CN206386363U - Mechanical device with axial preload - Google Patents

Abstract

A mechanical device with an axial pretensioning part, comprising: a shaft, a pretensioning elastic part and the pretensioning part; the shaft is provided with a radially outward protrusion, the pretensioning elastic part and the pretensioning The parts are all set on the shaft; the mechanical device also includes: a stop part, which is fixedly connected with the shaft; Arranged in sequence in the axial direction, the pre-tensioned elastic members are pressed by the outer protrusions and the pre-tensioned parts to maintain compression deformation; and axially abut against the stopper portion, so as to keep the axial preload to prevent the relative rotation of the preloaded member and the shaft. The technical solution can reduce the precise requirements on the installation and cooperation between the pre-tightened elastic member and the shaft.

Description

Mechanism with axial preload

technical field

The utility model relates to the technical field of machinery, in particular to a mechanical device with an axial pretensioning member.

Background technique

An existing P2 hybrid power module includes a motor with a rotor and a flange shaft, and the flange shaft has a torque output end for transmitting the output torque of the engine to the gearbox.

An outer ring is arranged at the torque output end of the flange shaft, and the outer ring surrounds the flange shaft and is fixedly connected with the flange shaft, and defines an accommodating space with the flange shaft. The rotor is sleeved on the flange shaft and inserted into the accommodation space.

A ball bearing is arranged between the outer ring and the rotor, and the ball bearing is sleeved on the rotor, so that the flange shaft is rotationally connected with the rotor through the outer ring. One end of the rotor located outside the accommodation space is provided with a radially outward protrusion, and one end located in the accommodation space is sheathed with a pre-tension spring. The ball bearing is located between the radially outward protrusion and the pre-tightening spring, and the pre-tightening spring has the functions of providing the ball bearing with axial pre-tightening force and preventing falling off.

On the one hand, the preload spring deforms in the axial direction to provide axial preload to the ball bearing, and the ball bearing maintains axial preload between the radially outer protrusion and the preload spring, blocking the inner ring of the rolling bearing from the rotor Relative rotation occurs. On the other hand, the pre-tightening spring and the rotor are fixedly connected through a tight fit to prevent the pre-tightening spring from falling off in the axial direction.

However, this places precise requirements on the fit between the preload spring and the rotor:

If the preload spring fits too tightly with the rotor, it is necessary to use an additional tool to provide a large axial force to the preload spring to overcome the large frictional force between the preload spring and the rotor. On the one hand, this makes assembly difficult and the cost is higher; on the other hand, the large axial force is transmitted to the flange shaft, other parts connected to the flange shaft, and parts near the flange shaft, resulting in some parts risk of breaking. Furthermore, too tight fit will limit the axial deformation displacement of the preload spring, and the axial preload effect of the preload spring on the ball bearing is not good, and the ball bearing may rotate relative to the rotor.

If the preload spring is loosely fitted to the rotor, the risk of the preload spring falling off increases, and the effect of the preload spring on preventing the ball bearing from falling off is not good.

Utility model content

The problem solved by the utility model is how to reduce the precise requirements for the installation and cooperation between the pre-tightening elastic part and the shaft in a mechanical device with an axial pre-tightening part.

In order to solve the above problems, the utility model provides a mechanical device with an axial pretensioning member. The mechanical device includes: a shaft, a pre-tightening elastic part and the pre-tightening part; the shaft is provided with a radially outward protrusion, and the pre-tightening elastic part and the pre-tightening part are both sleeved on the shaft; The mechanical device also includes: a stop part fixedly connected to the shaft; the protruding part, the pre-tightening elastic part, the pre-tightening part and the stop part are arranged in sequence along the axial direction of the shaft, and the pre-tightening The elastic member is squeezed by the external protrusion and the pre-tensioned part to maintain compression deformation; along the axial direction, the pre-tensioned part is axially abutted against the stopper by the axial elastic force exerted by the pre-tensioned elastic part Rely on, so as to maintain the axial preload to block the relative rotation of the preloaded part and the shaft.

Optionally, the pre-tensioned elastic member is a coil spring or a diaphragm spring.

Optionally, the stopper is a retaining ring passing through the shaft.

