Breakdown assistance system

Abstract

The invention relates to a breakdown assistance system (1) having a compressor (100) that has a cylinder housing (110), wherein - the cylinder housing (110) surrounds a piston chamber (111) in which a piston is linearly displaceable, and - an outlet valve (112) that is arranged in the cylinder housing (110) permits a flow in a direction from the piston chamber to an outlet (113) of the cylinder housing (110) and blocks a flow counter to said direction, - the pressure measuring device (101) is attached to a pressure measuring connection (114) on the cylinder housing (110), - a damping channel (120) is arranged in the cylinder housing (110) between the outlet valve (112) and the pressure measuring connection (114), wherein the pressure measuring device (101) is fluidically connected to the outlet (113) by means of the damping channel (120) in order to measure and indicate a pressure at the outlet (113), wherein the damping channel (120) has a course that, starting from the outlet valve (112), initially extends away from the pressure measuring connection (114) and subsequently extends towards the pressure measuring connection (114).

Description

[0001] Description

[0002] Breakdown assistance system

[0003] The application relates to a breakdown assistance system for inflating a vehicle tire, in particular for a motor vehicle.

[0004] A breakdown assistance system is used, for example, in a motor vehicle to enable the tire to be sealed and inflated in the event of a tire puncture.

[0005] It is desirable to provide a breakdown assistance system that enables reliable operation.

[0006] A breakdown assistance system for inflating a vehicle tire is specified. The breakdown assistance system includes a compressor. The compressor is designed to pressurize tire sealant. Furthermore, the compressor is designed to pressurize air. Using the breakdown assistance system's compressor, it is thus possible to pump tire sealant and / or air into the vehicle tire.

[0007] The compressor has a cylinder housing. The cylinder housing surrounds, for example, a piston chamber in which a piston of the compressor can be displaced along a first direction. By means of this displacement of the piston relative to the cylinder housing, the sealing agent and / or the air can be pressurized.

[0008] An exhaust valve is located in the cylinder housing. The exhaust valve allows flow in one direction from the piston chamber to an outlet of the cylinder housing. The exhaust valve blocks flow in the opposite direction. The exhaust valve is designed, for example, as a check valve.

[0009] The breakdown assistance system includes a pressure gauge. The pressure gauge is designed, for example, as a manometer. The pressure gauge is designed, for example, as an analog device. It is also possible for the pressure gauge to be an electrical or electronic pressure gauge that includes a pressure sensor and an associated evaluation circuit with a processor and memory.

[0010] The pressure gauge is attached to a pressure measurement port on the cylinder housing. Using the pressure gauge, it is possible, for example, to read the pressure pumped into the tire by the compressor during operation. This makes it possible to determine whether the tire has been sufficiently inflated during operation.

[0011] A damping channel is arranged in the cylinder housing. The damping channel is located between the outlet valve and the pressure measuring port. The pressure measuring device is fluidically connected to the outlet via the damping channel. The fluidic connection enables the pressure measuring device to measure and display a pressure at the outlet. The damping channel has a path that extends from the outlet valve, initially away from the pressure measuring port, and then toward the pressure measuring port.

[0012] The breakdown assistance system features a compact design. To achieve this, the components of the breakdown assistance system and the air connection ducts are kept as small as possible. This means that the pressure gauge, for example, is located close to the outlet and also close to the piston. The damping duct ensures that, despite this close location, mechanical and / or pneumatic vibrations are not transmitted to the pressure gauge during operation, or are only transmitted in a dampened manner. For example, vibrations caused by the piston movement are not transmitted to the pressure gauge, or are only transmitted in a dampened manner, and thus significantly reduced. This allows the pressure gauge to measure and display the actual pressure more reliably. Furthermore, damage to the pressure gauge, which could render it inaccurate or inoperable, can be avoided.

[0013] The damping channel is integrated into the cylinder housing. This eliminates the need for an additional external air duct to the pressure gauge port. This allows for a compact design of the compressor and thus the breakdown assistance system.

