JP4481398B2 - Stroke adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stroke adjusting device. More particularly, the present invention relates to an apparatus for absorbing the elongation of a control cable for a vehicle.
[0002]
[Prior art]
A vehicle brake device for a motorcycle and a brake lever (operation member) are connected to each other via a conduit and an operation wire that is slidably inserted into the conduit, and the operation force of the brake lever is applied to the vehicle brake. In the mechanism configured to transmit to the device, there is a problem that the play stroke of the brake lever becomes large due to the extension of the inner cable during use, and the operating feeling of the brake changes when exceeding a predetermined stroke amount.
[0003]
In order to solve such a problem, Japanese Examined Patent Publication No. 63-1238 discloses that an operation member is connected to a vehicle brake device via an operation wire composed of a conduit and an inner line inserted into the conduit. A vehicle brake device (hereinafter referred to as “prior art”) that can operate the vehicle brake device by operating the operation member is disclosed.
[0004]
According to the prior art, (1) the conduit is composed of first and second conduit portions and a housing interposed between the first and second conduit portions. 2 An inner cable is inserted in the conduit portion and the housing in the vertical direction. (2) The adjuster bolt is inserted into the housing so as not to rotate and move in the axial direction. (3) In the housing. An adjuster is provided, and a ratchet pawl provided on the outer periphery of the adjuster is screwed with an outer periphery of the adjust bolt, the adjuster is rotatably engaged with the housing. (4) An adjust lever is provided in the housing. The adjustment lever includes a first arm portion that can be engaged with the inner cable with a predetermined floating gap, and a second arm portion that is detachably locked to the ratchet pawl, (5) Howdin A spring that urges the adjustment lever in a direction to engage the ratchet pawl; and (6) a stopper in the housing that restricts the swing limit of the adjustment lever against the urging force of the spring. It is characterized by being provided.
[0005]
[Problems to be solved by the invention]
In the case of the above-described prior art apparatus, the adjuster is rotated by the swing of the adjusting lever, and the adjusting bolt is moved in the axial direction. This absorbs the “elongation” exceeding the predetermined stroke amount of the inner cable, but absorbs elastic and permanent elongation by the stroke when a load is applied to the control cable. There is a problem that even an excessive stroke amount due to a sliding failure of the rope is detected as “elongation” and the adjustment bolt is moved.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a stroke adjusting device that eliminates the conventional problems described above, does not limit the amount to be stretched, has no fear of excessive stretching, is lightweight, and has a simple structure. That is.
[0007]
[Means for Solving the Problems]
According to one aspect of the invention,
A device for absorbing the elongation of a control cable for a vehicle,
A housing that can be slidably inserted in the axial direction through the end of the inner cable control cable;
Conversion means for converting the axial reciprocation of the end of the insole into a rotational motion with respect to the housing.
A male screw that is moved in the direction of absorbing elongation by the converting means is formed at the end of the inner cable ,
The conversion means includes a substantially cylindrical moving element screwed to the inner cable terminal and a pair of stators fixed to the housing, and a predetermined number of teeth are provided on one side of the moving element. The same number of teeth as one side are formed on the other side of the moving element, and each tooth meshes with a pair of stators in accordance with the axial movement, and the teeth on one side of the moving element Is engaged with one of the teeth of the stator, the other teeth of the mover and the teeth on the other side of the stator are slightly shifted in pitch. There is provided a spring that is urged so as to be engaged with the formed teeth, and the stator has the same number of teeth as the mover, and a female screw that engages with a male screw formed at the end of the inner cable. It is characterized by being formed on the movable element .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An apparatus for absorbing the elongation of a control cable for a vehicle according to the present invention (hereinafter simply referred to as “apparatus”) will be described in detail below with reference to the accompanying drawings.
[0011]
Embodiment 1
FIG. 1 is a partially broken perspective view showing an example of an apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional explanatory view of a main part of the apparatus of FIG. 1, and FIGS. 3 and 4 show operations of the apparatus of FIG. FIG. 5 is a partial cross-sectional explanatory view showing an example of an apparatus according to another embodiment of the present invention.