Optionally, the retaining ring is fixedly connected to the shaft in an interference fit manner.

Optionally, the two radially opposite surfaces of the retaining ring and the shaft are both truncated conical surfaces, and along the axial direction, from the pre-tensioning member to the direction of the retaining ring, the radius is equal to slowing shrieking.

Optionally, along the axial direction, the stop portion faces away from the side of the pre-tensioned member, and the shaft has a radially outward flange; the outward flange is axially aligned with the stop portion against.

Optionally, the stop part is a stop elastic member, which applies an axial elastic force to the pre-tensioned member for axial pre-tightening.

Optionally, the stop elastic member includes: a base ring fixedly connected to the shaft;

The deformation section is located at one end of the base ring axially facing the pre-tensioned part, and elastically deforms radially outward when abutting against the pre-tensioned part in the axial direction.

Optionally, the outer peripheral surface of the shaft has a groove, and the groove surrounds the central axis of the shaft; the stop elastic member is clamped in the groove.

Optionally, the member to be preloaded is a bearing.

Optionally, the shaft is a rotor capable of rotating around its own central axis.

Optionally, the mechanical device is a P2 hybrid power module, including: a motor, the shaft is the rotor of the motor; a transmission shaft has a torque output end in the axial direction; the transmission shaft is provided at the torque output end There is an outer ring, the outer ring surrounds the transmission shaft and is fixedly connected with the transmission shaft, defines an accommodating space with the transmission shaft, the rotor is sleeved on the transmission shaft and inserted into the accommodating space, at least the stopper and the to-be-tensioned part are accommodated in the accommodating space; the to-be-preloaded part is a bearing, and the transmission shaft is connected to the rotor through an outer ring as a bearing.

Compared with the prior art, the technical solution of the utility model has the following advantages:

Both the pre-tightening elastic part and the pre-tightening part are sleeved on the shaft, and the pre-tightening elastic part, the pre-tightening part and the stop part are sequentially arranged along the axial direction of the shaft. The pre-tensioned part receives the axial elastic force exerted by the pre-tensioned elastic part and axially abuts against the stopper part. The pre-tightened elastic member can provide axial pre-tightened force for the pre-tightened part, and the pre-tightened part is axially pre-tightened between the pre-tightened elastic part and the stop part, so as to prevent the relative rotation of the pre-tightened part and the shaft. At the same time, the stop part can prevent the to-be-tightened part and the pre-tightened elastic part from falling off.

Since the pre-tightening elastic part does not need to play the role of preventing falling off, it can reduce the precise requirements for the installation and fit between the pre-tightening elastic part and the shaft, and the pre-tightening elastic part and the shaft can be loosely fitted, which can bring the following benefits : On the one hand, the pre-tensioned elastic part can pass through the shaft easily, no additional tools are required during assembly, the assembly of the pre-tensioned elastic part is simple, and the cost is low; The elastic part causes damage; moreover, the pre-tightened elastic part can ensure the required amount of compression deformation and meet the axial pre-tightening requirements of the pre-tightened part.

Description of drawings

Fig. 1 is a sectional view of a mechanical device with an axial pretensioning member according to a specific embodiment of the present invention;

Fig. 2 is a schematic diagram of the cooperation relationship between the stopper and the shaft in the mechanical device shown in Fig. 1;

Fig. 3 is a cross-sectional view of a mechanical device with an axial pretensioning member according to a modified example of the present invention;

Fig. 4 is a perspective view of the stop part in the mechanical device shown in Fig. 3 in a natural state;

Fig. 5 is a plan view of a portion of the mechanical device shown in Fig. 3 where the shaft cooperates with the stopper.

detailed description

In order to make the above purpose, features and advantages of the utility model more obvious and easy to understand, specific embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings.

