CN109733132B - Rigidity dynamically adjustable pull type recreational vehicle ball head connecting device - Google Patents
Rigidity dynamically adjustable pull type recreational vehicle ball head connecting device Download PDFInfo
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- CN109733132B CN109733132B CN201910072072.XA CN201910072072A CN109733132B CN 109733132 B CN109733132 B CN 109733132B CN 201910072072 A CN201910072072 A CN 201910072072A CN 109733132 B CN109733132 B CN 109733132B
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- 238000003825 pressing Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses a pull type caravan ball head connecting device with dynamically adjustable rigidity, which comprises a connecting ball, a ball head connecting device shell, a pressing block, a spring guide rail, a first spring, a second spring, a third spring and an adjusting nut, wherein the springs equivalent to the first spring, the second spring and the third spring have the characteristic of dynamically adjustable rigidity, the rigidity of the device can be preset by rotating the adjusting nut so as to meet the requirements of pull type caravans with different tonnages, the impact of inertia of a rear car on a front car in the braking process is reduced, the connecting ball is prevented from being damaged, the rigidity of the device is dynamically adjusted in the braking process, the impact is reduced, the reliability of the connecting device is ensured, and when the adjusting nut is completely unscrewed, the connecting ball is easy to separate from the connecting device.
Description
Technical Field
The invention relates to the technical field of pull type caravan connecting devices, in particular to a pull type caravan ball head connecting device with dynamically adjustable rigidity.
Background
The connecting device of the trailer type caravan can be divided into two parts according to the installation position: a front vehicle (traction vehicle) connecting device and a rear vehicle (pull type caravan) connecting device. The front vehicle device comprises a trailer arm base, a trailer arm, a lock pin, a connecting ball and the like; the rear vehicle device is mainly a ball head connecting device. The connecting ball is arranged on the front vehicle and is fixed by a bolt and a check washer. Because the pull type caravan is a central shaft trailer, the total weight of the caravan is 10-15% borne by the connecting ball, and the stress is most concentrated in the pull type caravan connecting device. The ball head connecting device is arranged at the front end of the trailer type house and is connected with the connecting ball. The ball head connecting device is provided with a ball socket, and the size of the ball socket is matched with that of a ball head of the connecting ball. The ball socket is composed of a ball head connecting device shell (fixed) and a locking mechanism (movable), wherein the locking mechanism is movable, and the compression or release of the connecting ball can be realized through a spring.
The ball socket of the conventional ball joint device is composed of a ball joint device shell (fixed) and a locking mechanism (movable), and pressure is applied in the vehicle running direction, so that the rigidity is fixed. For example, the Chinese patent discloses an automatic distribution control device of braking force of a pull type motor home and a control method thereof, the device adjusts the left and right braking force of a motor home brake through a PWM controller to generate a yaw moment so that the pull type motor home can be stably braked, the device only has the transverse braking performance of the pull type motor home, the impact of a rear vehicle on a front vehicle during longitudinal braking is not considered, and the problem can be solved if the rigidity of a connecting device is changed. When the vehicle runs on a bumpy road or the vehicle runs at high speed for emergency braking, the front vehicle is impacted due to inertia of the motor home, and if the rigidity design is small, the connecting ball is easy to damage, and the connecting device is separated, so that the danger is very high. However, if the rigidity of the ball head connecting device is designed to be large, the connecting device is not easy to install. Meanwhile, for rear vehicles (pull type motor homes) with different tonnages, the required rigidity is inconsistent, and a ball head connecting device with dynamically adjustable rigidity is required to adapt to the rear vehicles (pull type motor homes) with different tonnages.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the pull type caravan ball head connecting device with dynamically adjustable rigidity, so that the connecting device is convenient to mount and separate, and meanwhile, the connecting device can adjust the rigidity according to rear cars (pull type caravans) with different tonnages to reduce the impact of the rear cars on connecting balls in the braking process.
The invention adopts the following technical scheme to realize the technical purpose.
A pull type caravan ball head connecting device with dynamically adjustable rigidity comprises a spring and an adjusting nut, and the equivalent rigidity of the device is changed by rotating the adjusting nut.
In the above scheme, the spring includes first spring, second spring and third spring, and first spring one end fixed welding is on the briquetting, and the other end contacts with adjusting nut, and first spring intermediate portion links to each other with the one end of second spring, third spring.
In the above scheme, the first spring is provided with a spring guide rail at the periphery, one end of the spring guide rail is fixedly welded on the pressing block, and the other end of the spring guide rail is movably sleeved in the adjusting nut.
In the above scheme, the two transverse sides of the spring guide rail are provided with round holes for the second spring and the third spring to pass through.
