CN106285815A - Camshaft adjuster - Google Patents

Abstract

The invention relates to a camshaft adjuster. The camshaft adjuster has a drive wheel, a stator and a rotor, the rotor is configured to be connected to the camshaft in a relatively non-rotatable manner, the stator and the drive wheel are connected to each other in a relatively non-rotatable manner, wherein the rotor and the stator are The shaft is also located in the stator, and the rotor and the stator are configured as two opposing working chambers for the relative rotation of the rotor and the stator, the working chambers are sealed by sealing lips, and the sealing lips are arranged on the rotor The vane slot on the vane, and the leaf spring is pressed between the bottom of the vane slot and the sealing lip. According to the invention, the sealing lip has an asymmetric mounting which cooperates with the bottom of the vane groove. The camshaft adjuster of the present invention has a mistake-proof structure, which prevents the sealing lip from being wrongly assembled on the camshaft adjuster.

Description

camshaft adjuster

technical field

The invention relates to a camshaft adjuster.

Background technique

Camshaft adjusters are used in internal combustion engines to adjust the relative angle between the camshaft and the crankshaft to change the valve timing. Consumption and emissions are reduced when valve timing is matched to the current load. Common camshaft adjusters are generally vane chamber adjusters with a stator, a rotor and a drive wheel. The rotor is in most cases connected to the camshaft in a non-rotatable manner. The stator and the drive wheel are also connected to each other in a non-rotatable manner, wherein the rotor is coaxial with the stator and is located inside the stator. The rotor and the stator delimit pressure chambers which can be acted upon by oil pressure and which allow a relative movement between the stator and the rotor.

A camshaft adjuster is known from CN102652208A. A camshaft adjuster of this type comprises a plurality of pressure chambers arranged in the circumferential direction, which enable a twisting of the rotor relative to the stator when pressure is applied. Thus, the phase of the camshaft can be changed relative to the phase of the drive wheels by means of the application of pressure. The drive wheels are driven via the crankshaft of the internal combustion engine by means of a traction mechanism. By adjusting the phase of the camshaft, the valve timing of the inlet and outlet valves can be changed, so that the control of the valves can be optimized according to the operating point of the internal combustion engine.

In order to realize the sealing between the pressure chambers, CN102652208A adopts a sealing lip and a leaf spring assembly, the sealing lip is arranged in the blade groove on the rotor blade, and the spring leaf is pressed against the bottom of the sealing lip and the blade groove of the rotor blade between. Assembly of the sealing lip and leaf spring assembly is currently performed manually. Furthermore, the sealing lips generally have a symmetrical configuration. Due to manual assembly, the problem of installing the sealing lip and leaf spring assembly in the wrong circumferential direction may occur, as shown in Figure 1, where 1' is the rotor, 2' is the vane, 3' is the sealing lip, and 4' is the spring leaf . Problems that can also occur are components installed with the wrong size, as shown in Figure 2, where 1" is the rotor, 2" is the blade, 3" is the sealing lip, and the leaf spring is not shown. For these problems, apart from inspection and air There is currently no effective way to find these problems other than the air tightness test. However, inspection requires more manpower. On the other hand, although the air tightness test can find the problem, the camshaft adjuster must be disassembled after the problem is found. Then reassemble.

Contents of the invention

The object of the present invention is to provide a camshaft adjuster which has a mistake-proof structure in order to avoid incorrect assembly of sealing lip and leaf spring assembly.

According to the invention, this object is solved in that the camshaft adjuster has a drive wheel, a stator and a rotor, the rotor is designed to be connected to the camshaft in a rotationally fixed manner, and the stator and the drive wheel are non-rotatably connected to each other. connection, wherein the rotor is coaxial with the stator and is located inside the stator, and the rotor and the stator are configured for two opposing working chambers for the relative rotation of the rotor and the stator, and the working chambers are separated by a sealing lip Sealing, the sealing lip is arranged in the blade groove on the rotor blade, and the spring leaf is pressed between the bottom of the blade groove and the sealing lip, characterized in that the sealing lip has a An asymmetric mounting part that fits on the bottom. Due to the asymmetric mounting, incorrect assembly of the sealing lip can be prevented.

According to an embodiment of the present invention, a boss is provided on the body of the sealing lip as a mounting portion, and a corresponding groove is provided on the blade groove of the rotor blade, and the groove cooperates with the boss. In this way, fitting of the sealing lip in the wrong circumferential direction can be prevented.

Preferably, the sealing lip is provided with at least two protrusions, and the rotor is provided with at least two grooves.

According to an embodiment of the present invention, the protrusions have different shapes and/or lengths. One shape may be, for example, cylindrical and the other shape may be, for example, square cylinder. Alternatively, the distance between one stud and one end of the sealing lip is different from the distance between the other stud and the other end of the sealing lip. In this way, fitting of the sealing lip in the wrong axial direction can be prevented.

