SE504716C2 - Device for hanging a tiltable bonnet at a vehicle frame - Google Patents

Abstract

The bent leaf spring (22) at its one end (55) is rotatably located on the frame (4) and at its other end (53) is located on the bonnet (8). The two ends of the leaf spring are located on the respective parts by means of rotary pins (62) which axially extend in the vehicle cross direction. The leaf spring comprises a spring part (52), and outer socket at each end, an inner socket through which the rotary pins are arranged and an elastic bush pressed between the outer and inner sockets. The leaf spring two ends are prevented from being moved relatively to one another longer than a predetermined distance by means of a movement limiting component (24). The one rotary pin of the leaf spring is arranged to run in an elongated hole-shaped track (68) through a plate-shaped part (66) in the movement limiting component. The plate-shaped part is rotatably located in the bonnet or frame, i.e. in the part other than that in which the rotary pin is located.

Description

Prevents the hood from tipping too far forward, which can lead to damage to the hood or other nearby parts, and prevents it from falling back from the open position, which can cause serious injuries, for example during service or other supervision. Such a tipping stop device increases the above-mentioned problems of pacing and mounting.

Purpose of the invention.

The purpose of the invention is to provide a cheap, robust, function-proof and space-saving spring arrangement when suspending a tiltable hood at a vehicle frame.

In this way, the device according to the invention is characterized by the presence of a leaf capercaillie clamped between the hood and the frame according to claim 1. This arrangement provides a solution which is compact and comprises few parts, all of which are durable. Claims 2 and 3 state advantageous detailed designs of feather fixtures, including elastic bushings for absorbing vibrational movements.

Claims 4-6 state advantageous embodiment feet with a movement-limiting member which prevents the hood from tipping too far forward and falling back from the open position.

Claim 7 states a bulge shape with a separate fastening portion for the attachment of both the hood and the spring to the frame. In this way, fi edema can be pre-assembled at the hood, after which they are mounted at the frame as a continuous unit during the final assembly.

By storing the hood at the frame with an elastic bushing according to claim 8, the bushing can be dimensioned to withstand rotations within the actual tipping area, the need for a separate bearing is eliminated, which reduces the number of components. Furthermore, the bushing can absorb the relative movements that can be applied to the hood from the cab if it is suspended by a f vid m fifl.

Claim 9 describes an advantageous arrangement where the hood is mounted with two substantially identical spring units fixed to a respective longitudinal frame side beam. In this way a stable arrangement is obtained with the constituent components arranged at a position which is advantageous from a space point of view. The further features and advantages of the invention will be apparent from the accompanying description of an exemplary embodiment. The description is made with reference to the attached figures.

Figure drawing.

Figure 1 shows a schematic view of a so-called torpedo-built truck.

Figure 2 shows an inventive spring arrangement and a part of a bonnet before assembly.

Figure 3 shows the spring arrangement mounted on a head part before attachment to the frame (the hood itself is not shown for increased clarity).

Figure 4 shows a pre-assembled hood comprising the spring arrangement.

Description of an embodiment.

The description mentions certain directional concepts. These relate to the vehicle's normal direction of travel and closed hood.

Figure 1 shows a so-called torpedo-built truck 2 where its engine (not shown) is arranged at a vehicle frame 4 in an engine compartment 6. The engine compartment 6 is covered by a bonnet 8 which is tiltable forward in order to enable access to parts in the engine compartment. 6 for service or other supervision. A cab 10 is arranged at the vehicle frame 4 behind the engine compartment 6 and the bonnet 8.

The cab 10 may be suspended from the frame at its rear edge and / or front edge.

The bonnet 8 is tiltably arranged at the frame 4 where tilting takes place about an axis substantially in the transverse direction of the vehicle and located at the lower front edge 12 of the hood 8. The rear end of the hood is locked at the cab 10 with two locks 14.

