KR20180109933A - In particular, the eccentric assembly for the pump of the ABS system and the pump for the ABS system - Google Patents

Abstract

The present invention relates to a radial piston pump used in, for example, an ABS system in a vehicle. The pump has, in a known type of construction, a drive shaft having an eccentric section in which a rolling bearing which rotates eccentrically about the rotational axis of the shaft as a whole is seated. An object of the present invention is to propose an eccentric assembly having a high reliability in operation and a corresponding pump. To this end, An eccentric shaft section (4) for eccentrically rotating about a main rotational axis (H), comprising: an eccentric shaft section (4) for providing or supporting an internal track (9); There is proposed an eccentric assembly 1 having a rolling bearing device 7 which is disposed on an eccentric shaft section 4 and defines an eccentric axis E, 7 comprises a plurality of rotating bodies 12 and one outer track device 8 which provides an outer track 10 for the rotating body 12 and which rotates the rotating body 12 Has a rolling motion on an inner orbit 9 and an outer orbit 10 in the rotary chamber 11 and the eccentric assembly also has a support element 17 and a support surface 18 as support partners, The support elements 17 are operatively resting on the support surface 18 and together they form an axial support of the eccentric shaft section 4 on the housing 5 wherein one of the support partners And another support partner is supported on the eccentric shaft section 4 In this case, the support surface 18 is arranged fixed to the housing.

Description

In particular, the eccentric assembly for the pump of the ABS system and the pump for the ABS system

The present invention provides a semiconductor device comprising: a housing; An eccentric shaft section for eccentric rotation about a main rotational axis, comprising: an eccentric shaft section for providing or supporting an internal raceway; A rolling bearing arrangement, comprising: a rolling bearing arrangement disposed on an eccentric shaft section to define an eccentric axis, and having a plurality of rotators and an outer raceway arrangement, the outer raceway arrangement providing an outer raceway for the rotor, Wherein the rotating body performs rolling motion on an inner orbit and an outer orbit in the rotary chamber; A support element as a support partner and a support surface, said support element being movable on a support surface, said support partners together forming an axial support of an eccentric shaft section on the housing, one of said support partners And another support partner is supported on the eccentric shaft section, including a support element and a support surface. The present invention also relates to a pump for an ABS system having the eccentric assembly.

Such a pump is used, for example, in an ABS system in a vehicle, and is based on a radial piston principle. The pump has, in a known type of construction, a drive shaft with an eccentric section in which a rolling bearing, which rotates eccentrically about the rotational axis of the shaft as a whole, is seated. The pump has piston cylinder assemblies for pumping fluid wherein the piston ends are in contact with the outer jacket surface of the rolling bearing and are operated to vibrate by eccentric motion of the rolling bearing and consequently eccentric movement of the jacket face of the rolling bearing .

Such a pump is disclosed in DE 102 41 306 A1, which clearly forms the prior art. A rolling bearing is seated on the eccentric section of the shaft, the rolling bearing being formed by a needle sleeve in which a plurality of needles are disposed in the cage. The needle sleeve is closed at one axial end and the axial end defines a contact surface for the ball fixedly positioned within the housing of the pump so that the needle sleeve can be supported on the ball during eccentric motion. At the opposite axial end, the needle sleeve terminates in a rim disposed around the through opening for the eccentric section. In the radial direction, the piston end of the operating piston is supported on the needle sleeve.

An object of the present invention is to propose an eccentric assembly having a high reliability during operation and a corresponding pump.

The problem is solved by an eccentric assembly having the features of claim 1 and a pump having the features of claim 10. Preferred or preferred embodiments of the invention are illustrated by the dependent claims, the following detailed description and the accompanying drawings.

The object of the present invention is an eccentric assembly, preferably suitable for pumps and / or formed for pumps. The pump is preferably adapted to generate hydraulic pressure in the ABS system of the vehicle and / or is configured to generate hydraulic pressure.

The eccentric assembly includes an eccentric shaft section, wherein the eccentric shaft section is structurally shaped to rotate eccentrically about a main rotational axis. Preferably, the eccentric shaft section is disposed eccentrically on the drive shaft, in which case the drive shaft defines its main axis of rotation by its own rotation. Optionally, the drive shaft forms a portion of the eccentric assembly. The eccentric shaft section provides an internal track, or supports a component having an internal track. Particularly preferably, the internal orbit is disposed on the base material of the eccentric shaft section or is formed of the base material.

