JPH0146360B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a support body in which a connecting rod and a lever are pivotally connected, and one end of a jack is connected to the leg and the other end is connected to the support body. The present invention relates to retractable wheel systems for vehicles, especially aircraft.

[Conventional technology]

The retractable wheel device of such a vehicle has a patent number
No. 169096. Such wheel systems can be subjected to harmful strains about the axis between the ends on which the jacks are mounted due to the stresses applied to the vehicle. Since the connecting rod and the lever are straight in the wheel extended position and bent in the retracted position, this construction itself requires a respective device for fixing it in its respective position, such as a locking hook. If this were not the case, the jack would be burdened with the forces of ground contact, and the jack would be subjected to harmful strains.

[Problem to be solved by the invention]

Therefore, the purpose of the present invention is to safely and reliably draw out the
To provide a durable and robust retractable wheel device for a vehicle that can be retracted.

[Means to solve the problem]

In order to achieve the above object, the present invention uses a jack to force a support body consisting of a rod and a lever that supports a leg part pivoting between a pulled-out position and a retracted position relative to both cars so that both are in a straight line. The present invention provides a wheel device characterized in that a tension spring device is provided to maintain the rod and the lever in a straight line in each of the retracted position and the extended position.

〔effect〕

As mentioned above, when the rod and lever move between the retracted position and the pulled out position, they are in a mutually bent state against the tension spring device. Since it is held in a locked state, there is no need to provide a separate member such as a hook, and it is possible to reliably and minimally prevent harmful strain on the vehicle from being transmitted to the jack.

〔Example〕

Other features and advantages of the invention will be explained in more detail below with reference to the embodiments illustrated in the accompanying drawings.

The wheel assembly of FIGS. 1 and 2 includes a leg 1 consisting of a casing 2 that is pivotable about a first mounting shaft 3 that is solid on the aircraft body; Accordingly, a buffer cylinder 4 can be pivotally supported, and a buffer rod 5 passes through the cylinder 4, and a wheel 6 is attached to the lower end of the rod, and the buffer rod 5 serves as a sliding buffer together with the cylinder 4. In the shock absorber compressed position, the rod 5 protrudes as 5' on the side of the cylinder 4 opposite to the side on which the wheels are mounted.

The total rotation of the cylinder 4 relative to the casing 2 is
It is transmitted to the wheels 6 via the compass 7. The wind resistance of the leg 1 in the "wheel pull-out position" is achieved by a connecting rod 9 attached to the aircraft body so as to be pivotable about a second attachment shaft 10, and a connecting rod 9 that pivots about a pivot shaft 12 and a shaft 13, respectively. This is ensured by the support 8 consisting of the casing 2 and the lever 11 which is removably attached to the connecting rod 9. The two support surfaces provided on the connecting rod 9 and the lever 11 respectively constitute abutting members 14 and 15,
By the action of a tension spring device 16, which has one end attached to the abutting member 15 of the lever 11 and the other end attached to the connecting rod 17 of the connecting rod 9, the connecting rod 9 and the lever 11 are locked in a position where they are aligned with each other. When locked, specifically, when locked in a position slightly forward of the position where the connecting rod and lever are in line with each other, one of the corresponding contact members 14, 15 is supported by the other. It becomes like this. The jack 25 pivots via its cylinder about a second pivot axis 26 on the casing 2 and via its rod about an axis 27 on the connecting rod 9. Shaft 27 on connecting rod 9
is located on the same side as the support body 8 with respect to the line connecting the first and second attachment parts 3 and 10 in both the "vehicle theory drawing position" and the "vehicle theory drawing position".

Furthermore, the second pivot axis 26 and the axis 27 are located as close as possible to the two attachment axes 10, 3 to the aircraft body, so that in various cases the pivot axis 12 is centered on said attachment axis. The two mounting shafts 3, 1 are arranged so that even if forced harmful torque is applied, the effect on the jack 25 is minimal.
The jack 25 is positioned close to the line connecting 0. The two shafts 26, 27 are of course in a parallel position so as to operate in the manner described below.

