CZ2020397A3 - Tilting towing device - Google Patents

Abstract

The tilting towing device comprises a suspension ball (4) at one end of the support arm (5), the other end of which is provided with a suspension eye (6) with an opening (7) forming an outer bearing ring (8) rotatably mounted on a cylindrical guide sleeve ( 12) provided with a front suspension flange (14) firmly connected to the support plate (2) of the vehicle. The position of the outer ring (8) of the bearing is lockable by a locking body (21) which is movably arranged in a through radial guide (16) formed in the wall of the cylindrical guide sleeve (12) for engagement with the inner radial recess (9) of the outer ring (8). and is operable by an actuating body (31) movably mounted in the guide sleeve (12), the locking body (21) being rotatably mounted in the actuating body (31) or in the cylindrical guide sleeve (12).

Description

Tiltable towing device

Field of technology

The invention relates to a tilting towing device, in particular for a motor vehicle trailer, comprising a suspension ball at one end of the support arm, the other end of which is provided with a suspension eye with a hole that forms the outer ring of the bearing, mounted rotatably on a cylindrical guide sleeve provided with a front suspension flange connected firmly with a vehicle support plate, for rotating the support arm between a working position for suspending a motor vehicle trailer on a suspension ball and a rest position for folding the support arm under the bumper of a motor vehicle, the position of the outer ring of the bearing being lockable by a blocking body which is movably arranged in a continuous radial guide formed in the wall of the cylindrical guide sleeve for engagement with the inner radial recess of the outer ring of the bearing, and is controllable by the control body mounted movably in the guide sleeve.

Current state of the art

The tilting towing device for motor vehicles is the subject of intense interest, which aims to simplify the design of the rotation of the support arm between the working position for hanging the trailer of the motor vehicle on the suspension ball and the rest position for folding the support arm under the bumper of the motor vehicle, and to easily and reliably arrest the position of the support arms in working or rest position.

From the document DE19848487 a tilting towing device is known, comprising a support arm with a suspension ball at one end of the arm and with a rotary bearing body located at the other end of the arm. The support arm is movable between the working position and the resting position. The slewing bearing body is positioned immovably with respect to the vehicle, surrounding the slewing bearing unit externally with a rotation blocking body that is movable in the radial direction to the axis of rotation of the slewing bearing and with an actuating body that has a wedge surface extending perpendicular to the direction of movement of the blocking body rotation.

From the document EP 2261066, a tilting towing device is known, which, in contrast to the device according to DE 19848487, has a guide body in the shape of a hollow cylinder, in the wall of which radial through-guides are formed for guiding the body for blocking rotation. Such an arrangement of the slewing bearing body has a simple spatial structure of the slewing bearing unit and easy sealing of the slewing bearing because the slewing bearing outer body does not make any movements in the axial direction of the rotation axis. However, the tilting towing device has a large number of parts and large operating forces are required to operate it due to friction between the individual parts. The device has a lot of weight.

The disadvantage of tilting traction devices according to the current state of the art is, in particular, the necessity to overcome the frictional forces that arise between the wedge surfaces of the control body and other parts and make it difficult to control the blocking device. The disadvantage of tilting towing devices according to the current state of the art is also their complexity and weight.

The essence of the invention

The goal of the invention is a tilting towing device that will not use frictional forces between parts, will have a simpler construction and easy operation with little control force. Disadvantages of the prior art are substantially eliminated and the aim of the invention is met by a hinged towing device, which includes a suspension ball at one end of the support arm, the other end of which is equipped with a suspension eye with a hole that forms the outer ring of the bearing, mounted rotatably on a cylindrical guide sleeve equipped with a frontal suspension by a flange firmly connected to the supporting plate of the vehicle, for

- 1 CZ 2020 - 397 A3 rotation of the support arm between the working position for hanging the trailer of a motor vehicle on the suspension ball and the rest position for folding the support arm under the bumper of the motor vehicle, while the position of the outer ring of the bearing can be locked by a blocking body, which is movably arranged in a continuous radial a guide formed in the wall of the cylindrical guide sleeve for engagement with the inner radial recess of the outer ring of the bearing, and is controllable by a control body mounted movably in the guide sleeve according to the invention, the essence of which is that the blocking body is elongated in shape with one end for engagement with the inner radial by selecting the outer ring of the bearing and with the other end rotatably mounted in the control body.

