A control cable for preventing the inner core rod from being twisted

Abstract

The present invention discloses a control cable for preventing the inner core rod from being twisted, which comprises an inner core rod, and a rotation adjusting member, a first fixing sleeve, a second fixing sleeve and an end rod located at at least one end of the inner core rod; the rotation adjusting member is located inside the second fixing sleeve; the rotation adjusting member comprises an upper outer core rod, a lower outer core rod, an inner adjusting sleeve and an outer adjusting sleeve; the upper outer core rod and the lower outer core rod are respectively located above and below the inner core rod. When the inner core rod is bent, relative sliding occurs between the upper outer core rod and the lower outer core rod and the inner core rod, and the linear displacement of the relative sliding is converted into the rotation of the inner and outer adjusting members at both ends. The present invention adopts a flat inner core rod in cooperation with a rotation adjusting member that relatively slides with the outer core rod. The linear displacement of the sliding is converted into the rotation of the inner and outer adjusting sleeves, preventing the inner core rod from being twisted when bent. The slotting direction and length of the inner and outer adjusting sleeves control the minimum bending radius of the cable, effectively preventing the cable from being overly bent.

Description

Technical Field

[0001] The present invention relates to the technical field of control cables, and particularly to a control cable for preventing the inner core rod from being twisted. Background Art

[0002] Control cables are widely used in the control processes such as clutch, gear shifting, mechanical braking, throttle control, and transmission control of transportation devices such as automobiles, airplanes, armored vehicles, and motorcycles, for the control connection between various components. As an important component, the service life, load-bearing capacity, and deformation degree of the cable are related to the control accuracy and the safety of users. The control cable transmits the push and pull of the driving force to the next mechanism during the control process.

[0003] A typical parking cable, such as the structure described in the article "Layout and Design of Automobile Parking Brake Cable" published by Cui Xiangbo et al. in "Research and Development" in 2017, mainly consists of a steel wire rope, a protective tube, and other auxiliary components. The protective tube structure includes an inner lining tube, a steel wire coil spring tube, and an outer PVC tube from the inside to the outside. The inner lining tube is made of PE material to reduce the friction with the steel wire rope. The throttle cable structure provided by the public patent "A Throttle Cable Assembly for an Automobile" (CN202021105073.4) includes a cable sleeve, a cable body, and a guiding structure, and the guiding structure can limit the bending degree of the cable to avoid excessive bending degree causing excessive deformation of the cable and shortening the service life.

[0004] However, due to the complex internal structure of transportation devices such as automobiles, airplanes, armored vehicles, and motorcycles, it is still inevitable that the cable is bent or greatly twisted, resulting in low transmission efficiency and insensitive control; excessive operating force and difficult control. Summary of the Invention

[0005] In order to overcome the above problems of the prior art, the present invention provides a control cable with a new structure, whose structure is different from the traditional steel wire rope structure, adopting the form of cooperation between a pull rod and a sheath, which not only reduces the friction inside the cable, but also effectively avoids the problems of twisting and excessive bending degree when the cable is bent, prolongs the service life of the control cable, and has a high transmission efficiency at the same time. The present invention adopts the following technical solutions:

[0006] A control cable for preventing the inner core rod from being twisted, comprising an inner core rod and a rotation adjustment member, a first fixing sleeve, a second fixing sleeve, and an end rod at least one end of the inner core rod. The first fixing sleeve, the second fixing sleeve, and the end rod are connected in sequence. The inner core rod is located inside the first fixing sleeve and the second fixing sleeve, and the end of the inner core rod is located inside the end rod; the rotation adjustment member is located inside the second fixing sleeve.

[0007] In an embodiment provided by the present invention, the rotation adjustment member includes an upper outer core rod and a lower outer core rod; the upper outer core rod and the lower outer core rod are respectively located above and below the inner core rod, playing a role in protecting and limiting the inner core rod; restricting the inner core rod from moving to one side of the overall cable of the control cable when bending, effectively reducing the dead stroke of the cable, capable of transmitting high stroke efficiency, and achieving precise control. When the inner core rod bends, the upper outer core rod and the lower outer core rod slide relative to the inner core rod.

