DE102018203717A1 - Arrangement of a pump on a motor housing - Google Patents

Abstract

The invention relates to an arrangement, in particular of a vehicle comprising a motor housing of an internal combustion engine, a motor housing fixed to the pump housing, a projecting from the pump housing shaft, and a drive wheel on the shaft for receiving a rotating traction means, and arranged outside of the pump housing Bearing arrangement for rotatably supporting the shaft.

Description

The present invention relates to an arrangement comprising a motor housing of an internal combustion engine and a pump attached to the motor housing. The arrangement is used in particular in a vehicle.

Arrangements are known from the prior art, in which a pump is attached to a motor housing. The engine housing is usually a cylinder crankcase. The pump may e.g. be designed as a high-pressure pump for injection or as an oil pump. A wave protrudes from the pump. On this shaft is a drive wheel, such as a sprocket. About a corresponding traction means, such as a chain, the drive wheel is connected to the crankshaft of the engine. As a result, the shaft and consequently the pump are set in rotation via the internal combustion engine.

This torque transfer to the pump should lead to the least possible vibrations and in particular the lowest possible acoustic interference. In particular, when using timing chains it comes due to the polygon effect to vibrational excitations and acoustic impairments.

It is an object of the present invention to provide an arrangement with motor housing and pump, which allows a low-maintenance and safe operation of the internal combustion engine with the least possible acoustic interference.

The solution of this object is achieved by the features of the independent claim. The dependent claims relate to advantageous embodiments of the invention.

Thus, the object is achieved by an arrangement comprising a motor housing of an internal combustion engine and a pump attached to the motor housing. The arrangement is preferably located in a vehicle. The vehicle is in particular a road vehicle.

The engine housing is preferably designed as a cylinder crankcase and thus comprises the cylinder and the crankshaft bearing of the internal combustion engine.

On the motor housing, the pump is attached, in particular flanged. The pump is preferably a high-pressure pump for injecting fuel into the internal combustion engine. Alternatively, the pump may, for example, also be an oil pump for conveying lubricant of the internal combustion engine.

The attached to the motor housing pump includes a pump housing and a projecting from the pump housing shaft. Within the pump housing, the rotating shaft leads to the pumping of the corresponding fluid. Outside the pump housing, the shaft is rotatably connected to a drive wheel. The drive wheel serves to receive a rotating traction means. Torque is transmitted directly or indirectly from the crankshaft of the internal combustion engine via this traction means. Preferably, the drive wheel is a sprocket, wherein the traction means is formed as a chain.

Outside the pump housing, a bearing assembly is provided. The bearing assembly is designed for rotatably supporting the shaft. According to the invention, the shaft is thus not only stored in the pump housing, but also outside of the pump housing. This bearing arrangement is located in particular between the drive wheel and the pump housing. By using the bearing assembly outside the pump housing, the projecting length of the shaft is shortened. Therefore, the distance between the drive wheel and the first bearing of the shaft shortens. As a result, the shaft is less susceptible to vibrations induced via the drive wheel due to, for example, the polygon effect. This leads to a lower load on all bearings of the shaft and thus to a lower load on the pump. At the same time, acoustic impairments are avoided.

Preferably, the shaft is sealed at the inlet to the pump housing. A corresponding seal (also: shaft seal) is thus located in the pump housing. This region of the pump housing with the seal represents in particular the "end" of the pump housing facing the drive wheel. All components which are located outside the sealed pump housing, including the bearing arrangement described here, are consequently located "outside the pump housing".

In a preferred embodiment, it is provided that the bearing arrangement supports the shaft relative to the motor housing. Preferably, the motor housing is formed so that it surrounds the shaft and the bearing assembly in the area between the pump housing and the drive wheel. The radial outer side of the bearing assembly is preferably located directly on the motor housing.

The bearing arrangement is preferably designed as a sliding bearing or rolling bearing.

In a simple embodiment of the bearing assembly as a plain bearing this includes only a socket in which the shaft rotates.

Furthermore, it is preferably provided that the shaft is mounted in the pump housing at at least one, preferably at least two, pump bearing point (s). In particular, there are exactly two pump bearing points in the pump housing.

Due to the multiple pump bearings and arranged outside the pump housing bearing assemblies may under certain circumstances come to over-determination of storage. In order to avoid resulting negative effects, it is preferably provided that the bearing arrangement comprises at least one elastic element. This elastic element is in particular made of an elastomer. The entire bearing arrangement including the elastic element may in particular be a composite element made of elastomer and metal.

By using the elastic element in the bearing arrangement, a decoupling of this bearing arrangement is possible in order to avoid a static overdetermination of the shaft.

Particularly preferably, it is provided that the bearing arrangement comprises an inner ring and an outer ring and the at least one elastic element between the inner ring and outer ring is arranged. As a result, the elastic element allows an elastic relative movement between the inner ring and the outer ring. The inner ring is on the shaft. The outer ring is preferably located in the motor housing.

The invention further comprises a vehicle, in particular designed as a road vehicle, with the described arrangement.