In the above scheme, after the second spring and the third spring pass through the round holes, the other ends of the second spring and the third spring are respectively fixed with the ball head connecting device shell.
In the above scheme, the pressing block is installed in the ball head connecting device shell, one side of the pressing block is in contact with the ball head part of the connecting ball, and the contact side is a concave curved surface and is matched with the ball head part of the connecting ball.
In the above scheme, the ball head part of the connecting ball is clamped with the ball head connecting device shell.
In the above scheme, the axes of the first spring, the second spring and the third spring are coplanar.
The invention has the beneficial effects that: the invention adapts to rear vehicles (trailer type caravans) with different tonnages through the rigidity of the equivalent spring of the adjusting device, reduces the impact of the rear vehicle on the front vehicle due to inertia in the braking process and prevents the connecting ball from being damaged; in the braking process, the rigidity is dynamically adjusted, so that the connection reliability of the connecting device is ensured while the impact is reduced; adopt adjusting nut, make this connecting device can predetermine different equivalent stiffness according to the back car accuracy of difference, simultaneously when unscrewing adjusting nut completely, the connection ball easily separates with connecting device.
Drawings
FIG. 1 is a schematic view of a trailer type caravan ball head connecting device with dynamically adjustable rigidity;
FIG. 2 is a schematic diagram of the arrangement of springs of the trailer type caravan ball head connecting device with dynamically adjustable rigidity;
FIG. 3 is a variable stiffness schematic diagram of the trailer type caravan ball joint connection device with dynamically adjustable stiffness according to the present invention;
in the figure, 1, a ball is connected; 2. a ball joint connecting device housing; 3. briquetting; 4. a spring guide rail; 5. a first spring; 6. a second spring; 7. a third spring; 8. and adjusting the nut.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description of the drawings, but the scope of the present invention is not limited thereto.
Fig. 1 and 2 show an embodiment of a trailer type caravan ball joint device with dynamically adjustable rigidity, which comprises a connecting ball 1, a ball joint device shell 2, a press block 3, a spring guide rail 4, a first spring 5, a second spring 6, a third spring 7 and an adjusting nut 8. The connecting ball 1 is arranged on the front vehicle, and the ball head part of the connecting ball 1 is clamped with the ball head connecting device shell 2 and is used for transmitting the traction force of the front vehicle; the ball joint device shell 2 is the main structure of the ball joint device and is used for connectingUnder the traction of a front vehicle, the front end of the ball head connecting device shell 2 is connected with the connecting ball 1, and the tail end of the ball head connecting device shell is connected with the adjusting nut 8 through threads; the ball head connecting device shell 2 is arranged on the motor home; the pressing block 3 is arranged in the ball head connecting device shell 2, one side of the pressing block 3 is in contact with the ball head part of the connecting ball 1, the side is a concave curved surface and matched with the radian of the ball head part of the connecting ball 1, and the other side of the pressing block is connected with the spring guide rail 4 and the first spring 5 and used for clamping the connecting ball 1; one end of the spring guide rail 4 is fixedly welded on the pressing block 3, the other end of the spring guide rail is movably sleeved in the adjusting nut 8 and used for limiting the degree of freedom of the first spring 5, and the spring guide rail 4 is sleeved on the periphery of the first spring 5 so that the first spring 5 is compressed or extended along the axial direction of the spring guide rail 4; one end of the first spring 5 is fixedly welded on the pressing block 3, and the other end of the first spring is in contact with the adjusting nut 8 and is used for providing main clamping force for clamping the connecting ball 1; as shown in fig. 2, round holes are formed on two lateral sides of the spring guide rail 4 for passing through the second spring 6 and the third spring 7, so that the second spring 6 and the third spring 7 can be freely stretched and bent in the round holes; the middle part of the first spring 5 is connected with a second spring 6 and a third spring 7; one end of a second spring 6 is fixedly welded on one side of the first spring 5, and the other end of the second spring passes through a round hole on the spring guide rail 4 and is fixedly welded on the ball head connecting device shell 2 and used for changing the rigidity of the device when the first spring 5 is compressed; one end of a third spring 7 is fixedly welded on the other side of the first spring 5, and the other end of the third spring passes through a round hole on the spring guide rail 4 and is fixedly welded on the ball head connecting device shell 2 and used for changing the rigidity of the device when the first spring 5 is compressed; the axes of the first spring 5, the second spring 6 and the third spring 7 are coplanar; in fig. 2, the first spring 5 is divided into two sections, the spring stiffness is equal, and both are k1The second spring 6 and the third spring 7 are respectively arranged at two sides of the first spring 5, the axes of the second spring 6 and the third spring 7 are at the initial balance position on the same straight line, and meanwhile, the rigidity of the second spring 6 is equal to that of the third spring 7, and both the rigidity are k2(ii) a Adjusting nut 8's whole threaded end and sleeve of dividing into, threaded end threaded connection is in 2 tail end screw threads departments of bulb connecting device casing, and the suit is in bulb connecting device casing 2 outside the sleeve, and the sleeve inboard is equipped with spring guide 4, and the free end of first spring 5 contacts with adjusting nut 8, presses and is adjustingThe inner end surface of the nut 8; and rotating the adjusting nut 8 to compress the first spring 5 and simultaneously stretch the second spring 6 and the third spring 7 to perform variable stiffness adjustment.