[0014] In particular, the damping channel extends the distance between the outlet and the pressure measurement port compared to conventional breakdown assistance systems. This longer transport path through the damping channel reduces the transmission of vibrations caused by air blasts to the pressure gauge. This allows pressure to be precisely measured and displayed. The service life of the pressure gauge and the compressor is increased. The arrangement of the damping channel as an additional air duct in the cylinder housing enables space-saving integration of the damping channel.

[0015] According to one embodiment, the damping channel is formed between a base body of the cylinder housing and a housing cap. The base body and the housing cap are connected to one another. For example, the base body surrounds the piston chamber. An exhaust valve is attached to the base body. For example, the pressure gauge is also attached to the base body. Existing installation space due to the shape of the base body is used to form the damping channel. In particular, this installation space can be located at the edge of the base body. Arranging the housing cap enables the damping channel to be formed between the housing cap and the base body. Thus, the base body can still be manufactured using conventional production methods. The damping channel can be integrated in a space-saving manner.

[0016] According to one embodiment, the base body and the housing cap are connected by a welded joint. This creates an airtight and durable, stable connection.

[0017] According to one embodiment, the base body and the housing cap are each made of a plastic. It is possible for the base body and the housing cap to be made of the same plastic. It is also possible for the base body and the housing cap to be made of different plastics. For example, the base body and the housing cap are joined together by ultrasonic welding.

[0018] According to one embodiment, the damping channel is formed, at least in sections, by a space bounded on all sides by the base body and the housing cap. This space serves, for example, as a damping chamber. The chamber represents a comparatively large volume in which air blasts and vibrations are dampened.

[0019] According to one embodiment, the damping channel has different cross-sections along its length. For example, the damping channel initially has a larger cross-section at the outlet than at the direct inlet to the pressure measurement port. In particular, the damping channel also has a larger cross-section within the chamber than in the supply lines to the chamber and in the discharge lines away from the chamber. This allows for efficient use of available installation space and a reliable damping effect to be achieved.

[0020] According to one embodiment, the damping channel is designed, at least in sections, in the manner of a bottle siphon. Two tubular elements, for example, the base body and the housing cap, with different diameters are arranged coaxially, for example, to form the section in the manner of a bottle siphon. This allows for a reliable connection between the base body and the housing cap, and the damping channel can be integrated into the cylinder housing in a space-saving manner.

[0021] According to one embodiment, the damping channel has an annular section. For example, the space of the damping channel is formed by the annular section. This enables a reliable damping effect and space-saving integration of the damping channel into the cylinder housing.

[0022] According to one embodiment, the damping channel is formed, at least in sections, by a hollow cylindrical projection of the cylinder housing. For example, the hollow cylindrical projection is part of the section in the manner of a bottle siphon. This enables space-saving integration of the damping channel into the cylinder housing.

[0023] The damping channel is specifically aligned along various directions and has different cross-sections along its length. Thus, the damping channel is designed like a labyrinth. The labyrinthine layout of the damping channel enables space-saving integration and a reliable damping effect. Existing installation space can be used efficiently to achieve the desired damping effect.

[0024] According to at least one embodiment, the compressor is designed to provide an air pressure of up to 700 kilopascals. For example, the compressor is designed to inflate the tire from an air pressure of at least 200 kilopascals up to 600 kilopascals, 650 kilopascals, or more. Thus, the breakdown assistance system is suitable for passenger cars and also for transport vehicles and / or delivery vans. For transport vehicles and / or delivery vans, a tire pressure of up to 700 kilopascals (7 bar) is required; the compressor can achieve a maximum pressure of up to 900 kilopascals, for example. To be able to provide this pressure, the compressor must be designed accordingly and, for example, achieve a sufficiently high compression rate during operation.Particularly at these higher pressures and with the compressor, which, for example, provides the high pressures due to the high compression ratio, vibrations occur that could be transmitted to the pressure gauge through air blasts. This transmission is adequately dampened by the damping channel. Thus, even in the breakdown assistance system, which can provide the high pressures for vans or delivery trucks, damage to the pressure gauge due to mechanical and / or pneumatic vibrations can be avoided or reduced.

