JP6138342B2 - Compressor system with clutch - Google Patents

Description

  The present invention relates to a compressor system for supplying compressed air to a commercial vehicle, the compressor system including a compressor, a clutch, and an auxiliary device, and the compressor system is connected to an input shaft by a prime mover of the commercial vehicle. And a compressor system in which the compressor can be completely disconnected from the prime mover by a clutch.

BACKGROUND OF THE INVENTION Modern commercial vehicles have different partial systems that can be operated with compressed air. These partial systems include, for example, compressed air-operated service brakes and air suspensions. In order to ensure the supply of compressed air to these partial systems, commercial vehicles are usually provided with a compressed air supply device. This compressed air supply device has a compressor. This compressor is mechanically driven by a prime mover of a commercial vehicle. Since the demand for compressed air inside commercial vehicles is not usually enough to require continuous operation of the compressor, a clutch is provided between the prime mover and the compressor to allow the compressor and the prime mover to be disconnected. It may be. This is desired. This is because the compressor operation consumes energy that can be saved if compressed air is not needed or if the existing compressed air reserve can meet the demand for compressed air for the consumer over a period of time. Because it will end up.

  As is apparent from generally known prior art, modern commercial vehicles are often provided with clutches. This clutch can completely disconnect the compressor from the prime mover to save energy. This means that when the hydraulic pump is conventionally arranged on the output side of the crankshaft of the compressor, the hydraulic pump is also disconnected from the prime mover simultaneously with the compressor. As a result, for example, steering assist in the form of power steering used in commercial vehicles can no longer be used. However, this is unacceptable for safety reasons.

  In order to solve this problem, various alternative means are known. One possible solution is to turn off the steering assist when the compressor is disconnected. This changing means is based on the premise that the compressor connection may be released mainly on the autobahn (highway). In this section, since the curve curvature is small, steering assist is not necessarily required. However, for example, when a steering operation for avoiding is to be performed, there is no steering assistance, and a compressor must be connected.

  Another possibility is to drive the steering assist purely electrically. In this case, there is no longer a steering assist pump that is mechanically driven by the prime mover, and this pump requires its own electric motor. This can be achieved in principle, but the electric motor must provide a large output of about 50 kW. Therefore, additional space and weight are required accordingly.

  Furthermore, based on DE 10 2008003957, a compressor with a clutch that makes it possible to decouple the compressor from the prime mover is apparent. When the compressor is disconnected from the prime mover, the auxiliary device connected in series with the compressor cannot be operated.

  Based on DE 102009023869, a compressor system for supplying compressed air to a commercial vehicle and a method of operating such a compressor system are apparent. The commercial vehicle has a prime mover, and is driven by the prime mover via a power train. From this power train, the drive train for the compressor system is branched via the transmission. The compressor system includes a compressor, an auxiliary device, and a hydraulic pump in the specification. The compressor system as a whole is driven by a drive train. A secondary output member for driving the hydraulic pump is provided via a gear transmission. A clutch is disposed between the gear transmission and the compressor. This clutch can be engaged and disengaged without affecting the operation of the hydraulic pump. This compressor system has the disadvantage that a relatively large amount of configuration space is used based on a parallel structure. Furthermore, the gear transmission and the transmission not only require additional construction space, but also greatly increase the overall weight of the compressor system.

DISCLOSURE OF THE INVENTION Accordingly, an object of the present invention is to improve the compressor system so that the operation of the auxiliary device at the same time as the complete disconnection of the compressor from the prime mover reduces the construction space and weight without requiring significant mechanical effort. It is to make it possible to save.

  This problem is solved by starting with the compressor system described in the superordinate concept section of claim 1 and linking it to the characteristics described in the feature section of claim 1. Advantageous refinements of the invention emerge from the subsequent dependent claims.

  According to the present invention, the hollow shaft is coaxially arranged with respect to the input shaft, and this hollow shaft can be coupled to the input shaft via the clutch, and thereby, in each cylinder provided in the compressor. At least one piston which can be reciprocated at least indirectly. In other words, the input shaft extends through the hollow shaft and drives an auxiliary device, which may preferably be a hydraulic pump. Therefore, this auxiliary device is driven by the prime mover via the input shaft regardless of the clutch position. On the other hand, at least one piston of the compressor can be interrupted via a clutch. Thus, the compressor can be completely disconnected from the prime mover, thereby saving energy. Furthermore, the compressor system is based on a linear structure and a coaxial shaft arrangement, in particular saving construction space and weight.

  It is particularly preferred that the at least one piston is driven via one cylindrical eccentric element arranged on the outer peripheral surface of the hollow shaft. This cylindrical eccentric element is preferably a cam.

  It is further preferred if the cylindrical eccentric element forms part of the hollow shaft. In other words, the hollow shaft has only one section with a larger radius and an eccentric geometry compared to the outer radius of this shaft.

  The present invention includes the technical teaching that a cylindrical eccentric element can be fitted over a hollow shaft. There is preferably a press fit between the cylindrical eccentric element and the hollow shaft. However, it is also possible to glue or weld a cylindrical eccentric element to the outer peripheral surface of the hollow shaft.

  It is particularly preferred if the connecting rod connected to the at least one piston via a connecting rod pin is in contact with the cylindrical eccentric element. Thus, the rotational movement of the hollow shaft is converted into translational movement of at least one piston via the cylindrical eccentric element, the connecting rod in contact with the element, and the connecting rod pin.