• 1 eine schematische Ansicht einer erfindungsgemäßen Anordnung, und
• 2 eine schematische Detailansicht der erfindungsgemäßen Anordnung mit einem elastischen Element in der Lageranordnung.

Further details, features and advantages of the invention will become apparent from the following description and the figures. Show it:

• 1 a schematic view of an inventive arrangement, and
• 2 a schematic detail view of the inventive arrangement with an elastic element in the bearing assembly.

1 shows an arrangement 1 with motor housing 2 and pump 3 , The arrangement is used in particular in a road vehicle.

The motor housing 2 and the pump 3 are shown only in sections. In the motor housing 2 it is a cylinder crankcase of an internal combustion engine. The pump 3 For example, it can be designed as a high-pressure pump or oil pump for the internal combustion engine.

As 1 shows is the pump 3 with their pump housing 4 on the motor housing 2 attached. This attachment of the pump housing 4 on the motor housing 2 can be done in any way, for example, with a flange, not shown.

The pump 3 included a wave 5 coming out of the pump housing 4 protrudes. Inside the pump housing 4 guides the rotating shaft 5 to pump the corresponding liquid, for example fuel or oil. The exact structure for pumping inside the pump housing 4 can be designed arbitrarily and is not shown here.

1 shows that the wave 5 inside the pump housing 4 over two pump bearings 6 is stored. At its exit from the pump housing 4 is the wave 5 about a seal 8th sealed.

At the projecting end of the shaft 5 there is a drive wheel 7 , The drive wheel 7 is designed here as a sprocket. The drive of the drive wheel 7 and thus the wave 5 and the pump 3 done via a chain.

1 shows that on the shaft 5 another sprocket 20 can be arranged. About this further sprocket 20 For example, a timing chain, for example for controlling the valves of the internal combustion engine, can be driven.

Between the drive wheel 7 and the pump housing 4 includes the arrangement 1 a bearing assembly 10 for storage of the shaft 5 opposite the motor housing 2 ,

In 1 this is a simple plain bearing with the plain bearing shown 11 as a socket.

Preferably, the bearing assembly 10 supplied with a lubricant via a corresponding lubrication channel. This lubricant occurs on both sides of the bearing assembly 10 and thus also accumulates in the cavity between the bearing assembly 10 and pump housing 4 , As a result, an opening is preferably 12 in the motor housing 2 provided to remove the lubricant from the cavity between bearing assembly 10 and pump housing 4 drain.

2 shows an alternative embodiment of the bearing assembly 10 , In the 2 schematically illustrated bearing assembly 10 includes an inner ring 13 , an outer ring 14 and an elastic element 15 between inner ring 13 and outer ring 14 , Through this elastic element 15 There is a certain decoupling of the bearing assembly 10 opposite the motor housing 2 , This can be any disadvantages of the static over-determination of the shaft 5 through the three bearings (bearing arrangement 10 and two pump bearings 6 ) be avoided.

In both embodiments of the bearing assembly shown here 10 can be a vibration of the cantilevered shaft 5 be avoided as far as possible. In particular, in the design of the drive wheel 7 as a sprocket and the use of a chain thus resulting from the polygon effect chain whining can be largely avoided.

LIST OF REFERENCE NUMBERS

1

arrangement

2

motor housing

3

pump

4

pump housing

5

wave

6

Pump bearings

7

drive wheel

8th

poetry

10

bearing arrangement

11

bearings

12

opening

13

inner ring

14

outer ring

15

elastic element

20

Sprocket

Claims (10)

Arrangement (1), in particular of a vehicle, comprising A motor housing (2) of an internal combustion engine, • a pump (3) attached to the motor housing (2) with ◯ a pump housing (4), ◯ one of the pump housing (4) protruding shaft (5), and ◯ a drive wheel (7) on the shaft (5) for receiving a rotating traction means, • And a outside of the pump housing (4) arranged bearing assembly (10) for rotatably supporting the shaft (5). Arrangement according to Claim 1 in that the bearing arrangement (10) supports the shaft (5) with respect to the motor housing (2). Arrangement according to one of the preceding claims, wherein the bearing assembly (10) is designed as a sliding bearing or rolling bearing. Arrangement according to one of the preceding claims, wherein the shaft (5) in the pump housing (4) is mounted on at least one, preferably at least two, pump bearing point (s) (6). Arrangement according to one of the preceding claims, wherein the bearing assembly (10) comprises at least one elastic element (15), preferably made of elastomer. Arrangement according to Claim 5 , wherein the bearing assembly (10) comprises an inner ring (13) and an outer ring (14) and the at least one elastic element (15) between the inner ring (13) and outer ring (14) is arranged. Arrangement according to one of the preceding claims, wherein the motor housing (2) is designed as a cylinder crankcase. Arrangement according to one of the preceding claims, wherein the drive wheel (7) as a sprocket (20) is formed. Arrangement according to one of the preceding claims, wherein the pump (3) is designed as a high-pressure pump for injecting fuel into the internal combustion engine or as an oil pump for pumping a lubricant of the internal combustion engine. Vehicle, in particular road vehicle, comprising an arrangement (1) according to one of the preceding claims.

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