[0025] Further advantages, features, and refinements are evident from the following examples explained in conjunction with the figures. Identical, similar, and functionally identical elements may be provided with the same reference numerals throughout the figures. The figures and the proportions of the elements depicted in the figures are not to scale.

[0026] They show:

[0027] Figure 1 is a schematic representation of a breakdown assistance system according to an embodiment, and

[0028] Figure 2 is a schematic representation of a part of the cylinder housing according to an embodiment.

[0029] Figure 1 shows a breakdown assistance system 1 according to one exemplary embodiment. The breakdown assistance system 1 is designed for sealing and inflating a vehicle tire. For this purpose, the breakdown assistance system 1 is particularly designed for pumping sealant into the vehicle tire and for inflating the vehicle tire. The breakdown assistance system 1 has a compressor 100 (Figure 2) for pumping the sealant and air.

[0030] Figure 2 shows parts of the compressor 100 according to one exemplary embodiment. The compressor 100 has a cylinder housing 110. Within the cylinder housing 110, a piston (not explicitly shown) is linearly displaceable along a first direction 201 within a piston chamber 111. The piston movement relative to the cylinder housing 110 can pressurize the sealing agent and / or the air.

[0031] For example, the piston is coupled to a drive shaft of the compressor 100, which drives the linear movement of the piston.

[0032] The cylinder housing has an outlet 113. The outlet 113 can be fluidly connected to the tire, for example, by means of a hose, in order to pump sealant and / or air from the compressor 100 into the tire.

[0033] An outlet valve 112 is arranged between the piston chamber 111, in which the piston is slidably arranged, and the outlet 113. The outlet valve 112 is, for example, a check valve. The outlet valve 112 allows tire sealant and / or air to be forced from the piston chamber 111 to the outlet 113. A flow in the opposite direction from the outlet 113 into the piston chamber 111 is blocked by the outlet valve 112.

[0034] Downstream of the outlet valve 112, a pressure gauge 101 is fluidly connected to the outlet 113.

[0035] The pressure gauge 101 is, for example, a manometer. The pressure gauge 101 is designed to measure and display the pressure in the outlet 113. Thus, it is possible, for example, to display the tire pressure using the pressure gauge 101.

[0036] The pressure gauge 101 is connected to the cylinder housing 110. The cylinder housing 110 has a pressure measuring port 114. The pressure gauge 101 can be mechanically attached to the pressure measuring port 114. Furthermore, a fluidic coupling is possible at the pressure measuring port 114 to enable pressure measurement. Fluidic communication is possible between the pressure measuring port 114 and the outlet 113.

[0037] A damping channel 120 is formed between the outlet 113 and the pressure measuring port 114. The damping channel 120 enables fluid communication between the outlet 113, in particular on the output side of the outlet valve 112, and the pressure measuring port 114. The damping channel 120 forms a fluid connection between the pressure measuring port 114 and the outlet 113.

[0038] The damping channel 120 is formed in the cylinder housing 110. The cylinder housing 110 has the damping channel 120. In addition to the piston chamber 111, the outlet 113, and the pressure measurement port 114, the damping channel 120 is integrated into the cylinder housing 110.

[0039] The damping channel 120 extends, starting from the outlet 113 in the illustrated embodiment, initially along a second direction 202. In this section, the damping channel has, at least in sections, a first diameter 121. The second direction 202 is in particular perpendicular to the first direction 201. Along the flow direction toward the pressure measuring connection 114, the damping channel 120 subsequently has, for example, an annular section 125. The annular section 125 extends, for example, around the first section, which is arranged along the second direction 202.

[0040] The annular section 125 forms in particular a space 127 which provides a comparatively large volume.

[0041] The chamber 127 is connected to the pressure measuring connection 114 by means of a recess 130.

[0042] During operation, air with the pressure to be measured thus first passes from the outlet 113 along the second direction 202 into the space 127. The air then passes through the recess 130 to the pressure measuring connection 114. There, the pressure can be measured by means of the pressure measuring device 101.