Fig. 3 shows the adjusting process of the equivalent stiffness K of the trailer type caravan ball head connecting device with dynamically adjustable stiffness of the invention:
the first condition is as follows: the second spring 6 and the third spring 7 are at initial balance positions on the same straight line, and the equivalent stiffness K of the equivalent spring of the device is at the time1Comprises the following steps:
K1＝k1 (1)
case two: the adjusting nut 8 is screwed, the inner end surface of the adjusting nut 8 extrudes the first spring 5 to generate total displacement delta x, and the second spring 6 and the third spring 7 divide the first spring 5 into two sections with the lengths of l respectively1And l2Because the first spring 5 is compressed to generate displacement, the axes of the second spring 6, the third spring 7 and the first spring 5 form an included angle alpha, and the original lengths of the second spring 6 and the third spring 7 are set as a, at this time, the first spring 5, the second spring 6 and the third spring 7 can be equivalent to one spring, and the equivalent stiffness of the equivalent spring is K2。
Wherein one section l of the first spring 51The displacement of (a) is:
another section l of the first spring 52The displacement of (a) is:
the included angle alpha is:
the force of the first spring 5 is as follows:
F1＝k1Δx (5)
the displacement Δ x' of the second spring 6 and the third spring 7 is:
the stress of the second spring 6 and the third spring 7 is as follows:
equivalent stiffness K of equivalent spring2Comprises the following steps:
the equivalent stiffness K of the equivalent spring is simplified by the formulas (4), (5) and (7)2Comprises the following steps:
when alpha changes, the equivalent stiffness K of the device2The rigidity is dynamically adjustable by changing the rigidity.
Case three: in the braking process, the connecting ball 1 pushes the press block 3 to compress the first spring 5, the second spring 6, the third spring 7 and the axis of the first spring 5 form an included angle alpha, and the equivalent stiffness K of the equivalent spring is the same as the equivalent stiffness K of the equivalent spring3Comprises the following steps:
the specific working state is as follows:
the first state: the state of the connecting ball is released, the adjusting nut 8 is unscrewed outwards, the first spring 5 is not compressed any more, at the moment, the first spring 5 can freely move along the axis of the first spring, the connecting ball 1 is easy to separate, and the connecting device is convenient to disassemble and separate;
and a second state: in a pre-tightening state, the adjusting nut 8 is screwed inwards, the first spring 5 is compressed to clamp the connecting ball 1, and meanwhile, the second spring 6, the third spring 7 and the first spring 5 are driven to form an included angle alpha, so that the equivalent stiffness of the device is changed; further, when the mass of the rear vehicle is small, the adjusting nut 8 is screwed inwards, so that the connection reliability of the connecting ball 1 is guaranteed; when the rear vehicle has larger mass, the adjusting nut 8 is unscrewed outwards, and the equivalent rigidity K is reduced;
and a third state: in an emergency braking state of the vehicle, due to inertia of a rear vehicle, impact is generated on the connecting ball 1, when the mass of the rear vehicle is larger, the impact is larger, and the connecting ball 1 is easy to damage to cause danger; the connecting ball 1 has a reaction force on the pressing block 3, when the equivalent rigidity K of the device is high, the impact is high, when the rigidity is low, the impact is low, and the buffering effect is low; meanwhile, when the connecting ball 1 pushes the pressing block 3 to move, the first spring 5 is pressed, the included angle alpha is increased, the equivalent stiffness K is reduced, and after large impact is generated, the equivalent stiffness K of the device is further reduced to play a role in shock absorption; when the initial equilibrium position is exceeded, the equivalent stiffness K increases, preventing the connecting ball 1 from coming off the connecting device.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. A pull type caravan ball head connecting device with dynamically adjustable rigidity is characterized by comprising a spring and an adjusting nut (8), wherein the equivalent rigidity of the device is changed by rotating the adjusting nut (8);
the spring comprises a first spring (5), a second spring (6) and a third spring (7), one end of the first spring (5) is fixedly welded on the pressing block (3), the other end of the first spring is in contact with the adjusting nut (8), and the middle part of the first spring (5) is connected with one ends of the second spring (6) and the third spring (7);
the specific case of changing the equivalent stiffness of the device includes:
the first condition is as follows: the adjusting nut (8) is screwed, the first spring (5) is compressed to generate displacement, and the second spring (6), the third spring (7) and the axis of the first spring (5) form an included angleαAt this time, the equivalent stiffness of the equivalent spring of the device
When is coming into contact withαEquivalent stiffness of the device when variedK 2The rigidity is dynamically adjustable by changing; whereinl 1Andl 2are respectively two lengths of the first spring (5) divided by the second spring (6) and the third spring (7),k 1is the stiffness of the first spring (5),k 2the rigidity of the second spring (6) and the third spring (7);
case two: in the braking process, the connecting ball (1) pushes the pressing block (3) to compress the first spring (5), and the second spring (6), the third spring (7) and the axis of the first spring (5) form included anglesαAt this time, the equivalent stiffness of the equivalent spring of the device
Whereinl 1Andl 2are respectively two lengths of the first spring (5) divided by the second spring (6) and the third spring (7),k 1is the stiffness of the first spring (5),k 2the rigidity of the second spring (6) and the third spring (7).