When tilting the hood 8, the locks 14 can be opened with an operating handle (not shown) located in the cab 10. Then the hood 8 is tilted forward. To facilitate tilting, a spring arrangement 16 according to the invention is arranged between the hood 8 and the frame 4. The spring arrangement 16 is substantially symmetrical about a vertical plane in the longitudinal direction of the vehicle. In order to facilitate access to the parts in the engine compartment 6, an entrance 18 is arranged in front of the front wheel 20. The spring and hood suspension arrangement according to the invention is now described in more detail with reference to Figures 2-4 which show different phases in the mounting sequence. The figures only show the left storage arrangement of the hood, but as previously mentioned, the arrangement is analogous on the right side.

As essential overall parts, the hood 8, a spring member 22 in the form of a leaf spring, a movement-limiting member 24, a fastening portion 26 and a frame part 28 are included. The frame part 28 may consist of a longitudinal frame side beam or in this case a bracket arranged therewith. The hood 8 is rotatably mounted at the mounting portion 26 and the leaf spring 22 is rotatably mounted at both the hood 8 and the mounting portion 26. All relative rotation takes place about parallel axes in the transverse direction of the vehicle. The mounting portion 26 is fixed to the frame 8. The movement limiting member 24 prevents the hood 8 from tipping too far and falling back from the open position.

The hood 8 is mounted at the fastening portion 26 by means of a first elastic bushing 30, preferably of rubber. The bushing 30 comprises a central part 32 with a cylindrical circumferential surface pressed into an outer sleeve 34 of the fastening portion 26, and two axially outer substantially circular discs 36 rotatably pressed between the central part 32 of the bushing and two ends 38 of a hood-fixed bracket 40. The pressing is done by means of a central through-screw 42 with a cooperating nut 44. Thus, all relative movement that occurs during tipping is absorbed as rotation in the bushing 30.

As can be seen from the grooves 2 and 4, the central part 32 of the bushing is formed with recesses 46, which makes it softer longitudinally and transversely than in height. This is because the bushing 30 must also be able to accommodate fidressing movement in the longitudinal direction of the vehicle. This suspension movement can be applied to the hood 8 from behind of vehicles with a fi sprung suspension cab 10.

The mounting portion 26 and the hood 8 are further connected to each other by the blade spring 22 which is rotatably attached to the mounting portion 26 between two vertical ridges 48 arranged behind the first bushing 30, and rotatably attached to the hood mounting bracket 40 at two rearwardly directed ridges 50 arranged obliquely above the first. the bushing 30.

Leaf spring 22 comprises a curved spring part 52 in the form of a rearwardly directed and nearly 180 ° curved iron bar, here with a substantially rectangular cross-section. At the upper end 53 of the spring part 52 there is an outer sleeve 54 and a concentrically arranged inner sleeve 56 between which an elastic bushing 58 is preferably pressed in, preferably of rubber. The inner sleeve 56 is mounted at the ends 50 with an upper transverse pivot pin 60 in the form of a screw with cooperating nut 64.

The lower end 55 of the spring part 52 is formed analogously with a lower transverse pivot pin 62 in the form of a screw with cooperating nut (not shown) arranged at the ends 48.

The upper and lower bushings 58 are freely mounted at respective portions 48,50 and are not arranged to accommodate rotational movement. The bushes 58 have the sole task of absorbing the vibrational movements that occur during ordinary operation.

The movement restricting means 24 comprises a disc-shaped part 66 with an elongate through groove-shaped hole 68. The disc-shaped part 66 is rotatably mounted at the test portion 26 in such a way that the lower pivot pin 62 also extends through a second hole (not shown) through the disc-shaped part 66. Thus, both the lower end of the blade edge 22 and the disc-shaped portion 66 are mounted at the mounting portion 26 with the same pivot 62.

The upper pivot pin 60 is similarly arranged through the elongate hole 68. When tipping the cab 10, the pivot pin 60 thus runs in the groove 68. The pivot pin 60 has a skull 70 whose correct axial position is suitably determined by a spacer sleeve 72 between the skull 70 and the hood fixed fl änsen 50.