Referring to FIG. 1 , a mechanical device with an axial pretensioning part 1 includes: a shaft 2, a pretensioning elastic part 3 and a pretensioning part 1; the shaft 2 has a radially outward protrusion 4, and the pretensioning elastic part 3 And to be preloaded part 1 all sleeves on the axle 2. The mechanical device also includes: a stopper 5 fixedly connected with the shaft 2 . The outer protrusion 4, the pre-tensioned elastic part 3, the pre-tensioned part 1 and the stop part 5 are arranged in sequence along the axial direction of the shaft 2, and the pre-tensioned elastic part 3 is squeezed by the outer protrusion 6 and the pre-tensioned part 1 Holds compression set. In the axial direction, the pre-tensioned part 1 is axially abutted against the stopper 5 by the axial elastic force exerted by the pre-tensioned elastic part 3 , so as to keep the axial pre-tension to prevent the relative rotation of the pre-tensioned part 1 and the shaft 2 .

The pre-tensioned elastic member 3 is located between the outer protrusion 4 and the pre-tensioned part 1, and provides an axial pre-tightening force for the pre-tensioned part 1, so that the pre-tensioned part 1 and the stopper 5 axially abut against each other, thereby keeping the shaft to preload. The pre-tensioned elastic member 3 can provide axial pre-tightening force for the pre-tightened part 1, and the pre-tightened part 1 is axially pre-tightened between the pre-tightened elastic part 3 and the stop part 5, preventing the pre-tightened part 1 from contacting the shaft. 2 relative rotation. At the same time, the stop part 5 can prevent the to-be-tensioned part 1 and the pre-tensioned elastic part 3 from falling off.

Since the pre-tightening elastic part 3 does not need to play the role of preventing falling off, it can reduce the precise requirements for the installation and fit between the pre-tightening elastic part 3 and the shaft 2, and the pre-tightening elastic part 3 and the shaft 2 can be a loose fit, which is The following benefits can be brought: on the one hand, the pre-tightening elastic member 3 can easily pass through the shaft 2, no additional tools are required during assembly, the pre-tightening elastic member 3 is easy to assemble, high in efficiency, and low in cost; on the other hand, During the assembly process, the shaft 2 and the pre-tensioning elastic member 3 will not be damaged; moreover, the pre-tensioning elastic member 3 can ensure the required amount of compression deformation and meet the axial pre-tensioning requirement of the pre-tensioning member 1 .

The mechanical device here is a P2 hybrid power module, including: a motor 6, the shaft 2 is the rotor of the motor 1, and has a central hole 2a; a transmission shaft 7 has a torque output end 7a in the axial direction, and the transmission shaft 7 is connected to the motor through the torque output end 7a. The engine output torque is transmitted to the gearbox.

The transmission shaft 7 is provided with an outer ring 8 at the torque output end 7a, the outer ring 8 surrounds the transmission shaft 7 and is fixedly connected with the transmission shaft 7, and defines an accommodating space 8a with the transmission shaft 7, and the rotor is sleeved on the transmission shaft 7 and inserted into the accommodating space 8a , at least the stopper portion 5 and the pretensioned member 1 are accommodated in the accommodating space 8a. The preloaded part 1 is a bearing, and the transmission shaft 7 is connected with the rotor (shaft 2) through an outer ring 8 as a bearing.

When assembling, firstly, pass the pre-tightening elastic part 3 through the shaft 2 and pre-install it on the shaft 2, and the pre-tightening elastic part 3 is axially opposite to the outer protrusion 4; then, pass the bearing (pre-installation part 1) through it The outer ring 11 is fixedly connected with the inner peripheral surface of the outer ring 8; after that, the operating transmission shaft 7 passes through the central hole 2a of the shaft 2, and the bearing passes through the shaft 2 from the right side in Fig. 1 to be pre-installed on the shaft 2; finally, The operation stopper 5 is axially preloaded toward the bearing, and the bearing presses the preloaded elastic member 3 through its own inner ring 12 , and the preloaded elastic member 3 elastically deforms to provide axial preloaded force. The pretensioning elastic member 3 and the stopper portion 5 jointly perform axial pretensioning on the inner ring 12 to realize the purpose of axial pretensioning of the pretensioning member 1 .

The outer ring 8 is connected to the transmission shaft 7 through a connecting portion 9 . The connecting part 9 can be provided with an operation window (not shown in the figure), after the transmission shaft 7 and the shaft 2 are assembled, the stop part 5 is axially preloaded through the operation window, so that the stop part 5 is fixedly connected with the shaft 2 , and axially abut against the pretensioner 1.