Advantageously, the blocking body at the end placed in the control body can have a round shape matching the shaped recess of the control body. Advantageously, the control body can be mounted in the guide sleeve displaceably in the direction of the axis of rotation of the outer ring of the bearing, and the blocking body can be mounted in the control body rotatably around an axis parallel to the plane of rotation of the outer ring. Advantageously, the control body can be mounted in the guide sleeve rotatably about an axis perpendicular to the plane of rotation of the outer ring of the bearing, and the blocking body can be mounted in the control body rotatably about an axis parallel to the axis of the control body. Advantageously, the blocking body at the end for engagement with the inner radial recess of the outer ring of the bearing can be formed by a round head mounted rotatably and slidingly in the radial guide in the wall of the cylindrical guide sleeve.

Advantageously, the blocking body mounted rotatably in the control body can have an elongated shape consisting of a head mounted rotatably and slidingly in a radial guide and a heel rotatably connected to the control body. Advantageously, the heel for the rotary connection with the control body can have a round shape matching the shaped recess of the control body. Advantageously, for the rotary connection with the control body, the heel can be equipped with a pivot mounted rotatably in the control body. Advantageously, the blocking body can be connected to the control body rotatably around an axis parallel to the plane of rotation of the outer ring of the bearing, and the control body is mounted in the guide sleeve displaceably in the direction of the axis of rotation of the outer ring of the bearing. Advantageously, the blocking body can be connected to the control body rotatably about an axis perpendicular to the plane of rotation of the outer ring of the bearing, and the control body can be mounted in the guide sleeve rotatably about an axis perpendicular to the plane of rotation of the outer ring of the bearing. Advantageously, the control body can be formed by a shaft mounted in the axial guide of the guide sleeve in a sliding manner with a tolerance for shaft swing. Advantageously, the head and foot of the blocking body can be of one piece. Advantageously, the head and heel can be separable parts of the blocking body, connected to each other by means of a connecting pin. Advantageously, the blocking body mounted rotatably in the wall of the cylindrical guide sleeve can have an oval shape, one part of the circumference of which forms a circumferential protrusion for engagement with the inner radial recess of the outer ring, and the opposite part of the circumference is equipped with a transmission means for converting the sliding or rotary movement of the control body into a rotary movement of the blocking body. Advantageously, the transmission means can be formed by the teeth of the blocking body and the teeth of the control body.

Clarification of drawings

The tilting towing device is explained with the help of drawings, in which Fig. 1 shows a view of the tilting towing device according to the prior art, Fig. 2 a longitudinal section of the tilting towing device according to the invention, Fig. 3 a view of the assembly of the guide sleeve, blocking bodies and control shaft bodies according to the invention, Fig. 4 view of the assembly of the outer ring of the bearing, control body and locking bodies of the locking device according to the invention,

- 2 CZ 2020 - 397 A3 Fig. 5 view of the storage of the blocking bodies in the control body according to the invention and Fig. 6 longitudinal section of the tilting traction device with the blocking body stored in the guide sleeve according to the invention.

Examples of implementation of the invention

The tilting towing device according to the state of the art shown in Fig. 1 consists of a support arm 5, at one end of which a suspension ball 4 is formed and the other end of which is provided with a suspension eye 6 with a hole not shown. The suspension eye 6 forms the outer ring of the bearing, which is rotatably mounted on the cylindrical guide sleeve 12. The cylindrical guide sleeve 12 passes through the opening of the suspension eye 6 and is equipped at one end with a front suspension flange 14, which is firmly connected to the support plate 2 by means of screws not shown. Support plate 2 is firmly connected by welding to the transverse support rod 1 attached at its ends to the vehicle frame. The suspension eye 6, which forms one piece with the arm 5, is swingable between two positions of the support arm 5, namely between the working position in which the suspension ball 4 is tilted in front of the rear bumper of the motor vehicle for suspending the motor vehicle trailer and the rest position in which it is support arm 5 with suspension ball 4 folded under the bumper of the motor vehicle. The position of the suspension eye 6, which forms the outer ring of the bearing, and therefore also the position of the support arm 5 with the suspension ball 4, can be locked in both the working and rest positions by means of an unillustrated locking device 11 arranged in the guide sleeve 12 and controlled by the control body 31 passing through the guide sleeve 12.