Thus, when the hood is closed, the upper pivot pin 60 is located in the lower part of the groove 68 and when tipping, the pin 60 moves upwards in the groove 68 until it abuts at its upper end. This prevents the hood 8 from tipping forward further than to this predetermined position.

The groove 68 is substantially L-shaped with a rearwardly directed groove portion 74. By guiding the upper pivot pin 60 into this groove portion 74, the hood 8 is locked in its tilted position and prevented from falling back. The groove part 74 thus defines a stopping position for the pivot pin 60. A similar rearwardly directed groove part can advantageously also be arranged at the lower end, which enables securing when the hood is closed, which prevents the hood 8 from opening during operation, for example due to difficult locks 14 in difficult operating conditions. .

A second spring member 76 causes rotation of the disc-shaped part 66 (counterclockwise according to Figure 2), which means that the upper pivot pin 60 is automatically guided into the stop position 74. A mechanical actuator (not shown), suitably in the form of a wire arranged at a fastening point 80 of 50 504 716 the disc-shaped part 66, is arranged to be able to influence the disc-shaped part 66 rotation against the action of the second spring means 76 in order to be able to release the pivot pin 60 from the stop position 74. The operating means should be easily accessible from the outside of the vehicle, in this case the other end of the wire can be arranged in the vicinity of the steps 18 in front of the front wheel 20, suitably in the engine compartment 6.

In an arrangement with a fuse in both end positions, the lower fuse can be designed so that some tipping is allowed when the lock 14 is opened in order to enable access to an operating handle located in the engine compartment 6. Furthermore, the arrangement with L-shaped grooves and actuators only needs to be at one of the two storage locations of the hood 8 at the frame 4.

The blade spring 22 is in this case arranged so that it is dry-tight attached when the hood 8 is closed. For best function, its equilibrium position must be assumed when the hood is tilted further than its equilibrium position, otherwise the spring counteracts the opening of the hood. For maximum safety, the blade edge should always have some preload or at least arranged so that it never acts on the hood towards the closed position with appreciable force. However, the preload should be chosen so that a sufficient power assistance is obtained without closing the hood appreciably.

Mounting of the hood 8 at the frame 4 is as follows: In a first step the central part 32 of the first bushing is pressed into the sleeve 34 of the fastening portion and the lower ends 55,24 of the leaf spring and the movement limiting member are mounted at the fastening portion 26 with the lower pivot pin 62 and its cooperating locknut (not shown).

In a second step, the hood 8 is connected to the mounting portion 26. This is done by pressing the first bushing 30 including the discs 36 between the grooves 38 and securing them in a rotationally fixed manner with the screw 40 and the nut 44. It is important here that the hood 8 and the mounting portion 26 are mutually positioned. according to Figure 4, ie in the position where they are intended to be in a fully assembled condition and with the hood closed. The reason for this is that since the tilting movement is taken up as rotation in the bushing 30, its strength and service life are increased if it is in its equilibrium position during normal operation, i.e. with the hood closed, which is achieved by mounting according to said method.

In a third step, the respective upper end 53, 24 of the leaf spring and the movement limiting member 53 are stored at the hood-fixed bracket 40 by the upper pivot pin 60 being threaded through the hole 68 and the upper bushing 58 and secured with the pivot locking nut 64 of the pivot pin 60.

Leaf spring 22 will herewith actuate the hood 8 towards the open position relative to the mounting portion 26.

In a fourth step, the two fastening portions 26 are applied to cooperating surfaces 77 on a respective longitudinal frame side beam 28 and are thereby secured with a respective screw joint 78, in this case comprising three screws each.

In this way a device has been provided which is robust and resistant to vibrations by the heavily biased blade edema. The arrangement is also space-saving as all storage points are close to each other. The latter also means that a simple mounting method can be achieved by a pre-mounting at a relatively small fastening portion which can be mounted at the frame.