[0012]
1 and 2, the apparatus of the present invention includes a housing 1 through which a terminal (screw end) 5 fixed to an inner cable 10 of a control cable can be slidably inserted while preventing rotation, and a terminal (screw). It is composed of conversion means 2, 3, 4 that are engaged with the end 5 and convert the axial movement of the inner cable 10 into rotational movement, and a male screw Ta is formed at the terminal (screw end) 5. Has been.
[0013]
In the case of the present embodiment, the converting means includes a substantially cylindrical moving element 4 that is screwed into the screw end 5 and a substantially cylindrical shape that is non-rotatable and coaxially arranged and fixed inside the housing 1. It is composed of stators 2 and 3.
[0014]
In the case of the present embodiment, a predetermined number (for example, 10 teeth) of teeth Na is formed on one side of the mover 4, and the same number of teeth Nb (for example, as one end) is formed on the other end of the mover 4. The number of teeth 10) is formed. When the axial length La of the crests of the teeth of the mover 4 is longer than the axial gap Lb between the crests of the teeth of the stators 2 and 3, the mover 4 is relative to the stators 2 and 3. This is preferable because it does not idle and operates reliably by one pitch (see FIG. 3).
[0015]
The tooth Na formed on one side of the movable element 4 and the tooth Na on the other end are slightly shifted in pitch (in this embodiment, 0.5 pitch is shifted).
[0016]
In the illustrated example, the pitches of the teeth formed at both ends of the mover are shifted from each other, and there is no shift in the pitch on the stator side, but there is no shift in the pitch of the teeth at both ends of the mover. It is also possible to shift the pitch of the teeth on both sides of the child.
[0017]
Further, a spring 6 is provided for biasing the teeth Na of the moving element 4 with the teeth Nb of the stators 2 and 3 in a direction in which the inner cable 10 is tensioned.
[0018]
Further, the moving element 4 is formed with a female screw Tb that is screwed with a male screw Ta formed on the screw end 5.
[0019]
Next, the operation of the apparatus according to the present invention will be described with reference to FIGS.
[0020]
Now, it is assumed that the spring 6 that biases the tooth Na of the moving element 4 to engage the tooth Nb of the stator 2 and 3 is a compression coil spring (see FIG. 3). In this case, the operation state such as the clutch and brake of the automobile as shown in FIG. 3A shifts to a non-operation state where the clutch pedal and the brake pedal are released, and the control cable is stretched and the stator 2 and the mover When the gap with respect to 4 exceeds a predetermined set amount ε and becomes (ε + δ), the mover 4 is pressed in the direction of the stator 3 by the elastic force of the compression coil S.
[0021]
Now, assuming that the pressing force of the moving element 4 against the stator 3 is F and the angle between the horizontal portion of the teeth Nb of the stator 3 and the inclined surface portion is θ (see FIG. 4), the stator 3 of the pressing force F The component force F1 in the direction perpendicular to the slope of the tooth Nb is F · sin θ, and the component force F2 in the slope direction is F · cos θ.
[0022]
Therefore, when the moving element 4 is pressed in the direction of the stator 3 by the elastic force of the compression coil S, the moving element 4 slides downward along the inclined surface of the stator 3 and is 0.5 pitch downward in the vertical direction. It moves and it will be in the state shown by (c) of FIG. Next, when the operation state is entered, the moving element 4 is further pressed by 0.5 pitch because it is pressed toward the stator 2 side. In FIG. 3, the movable element 4 and the stator 3 are described in two dimensions to explain the principle of the present invention. However, in actuality, the movable element 4 and the stationary element 3 are annular or cylindrical three-dimensional. Since it has a shape, a rotational movement is obtained by a movement that moves downward in the vertical direction while sliding downward along the slope of the stator 3 in FIG. In addition, since the movement of the moving element 4 in the axial direction is transmitted to the housing 1 via the protrusion 4a at the center of the moving element, the teeth Na and Nb are not subjected to a large load.
[0023]
The apparatus according to the present embodiment is not limited to the application to the extension absorption in the axial direction of the inner cable, but can also be applied to the absorption of the contraction of the outer cable.