[0008] In order to further limit the inner core rod and at the same time adjust the movement of the upper outer core rod and the lower outer core rod, the rotation adjustment member further includes an anchor, an inner adjustment sleeve, and an outer adjustment sleeve; at one end of the inner core rod, there are at least four anchors, which are respectively fixed on the outer surfaces of the upper outer core rod and the lower outer core rod, two on each surface, and the connection lines of the anchors on the same surface are parallel to the axis of the inner core rod; both the inner adjustment sleeve and the outer adjustment sleeve are cylindrical hollow cylinder structures, the inner adjustment sleeve is sleeved inside the outer adjustment sleeve, and the upper and lower surfaces of the inner adjustment sleeve and the outer adjustment sleeve are respectively provided with rotation grooves, and the anchors of the upper outer core rod and the lower outer core rod respectively pass through the rotation grooves.

[0009] Preferably, the anchor is selected from rivets, rod-shaped components, or rolling anchors.

[0010] Preferably, the anchor is a rivet, and there are four rivets, which are respectively fixed on the end surfaces of the upper outer core rod and the lower outer core rod, two on each.

[0011] Furthermore, the rolling anchor includes a connecting rod fixed to the upper outer core rod and the lower outer core rod respectively and two micro bearings sleeved on the same connecting rod, and the two micro bearings are respectively in contact with the rotation grooves of the inner adjustment sleeve and the outer adjustment sleeve on the same side. When the connecting rod moves, through the rolling contact between the micro bearings and the rotation grooves, the friction is reduced, and the relative movement between the upper outer core rod, the lower outer core rod and the inner adjustment sleeve and the outer adjustment sleeve is smoother.

[0012] The ends of the rivets are respectively nested in the rotation grooves and are relatively free to rotate with the rotation grooves.

[0013] Preferably, the inner adjustment sleeve and the outer adjustment sleeve have the same length, and the rivets of the upper core rod and the lower core rod are located at the middle positions of the rotation grooves of the inner and outer sleeve sets.

[0014] Preferably, the upper and lower surfaces of the inner adjustment sleeve are respectively provided with two rotation grooves, and the rotation grooves on the upper and lower surfaces are symmetric in shape; the upper and lower surfaces of the outer adjustment sleeve are respectively provided with two rotation grooves, and the rotation grooves on the upper and lower surfaces are symmetric in shape. A total of four rotation grooves are provided on each adjustment sleeve.

[0015] Furthermore, the rotation grooves on the upper surface of the inner adjustment sleeve and the rotation grooves on the upper surface of the outer adjustment sleeve are symmetric in inclination angle, the lengths of the rotation grooves are the same, and the length and angle of the rotation grooves determine the minimum bending radius of the cable.

[0016] Preferably, the second fixing sleeve is sleeved on the outer periphery of the outer adjustment sleeve, the inner end of the second fixing sleeve is connected to the first fixing sleeve through a threaded structure, the outer end is sleeved on the outer periphery of the end rod, and a sealing member is provided at the outer end of the second fixing sleeve to seal the connection between the end of the second fixing sleeve and the end rod. The sealing member can be a rubber plug or other commonly used sealing structures.

[0017] The second fixing sleeve is provided with an external thread on the outside, which cooperates with the nut to fix the operating cable at a proper position.

[0018] Preferably, a cavity is provided on one end of the end rod facing the inner core rod, the end of the inner core rod is located inside the end rod, and the bottom of the end rod cavity is rounded to allow the inner core rod to slide freely in the end rod cavity with as little friction as possible.

[0019] Preferably, a double-buckle spiral sleeve is arranged on the periphery of the inner core rod, and the double-buckle spiral sleeve of the cable provides an effective movement space for the inner core rod and provides sufficient supporting force for the inner core rod to prevent the inner core rod from permanent bending and deformation, resulting in low force transmission efficiency and difficulty in operation.

[0020] The double-buckle spiral sleeve is covered with a cable shell to prevent dust and provide protection.

