Wheel for a land vehicle and land vehicle with at least one wheel

Abstract

The invention relates to a wheel for a land vehicle, in particular for a vehicle used in agriculture and forestry, comprising a rim and a pneumatic tire mounted on the rim, wherein the rim has at least one compressed air reservoir with at least one inlet valve leading into an air chamber of the pneumatic tire. The invention also relates to a land vehicle with at least one such wheel. The wheel and the land vehicle according to the invention are characterized in that the rim has at least one compressor fixed to its wheel disc, and the compressor is connected to the compressed air reservoir via at least one check valve.

Description

[0001] The invention relates to a wheel for a land vehicle, in particular for a vehicle used in agriculture and forestry, comprising a rim and a pneumatic tire mounted on the rim, wherein the rim has at least one compressed air reservoir with at least one inlet valve leading into an air chamber of the pneumatic tire. The invention further relates to a land vehicle with at least one wheel of the type mentioned above.

[0002] In conventional wheels or land vehicles, the compressed air reservoir is part of a tire pressure control system (TPMS), which allows the tire pressure to be adjusted from the driver's cab to suit different driving surfaces. This adjustment essentially means increasing the tire pressure on paved roads and decreasing it off-road. It is well known that such tire pressure control systems make a significant contribution to environmental protection because they help reduce soil compaction, damage to vegetation, and fuel consumption. Common tire pressure control systems feature a centrally located compressor to which the pneumatic tires are connected via individual lines. This regularly presents the challenge of transporting compressed air from static parts of the vehicle body to the rotating pneumatic tires.However, rotary feedthroughs used for this purpose are problematic for the known tire pressure control systems, as they are either exposed to an increased risk of damage due to large shaft seals and peripherally running pipe sections, or are comparatively expensive due to air lines integrated into the wheel axles and other components.

[0003] The invention is therefore based on the objective of demonstrating a running wheel and a land vehicle of the aforementioned types which can be operated with a tire pressure system in a particularly reliable and yet cost-effective manner.

[0004] This problem is solved according to the invention with a wheel having the features of claim 1 or a land vehicle having the features of claim 7. Advantageous embodiments of the invention are specified in the dependent claims which refer back to these claims.

[0005] The impeller and the land vehicle according to the invention are characterized in that the rim has at least one compressor fixedly mounted on its wheel disc, and the compressor is connected to the compressed air reservoir via at least one check valve. Consequently, the compressor is an integral part of the impeller according to the invention, so that rotary unions and long lines connecting the rotary unions to a central compressor can be advantageously dispensed with. The rim and the compressor thus form an advantageously compact unit, in which the rim can reliably protect the compressor from external forces and the ingress of contaminants, acting like a solid housing.The compressors installed in the wheels of a land vehicle can be controlled mechanically or electrically, but especially wirelessly electrically via a remote control from a driver's cab.

[0006] According to a first further development of the invention, the air chamber of the pneumatic tire has at least one exhaust valve mounted on the rim. The exhaust valve serves to reduce the tire pressure and can be operated mechanically or electrically, but in particular wirelessly via a remote control.

[0007] In a further development of the invention, the compressor is a multi-cylinder reciprocating compressor, the pistons of which each have piston rods oriented towards the wheel axle. The compression power required for the convenient operation of a tire pressure control system at the compressor is preferably achieved via the number of pistons installed in the reciprocating compressor. This allows the use of particularly compact pistons and facilitates the integration of the compressor into the wheel rim.

[0008] The piston rods of the reciprocating pistons drive the compressor. These rods run along an eccentric ring, which is fixed to the impeller's axle. The rotation of the impeller causes the rods to run along the stationary eccentric ring, and the eccentricity of this ring causes the rods to be actuated sequentially. The resulting reciprocating movements of the pistons ultimately perform the work required by the compressor to fill the compressed air reservoir.

[0009] According to another embodiment of the invention, the piston rods of the reciprocating pistons have roller slides arranged at their free ends, which are positively guided in an eccentrically designed guide track of the eccentric ring. Thus, both the upward and downward movements of the reciprocating pistons are generated by the roller slides rotating in the guide track of the eccentric ring. However, it is fundamentally within the scope of the invention to design the reciprocating compressor in the manner of a radial engine, wherein the reciprocating pistons are then connected to a spherical bearing ring via a main connecting rod and several auxiliary connecting rods, and the spherical bearing ring rotates on the journal of a central crankshaft.

[0010] To enable the compressor to be switched off when the compressed air reservoir is fully charged, a further embodiment of the invention proposes that the eccentric ring and the axle body of the impeller be connected to each other via a freewheel clutch. Switching off the compressor when the compressed air reservoir is fully charged advantageously extends the compressor's service life and reduces the fuel consumption of the land vehicle according to the invention.