In FIG. 1, the mounting axes 3, 10 and 12, 13 are perpendicular to the plane of FIG.
is located forward with respect to the longitudinal axis 24 of the casing 2, and the second mounting shaft 10 and the shafts 12, 13 are located rearward of said longitudinal axis 24. When this wheel device is pulled up in the right longitudinal direction in FIG.
It becomes a figure.

The second pivot shaft 26 always connects the two mounting shafts 3 and 10.
For example, if the wheel device is located on the same side as the line connecting the
When the wheel device is in the retracted position (Fig. 2), it is located on the opposite side to the pivot shaft 12, and when the wheel device is in the retracted position (Fig. 2), it is located in two straight lines connecting the first mounting shaft 3 and the first pivot shaft 12, respectively. It is located within a designated area.

In the case of this embodiment, the shaft 27 at one end of the jack 25
is connected to the support 8 directly, in particular to the connecting rod 9 on the support 8, but needless to say, in any way capable of transmitting to the connecting rod 9 the force generated at the end of the jack 25 interlocking with the shaft 27. It is possible. More specifically, when the wheel assembly moves from one of its two positions, a retracted position and an extended position, the wheel assembly operates as follows.

In other words, when extending the jack, rod 21
When pulling out the lever from the retracted position, the connecting rod 9 and the lever 11 are moved in a direction that is not in a straight line, that is, in the case of this drawing, to the left against the tension spring 16.
A rotational moment about the second mounting shaft 10 is generated in the connecting rod 9 .

The jack 25 therefore controls the unlocking of the support 8, and then the wheel arrangement is retracted about the first mounting shaft 3, at which time the pivot shaft 12 receives a torque about the mounting shaft 3. It is lifted by the force generated on the second pivot shaft 26.

The wheel arrangement is retracted against the tension spring 16 to an intermediate position, where the axle 13 is connected to the mounting axle 3,
10, and the mounting shafts are also in a straight line.

A further raising of the wheel arrangement beyond this position takes place with the aid of the tension spring 16 and the force of the jack 25, so that the support 8 ceases to close in the intermediate position and returns to the straight position or slightly below it. At the front, it is opened in front of the intermediate position by the action of a tension spring 16. The wheel assembly thus reaches the "wheel drive position" shown in FIG. 2 with the aid of the jack 25.

In this position, the axis of the jack 25 intersects the line connecting the first mounting shaft 3 and the first pivot shaft 12, and the support body 8 is moved from the "vehicle theory drawing position" to the mounting shaft 3,
It has been confirmed that the transition occurs to the opposite side of the line connecting 10. Therefore, when the wheel device is fixed in the retracted or extended position, the position of the device is stable.

When the rod 21 is pulled into the cylinder 25 of the jack 25 to move the jack 25 backward from the "wheel drive position", an opposing stress is generated on the connecting rod 9, and the connecting rod 9 and the lever 11 are aligned in a straight line. In order to avoid this, the support body 8 is rotated to the left about the mounting shaft 10, that is, in a direction in which the support body 8 is folded against the tension spring 16. The jack 25 thus controls the unlocking of the support 8 and, in turn, the lowering of the wheel arrangement, which is rotated by the torque on the mounting shaft 3 about it. The wheel arrangement continues to descend to an intermediate position on the support where it is successively folded and then aligned again as shown in FIG. Finally, tension spring 1
6 and the effect of the surfaces of the contact members 14 and 15 cooperating when the surfaces of the contact members 14 and 15 are overlapped and supported, the retracted position and the pulled out position of the wheel device are completely positioned. , especially firmly maintained.

In most cases, good results can be obtained by using the corresponding contact member, but in extremely severe usage conditions, problems may occur.

In fact, in very cold countries, ice can form between the connecting rod and the lever extension, making it difficult to obtain the desired position and causing the wheel gear in either position to be unlocked. There is a risk that it will be done.

The example shown in FIG. 3 is an improvement on the wheel arrangement shown in FIGS. 1 and 2, and in particular shows a landing wheel arrangement that can be raised without any external positioning abutment.