The eccentric assembly comprises a rolling bearing arrangement, in which case the rolling bearing arrangement is formed as a particularly radial rolling bearing arrangement. The rolling bearing arrangement is disposed on the eccentric shaft section and defines its eccentric axis as its own axis of rotation. The eccentric shaft and the main rotary shaft are offset in parallel with respect to each other. In this case, the eccentric shaft rotates eccentrically about the main rotary shaft during operation.

The rolling bearing arrangement comprises a plurality of rotators and an outer raceway arrangement, wherein the rotors are arranged annularly about an eccentric axis within the rotor chamber in the outer raceway arrangement. The rotating body is particularly formed as a roller, and in a special case, as a needle roller. When formed as a needle roller, the needle roller has an axial length extension greater than three times the diameter. Preferably, the rotating body, in particular the rollers, in particular the needle rollers, are arranged in the cage, particularly preferably of the cage guide type. The outer track device provides an outer track for the rotor. The external track device is preferably formed rotationally symmetrical with respect to the eccentric axis. The rotating body rolls on the inner orbit and the outer orbit, and particularly rolls. The inner orbit and / or outer orbit is preferably formed as a straight cylinder jacket face, which is coaxially and / or concentrically arranged with respect to the eccentric axis.

The eccentric assembly has a support element and a support surface, in which case the support element and the support surface each form a support partner. The support element is movable on the support surface.

In this case, the eccentric assembly is designed so that the supporting element moves only in sliding manner on the supporting surface as the sliding surface only during operation as the sliding element, or the supporting element slides and simultaneously rolls on the supporting surface as the sliding rolling surface May be proposed. It is also possible to propose a configuration in which the support element is formed as a rolling element which only rolls on the support surface as a rolling surface.

The support surface is preferably flat, in particular planar. The support partners together define an axial support of the eccentric shaft section on the housing. In particular, the support partner defines a transfer member or transfer chain for transferring pressure between the eccentric shaft section and the housing, and more particularly axially, to the main rotational axis and / or the eccentric axis. A configuration is proposed in which one support member is supported on the eccentric shaft section for transmission of axial pressure and the other support member is fixed to the housing.

In the context of the present invention, a configuration is claimed in which the support surface is fixedly disposed on the housing as one side support partner. With this arrangement, the load introduced into the support surface from the support element can be discharged through the housing, and in this way the movable parts of the eccentric assembly are not loaded. Comparing such a configuration with known prior art, it has been found that, in the structure of the type already known, the support surface is pivoted in one plane against the main rotation axis and / or perpendicular to the eccentric axis due to the pressure load by the support element, It is confirmed that there is a risk that stresses will be introduced into the rolling bearings in the same manner. Alternatively, the support surface may be fixedly received in the housing and thereby be supported more stably. Thereby, the load on the rolling bearing is reduced, and the wear of the rolling bearing is reduced, thereby improving the reliability of the eccentric assembly during operation.

Particularly preferably, the support element is supported in the radial direction by an external track device. The radial direction is particularly related to the eccentric axis. In particular, the interaction between the support element and the external track device is induced. On the other hand, the phenomenon that the supporting element is held on the eccentric shaft by the external orbital device is minimized, and on the other hand, the external orbital device is held at a predetermined position by the supporting element and / Position.

In one preferred refinement of the invention, the outer track device is held in the axial direction of the eccentric shaft, more particularly in the form-fitting manner by the support element towards the support surface. Thereby, it is also ensured by the support element that the external track device can not move in the direction of the support surface and is fixed in place. Thus, the axial positioning or guiding of the outer track device by the support element also increases the life of the rolling bearing device, as well as the reliability of the eccentric assembly.

Particularly preferably, the support element is formed as a ball. In such a formation, it is particularly preferable that the support surface is formed to be flat or flat.

The ball can be held so as to be non-rotatable within the outer raceway device. Alternatively, as the ball is rotatably and / or rollably supported within the outer track device, the ball as the support element can rotate without friction in the outer track device during rolling on the support surface.

The end surface on the running surface, in particular the eccentric shaft section, on which the ball as a support element is supported, can be formed flat. Alternatively, in order to define the position of the ball as a support element, the surface has a centering, for example a groove.

In principle, a configuration may be proposed in which the support surface is formed by the base material of the housing, whereby it is preferably formed only as a planar area of the housing. In one preferred refinement of the invention, the eccentric assembly has a support plate, which is fixedly disposed in or on the housing to form a support surface. This arrangement has the advantage that the housing can be made of an inexpensive material such as, for example, an aluminum alloy, while achieving sufficient abrasion resistance and mechanical stability by, for example, inserting a support plate made of steel. The support plate can be formed as a plate-like part. Alternatively, the support plate is a section of a more complex component that is fixedly disposed in the housing.