[0021] Preferably, the rotating adjustment member, the first fixing sleeve, the second fixing sleeve and the end rod are located at two ends of the inner core rod.

[0022] Preferably, the double-buckle spiral sleeve is one piece, covering the middle part of the inner core rod, and the two ends of the return spring are respectively located inside the first fixed sleeve, providing effective movement space for the inner core rod and sufficient supporting force for the inner core rod to prevent permanent bending and deformation of the inner core rod, resulting in low force transmission efficiency and difficulty in operation.

[0023] Preferably, the inner core rod is a flat rod with grooves on the upper and lower surfaces respectively, the upper outer core rod and the lower outer core rod are arc-shaped rods respectively, and balls are axially arranged in the space between the upper outer core rod and the inner core rod and between the lower outer core rod and the inner core rod to convert sliding friction into rolling friction, thereby greatly reducing the friction between the inner core rod and the upper outer core rod and the lower outer core rod.

[0024] Furthermore, a boss is arranged inside the second fixing sleeve, and a retaining ring is installed at the contact position between the boss and the outer adjusting sleeve, which can not only keep the outer ends of the inner adjusting sleeve and the outer adjusting sleeve flush, but also prevent the balls from rolling out.

[0025] The control cable provided by the invention can be used for automobile shift and selection cables, as well as steering control of aircraft and armored vehicles, transmission control and other control processes.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention provides a control cable with a novel structure. Different from the traditional steel wire rope structure, the present invention uses a flat inner core rod and a rotating adjustment member that slides relative to the inner core rod, and converts the linear displacement of their relative sliding into the rotation of the inner and outer adjustment members at both ends, preventing torsion when the inner core rod bends. The grooving direction and length of the inner and outer adjustment sleeves control the minimum bending radius of the cable, effectively preventing the cable from being overly bent.

[0028] 2. In order to further reduce the friction between the rotating adjustment member and the inner core rod, rollers are provided between the inner core rod and the rotating adjustment member, converting sliding friction into rolling friction, reducing the operating force, improving the load efficiency, and making the operation more flexible.

[0029] 3. The present invention utilizes the setting of anchor fittings such as rivets on the rotating adjustment member, and cooperates with the inner adjustment sleeve and the outer adjustment sleeve with rotating grooves. When the inner core rod bends, the inner adjustment sleeve and the outer adjustment sleeve rotate along with the forward movement of the upper and outer core rods and the backward movement of the lower outer core rod under the connection of the rivets. When the middle part of the inner core rod is twisted, the rivets rotate relatively freely in the rotating grooves of the inner and outer adjustment sleeves, thus avoiding the occurrence of torsional deformation when the inner core rod bends. When the inner core rod is overly bent, the rivets have moved to the limit position of the rotating groove, effectively avoiding excessive bending. This invention effectively avoids the influence of the torsion and excessive bending of the inner core rod on the transmitted force, and reduces the loss of the transmitted operating force. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0031] Figure 1 It is an overall structure diagram of a control cable provided by the present invention;

[0032] Figure 2 It is Figure 1 partial view A;

[0033] Figure 3 It is Figure 2 main perspective structure diagram;

[0034] Figure 4 It is Figure 3 structural explosion diagram;

[0035] Figure 5 It is a three-dimensional perspective structural explosion diagram;

[0036] Figure 6 It is a right view including the inner core rod, the upper outer core rod and the lower outer core rod;

[0037] Figure 7Schematic diagram of the rolling anchor provided for Example 2.

[0038] Wherein, 1 - inner core rod, 2 - upper outer core rod, 3 - lower outer core rod, 4 - cable sheath, 5 - rivet, 6 - inner adjusting sleeve, 7 - outer adjusting sleeve, 8 - first fixing sleeve, 9 - second fixing sleeve, 10 - end rod, 11 - double - buckle spiral sleeve, 12 - rotating groove, 13 - ball, 14 - boss, 15 - retaining ring, 16 - connecting rod, 17 - miniature bearing. Detailed implementation mode

[0039] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0040] It should be noted that the terms used herein are only for describing the specific implementation mode and are not intended to limit the exemplary implementation mode according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] Example 1:

[0042] A control cable for preventing the inner core rod from being distorted, as Figures 1 to 4 shown, includes an inner core rod 1, an upper outer core rod 2, a lower outer core rod 3, a cable sheath 4. Rivets 5, inner adjusting sleeves 6, outer adjusting sleeves 7, first fixing sleeves 8, second fixing sleeves 9 and end rods 10 are respectively arranged at both ends of the inner core rod 1, and a double - buckle spiral sleeve 11. The upper outer core rod 2 and the lower outer core rod 3 are respectively located above and below the inner core rod 1, playing a role in protecting and limiting the inner core rod 1. When the inner core rod 1 bends, the upper outer core rod 2 and the lower outer core rod 3 slide relative to the inner core rod 1. At one end of the inner core rod 1, there are four rivets 5, which are respectively fixed on the outer surfaces of the upper outer core rod 2 and the lower outer core rod 3, two on each. The inner adjusting sleeve 6 and the outer adjusting sleeve 7 are both of hollow cylindrical structures. The inner adjusting sleeve 6 is sleeved inside the outer adjusting sleeve 7. Rotating grooves 12 are respectively opened on the upper and lower surfaces of the inner adjusting sleeve 6 and the outer adjusting sleeve 7. The ends of the rivets 5 are respectively nested in the rotating grooves 12. As Figure 5As shown, two rotating grooves 2 are respectively formed on the upper surface and the lower surface of the inner adjusting sleeve 6, and the shapes of the rotating grooves 12 on the upper surface and the lower surface are symmetrical; two rotating grooves 12 are respectively formed on the upper surface and the lower surface of the outer adjusting sleeve 7, and the shapes of the rotating grooves 12 on the upper surface and the lower surface are symmetrical; the rotating grooves 12 on the upper surface of the inner adjusting sleeve 6 and the rotating grooves on the upper surface of the outer adjusting sleeve 7 are symmetrical in inclination angle, and the lengths of the rotating grooves are the same. The inner adjusting sleeve and the outer adjusting sleeve have the same length, and the upper and lower outer core rods are riveted at the middle positions of the rotating grooves of the inner and outer sleeve sets. The connecting line of the two rivets on the same surface is parallel to the axis of the inner core rod.

[0043] The rotating groove 12 is specifically an arc-shaped or linear groove inclined in the circumferential direction of the inner adjusting sleeve 6 or the outer adjusting sleeve 7.

[0044] The second fixing sleeve 9 is sleeved around the outer adjusting sleeve 7, the inner end is connected to the first fixing sleeve 8 through a threaded structure, the outer end is sleeved around the end rod 10, and a rubber plug is arranged at the outer end of the second fixing sleeve 9 to seal the connection between the end of the second fixing sleeve 9 and the end rod 10. The outer part of the second fixing sleeve 9 is provided with an external thread, which is matched with a nut to fix the control cable in a proper position. As a typical embodiment, the nut is in two pieces, and a spherical bearing or a spherical plain bearing is arranged between the two nuts and fixed in an automobile or an aircraft. The setting method can refer to the structure of the publicly patented "Push-pull steel cable for aircraft" (Application No.: CN201920157407.3).

[0045] A cavity is formed at one end of the end rod 10 facing the inner core rod 1, the end of the inner core rod 1 is located inside the end rod 10, and the bottom of the cavity of the end rod 10 is rounded to allow the inner core rod 1 to freely slide inside the cavity of the end rod 10 with as little friction as possible.

[0046] The cable housing 4 can be made of an elastic material such as PVC, covers the double-button spiral sleeve 11, and is respectively fixed to the inside of the first fixing sleeve 8 at both ends, playing a role in protection and dust prevention.

[0047] The double-button spiral sleeve 11 is located at both ends of the inner core rod or covers the middle part of the inner core rod; specifically, the double-button spiral sleeve 11 is in one piece and covers the middle part of the inner core rod. The two ends of the double-button spiral sleeve are respectively located inside the first fixing sleeve 8, providing an effective movement space for the inner core rod, providing sufficient support force for the inner core rod, and preventing the inner core rod from generating permanent bending deformation, resulting in low force transmission efficiency and difficult operation.