[0011] An embodiment of the invention, from which further inventive features emerge, is shown in the drawing. It shows: Fig. 1: a sectional view of a wheel according to the invention; Fig. 2: a perspective representation of the in Fig. 1 of the depicted wheel; and Fig. 3: a side view of the in the Fig. 1 and Fig. 2 of the depicted wheel.

[0012] The Fig. Figure 1 shows a sectional view of a wheel according to the invention for a land vehicle, comprising a rim 1 and a pneumatic tire 2 mounted on the rim 1, wherein the rim 1 has a compressed air reservoir 3 with an inlet valve 5 leading into an air chamber 4 of the pneumatic tire 2. The rim 1 also has a compressor 7 fixedly mounted on its wheel disc 6, which is designed as a multi-cylinder reciprocating compressor and has ten pistons, each with a piston rod 9 oriented towards the wheel axle 8. The ten pistons of the compressor 7 are each connected to the compressed air reservoir 3 via a check valve (not shown). The air chamber 4 of the pneumatic tire 2 has an outlet valve 10 mounted on the rim 1. The piston rods 9 of the reciprocating pistons act as tappets, running on an eccentric ring 11 which is fixedly mounted on an axle body 8.1, which receives the wheel shaft 8, via a torque arm 12. In the Fig. In the embodiment shown in Figure 1, the piston rods 9 of the reciprocating pistons each have roller slides 13 arranged at their free ends, which are positively guided in a guide track 14 of the eccentric ring 11 which is formed eccentrically to the wheel shaft 8.

[0013] The Fig. 2 shows a perspective view of the in Fig. 1. Wheel shown. Identical components are marked with the same reference numbers.

[0014] The Fig. Figure 3 shows a side view of the [unclear text] in the Fig. 1 and Fig. Figure 2 of the wheel shows that the eccentric ring 11 has a guide track 14 that is eccentric to the wheel shaft 8. Identical components are designated with the same reference numerals.

Claims

[1] Wheel for a land vehicle, in particular for a vehicle used in agriculture and forestry, comprising a rim (1) and a pneumatic tire (2) mounted on the rim (1), wherein the rim (1) has at least one compressed air reservoir (3) with at least one inlet valve (5) leading into an air chamber (4) of the pneumatic tire (2), characterized by , that the rim (1) has at least one compressor (7) permanently mounted on its wheel disc (6), and that the compressor (7) is connected to the compressed air reservoir (3) via at least one check valve. [2] Wheel according to claim 1, characterized by , that the air chamber (4) of the pneumatic tire (2) has at least one exhaust valve (10) installed on the rim (1). [3] Wheel according to claim 1 or 2, characterized by, that the compressor (7) is a multi-cylinder reciprocating compressor, the pistons of which each have piston rods (9) aligned towards the wheel shaft (8). [4] Wheel according to claim 3, characterized by , that the piston rods (9) of the reciprocating pistons are tappets running on an eccentric ring (11), wherein the eccentric ring (11) is fixed to rotation on an axle body (8.1) of the impeller. [5] Wheel according to claim 4, characterized by , that the piston rods (8) of the reciprocating pistons have roller slides (13) arranged at their free ends, which are positively guided in an eccentrically designed guide track (14) of the eccentric ring (11). [6] Wheel according to claim 4 or 5, characterized by , that the eccentric ring (11) and the axle body (8.1) of the wheel are connected to each other via a freewheel coupling. [7] Land vehicle with at least one wheel comprising a rim (1) and a pneumatic tire (2) mounted on the rim (1), wherein the rim (1) has at least one compressed air reservoir (3) with at least one inlet valve (5) leading into an air chamber (4) of the pneumatic tire (2), characterized by , that the rim (1) has at least one compressor (7) permanently mounted on its wheel disc (6), and that the compressor (7) is connected to the compressed air reservoir (3) via at least one check valve. [8] Land vehicle according to claim 7, characterized by , that the air chamber (4) of the pneumatic tire (2) has at least one exhaust valve (10) installed on the rim (1). [9] Land vehicle according to claim 7 or 8, characterized by , that the compressor (7) is a multi-cylinder reciprocating compressor, the pistons of which each have piston rods (9) aligned towards the wheel shaft (8). [10] Land vehicle according to claim 9, characterized by , that the piston rods (9) of the reciprocating pistons are tappets running on an eccentric ring (11), wherein the eccentric ring (11) is fixed to rotation on an axle body (8.1) of the impeller. [11] Land vehicle according to claim 10, characterized by , that the piston rods (9) of the reciprocating pistons have roller slides (13) arranged at their free ends which are positively guided in an eccentrically designed guide track (14) of the eccentric ring (11). [12] Land vehicle according to claim 10 or 11, characterized by , that the eccentric ring (11) and the axle body (8.1) of the wheel are connected to each other via a freewheel coupling.

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