According to Fig. 2, a rotatably guiding sleeve 12 is placed in the opening of the outer ring 8 of the bearing. In the inner circumference of the outer ring 8 of the bearing, radial recesses 9 are created axially symmetrical to the axis of symmetry y of the outer ring 8 of the bearing, for example in the form of axially guided grooves. The cylindrical guide sleeve 12 is terminated on one side by a hanging flange 14 with holes 13 for the fixed connection of the guide sleeve 12 with the non-illustrated support plate shown in Fig. 1. In the cylindrical wall of the guide sleeve 12, through radial lines 16 are formed in the radial direction, pointing to the inner radial recess 9 of the outer ring 8 of the bearing. Blocking bodies 21 are arranged in the radial guides 16 for engagement with the outer ring 8 of the bearing. If the blocking body 21 engages in the inner radial recess 9 of the outer ring 8 of the bearing, the outer ring 8 of the bearing is locked by the engagement of the blocking body 21 with the outer ring 8 of the bearing. A through axial recess 17 is formed in the guide sleeve 12, in which the control body 31 for controlling the blocking body 21 is arranged. The guide sleeve 12 has a hollow cylindrical shape and the control body 31 has the shape of a shaft that passes through the guide sleeve 12. The guide sleeve 12 is in one piece or is fixedly connected to the axially arranged ring 12a, which has an axial opening with an axial guide 15 for the shaft of the control body 31. Advantageously, the shaft of the control body 31 can be accommodated in the axial guide 15 with such a tolerance and the axial guide 15 can have such a rounding that the mounting of the shaft of the control body 31 is swingable. This is especially advantageous for the axial sliding movement of the control body 31, because the swing of the shaft of the control body 31 compensates for any misalignment of the guide sleeve 12 and the control body 31. The blocking bodies 21 have an elongated shape, consisting of a head 22, a body 23 and a heel 24, which are made from one piece. The head 22 and the heel 24 have a spherical shape. The head 22 passes into the body 23 or directly into the heel 24. which have a smaller diameter in the cross-section of the blocking body 21, or the head 22 to allow the tilting of the blocking body 21 in the continuous radial guide 16 during the radial displacement of the head 22. The head 22 of the blocking body 21 is arranged in the continuous radial guide 16 of the guide sleeve 12. With a heel 24, the blocking body 21 emerges from the continuous radial guide 16 and extends into the axial cylindrical recess 17 of the guide sleeve 12. The shaft of the control body 31 has shaped recesses 32 in the areas opposite to the radial guides 16 for rotatable mounting of the heel 24 of the blocking body 21 · To secure the heel 24 in the shaped recess 32, an axially fixed axial ring 34 defining the position of the heel 24 of the blocking body is advantageously arranged on the shaft of the control body 31. According to Fig. 2, the blocking bodies 21 are rotatably mounted in the control body 31. As a result of the rotatable bearing of the heel 24 of the blocking body

- 3 CZ 2020 - 397 A3 in the control body 31, during rotation or axial sliding movement of the control body 31, the head 22 of the blocking body 21 is pushed in or out in the radial direction into or out of the radial guide 16. When the control body 31 is rotated, the head 22 of the blocking body body 21 rotates in a plane perpendicular to the axis of rotation v, and during the axial sliding movement of the control body 31, the head 22 of the blocking body 21 rotates in an axial plane passing through the axis y. The blocking body 21 can be connected to the control body 31 rotatably around the axis β parallel to the plane of rotation of the outer ring 8 of the bearing, and the control body 31 is mounted in the guide sleeve 12 displaceably in the direction of the axis γ of rotation of the outer ring 8 of the bearing. The blocking body 21 can be connected to the control body 31 rotatably around the axis and perpendicular to the plane of rotation of the outer ring 8 of the bearing, while the control body 31 is mounted in the guide sleeve 12 rotatably about the axis and perpendicular to the plane of rotation of the outer ring 8 of the bearing. The spherical head 22 of the blocking body 21 may advantageously be tapered or flattened in its apex region. Advantageously, the head 22 and the heel 24 can be formed as separable parts, connected by a body 23 in the form of a connecting pin. The radial guides 16 can have a cylindrical, square, rectangular or other shape in cross-section, allowing simultaneous sliding movement and rotation of the blocking body 21 in the radial guide 16.