[0048] As Figure 6As shown, the inner core rod 1 is a flat rod with grooves provided on its upper surface and lower surface respectively. The upper outer core rod 2 and the lower outer core rod 3 are respectively arc-shaped rods. Ball bearings 13 are arranged axially in the spaces between the upper outer core rod 2 and the inner core rod 1, and between the lower outer core rod 3 and the inner core rod 1, converting sliding friction into rolling friction, reducing the operating force, thereby greatly reducing the friction between the inner core rod 1 and the upper outer core rod 2 and the lower outer core rod 3, improving the load efficiency and making the operation flexible. As Figure 3 shown, a boss 14 is provided inside the second fixing sleeve 9, and a retaining ring 15 is installed at the contact position between the boss 14 and the outer adjusting sleeve 7, which can not only keep the outer ends of the inner adjusting sleeve and the outer adjusting sleeve flush, but also prevent the ball bearings 13 from rolling out.

[0049] As a commonly used structure in the art, the materials of the inner core rod 1, the upper outer core rod 2, the lower outer core rod 3, the cable housing 4, the rivet 5, the inner adjusting sleeve 6, the outer adjusting sleeve 7, the first fixing sleeve 8, the second fixing sleeve 9 and the end rod 10, as well as the return spring 11, can all be metal materials, and the specific materials are determined according to the product requirements.

[0050] As the basic pushing and pulling function of the cable, the present invention relates to the inner core rod, the upper outer core rod and the lower outer core rod being in sliding contact through ball bearings. When using the control cable for pushing and pulling actions, the friction force received by the inner core rod is small, improving the load efficiency and making the operation flexible.

[0051] The present invention utilizes the setting of rivets on the rotating adjusting member and cooperates with the inner adjusting sleeve and the outer adjusting sleeve with rotating grooves. When the inner core rod is bent, the inner adjusting sleeve and the outer adjusting sleeve rotate following the forward movement of the upper and outer core rods and the backward movement of the lower outer core rod under the connection of the rivets. When the middle part of the inner core rod is twisted, the rivets rotate relatively freely in the rotating grooves of the inner and outer adjusting sleeves, thereby avoiding the occurrence of torsional deformation when the inner core rod is bent. When the inner core rod is bent excessively, the rivets have moved to the limit position of the rotating grooves, effectively avoiding excessive bending. This invention effectively avoids the influence on the transmitted force caused by the torsion and excessive bending of the inner core rod.

[0052] Embodiment 2

[0053] As a modification to the structure of Embodiment 1, the rivets can be replaced with other rod-shaped components or rolling anchor fittings. As Figure 7 shown, the rolling anchor fitting includes a connecting rod 16 fixed to the upper outer core rod and the lower outer core rod respectively, and two miniature bearings 17 sleeved on the same connecting rod 16. The two miniature bearings are respectively in contact with the rotating grooves 12 of the inner adjusting sleeve 6 and the outer adjusting sleeve 7 on the same side. When the connecting rod moves, the rolling contact between the miniature bearings and the rotating grooves reduces the friction, making the relative movement between the upper outer core rod, the lower outer core rod and the inner adjusting sleeve and the outer adjusting sleeve smoother.