[0043] The damping channel reduces the risk of vibrations and pulsations that may be present in the outlet 113, for example due to the piston movement in the piston chamber 111, being transmitted to the pressure measuring port 114 and influencing the pressure measuring device 101 there. The damping channel 120 has a damping effect and / or a throttling effect, for example due to its length, so that the air is guided a sufficient distance between the outlet 113 and the pressure measuring port 114. The chamber 120 with the enlarged volume also forms a damping chamber in which vibrations and pulsations propagate more slowly and are thus dampened. For example, the recess 130 has a diameter 122 that is significantly smaller than a diameter 123 of the chamber 127, which directly borders the recess 130.Thus, the recess 130 in the transition between the chamber 127 and the pressure measuring connection 114 forms a throttle that dampens vibrations and pulsations. The first diameter 121 is, for example, larger than the diameter 122 of the recess 130 and smaller than the diameter 123 of the chamber 127. In the illustrated embodiment, the damping channel 120 is formed between a base body 115 and a housing cap 116 of the cylinder housing 110. The cylinder housing 110 is formed from the base body 115 and the housing cap 116. For example, the base body 115 is made of a plastic. The base body 115 surrounds, in particular, the piston chamber 111 and the outlet 113. The base body 115 also forms the pressure measuring connection 115. The pressure measuring device 101 is connected, in particular, to the base body 115 of the cylinder housing 110. The outlet valve 112 is arranged in the base body 115.

[0044] The housing cap 116 is, for example, attached to the base body 115 from the outside. The housing cap 116 is made, in particular, of a plastic. The base body 115 and the housing cap 116 are each shaped such that the damping channel 120 is formed between the base body 115 and the housing cap 116.

[0045] The base body 115 and the housing cap 116 are connected to each other in an airtight manner. In particular, connections 140 are provided for this purpose. The connections 140 are formed, in particular, by means of a welding process, for example, by means of an ultrasonic welding process. Thus, the base body 115 and the housing cap 116, each formed from a plastic, are connected to each other by means of an ultrasonic connection.

[0046] The base body 115 has, for example, a hollow cylinder-shaped projection 126 that protrudes along the second direction 202. The hollow cylinder-shaped projection 126 surrounds the first section of the damping channel 120, which extends along the second direction 202.

[0047] The housing cap 116 has a projection 117 that projects into the hollow cylindrical projection 126. The damping channel 120 is formed in the region of the projection 117, between the projection 117 and the cylindrical projection 126. A first passage 128 is formed at an end of the hollow cylindrical projection 126 facing away from the outlet 130. At the first passage 128, the air can exit the hollow cylindrical projection 126 along the first direction 201.

[0048] The housing cap 116 has a second projection 118. The second projection 118 surrounds the hollow cylindrical projection 126 of the base body 115. From the inside to the outside, the projection 117, the hollow cylindrical projection 126, and the second projection 118 are thus arranged coaxially.

[0049] The damping channel extends after the first passage 128 between the hollow cylinder-shaped projection 126 and the second projection 118 along the second direction 202 in the direction of the outlet 113. However, a direct connection to the outlet 113 is not formed, since the base body 115 delimits the damping channel 120.

[0050] A second passage 129 is formed between the base body 115 and the second projection 118. Air can flow through the second passage 129 along the first direction 201. The damping channel 120 is formed downstream of the second passage 129 by means of the space 127. The space 127 extends annularly around the second projection 118, forming the annular portion 125.

[0051] Downstream of the chamber 127, the recess 130 is provided as part of the damping channel 120. Downstream of the recess 130, the pressure measurement port 114 is arranged.

[0052] Particularly in the area of ​​the hollow cylindrical projection 126 of the base body 115 and the projections 117, 118 of the housing cap 116, the damping channel 120 is designed in the manner of a bottle siphon 124. The flow direction initially extends along the second direction 202 away from the outlet 113, in the first passage 128 transversely to the second direction 202, subsequently along the second direction 202 toward the outlet 113, then in the second passage 129 transversely to the second direction 202, subsequently annularly in the space 127 around an axis along the second direction 202, and subsequently through the recess 130 toward the pressure measuring connection 114.