According to another embodiment of the invention, the distance between the bosses can vary. In this way, fitting of the wrong type of sealing lip can be avoided.

Preferably, the body of the sealing lip is U-shaped, and the protrusion protrudes from two legs of the U-shape.

According to another embodiment of the present invention, the sealing lip is U-shaped, and the two legs of the U-shape are used as mounting parts with different lengths, and the bottom of the vane groove is recessed at the end matching the longer leg with respect to the other end.

Preferably, the sealing lip comprises a receptacle in which the leaf spring is received. According to an embodiment of the invention, both the receiving portion and the spring leaf have a symmetrical configuration.

The camshaft adjuster of the present invention has a mistake-proof construction, which avoids assembling the sealing lip in the wrong direction (circumferential and axial). For example, if the assembly direction is wrong, because the boss interferes with the inner wall of the stator (when the circumferential direction is wrong) or the boss does not match the groove (when the axial direction is wrong), or the blade cannot be inserted because the sealing lip has a different length of the mounting part groove (in the wrong axial or circumferential direction), so that the seal lip and rotor cannot be assembled in the wrong direction.

The camshaft adjuster of the present invention also avoids installation of wrongly sized components. If the sealing lip and rotor are of different sizes, different sized rotors and sealing lips will not be assembled because the studs will also not fit into the grooves or the sealing lips will not fit into the vane slots because the sealing lips have mounting portions of different lengths. The camshaft adjuster of the invention also makes it possible to avoid assembling different types of sealing lips and rotors in the case of sealing lips and rotors of the same size but of different types (the distance between the bosses differs from the distance between the grooves) stand up.

Description of drawings

Embodiments of the invention will be illustrated in more detail in the accompanying drawings, in which

Fig. 1 is a schematic diagram of the seal lip and leaf spring assembly installed on the rotor in the wrong circumferential direction in the prior art;

Fig. 2 is a schematic diagram of installing a sealing lip with wrong size on the rotor in the prior art;

Fig. 3 is a schematic diagram of the sealing lip of the embodiment of the present invention, wherein the bosses have different shapes;

Fig. 4 is a schematic diagram of a rotor according to an embodiment of the present invention, wherein grooves have corresponding different shapes;

Fig. 5 is a schematic diagram of installing the sealing lip on the rotor according to an embodiment of the present invention;

Fig. 6 is a schematic diagram of preventing wrong installation of the sealing lip according to an embodiment of the present invention, wherein the distance between the bosses is different from the distance between the grooves of the rotor;

Fig. 7 is a schematic diagram of another embodiment of the present invention to prevent wrong installation of the sealing lip, wherein the shape of the boss does not match the shape of the groove;

Fig. 8 is a schematic diagram of a sealing lip according to another embodiment of the present invention, wherein the sealing lip has mounting portions of different lengths; and

Fig. 9 shows a schematic view of the sealing lip shown in Fig. 8 to prevent wrong installation on the rotor.

In the drawings, embodiments of the invention are shown simplified for clarity, and like parts are denoted with like reference numerals.

List of reference signs

1’ rotor

2’ blade

3’ sealing lip

4’ leaf spring

1” rotor

2” blade

3” sealing lip

1 rotor

2 blades

3 sealing lip

5 bosses

6 grooves

7 vane groove

10 rotors

20 blades

30 sealing lip

50 post

60 grooves

110 rotor

120 blades

130 sealing lip

150 boss

160 grooves

210 rotor

220 blades

230 sealing lip

260 grooves

detailed description

A camshaft adjuster and a sealing lip according to an embodiment of the present invention will be described below with reference to FIGS. 3-7 . For clarity, the leaf springs are not shown in the drawings.

Figure 4 shows a camshaft adjuster, which has a drive wheel (not shown), a stator (not shown) and a rotor 1, the rotor 1 is configured to be fixedly connected to the camshaft (not shown), the stator and The drive wheels are also fixedly connected to each other, the rotor 1 is coaxial with the stator and located inside the stator, and the rotor 1 and the stator define two opposing working chambers for the relative rotation of the rotor and the stator. The drive wheel is driven by the crankshaft of the internal combustion engine via a traction mechanism (eg chain, toothed belt). The working chambers are sealed by sealing lips 3 (see Figure 3). In an embodiment, the rotor 1 has blades 2 on which blade grooves 7 are provided. As shown in FIG. 5 , the sealing lip 3 is arranged in the vane groove 7 . A leaf spring can be arranged between the sealing lip 3 and the bottom of the vane groove 7, so that the sealing lip 3 is pressed against the rotor blade 2 and the inner wall of the stator, thereby achieving a seal. In an embodiment, the sealing lip has a symmetrical receptacle for receiving a likewise symmetrical spring leaf.