In one preferred embodiment of the invention, the outer track device has a receptacle for the support element. Particularly preferably, the support element can be arranged so as not to be lost in the receiving portion and / or in the receiving portion without being lost. Such a receptacle facilitates the assembly of the eccentric assembly, because the support element, especially the ball, can not be lost accidentally during assembly.

In a particularly preferred embodiment, the receptacle is formed as a snap receptacle, in which the support element, in particular the ball, can be snapped. In the snap receptacle, the support element, in particular the ball, is preferably retained in a form-fitting manner and / or in a forced-engagement manner.

Optionally, the receiving portion can be formed as a bearing for a support element, in particular for a ball, in particular as a sliding bearing and / or a rotatable bearing, in particular a ball bearing.

In a very cost effective manufacturing process, an external track device is formed as a sleeve with a sleeve bottom. The sleeve is particularly preferably formed with molding technology and, in special cases, is formed as a deep drawn sleeve. A configuration may be proposed in which the receiving portion, particularly the snap receiving portion, is provided in the bottom of the sleeve by a process sequence such as molding and separating. Particularly preferably, the sleeve bottom has, in particular, a circular through-opening, which is selected to be smaller than the diameter of the support element, in particular the ball, in the direction of the eccentric shaft section, And has a concave receiving structure.

Another object of the invention is a pump for an ABS system comprising an eccentric assembly according to any one of the preceding claims in which the eccentric shaft section is operatively connected to the drive shaft of the pump, Wherein the one piston end of the piston is supported on the outer jacket surface of the rolling bearing device so that the rotational movement of the input shaft results in the rotation of the eccentric shaft section and / And is converted into a vibration motion of the piston through the rolling bearing device.

Further features, advantages and effects of the invention are set forth in the following description of the preferred embodiments of the invention and the accompanying drawings.

1 is a schematic longitudinal cross-sectional view of one end face of a pump having an eccentric assembly, according to one embodiment of the present invention.
Fig. 2 and Fig. 3 are schematic longitudinal sectional views as a partial enlarged view of the receiving portion of the outer track device, respectively.

1 shows a schematic longitudinal section of an eccentric assembly 1 as a detail of a pump 22 for an ABS system. The pump 1 is formed as a radial piston pump and converts the rotational motion induced through the input shaft 2 into the oscillation motion of the two piston rods or the plunger 3 in the present embodiment. The oscillation motion proceeds in the radial direction to the main rotation axis H defined by the rotation of the input shaft 2. [

On the input shaft 2, an eccentric shaft section 4 is arranged and fixedly connected, in particular to rotate integrally with the input shaft, or form one end section of the input shaft 2. The eccentric shaft section (4) is formed in a circular shape when viewed in a transverse section perpendicular to the main rotation axis (H). The eccentric shaft E defines the eccentric shaft E. In this case, the eccentric shaft E is offset parallel to the main rotational axis H of the input shaft 2. [ The input shaft 2 is rotatably supported in a housing 5 of the pump 1 through a bearing device 6 formed as a ball bearing. On the eccentric shaft section 4 a rolling bearing arrangement 7 is arranged.

The rolling bearing device (7) has an external raceway device (8) formed as a sleeve. The eccentric shaft section 4 provides an inner raceway 9 and the outer raceway device 8 provides an outer raceway 10. The inner orbit 9 and the outer orbit 10 are formed coaxially and concentrically with respect to each other and are each implemented as a straight cylinder jacket surface. The inner orbit 9 and the outer orbit 10 are also coaxially and / or concentrically aligned with respect to the eccentric axis E. A plurality of rotating bodies 12 are arranged in the rotating body chamber 11 in the outer raceway apparatus 8 and are formed as rollers and in particular as cylinder rollers and have an inner raceway 9 and an outer race 10 ), And rolls in particular. The plunger (3) abuts on the outer jacket surface (13) of the outer track device (8) by one free end.