The pre-tightening elastic member 3 is defined between the outer protrusion 4 and the inner ring 12 , there is sufficient space between the outer protrusion 4 and the inner ring 12 to limit the position of the pre-tightening elastic member 3 . Moreover, the outer protrusion 4 has a larger outer diameter, and the radially outer end of the pre-tightening elastic member 3 can be supported on the end surface of the outer protrusion 4, so that the pre-tightening elastic member 3 can undergo effective and sufficient elastic deformation.

The technical solution is described above by taking the mechanical device as the P2 hybrid power module as an example, and the technical solution can be especially applied to the mechanical device in which the axial preloading member is a bearing. In addition, for mechanical devices with other types of axial pretensioning parts, this technical solution can be applied by analogy.

The pre-tension elastic member 3 can be a diaphragm spring. Considering that the stop portion 5 occupies the axial dimension of the shaft 2, the axial dimension of the diaphragm spring is not large, which can meet the assembly requirements. Moreover, the axial pretightening force provided by the diaphragm spring will basically not decrease, which can meet the pretightening requirements of the pretensioned member 1 .

The diaphragm spring has a small end and a large end, the small end abuts against the preloaded member 1 , and the large end forms a separating finger, which abuts against the outer protrusion 4 . The diaphragm spring is elastically deformed by axial compression, and the separation finger will extend radially outward. At this time, the outer protrusion 4 has a sufficient outer diameter to support the separation finger, so as to prevent the separation finger from being higher than the outer protrusion in the radial direction 4. The diaphragm spring cannot be fully elastically deformed, resulting in that the pretensioned part 1 cannot be effectively pretensioned.

In addition to diaphragm springs, coil springs can be considered for preloaded elastic parts.

The stop part 5 can be a retaining ring, which passes through the shaft 2, and the retaining ring can surround the shaft 2 to maintain a balanced preload on the preloaded part 1. There is a large mating surface between the retaining ring and the preloaded part 1, which enhances The firmness of the pre-tensioning part 1 and the pre-tensioning elastic part 3.

The stopper 5 has an axial anti-falling effect on the pretensioned part 1, which requires the outer diameter of the stopper 5 to be larger than the inner diameter of the pretensioned part 1. Therefore, during the assembly process of the shaft 2 and the drive shaft 7, the pretensioned Before the component 1 is fixedly connected to the outer ring 8, the stopper 5 needs to be pre-installed in the accommodation space 8a, otherwise, the stopper 5 cannot be installed. Afterwards, the drive shaft 7 passes through the central hole 2a of the shaft 2, the pretensioner 1 passes through the shaft 2 before the stopper 5, and then the stopper 5 is pre-installed on the shaft 2; finally, through the connecting part 9 The operating window is axially preloaded against the stop 5 .

The retaining ring (stop part 5 ) is fixedly connected with the shaft 2 in an interference fit manner, which does not require an additional connection structure and is easy to operate. The retaining ring can be a rigid part, which is not easily deformed, can form a rigid connection with the shaft 2, and has a good stopping effect.

Referring to Fig. 2, the two radially opposite surfaces of the stopper 5 and the shaft 2 are conical surfaces without tops, and along the axial direction, the radius gradually decreases from the pretensioning part 1 to the direction B of the stopper 5 . In the mating surface between the stopper 5 and the shaft 2, the inner peripheral surface 53 of the stopper 5 and the outer peripheral surface 21 of the shaft 2 are conical surfaces with top removed, which can bring the following advantages:

On the one hand, it facilitates assembly. In the mating surface, in the direction away from the pretensioning member 1, the radii of the outer peripheral surface 21 of the shaft 2 and the inner peripheral surface 53 of the stopper 5 are gradually reduced, and the stopper 5 has a second hole with a larger aperture. One end A and a second end a with a smaller aperture, the shaft 2 has a small end b with a smaller outer diameter. During assembly, the first end A can easily pass through the shaft 2 starting from the small end b of the shaft 2, and the stopper 5 can be pre-installed on the shaft 2 very conveniently. During the preloading process, the inner peripheral surface 53 of the stopper 5 slides over the outer peripheral surface of the shaft 2 , and the outer peripheral surface 21 of the shaft 2 has a guiding effect on the stopper 5 .