[0053] The housing cap 116 has a flat base plate 119. Connections 140 are formed on the base plate 119. The projections 117, 118 protrude from the base plate 119 along the second direction 202. The base plate 119 defines the damping channel 120 along the second direction 202 on a side facing away from the outlet 113. The damping channel 120 is completely defined by the base body 115 of the cylinder housing 110 and the housing cap 116. Thus, the damping channel 120 is integrated into the cylinder housing 110.

[0054] The breakdown assistance system 1 with the compressor 100, which has the damping channel 120 in the cylinder housing 110, enables a robust breakdown assistance system 1. The pressure gauge 101 is reliably protected from damaging vibrations caused by air blasts by means of the damping channel 120. The integration of the damping channel 120 into the cylinder housing 110 enables a space-saving arrangement of the damping channel 120, so that the breakdown assistance system 1 can be designed, in particular, to be the same size as a conventional breakdown assistance system 1 without the damping channel.

[0055] Reference symbol

[0056] 1 breakdown assistance system

[0057] 100 compressor

[0058] 101 Pressure gauge

[0059] 110 cylinder housing

[0060] 111 Piston chamber

[0061] 112 Exhaust valve

[0062] 113 Outlet

[0063] 114 Pressure measuring connection

[0064] 115 basic bodies

[0065] 116 Housing cap

[0066] 117 lead

[0067] 118 lead

[0068] 119 Base plate

[0069] 120 damping channel

[0070] 121 , 122, 123 diameter

[0071] 124 Section in the style of a bottle siphon

[0072] 125 annular section

[0073] 126 Hollow cylinder-shaped projection

[0074] 127 Room

[0075] 128 first passage

[0076] 129 second passage

[0077] 130 Recess for pressure measuring connection

[0078] 140 connection

[0079] 201 first direction

[0080] 202 second direction

Claims

Patent claims 1. Breakdown assistance system (1) for inflating a vehicle tire, comprising a compressor (100) and a pressure gauge (101), wherein the compressor (100) is designed to pressurize tire sealant and air, and wherein the compressor (100) has a cylinder housing (110), wherein - the cylinder housing (110) surrounds a piston chamber (111) in which a piston is linearly displaceable, and - an outlet valve (112) is arranged in the cylinder housing (110) which allows a flow in one direction from the piston chamber to an outlet (113) of the cylinder housing (110) and blocks a flow opposite to this direction, - the pressure gauge (101) is attached to a pressure measuring connection (114) of the cylinder housing (110), - a damping channel (120) is arranged in the cylinder housing (110) between the outlet valve (112) and the pressure measuring connection (114), wherein the pressure measuring device (101) is fluidically connected to the outlet (113) by means of the damping channel (120) in order to measure and display a pressure at the outlet (113), wherein the damping channel (120) has a course which, starting from the outlet valve (112), initially extends away from the pressure measuring connection (114) and subsequently runs towards the pressure measuring connection (114).

2. Breakdown assistance system (1) according to claim 1, wherein the damping channel (120) is formed between a base body (115) of the cylinder housing (110) and a housing cap (116), wherein the base body (115) and the housing cap (116) are connected to one another.

3. Breakdown assistance system according to claim 2, wherein the base body (115) and the housing cap (116) are connected to one another by means of a welded joint (140).

4. Breakdown assistance system according to claim 2 or 3, wherein the base body (115) and the housing cap (116) are each formed from a plastic.

5. Breakdown assistance system according to one of claims 2 to 4, wherein the damping channel (120) is formed at least in sections by means of a space (127) which is bounded on all sides by the base body (115) and the housing cap (116).

6. Breakdown assistance system according to one of the preceding claims, in which the damping channel (120) has different cross-sections (121, 122, 123) along its course.

7. Breakdown assistance system according to one of the preceding claims, in which the damping channel (120) is designed at least in sections in the manner of a bottle siphon.

8. Breakdown assistance system according to one of the preceding claims, wherein the course has an annular section (125).

9. Breakdown assistance system according to one of the preceding claims, in which the damping channel (120) is formed at least in sections by means of a hollow cylinder-shaped projection (126) of the cylinder housing (110).

10. Breakdown assistance system according to one of the preceding claims, wherein the compressor (100) is designed to provide an air pressure of up to 700 kilopascals.

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