[0024]
Embodiment 2
FIG. 5 shows an example of an apparatus according to another embodiment of the present invention.
[0025]
The apparatus according to the present embodiment is provided at an engaging portion between an inner cable 20 that functions as a front cable and an equalizer 23. The housing 1 is provided on the equalizer 23 via a pin 1a, and the housing 1 is provided inside the housing 1. The substantially cylindrical stators 2 and 3 are fixed to each other, and a mover is provided inside the housing 1 so as to be rotatable and movable between the stators 2 and 3. Similar to the apparatus of the first embodiment, the screw end 22 which is the terminal 5 of the inner cable 20 is formed with a male screw Ta, and the moving element 4 is a female screw engaged with the male screw Ta. Screws are formed. The male screw Ta passes through the stators 2 and 3.
[0026]
A washer 7 is fixed to the male screw Ta of the end 5 of the inner cable 20, and a compression coil spring 6 is provided between the washer 7 and the flange portion 2 a of the stator 2. It is urged in the direction of. Similarly to the first embodiment, teeth are formed on the movable element 4 and the stators 2 and 3.
[0027]
When a parking brake lever (not shown) or the like is pulled, the screw end 22 moves in the direction of arrow x, the moving element 4 also moves in the direction of arrow x, and the moving element 4 moves the housing 1 in the direction of arrow x. Press.
[0028]
Next, this motion is transmitted to the equalizer 23 via the pin 1a.
[0029]
When permanent elongation occurs in the inner cable (front cable) 20, the housing 1 is moved in the direction of the arrow x with respect to the screw end 22 by the action of the compression coil spring 6 provided between the screw end 22 and the case. The teeth of the mover 4 mesh with the teeth of the opposite stator 3 and rotate by 0.5 pitch. Next, when the lever is pulled, the teeth of the mover mesh with the teeth of the right stator 4 and 0 By rotating 5 pitches, the housing 1 moves in the direction of the arrow x by one pitch, so that the elongation can be obtained accordingly.
[0030]
The apparatus according to the present embodiment is not limited to the application to the extension absorption in the axial direction of the inner cable, but can also be applied to the absorption of the contraction of the outer cable.
[0031]
【The invention's effect】
According to the present invention, since the spring length can be set freely, the amount of stretch is not limited, and only permanent stretch is removed by one pitch, so there is no risk of excessive stretch, light weight and simple. A device for absorbing the extension of the control cable inner cable for a vehicle having a simple structure is obtained.
[Brief description of the drawings]
FIG. 1 is a partially broken perspective view showing an example of an apparatus according to an embodiment of the present invention.
2 is an explanatory cross-sectional view of a main part of the apparatus of FIG.
FIG. 3 is an explanatory diagram showing the operation of the apparatus of FIG. 1;
FIG. 4 is an explanatory diagram showing an operation of the apparatus of FIG. 1;
FIG. 5 is a partial cross-sectional explanatory view showing an example of an apparatus according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing 2, 3 Stator 4 Mover 5 Terminal 6 Spring 10, 20 Inner cable

Claims (1)

A device for absorbing the elongation of a control cable for a vehicle,
A housing that can be slidably inserted in the axial direction through the end of the inner cable control cable;
Conversion means for converting the axial reciprocation of the end of the insole into a rotational motion with respect to the housing.
A male screw that is moved in the direction of absorbing elongation by the converting means is formed at the end of the inner cable ,
The conversion means includes a substantially cylindrical moving element screwed to the inner cable terminal and a pair of stators fixed to the housing, and a predetermined number of teeth are provided on one side of the moving element. The same number of teeth as one side are formed on the other side of the moving element, and each tooth meshes with a pair of stators in accordance with the axial movement, and the teeth on one side of the moving element Is engaged with one of the teeth of the stator, the other teeth of the mover and the teeth on the other side of the stator are slightly shifted in pitch. There is provided a spring that is urged so as to be engaged with the formed teeth, and the stator has the same number of teeth as the mover, and a female screw that engages with a male screw formed at the end of the inner cable. device you wherein Rukoto such is formed in the mover.

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