This fastening part can suitably be designed so that a standardized frame can be used with a fist part arranged so that either, as in the case of a torpedo-built car, it can receive a fastening part, or in the case of a developed car a corresponding cab suspension arrangement.

A number of alternative embodiments may occur, for example the number of storage points and associated blades may vary. Furthermore, the hood's storage at the fastening part can consist of a customary bearing if fi spring movement does not need to be accommodated. The movement limiting means may conversely be slidably mounted to the frame and rotatably mounted to the hood, or have a large number of alternative shapes, for example a wire of predetermined length which in some way connects the hood to the frame.

As far as the device according to the invention is concerned, the hood, blades and the movement-limiting member need not be attached to a frame-fixed fastening portion. They can be attached directly to the frame or to separate fastening parts vid xdered to the frame in the traditional way.

As far as the mounting method is concerned, the spring arrangement can first be stored at a hood-fixed bracket which is then fixed to the hood. Furthermore, the above-mentioned sequence of steps only applies to the mounting of one storage point. The second storage rack can be mounted in time at the same time or sequentially but with the same mutual step fi iljd. The essential thing is to first mount the various spring frames and fastening parts to the hood, which are then secured as a single continuous part at the frame. 504 716 Furthermore, the term frame includes any parts mounted on the frame. Advantageously, for example, the fastening portion can be fastened to a frame-fixed base bracket, including fastening points for other parts such as control apparatus, cooler or the like.

Claims (9)

504,716 Claims. 1. Device for suspending a tiltable bonnet (8) at a vehicle frame (4) where at least one ladder member (22) is arranged between the hood (8) and the frame (4), characterized in that the spring member (22) is constituted by a curved leaf spring which at its one end (55) is rotatably mounted at the frame (4) and at its other end (53) rotatably mounted at the hood (8), which spring (22) is pre-tensioned when the hood (8) is in the closed position . Device according to claim 1, characterized in that both ends (53, 55) of the leaf spring are mounted at the respective part (4, 8) by means of a respective pivot pin (60, 62) which axially extends substantially in the transverse direction of the vehicle. Device according to claim 2, characterized in that the leaf spring (22) comprises a capercaillie part (52), an outer sleeve (54) arranged at the respective end (53,55), a respective inner sleeve (56) through which the pivot pins (60, 62) are arranged and a respective elastic bushing (58) is pressed between the respective outer and inner sleeve (54,56). Device according to one of Claims 1 to 3, characterized in that both ends (53, 55) of the blade are prevented from being displaced relative to one another for longer than a predetermined distance by means of a movement-limiting member (24). Device according to claim 4, characterized in that one pivot pin (60) of the leaf cap is arranged to run in an elongate hollow groove 68 through a disc-shaped part (66) of the movement-limiting member (24), which part (66) is rotatably mounted at that of the hood (8) or the frame (4) where the other pivot pin (62) is mounted. Device according to claim 5, characterized in that the groove (68) comprises at least one stopping position (74) for the pivot pin (60), that a second spring means (76) influences the movement-limiting means (24) rotation from the pivot pin (60) in order to ensure that the pivot pin (60) assumes the stop position (74), and that a mechanical actuator (not shown), preferably a wire, can influence the movement limiting means (24) to rotate towards the pivot pin (60) in order to fl move the pivot pin (60) from the stop position (74), which actuator is easily accessible from the outside of the vehicle. 10 504 716 7.. Device according to one of Claims 1 to 6, characterized in that both the hood (8) and the frame-bearing end (55) of the leaf spring are rotatably mounted at the frame (4) via a common frame-fixed test portion (26). Device according to one of Claims 1 to 7, characterized in that the hood (8) is mounted on the frame (4) by means of an elastic bushing (30). Device according to one of Claims 1 to 8, characterized in that! in that two leaf springs (22) are arranged substantially symmetrically between the hood (8) and a respective longitudinal frame side beam (28) where the plane of symmetry is a vertical and extends through the middle of the vehicle in its longitudinal direction.