1
2 and 13 and a drive lever 16 connected to the drive lever 16. Each relay lever 11, 12, 13 is connected to the unit case 2 by a screw 15 via a bush 14.
It is rotatably supported by the drive lever 1.
6 is rotatably provided in the unit case 2 by a shaft 17 so as to cover the relay levers 11, 12, and 13.

A wire cable 20 is attached to one edge of the drive lever 16 via a pin 19.
An outer side 21 of the wire cable 20 is supported by a cable clip 22 fixed to the heater case 2, and the other end of the wire cable 20 is connected to a mode selection lever on an instrument panel. Then, the drive lever 10 is rotated about the shaft 17 as a fulcrum through the forward and backward movement of the wire cable 20 by operating the mode selection lever.

Further, the drive lever 16 has three cam grooves 23, 24, and 25 each having a predetermined shape and opening at the bottom along its periphery. Each of these cam grooves 23, 24, 25 has pins 11A, 12 protruding from the relay levers 11, 12, 13.
A and 13A are engaged. Relay lever 11,
12 and 13 are arm parts 11a and 12, respectively.
a, 13a are formed, and this arm portion 11a,
A rod 27 and a swinging piece 2 are attached to 12a and 13a, respectively.
A vent door 4, a heat door 6, and a differential door 8 are connected via 8, respectively.

Each pin 11A, 1 slides into each cam groove 23, 24, 25 as the drive lever 16 rotates.
2A, 13A are displaced, thereby each relay lever 11, 12, 13 rotates, and each mode door 4, 6, 8 is opened via each rod 27 and each swinging piece 28.
However, as shown in the histogram in Figure 3, there is a vent mode (VENT), a bi-level mode (B/L),
Opening/closing control is performed corresponding to each blowing mode: heat mode (HEAT), differential heat mode (D/H), and differential mode (DFF). In Fig. 3, solid line A indicates the heat door, broken line B indicates the vent door, and dashed line C indicates the differential door.
indicates the dead zone area, and the other shaded area indicates the operating area.

In each of the cam grooves 23, 24, 25, the dead zone areas n, N and the operating area S are constructed by continuously combining them, an example of which is shown in FIG. An inflection portion t is formed at each.

Further, in this embodiment, the plurality of cam grooves 23, 2
At the point where the inflection parts t of Nos. 4 and 25 overlap, the line is changed from the broken line in Fig. 2 to the solid line so that at least the inflection part of one of the cam grooves that is in the closed state is shifted, that is, so that these inflection parts do not coincide. As shown in the figure, the dead zone region of the cam groove that is in the closed state is formed to be longer from n to N.

Specifically, for example, in the vent mode, as shown in FIG. 3, the vent door 4 is in the fully open position and the heat door 6 is in the closed position, and the inflection part of both overlaps with point a. Especially when the heat door 6 is in the closed position,
The activation start point of the heat door 6 is shifted by expanding the dead zone area N from point a to point a'. This is because the dead zone area of the cam groove in the closed state is expanded because it is greatly affected by wind pressure, especially in the closed state, and points b′, c′,
Similarly, at point d', the dead zone area of the cam groove in the closed state is expanded to N. In addition, even when the door opening degree is in the intermediate range and the inflection parts overlap each other, it is possible to widen the dead zone area by not making the inflection parts coincide, that is, by shifting the inflection parts, but in this case, the wind pressure Since the effect of

Therefore, in this embodiment, when the inflection parts of the cam grooves overlap, the dead zone area is expanded by providing one inflection part at a position that does not coincide with the other inflection part, that is, by shifting these parts. As a result, even when one mode door is in the closed state, which is particularly affected by wind pressure, only a small operating force is required to switch the mode, and the switching operation becomes easy. Also,
By widening the dead zone area of the cam groove in the closed state, even if a hiss that exceeds the assembly hysteresis expected in the design occurs, it can be absorbed by the expanded dead zone area, thereby preventing problems such as seat defects in the mode door. can be prevented and the degree of freedom in design can be increased.

(Effects of the invention) As explained above, according to the invention, among the plurality of cam grooves whose inflection parts overlap with each other, at least in the closed position of the mode door, the inflection part of the dead zone area of one cam groove overlaps with the other. Because the position does not match with other inflection parts, that is, by shifting them, the operation of multiple mode doors is operated with a time lag, so especially in the closed position of the mode door, the cam groove It is not affected by curvature changes or wind pressure at the same time, and the operating force required for mode switching can be reduced, making the switching operation easier. In addition, by shifting the curved part of the cam groove, the dead zone area of the cam groove is expanded, so even if the hiss during assembly becomes larger than the design, it will be absorbed by the dead zone area, and the mode door Door seat performance can be ensured without the occurrence of defects resulting in seat defects.

[Brief explanation of drawings]

1 to 3 relate to one embodiment of the present invention, in which FIG. 1 is a front view showing a lever device in the heater unit, FIG. 2 is an explanatory diagram of the cam groove, and FIG. 3 is a histogram of the blowout mode. , FIG. 4 is a histogram of the conventional blowout mode. 1... Heater unit, 2... Unit case, 12A, 13A, 14A... Pin, 16...
Drive lever, 20...Wire, 23, 24, 25
...Cam groove, S... Operating area of each cam groove, n, N
...Dead zone area of each cam groove, t...Inflection portion of each cam groove.

Claims (1)

[Claims for Utility Model Registration] A drive lever that is connected to the mode switching lever via a wire and rotates when the mode switching lever is operated is attached to the unit case, and the drive lever is provided with a cam groove corresponding to each mode door. , a pin that drives each mode door is slidably engaged in the cam groove, and each cam groove has an inflection portion that defines an operating area where each door is actuated and a dead zone area where each door is not actuated. The heater unit for a vehicle is configured such that each of the pins is located in a dead zone region of each of the cam grooves in a predetermined blowout mode, the heater unit being configured such that each pin is located in a dead zone area of each of the cam grooves during a predetermined blowout mode, the heater unit having at least one of the mode doors. A vehicle heater unit is characterized in that the curved portion of the cam groove that starts operation in the opening direction from the closed state is provided at a position that does not coincide with the curved portions of other cam grooves.