JPH074129U - Car door structure - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a stable opening / closing assist force regardless of the outside temperature and door weight. [Structure] The initial position of the end portion of the stay damper 4 is changed by rotating the bracket 9 according to the magnitude of the opening / closing operation force required to open / close the back door 3 to adjust the length of the operating stroke. For example, in the summer when the outside air temperature is high, the viscosity of the oil in the stay damper 4 decreases and the opening / closing operation force decreases, so the length of the operating stroke is increased. On the other hand, in winter when the outside temperature is low, the viscosity of the oil in the stay damper 4 increases and the opening / closing operation force increases,
Make the working stroke length short.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle door structure including a stay damper, one end of which is rotatably connected to a door such as a back door, and the other end of which is rotatably connected to a vehicle body, and which assists a door opening / closing operation.

[0002]

[Prior art]

 For example, as described in Japanese Utility Model Laid-Open No. 2-43715, a structure using a stay damper is known to assist the opening / closing operation of the roof, and a hydraulic cylinder is used as the stay damper.

A structure using a similar stay damper is also used for assisting the opening and closing operation of the back door of a one-box car or a hatchback car, and a hydraulic cylinder is also used as the stay damper. Has been.

[0004]

[Problems to be solved by the device]

 However, as a structural problem of the hydraulic cylinder used as such a stay damper, the opening and closing of the hydraulic cylinder (the stay damper) that expands and contracts in order to open and close the door such as the back door due to changes in the outside air temperature. There is a problem that the assist power changes. That is, in the summer when the outside temperature is high, the temperature of the oil in the hydraulic cylinder rises and its viscosity decreases, and the opening / closing assist force tends to decrease. The temperature of the oil inside decreases, its viscosity increases, and the opening / closing assist force tends to increase.

Further, even when the weight of the back door changes due to mounting of a rear spoiler or the like, there is a similar problem.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a door structure of an automobile capable of stably performing a door opening / closing assist by a stay damper regardless of the outside temperature and the door weight. It is what

[0007]

[Means for Solving the Problems]

 According to the present invention, a door such as a back door is provided so as to be openable and closable with respect to a vehicle body, one end of a stay damper is rotatably connected to the door, and the other end of the stay damper is rotatable with respect to the vehicle body. It is assumed that the vehicle door structure is connected and the door opening / closing operation is assisted by the stay damper.

According to a first aspect of the present invention, one of the two end portions of the stay damper is provided with a varying means for varying the initial position of the end portion.

In the invention of claim 2, the variable means is a bracket whose one end is rotatably connected to the end of the stay damper and the other end is rotatably connected to the door.

[0010]

[Action]

 According to the invention of claim 1, the length of the operation stroke of the stay damper is adjusted so that the opening / closing assist force for opening and closing the door is changed by changing the initial position of the end portion of the stay damper. It For example, in the summer when the outside temperature is high, the viscosity of the oil in the hydraulic cylinder decreases and the opening / closing operation force decreases, so the length of the operating stroke is increased, while in the winter when the outside temperature is low, Since the viscosity of the oil in the hydraulic cylinder increases and the opening / closing operation force increases, the length of the operating stroke should be shortened.

According to the second aspect of the invention, the length of the operation stroke of the stay damper is changed by rotating the bracket. A first position with a long working stroke length and a second position with a short working stroke length can be alternatively taken by rotating the bracket.

[0012]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1 showing a schematic structure, 1 is an automobile, and a back door 3 is provided at an upper edge portion of a rear portion of a vehicle body 2 via hinge means (not shown) so that the back door 3 can be opened and closed. The stay dampers 4 and 4 that assist the opening and closing operation of the back door 3 are interposed between the back door 3 and the back door 3.

As shown in FIG. 2, the stay damper 4 has a damper main body portion 4a and a variable rod 4b slidably accommodated in the damper main body portion 4a. A mounting bracket 5 is provided at the lower end of 4a, and a ball joint receiver 6 including a ball portion 6a and a receiver 6b is provided at the tip of the variable rod 4b.