2. The pull type caravan ball joint device with dynamically adjustable rigidity according to claim 1, wherein a spring guide rail (4) is arranged on the periphery of the first spring (5), one end of the spring guide rail (4) is fixedly welded on the pressing block (3), and the other end of the spring guide rail (4) is movably sleeved in the adjusting nut (8).
3. The trailer-type recreational vehicle ball joint device with dynamically adjustable rigidity according to claim 2, wherein round holes for the second spring (6) and the third spring (7) to pass through are formed in the two transverse sides of the spring guide rail (4).
4. The trailer type caravan ball joint device with dynamically adjustable rigidity according to claim 3, wherein the other ends of the second spring (6) and the third spring (7) are respectively fixed with the ball joint device shell (2) after passing through the round holes.
5. The trailer type caravan ball head connecting device with the dynamically adjustable rigidity according to claim 4, wherein the pressing block (3) is installed in the ball head connecting device shell (2), one side of the pressing block (3) is in contact with the ball head part of the connecting ball (1), and the contact side is a concave curved surface and is matched with the ball head part of the connecting ball (1).
6. The trailer-type recreational vehicle ball head connecting device with dynamically adjustable rigidity according to claim 5, characterized in that the ball head part of the connecting ball (1) is clamped with the ball head connecting device shell (2).
7. A dynamically stiffness adjustable trailer as claimed in any one of claims 1 to 6 wherein the axes of the first spring (5), the second spring (6) and the third spring (7) are coplanar.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910072072.XA CN109733132B (en) | 2019-01-25 | 2019-01-25 | Rigidity dynamically adjustable pull type recreational vehicle ball head connecting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910072072.XA CN109733132B (en) | 2019-01-25 | 2019-01-25 | Rigidity dynamically adjustable pull type recreational vehicle ball head connecting device |
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| CN109733132A CN109733132A (en) | 2019-05-10 |
| CN109733132B true CN109733132B (en) | 2021-10-12 |
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| CN201910072072.XA Active CN109733132B (en) | 2019-01-25 | 2019-01-25 | Rigidity dynamically adjustable pull type recreational vehicle ball head connecting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110239292B (en) * | 2019-05-21 | 2021-07-20 | 江苏大学 | Rigidity-variable pull type recreational vehicle ball head connection buffering device |
| CN110588260B (en) * | 2019-08-27 | 2022-11-18 | 江苏大学 | Connecting ball head and connecting system of anti-loosening pulling type motor home |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29909176U1 (en) * | 1999-05-26 | 1999-08-12 | Iller, Heinz, 93426 Roding | Ball head coupling for attaching trailers to bicycles and mopeds |
| CN201300677Y (en) * | 2008-10-10 | 2009-09-02 | 郭虎 | Split type connecting device of motor tricycle |
| CN207241329U (en) * | 2017-07-18 | 2018-04-17 | 上汽大众汽车有限公司 | Damping draw hook |
| CN109060209A (en) * | 2018-06-29 | 2018-12-21 | 南京汽车集团有限公司 | Measuring device and measurement method for sedan braking system dynamic brake force moment |
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Effective date of registration: 20240228 Address after: 1003, Building A, Zhiyun Industrial Park, No. 13 Huaxing Road, Henglang Community, Dalang Street, Longhua District, Shenzhen City, Guangdong Province, 518000 Patentee after: Shenzhen Wanzhida Technology Transfer Center Co.,Ltd. Country or region after: China Address before: Zhenjiang City, Jiangsu Province, 212013 Jingkou District Road No. 301 Patentee before: JIANGSU University Country or region before: China |