According to another embodiment of the tilting traction device according to the invention, the blocking body 21 can be rotatably connected to the control body 31 by means of a pin passing through the heel 24 and stored in the control body 31. In the case of controlling the blocking body 21 by rotating the control body 31, the pin will pass through the heel 24 in an axis parallel to by the γ axis of the shaft of the control body 31. In the case of control of the blocking body 21 by sliding movement of the control body 31, the pin will pass through the heel 24 in an axis perpendicular to the axial plane of the shaft of the control body 31, which passes through the y axis of the control body 31. According to another possible embodiment of the tilting traction device according to according to the invention, the blocking body 21 can have the head 22 knocked down in its top part and be rotatably connected to the guide sleeve 12 around a pin, the a axis of which passes through the head 22 and is parallel to the y axis of the control body 31, and the control body 31 will be rotatable and equipped with a stop surface for force contact with the heel 24 of the blocking body 21 in the direction of the β axis passing through the heel 24 and perpendicular to the plane formed by the axes a and t. In the radial position of the blocking body 21, the head 22 will not interfere with the radial recess 9 of the outer ring 8 of the bearing due to the offset in the top part, but after turning the control body 31, the off-peak part of the head 22, which does not exhibit offset, will interfere with the radial the recess 9 and the engagement with the outer ring 8 stops the rotation of the guide sleeve 12 relative to the outer ring 8. According to another possible embodiment of the tilting traction device according to the invention, the blocking body 21 can have the head 22 knocked down in its top part and be rotatably connected to the guide sleeve 12 around the pin, whose β-axis passes through the head 22 and lies in a plane perpendicular to the γ-axis in the tangent direction to the circle centered on the y-axis, and the control body will be provided with a stop surface for forceful contact with the heel 24 of the blocking body 21 when moving in the direction of the v-axis of the control body. In the radial position of the blocking body 21, the head 22 will not engage in the radial recess 9 of the outer ring 8 of the bearing due to the offset in the top part, but after turning the control body 31, the off-peak part of the head 22, which does not show an offset, will engage the radial recess 9 and engage with the outer ring 8 stops the rotation of the guide sleeve 12 relative to the outer ring 8.

According to Fig. 3, the blocking device 11 of the tilting traction device according to the state of the art consists of a cylindrical guide sleeve 12, blocking bodies 21 placed in through radial lines 16 and controlled by a control body 31 in the shape of a shaft and an outer bearing ring, not shown, forming a suspension eye 6 shown in Fig. 1. The cylindrical guide sleeve 12 is provided at one end with a suspension flange 14 with axial flange holes 13 for attachment to the support plate 2 shown in Fig. 1. At the other end, the cylindrical guide sleeve 12 is rigidly connected in the axial direction to a ring 12a provided with a hole for accommodating the control body 31 in the shape of a shaft, which passes through the opening of the ring 12a. The ring 12a can advantageously be made in one piece with the cylindrical guide sleeve 12. Through radial guides 16 are formed in the wall of the guide sleeve 12, in which the blocking bodies 21 are movably mounted. The blocking bodies 21 can be pushed into engagement with the radial recesses, which are formed in the inner cylindrical surface of the suspension eye 6 shown in Fig. 1 and forming the outer ring of the bearing. The blocking bodies 21 can be controlled by the control body 31 mounted movably in the guide sleeve 12, either rotatably or slidingly.

- 4 CZ 2020 - 397 A3

According to Fig. 4, the U-shaped support arm 5 is equipped at one end with a suspension ball 4, and at the other end is provided with a suspension eye 6 arranged inclined to the plane of symmetry of the support arm 5. In the opening 7 of the suspension eye 6 forming the outer ring 8, the bearings are internal radial recesses 9 in the form of axially guided grooves are formed in the inner cylindrical wall. The heads 22 of the locking bodies 21 extend into the inner radial recesses 9, the heels 24 of which are rotatably mounted in the control body 31. For the sake of clarity, the guide sleeve arranged between the outer ring 8 of the bearing and the control body 31 is not shown in Fig. 4. The blocking bodies 21 pass through by the radial lines of the guide sleeve, not shown, which is shown in Fig. 3.

Fig. 5 shows a detail of the rotary mounting of the feet 24 of the locking bodies 21 in the shaft control body 31. The heel 24 can be seated in the control body 31 using a spherical recess in the control body 31 or by means of a pin (not shown) passing through the heel 24 and stored in the control body 31. The blocking body 21 can be connected by the heel 24 to the control body 31 rotatably about an axis and parallel to the longitudinal axis of symmetry of the control body 31 or rotatably about the β-axis lying in a plane perpendicular to the v-axis in the tangent direction to the circle centered on the j-axis. control of the blocking body 21 by rotating the control body 31, the pin will pass through the heel 24 in the axis and parallel to the axis in the shaft of the control body 31. In the case of control of the blocking body 21 by sliding movement of the control body 31, the pin will pass through the heel 24 in the axis β lying in a plane perpendicular to the axis v in the tangent direction to the circle with the center in the v axis. An axial groove 37 is formed on the shaft of the control body 31 to prevent unwanted rotation of the part of the control body 31 during its sliding movement.