FIG. 3 shows the sealing lip 3 of the embodiment of the present invention, and the sealing lip 3 is provided with a boss 5 . Correspondingly, as shown in FIG. 4 , the rotor 1 is provided with a correspondingly shaped groove 6 on the bottom of the blade groove 7 so that the groove 6 cooperates with the boss 5 . In the embodiment, the sealing lip 3 is U-shaped, and two protrusions 5 of different shapes are provided on its two legs, one is cylindrical and the other is square, and the rotor 1 is correspondingly provided with two Groove 6 of corresponding shape. However, the protrusions 5 and the grooves 6 can be in other shapes. In addition, the number of posts and grooves can be more than two, or even one. Furthermore, it is also possible for the studs to have different lengths.

Since the sealing lip 3 is provided with a protruding post 5, if the sealing lip 3 is installed in a wrong circumferential direction, the protruding post 5 will interfere with the inner wall of the stator, so that the installation cannot be performed. If the size of the sealing lip 3 and the rotor 1 are different, the boss 5 cannot match the groove 6 either.

The distance between the studs and the corresponding ends of the sealing lip can be varied to form different types of sealing lips. The distance between the grooves varies accordingly. FIG. 6 shows the assembly of sealing lips 30 and rotors 10 of the same size but different types. Due to the different types, the distance between the bosses 50 and the distance between the grooves 60 of the blade 20 do not match, so the assembly cannot be performed.

FIG. 7 shows the situation where the sealing lip 130 of the embodiment of the present invention is installed on the blade 120 of the rotor 110 in the wrong axial direction. Since the protrusion 150 on the sealing lip 130 has a different shape, in the case of an axial error, the shape of the protrusion 150 will not match the shape of the groove 160, so that the installation cannot be performed.

Alternatively, the distance between one boss and one end of the sealing lip may be different from the distance between another boss and the other end of the sealing lip. In the case of axial misalignment, this also prevents the sealing lip from being mounted on the blade.

FIG. 8 shows a sealing lip 230 according to another embodiment of the present invention, which has an asymmetric mounting portion. As shown in FIG. 8, the sealing lip 230 is U-shaped, and the two legs have different lengths. In an embodiment, the sealing lip also has a symmetrical receptacle for receiving a likewise symmetrical spring leaf

As shown in FIG. 9 , one end of the blade groove of the blade 220 of the rotor 210 mated with the longer leg of the sealing lip 230 is recessed relative to the other end to form a groove 260 . FIG. 9 also shows a leaf spring (not shown) being pressed between the sealing lip 230 and the bottom of the vane groove of the vane 220 . If the sealing lip 230 is assembled from other directions, the sealing lip 230 cannot be inserted into the vane groove.

In some cases, features described in the specification may be used as such independently of other features. On the other hand, the features described in the specification can also be combined as required to provide various combinations. For example, it is also possible for the sealing lip to have both studs and legs of different lengths.

The drawings and the related description are only intended to illustrate the idea of the present invention. The details of the invention may vary within the scope of the claims.

Claims (10)

1. a camshaft adjuster, it has driving wheel, stator and rotor, and rotor is constructed For being connected with camshaft in the most relatively turnable mode, stator with driving wheel can not relative turn Dynamic mode is connected to each other, and wherein, described rotor is coaxial with stator and is positioned at stator, and Described rotor and described stator structure are for rotor and stator two opposition effects in relative rotation Working chamber, is sealed by sealing lip between described working chamber, and described sealing lip is disposed in rotor In blade groove on blade, and spring pressure leans against the bottom of described blade groove and described sealing Between lip, it is characterised in that described sealing lip has non-with what the bottom of described blade groove coordinated Symmetrical installation portion.

2. camshaft adjuster as claimed in claim 1, it is characterised in that it is characterized in that, Described sealing lip is U-shaped, and two supporting legs of U-shaped have different length, institute as installation portion State one end that the bottom of blade groove coordinates with relatively long leg to cave in relative to the other end.

3. camshaft adjuster as claimed in claim 1, it is characterised in that it is characterized in that, The body of described sealing lip is provided with projection as installation portion, the blade groove of described rotor blade Bottom is provided with corresponding groove, and described groove coordinates with described projection.

4. camshaft adjuster as claimed in claim 3, it is characterised in that described sealing lip It is provided with at least two projection.

5. camshaft adjuster as claimed in claim 4, it is characterised in that described projection has There are different shapes and/or length.

6. camshaft adjuster as claimed in claim 5, it is characterised in that is shaped as Cylinder, another is shaped as square column type.

7. the camshaft adjuster as according to any one of claim 3-6, it is characterised in that Distance between described projection can change.

8. the camshaft adjuster as according to any one of claim 3-6, it is characterised in that Distance between one projection and an end of described sealing lip is different from another projection and institute State the distance between another end of sealing lip.

9. the camshaft adjuster as according to any one of claim 3-6, it is characterised in that The body of described sealing lip is U-shaped, and described projection is protruding from the two legs of U-shaped.

10. the camshaft adjuster as according to any one of claim 1-6, it is characterised in that Described sealing lip includes that receiving portion, described spring leaf are received within described accommodation section.