[0054] The control cable provided by the present invention can be used in an environment of -40°C to +215°C, and has properties such as high temperature resistance, aging resistance, corrosion resistance, ozone resistance, acid atmosphere resistance, and mildew resistance. The normal temperature free stroke is 0.5 mm to 1.0 mm, and the high and low temperature change amount is ≤0.5 mm; the minimum bending radius is not less than 50 mm, which is suitable for narrow, complex, and multi-bending environments. When bending at a radius of 70 mm by 60°, the pulling force at room temperature is ≤8 N, and the pulling force in high and low temperature environments is ≤15 N; the stroke and load efficiency are both above 98%. This product can be used as an automobile shift and selection cable; it can be used for the steering control of armored vehicles and the throttle control of aircraft, solving the problem that the mechanical structure steering is very laborious, and has the advantages of high transmission accuracy, convenient layout, and low cost, and can be widely applied in the fields of automobiles, armored vehicles, aircraft, ships, etc.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A control cable for preventing the inner core rod from being distorted, characterized in that, It includes an inner core rod and a rotation adjustment member, a first fixed sleeve, a second fixed sleeve and an end rod at at least one end of the inner core rod. The first fixed sleeve, the second fixed sleeve and the end rod are connected in sequence. The inner core rod is located inside the first fixed sleeve and the second fixed sleeve, and the end of the inner core rod is located inside the end rod. The rotation adjustment member is located inside the second fixed sleeve. The rotation adjustment member includes an upper outer core rod member and a lower outer core rod member. The upper outer core rod member and the lower outer core rod member are respectively located above and below the inner core rod. When the inner core rod is bent, the upper outer core rod and the lower outer core rod slide relative to the inner core rod. A double - buckle spiral sleeve is arranged around the inner core rod, and a cable outer shell covers the double - buckle spiral sleeve. The double - buckle spiral sleeve is one piece, covering the middle of the inner core rod, and both ends of the double - buckle spiral sleeve are respectively located inside the first fixed sleeve. The rotation adjustment member further includes an anchor, an inner adjustment sleeve and an outer adjustment sleeve. At one end of the inner core rod, there are at least four anchors, which are respectively fixed on the end surfaces of the upper outer core rod and the lower outer core rod, two on each surface. The connection lines of the anchors on the same surface are parallel to the axis of the inner core rod. Both the inner adjustment sleeve and the outer adjustment sleeve are cylindrical hollow tubular structures. The inner adjustment sleeve is sleeved inside the outer adjustment sleeve. Rotation grooves are respectively opened on the upper and lower surfaces of the inner adjustment sleeve and the outer adjustment sleeve. The anchors of the upper outer core rod and the lower outer core rod respectively pass through the rotation grooves. The inner adjustment sleeve and the outer adjustment sleeve have the same length, and the anchors are selected from rivets or rolling anchors. The ends of the rivets are respectively nested in the rotation grooves and can rotate freely relative to the rotation grooves. The rolling anchor includes a connecting rod fixed to the upper outer core rod and the lower outer core rod respectively, and two micro - bearings sleeved on the same connecting rod. The two micro - bearings are respectively in contact with the rotation grooves of the inner adjustment sleeve and the outer adjustment sleeve on the same side. Two rotation grooves are respectively opened on the upper and lower surfaces of the inner adjustment sleeve, and the rotation grooves on the upper and lower surfaces are symmetric in shape. Two rotation grooves are respectively opened on the upper and lower surfaces of the outer adjustment sleeve, and the rotation grooves on the upper and lower surfaces are symmetric in shape. A boss is arranged inside the second fixed sleeve, and a retaining ring is installed at the contact position between the boss and the outer adjustment sleeve. A cavity is arranged at one end of the end rod facing the inner core rod. The end of the inner core rod is located inside the end rod, and the bottom of the cavity of the end rod is rounded.

2. The operating cable for preventing the inner core rod from being distorted according to claim 1, wherein The inclination angles of the rotation grooves on the upper surface of the inner adjustment sleeve and the rotation grooves on the upper surface of the outer adjustment sleeve are symmetric, and the lengths of the rotation grooves are the same.

3. The actuating cable for preventing the inner core rod from being twisted according to claim 2, wherein The second fixed sleeve is sleeved around the outer adjustment sleeve. The inner end of the second fixed sleeve is connected to the first fixed sleeve through a threaded structure, and the outer end is sleeved around the end rod. A seal is arranged at the outer end of the second fixed sleeve to seal the connection between the end of the second fixed sleeve and the end rod.

4. A control cable for preventing the inner core rod from being distorted according to claim 1, characterized in that, The inner core rod is a flat rod with grooves respectively arranged on the upper and lower surfaces. The upper outer core rod and the lower outer core rod are respectively arc - shaped rods. Ball bearings are arranged axially in the spaces between the upper outer core rod and the inner core rod and between the lower outer core rod and the inner core rod.

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