FIG. 3 mainly shows the main support of the landing wheel arrangement, for example with the locking device when the wheel arrangement is in the extended position.

Part of the wheel arrangement thus includes a support 108 formed by a connecting rod 109, one end of which is fixed to a second mounting shaft 110 that connects to the body of the aircraft, and in which the shaft The other end of the lever 113 is fixed to one end of the lever 111, and the other end of the lever is attached to the leg 102 so as to rotate about the pivot shaft 112.

The lever 111 includes, at approximately the same height as the axis 113, an eccentric boss carrying an arm 141, one end of which is attached to the boss for rotation about an axis 142, and the other end of the arm 143
It is attached to the connecting rod 109 so as to rotate around the center. The length of the arm 141 is set to a constant value, and the three axes 141, 143, 113 are located approximately at the vertices of the deformable triangle. Arm 141
is composed of two small connecting rods 144, 145, the two connecting rods are connected approximately centrally so as to be mutually pivotable about a rotation axis 146, and the two connecting rods are
The other ends of the book members are connected to shafts 143 and 142, respectively.

In this embodiment, a small connecting rod 144 extends slightly forward of the axle 143 via its extension 160 and carries an axle 146, which allows the extraction and retraction of the wheel arrangement by assuming two positions. The end of the control jack 125 that makes it possible to
46.

Very generally, the jack 125 is constituted by a cylinder 147, in which a piston 148 is movable, the two axes 149, 150 provided by the piston having variable volumes, Pressurized fluid is supplied via 151 and 152, respectively. Both ends 153, 154
Note that the jack is configured to have a predetermined length such that it forms an abutment member for the piston 148 and limits movement of the piston.

The drive rod 155 of the jack 125 can, of course, be connected to the leg 102 schematically shown in the drawings, depending on the case, either directly or indirectly.

Finally, the two small connecting rods 144, 145 are
At 157, the connecting rod 144 is supported by an eccentric portion 158, and at a fulcrum 159, the small connecting rod 14
5 is supported by the spring 156, so
The two supports 157, 159 and the shaft 146 form a triangle and are deformable.

The variant according to the invention works as follows.

The drawing shall show part of the wheel arrangement in the extended position. In order to retract the wheel arrangement, the jack is actuated to obtain the retracted position, ie the piston advances towards the bottom 153.

In this case, the jack creates a tensile force on the shaft 146 and causes the shafts 143, 146, 1 to be approximately aligned.
42 so that they are not in a straight line, and in the case shown,
A small connecting rod 144 is rotated to the left about the shaft 143, and another small connecting rod 145 is rotated to the right about the shaft 142. This movement causes shaft 142
The upper tensile force is transmitted to the mounting shaft 110. As a result, the mounting shaft 110 and the pivot shafts 113 and 112 change from being in a substantially straight line to a state in which they are avoided.The connecting rod 109 is rotated to the left around the mounting shaft 110, and the lever 111 is moved to Rotate to the right around the center. Therefore, by the two types of rotation, the tensile force on the pivot shaft 112 is transferred to the mounting shaft 110.
Add towards. Since the mounting shaft 110 is fixed to the aircraft, the pulling force causes the leg 102 to rotate about the fixed shaft 126 located on the aircraft.

When the piston 154 reaches the distal end 153, the wheel arrangement is fully retracted. It will be appreciated that the support 108 has the same structure as shown, but is in a symmetrical position with respect to a straight line passing through the mounting axis 110 and another fixed location 126.

In fact, in the partially enlarged view, a shaft 1 similar to the mounting shaft 110, shaft 113, and pivot shaft 112, which are almost in a straight line, is shown.
Note that 43, 146, and 142 are shown.

Because of the structure described above, the support 1 has high stability.
08 and the arm 141, and in order to firmly hold the arm formed by the two small connecting rods 144, 145 from a slight alignment, a spring 156 is installed, especially in the small connecting rod. It acts on the rods 144, 145.