The outer raceway device 8 formed as a sleeve has a sleeve bottom 14 which terminates the outer raceway device 8 on one axial side. A support element in the form of a ball 17 is disposed between one end face 15 of the eccentric shaft section 4 and the support plate 16 disposed in the housing 5, A side surface 15 is supported on the support plate 16 through the ball. More precisely, the ball forms a support element 17 which is supported on the support surface 18 of the support plate 16 as an additional support partner. The support surface 18 and the end surface are aligned parallel to each other. The sleeve bottom 14 has a through opening 19 in which a ball is disposed. The ball and / or through opening 19 is centered with respect to the eccentric axis E. In the radial direction, the support element 17 formed as a ball is supported on the outer raceway device 8 so that the outer raceway device 8 and the support element 17 formed as a ball are mutually centered with respect to the eccentric axis E Centered. For example, the housing 5 is formed of an aluminum alloy and the support plate 16 is formed of a steel material, so that the support is formed in a state of almost no abrasion or no abrasion.

Figures 2 and 3 show a section in the region of the through opening 19 of the sleeve bottom 14 with the support element 17 once (Figure 2), once without the support element 17 (Fig. 3). Through the figure it can be seen that the through opening 19 forms a receiving portion 20 for the support element in the form of a ball 17. 3, the through-hole 19 is reduced to the diameter D1 on the side facing the eccentric shaft section 4, and this diameter D1 is smaller than the diameter D0 of the ball. In the central region, the receiving portion 20 has a diameter D2 or diameter profile matched to the diameter D0 of the ball so that the ball is retained in a snap manner. In other words, the ball is snapped into the receiving portion 20, and is held there without being lost. The diameter D1 is then embodied such that the ball can not pass through the bottom 14 of the sleeve or the bottom 14 of the sleeve can be pulled towards the support surface 18 in the direction of arrow 21 through the ball . By doing so, the sleeve bottom 14 and the external track device 8 are prevented from moving in the direction of the support plate 16 in a shape-fitting manner by the balls.

The receiving portion 20 may be formed, for example, in rotational symmetry in the axial plan view or may be formed by a plurality of radially running tongues.

1: Eccentric assembly
2: input shaft
3: plunger
4: Eccentric shaft section
5: Housing
6: Bearing device
7: Rolling bearing device
8: External track system
9: Internal track
10: External track
11: Rotor chamber
12: Rotating body
13: Jacket cotton
14: Sleeve bottom
15: end face
16: Support plate
17: Support element
18: Support surface
19: Through opening
20:
21: Arrow
D0, D1, D2: Diameter
E: Eccentric shaft
H: Main rotation axis

Claims (10)

An eccentric assembly (1) comprising:
A housing,
An eccentric shaft section (4) for eccentrically rotating about a main rotational axis (H), comprising: an eccentric shaft section (4) for providing or supporting an internal track (9);
The rolling bearing device 7 is arranged on the eccentric shaft section 4 and defines an eccentric axis E and is provided with a plurality of rotating bodies 12 and one outer raceway device 8, Wherein the outer raceway device (8) provides an outer raceway (10) for the rotor body (12), the rotor body (12) comprising an inner raceway (9) and an outer raceway 10, a rolling bearing device 7;
The support element (17) as a support member (17) and support surface (18) as a support partner is operatively resting on a support surface (18), which together with the eccentric shaft section One of the support partners being fixedly disposed on the housing and the other support member being supported on the eccentric shaft section 4 and a support element 17 and a support surface 18 (1) according to claim 1,
Characterized in that the support surface (18) is fixedly disposed on the housing. An eccentric assembly (1) according to claim 1, characterized in that the support element (17) is supported by an external track device (8) in a radial direction. 3. Eccentric assembly (1) according to claim 1 or 2, characterized in that the outer raceway device (8) is held by a support element (17) axially with respect to the support surface (18). 4. An eccentric assembly (1) according to any one of claims 1 to 3, characterized in that the support element (17) is formed as a ball. 5. A device according to any one of claims 1 to 4, characterized in that the eccentric assembly (1) comprises a support plate (16), which is fixedly arranged in the housing (5) (18). ≪ / RTI > 6. An eccentric assembly (1) according to any one of claims 1 to 5, characterized in that the outer track device (8) has a receiving portion (20) for the support element (17). An eccentric assembly (1) according to claim 6, characterized in that the receptacle (20) is formed as a snap receptacle. 8. An eccentric assembly (1) according to any one of claims 1 to 7, characterized in that the outer track device (8) is formed as a sleeve. The eccentric assembly (1) according to claim 8, characterized in that the receptacle (20) is molded in a sleeve. In the ABS system pump 22,
A pump for an ABS system, comprising an eccentric assembly (1) according to any one of claims 1 to 9.

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