According to Fig. 6, the control body 31 in the shape of a shaft is mounted at one end rotatably in the guide sleeve 12 and at the other end rotatably in the axial guide 15 of the ring 12a connected firmly to the guide sleeve 12. The blocking body 21 is arranged to swing in a continuous radial guide 16 formed in the guide sleeve 12. The locking body 21 has a flat oval cam shape, which is rotatably mounted on a pin 27 fixed firmly in the wall of the guide sleeve 12. The axis of the pin 27 is parallel to the axis of the shaft of the control body 31. One part of the circumference of the oval locking body 31 forms a peripheral protrusion 18 cams for engagement with an internal radial recess 9 of the outer ring 8 of the bearing. The part of the cam circumference opposite to the circumferential protrusion 18 has a circular shape and is equipped with a transmission device formed, for example, by front gearing 29, which engages with front gearing 39 formed on the circumference of the shaft of the control body 31. By turning the shaft of the control body 31, the cam blocking body 21 turns so , that the peripheral projection 18 engages in the inner radial recess 9 into engagement with the outer ring 8 of the bearing or is pushed out of the inner radial recess 9 out of engagement with the outer ring 8 of the bearing.

According to another embodiment of the tilting traction device according to the invention, the pin 27 can be arranged in a plane perpendicular to the γ axis of symmetry of the control body 31 in the tangential direction to the circle with the center in the axis i to convert the sliding movement of the control body 31 to the rotary movement of the blocking body 21 in the axial plane passing axis in the control body. The shaft-shaped control body 31 is provided at both ends with axial bores 35, 36 with a thread for possible connection with means not shown for turning or moving the control body 31.

Industrial applicability

The tilting towing device can be used especially on motor vehicles, for connecting trailers to the support ball.

Claims (5)

PATENT CLAIMS A tilting towing device, in particular for a motor vehicle trailer, comprising a suspension ball (4) at one end of a support arm (5), the other end of which is provided with a suspension eye (6) with an opening (7) forming an outer ring (8). bearings rotatably mounted on a cylindrical guide sleeve (12) provided with a front suspension flange (14) fixedly connected to the vehicle support plate (2), for rotating the support arm (5) between a working position for suspending the motor vehicle trailer on the suspension ball (4) and the rest position for folding the support arm (5) under the bumper of the motor vehicle, the position of the outer ring (8) of the bearing being lockable by a locking body (21) which is movably arranged for engagement with the inner radial recess (9) of the outer ring (8). through a radial guide (16) formed in the wall of the cylindrical guide sleeve (12), and is controllable by an actuating body (31) slidably and / or rotatably mounted in the guide sleeve (12), characterized in that the locking body (21) is elongated s jed one end for engagement with the inner radial recess (9) of the outer ring (8) of the bearing and with the other end rotatably mounted in the control body (31). Tilting towing device according to Claim 1, characterized in that the locking body (21) has a round shape at the end accommodated in the actuating body (31), matching the shaped recess (32) of the actuating body (31). Tilting towing device according to Claim 1 or 2, characterized in that the actuating body (31) is mounted in the guide sleeve (12) slidably in the direction of the axis of rotation (v) of the outer bearing ring (8) and the locking body (21) is mounted in the control body (31) rotatably about an axis (β) parallel to the plane of rotation of the outer ring (8). Tilting towing device according to Claim 1 or 2, characterized in that the actuating body (31) is mounted in the guide sleeve (12) rotatably about an axis (γ) perpendicular to the plane of rotation of the outer bearing ring (8) and the locking body (21). ) is mounted in the control body (31) for rotation about an axis (a) parallel to the axis (γ) of the control body (31). Tilting towing device according to Claim 1 or 2, characterized in that the locking body (21) is formed at the end for engaging the inner radial recess (9) of the outer ring (8) of the bearing by a round head (22) mounted rotatably and slidably in a radial guide (16) in the wall of the cylindrical guide sleeve (12).