Finally, in order to bring the wheel arrangement to the structure shown, it is assumed here that the wheel arrangement is brought into the retracted position.

In such an assumption, the piston 148 of the jack 125 advances toward the bottom 154 of the chamber 150. When the piston reaches the stop position, the arm assumes the shape shown, and when the piston reaches the stop position in the jack, the arm can no longer be moved. Therefore, when the wheel device is controlled to the retracted position, the role of the stop member is to prevent the small connecting rods 144 and 145 from rotating to the left and right, respectively, so that they do not rotate in a manner different from that described above. It is. Finally, when the two small connecting rods 144, 145 are almost aligned, the shaft 14
The distance between the axes 142, 113 and the axes 143, 11 is the maximum.
Since the distance between the three is immobile and constant, the distance 1
Considering that if 43,142 is maximum or almost maximum, then when lever 111 rotates to the right with respect to axis 113, it will reach its final position and all complementary rotations will be avoided. The role of the two small connecting rods 144, 145 is understood. The arm 141 (consisting of two small connecting rods) thus constitutes a positioning device for the lever relative to the connecting rod, which has the same effect as the corresponding abutment, but without the drawbacks mentioned above. has been removed.

It goes without saying that the embodiments described here are only some possible embodiments, and in particular with regard to the attachment of the support 108 and the arm 141, the shafts 143, 14
6, or on the small connecting rod 145 between the shafts 146, 142,
Alternatively, the jack 125 can be connected to the shaft 146 beyond the shaft 142.

However, in the preferred embodiment, the rotational connection of the jack on the small connecting rod is such that in order to achieve two types of counterrotation simultaneously, the jack must simultaneously act on the seam (or small connecting rod) and the support. Point 146 is the support (connecting rod 109)
It is better not to be too far away from the connection point 143 of the upper arm. Furthermore, this allows all operations, such as the pulling out and retracting operations of the wheel arrangement and, in particular, the locking via the aforementioned slightly unaligned part, to be carried out with only one push. . Moreover, the movement of the jack when moving the wheel arrangement from one position to another is very uniform and continuous.

[Brief explanation of drawings]

1 and 2 are sectional views showing the wheel arrangement according to the invention in the "extended position" and the "retracted position", respectively. FIG. 3 shows a portion of a landing wheel system showing an improved example of the present invention. DESCRIPTION OF SYMBOLS 1,102... Leg part, 1,103... First mounting shaft, 6,106... Wheel, 8,108... Support body, 9,109... Connection rod, 10,110... Second mounting shaft , 11, 111...Lever, 12, 11
2...first pivot shaft, 13,113...shaft, 14...
...First abutting member, 15... Second abutting member, 16...
...Tension spring, 25,125... Jacket, 26,
126...Second pivot shaft, 27, 146, 160...
…shaft.

Claims (1)

[Scope of Claims] 1. A leg portion 1 having at least one wheel 6, which is pivotally connected to a first mounting shaft 3 provided on a vehicle, and a second mounting shaft spaced apart from the first mounting shaft 3 of the vehicle. a connecting rod 9 having one end pivotally connected to a shaft 10; and one end pivotally connected to a shaft 13 at the other end of the connecting rod 9, the other end being spaced apart from the first mounting shaft 3 of the leg portion 1. Lever 1 pivotally connected to first pivot shaft 12
1, one end is pivoted to a second pivot shaft 26 that is separate from the first mounting shaft 3 on the leg portion 1 and the first pivot shaft 12 and approaches the first mounting shaft 3, and the other end is connected. an actuator pivotally mounted on a shaft 27 spaced apart from but close to the second mounting shaft 10 of the rod 9, thereby imparting a rotational torque to the leg 1 with respect to the first mounting shaft 3;
a first jack 25, which has one end connected to the connecting rod 9 and the other end to the lever 11, and is firmly supported by the connecting rod 9;
A retractable wheel device for a vehicle, comprising a tension spring device 16 for pressing an abutment member 14 and a second abutment member 15 firmly supported by the lever 11 against each other.