The mounting bracket 5 is mounted and fixed to the mounting portion provided on the vehicle body side by the bolt 7 and the nut 8. Further, on each side of the back door 3, as shown in detail in FIG. 3, the threaded portion 6 c of the ball portion 6 a of the joint tool 6 at the tip of the variable rod 4 b of the stay damper 4 is screwed into the central portion of the bracket 9. Both ends of the bracket 9 are rotatably connected to the back door 3 via mounting bolts 10a and 10b. Then, one mounting bolt 10a is removed, the bracket 9 is rotated 180 degrees about the other mounting bolt 10b, and in this state, the mounting bolt 10a is applied and fixed, whereby the end portion of the stay damper 4 is fixed. The initial position of can be changed, so that the damper stroke can be changed by the amount corresponding to the length L. The bracket 9 constitutes a variable means for varying the initial position of the end portion of the stay damper 4.

According to the above configuration, the initial position of the end portion of the stay damper 4 is changed by rotating the bracket 9, and the stay damper is changed according to the magnitude of the opening / closing operation force required to open / close the back door 3. The length of the working stroke of 4 can be adjusted. That is, by shortening the length of the operation stroke of the stay damper 4, the opening / closing operation force F1 can be changed to the opening / closing operation force F2 as shown in FIG.

For example, in the summer when the outside temperature is high, the viscosity of the oil in the stay damper 4 decreases and the opening / closing operation force decreases, so that the operating stroke is lengthened, while the outside temperature is low in the winter. Since the viscosity of the oil in the stay damper 4 increases and the opening / closing operation force increases, the length of the operating stroke is shortened. This makes it possible to respond to changes in the outside temperature without increasing the type and number of stay dampers, and a stable opening / closing assist force can be obtained regardless of changes in the outside temperature. .

In particular, by rotating the bracket 9, it is possible to selectively take a first position having a long operating stroke of the stay damper 4 and a second position having a short operating stroke. Therefore, the operability is also good.

In the above embodiment, the operation stroke of the stay damper is changed according to the change of the outside air temperature. However, the operation stroke of the stay damper is changed in response to the increase in the door weight due to the mounting of the rear spoiler or the like. It is also possible to do so. In this way, it is possible to deal with the increase without increasing the type and number of stay dampers.

[0020]

[Effect of device]

 According to the invention of claim 1, as described above, the initial position of the end portion of the stay damper is changed by the variable step so that the length of the operation stroke is adjusted according to the magnitude of the opening / closing operation force. As a result, a stable opening / closing assist force can be obtained regardless of the outside temperature and door weight.

According to the second aspect of the present invention, since the length of the operating stroke of the stay damper can be changed by rotating the bracket, the length of the operating stroke can be easily changed.

[Brief description of drawings]

FIG. 1 is a perspective view of the vicinity of a back door at the rear of an automobile.

FIG. 2 is a perspective view of a stay damper.

FIG. 3 is an explanatory diagram of a mounting portion of a stay damper to a back door.

FIG. 4 is a diagram showing a relationship between a damper stroke and an operating force.

[Explanation of symbols]

 1 Car 2 Body 3 Back door 4 Stay damper 9 Bracket (variable means)

Claims (2)

[Scope of utility model registration request] 1. A door such as a back door is openably and closably provided to a vehicle body, one end of a stay damper is rotatably connected to the door, and the other end of the stay damper is rotatably attached to the vehicle body. A door structure of an automobile, which is connected and whose opening and closing operation is assisted by the stay damper, wherein a variable initial position of one of the two end parts of the stay damper is variable. A vehicle door structure characterized by having means. 2. The vehicle door structure according to claim 1, wherein the variable means is a bracket having one end rotatably connected to the end of the stay damper and the other end rotatably connected to the door.