  According to a preferred embodiment, the compressor has at least two cylinders, each of which is provided with a respective piston capable of reciprocating therein, wherein the at least two pistons are hollow shafts. Each is driven through one cylindrical eccentric element arranged in tandem on the outer peripheral surface. However, it is also possible to drive a compressor with three, four or more than four cylinders in the same manner as described above.

  According to another preferred embodiment, the compressor has at least two cylinders, each of which includes a respective piston capable of reciprocating therein, wherein at least one piston is hollow. It is driven through one cylindrical eccentric element arranged on the outer peripheral surface of the shaft, and at least the other piston is driven through the input shaft. For this purpose, the input shaft preferably has a crank at the location where the connecting rod acts. Thereby, the rotational movement of the input shaft can be converted into the translational movement of at least one piston.

  It is further proposed that the compressor is formed as a single-stage compressor, a two-stage compressor or a more than two-stage compressor.

  In the following, further means for improving the present invention will be described in detail with reference to the drawings together with the description of preferred embodiments of the present invention.

1 is a schematic view of a compressor system according to the present invention for supplying compressed air to a commercial vehicle having a compressor with one piston. It is the schematic of the compressor system which concerns on 2nd Embodiment which has a compressor provided with two pistons. It is the schematic of the compressor system which concerns on 3rd Embodiment which has a compressor provided with two pistons.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS The compressor system shown in FIG. 1 mainly comprises an input shaft 4 driven by a prime mover 5. The input shaft 4 drives the auxiliary device 3. A hollow shaft 6 is arranged coaxially with the input shaft 4. The hollow shaft 6 can be coupled to the input shaft 4 via the clutch 2. When the clutch 2 coupling the input shaft 4 to the hollow shaft 6 is connected, the hollow shaft 6 is rotated at the same speed as the input shaft 4 after a short starting phase. The hollow shaft 6 reciprocates in the cylinder 7a via one cylindrical eccentric element 9a disposed on the outer peripheral surface thereof and a connecting rod 11a disposed on the cylindrical eccentric element 9a. The movable piston 8a is driven. The piston 8a is coupled to a connecting rod 11a via a connecting rod pin 10.

  According to FIG. 2, the compressor system has a compressor 1 with two cylinders 7a, 7b. Each of the cylinders 7a and 7b is provided with one piston 8a and 8b that can reciprocate inside thereof. Both pistons 8a and 8b are driven via two cylindrical eccentric elements 9a and 9b arranged in tandem on the outer peripheral surface of the hollow shaft 6. Both cylindrical eccentric elements 9a, 9b are offset from each other by 180 °.

  FIG. 3 shows another embodiment of the compressor system. This compressor system includes a compressor 1 having two cylinders 7a and 7b. One piston 8a is driven via one cylindrical eccentric element 9a disposed on the outer peripheral surface of the hollow shaft 6. The other piston 8 b is directly driven via the input shaft 4. For this purpose, the input shaft 4 has a crank 12 at a location where the connecting rod 11b acts. Therefore, not only the auxiliary device 3 but also the piston 8b of the compressor 1 is driven via the input shaft 4 at the disconnected clutch position. The other piston 8 a can be connected / disconnected via the clutch 2.

  The present invention is not limited to the preferred embodiments described above. On the contrary, several variants are possible which are also included within the scope of protection of the following claims. For example, it is possible to use a compressor system having a compressor 1 with an arbitrary number of pistons 8.

  In other words, just because it says “has or is included” does not exclude another element or step; It is not excluded. Furthermore, it should be noted that a feature or step described with reference to one of the above-described embodiments is used in combination with another feature or step of another embodiment described above. Also good. Reference signs in the claims should not be construed as limiting.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Clutch 3 Auxiliary device 4 Input shaft 5 Prime mover 6 Hollow shaft 7a, 7b Cylinder 8a, 8b Piston 9a, 9b Cylindrical eccentric element 10a, 10b Connecting rod pin 11a, 11b Connecting rod 12 Crank

Claims (5)

A compressor system for supplying compressed air to a commercial vehicle, the compressor system comprising a compressor (1), a clutch (2), and an auxiliary device (3), the compressor system comprising a commercial vehicle In a compressor system, which can be driven via an input shaft (4) by a prime mover (5) and the compressor (1) can be completely disconnected from the prime mover (5) by a clutch (2),
A hollow shaft (6) is arranged coaxially to the input shaft (4), and the hollow shaft (6) can be coupled to the input shaft (4) via the clutch (2), thereby are reciprocable at least one piston (8a) has drive motion in a cylinder provided in the compressor (1), respectively (7a),
The compressor (1) has at least two cylinders (7a, 7b), and each of the cylinders (7a, 7b) has one piston (8a, 8b) that can reciprocate therein. , At least one piston (8a) is driven via one cylindrical eccentric element (9a) arranged on the outer peripheral surface of the hollow shaft (6), and at least the other piston (8b) is driven A compressor system for supplying compressed air to a commercial vehicle, characterized in that it is driven via an input shaft (4) . Compressor system of cylindrical eccentric element (9a) is a hollow shaft (6) are integrally formed, according to claim 1, wherein. Cylindrical eccentric elements (9a) are possible fitted on the hollow shaft (6), a compressor system of claim 1, wherein. Wherein the at least one piston (8a) to be coupled via a connecting rod pin (10a) the connecting rod (11a) is in contact with the cylindrical eccentric element (9a), a compressor of claim 1, wherein system.   2. Compressor system according to claim 1, wherein the compressor (1) is formed as a single-stage compressor, a two-stage compressor or a more than two-stage compressor.

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