On the other hand, a tight fit is favored. There is a large amount of interference between the small end b of the shaft 2 and the second end a of the stopper 5, and the interference refers to the distance between the central hole of the stopper 5 and the shaft 2 that are basically the same size and combined with each other. Cooperate with the elastic relationship, a larger amount of interference means that a tighter fit can be formed between the two, and the connection strength is high.

In the axial direction, the stop portion 5 faces away from the side of the pretensioning member 1, and the shaft 2 has a radially outward flange (not shown in the figure); the outward flange and the stop portion 5 can axially abut against each other, turning outward The edge has an anti-falling effect on the stopper 5 and strengthens the fixing effect of the stopper 5 . At this time, since the stop portion 5 and the shaft 2 are in an interference fit, the valgus edge does not need to be valgus in a large amount in the radial direction, and the shaft 2 is not damaged much.

In other alternative solutions, referring to FIG. 3 and FIG. 4 , the stop portion 50 may be a stop elastic member, and apply an axial elastic force to the pretensioning member 10 for axial pretensioning. In this alternative solution, the stop elastic member can have a compensating effect on the pre-tension elastic member 30, and both the pre-tight elastic member 30 and the stop elastic member can provide axial pre-tightening force to enhance the axial direction of the pre-tightening member 10. preload effect. However, the stop portion 50 has the effect of preventing falling off of the pretensioning member 1 and the pretensioning elastic member 30 , so there is no great requirement for the axial pretensioning force provided by the stopper elastic member.

Therefore, the stopper elastic member may include: a base ring 51, which is fixedly connected to the shaft 20; , it can elastically deform radially outward.

Before assembly, the deformation section 52 can extend along the axial direction of the base ring 51; when the stopper 50 is axially preloaded toward the pretensioned piece 10, the deformation section 52 is in contact with the to be pretensioned piece 10 and subjected to pretensioning. The tightening element 10 is extruded and elastically deformed radially outward, forming a barrier to the pretensioning element 10 .

The stop portion 50 may be a spring sheet, such as an elastic steel sheet, so that the deformation section 52 can be deformed and provide the required strength to prevent the pretensioning member 10 from falling off. The deformation section 52 may include several deformation fingers arranged along the circumferential direction of the base ring 51 .

In this case, referring to FIG. 5 , the outer peripheral surface 21 of the shaft 20 may have a groove 21a, and the groove 21a surrounds the central axis of the shaft 20; . Specifically, the stopper 50 can be clamped in the groove 21a through the base ring 51. The groove 21a has two side walls opposite to each other in the axial direction to form an axial fixation for the base ring 51, and the stopper 50 can be fixed on axis 20.

Along the axial direction of the shaft 20 , the outer diameter of one end of the shaft 20 used to fix the stopper 50 is smaller than the outer diameter of other parts, forming a groove 21 a near the side wall of the pretensioning member 10 . After the stopper 50 is pre-installed on the shaft 20, the right end of the shaft 20 can be turned outward to form an outer flange as the other side wall of the groove 21a.

Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model, so the protection scope of the present utility model should be based on the scope defined in the claims.

Claims (12)

1. a kind of mechanical device that there is axial direction to treat preload piece, including：Axle, pretension elastic component and described treat preload piece；

The axle is provided with radially outwardly projecting portion, the pretension elastic component and treats that preload piece covers on the shaft；

Characterized in that, also including：Stopper section, is fixedly connected with the axle；

The outwardly projecting portion, pretension elastic component, treat that preload piece and stopper section are arranged successively along the axial direction of the axle, the pretension elasticity Part is by outwardly projecting portion and treats that preload piece is extruded and keeps compression；

Along the axial direction, it is described treat preload piece by the axial elastic force that pretension elastic component applies with the stopper section axially against, Described treat that preload piece is relatively rotated with axle so as to keep axial pretightening to stop.

2. as claimed in claim 1 have the mechanical device for axially treating preload piece, it is characterised in that the pretension elastic component is Helical spring or diaphragm spring.

3. as claimed in claim 1 have the mechanical device for axially treating preload piece, it is characterised in that the stopper section is gear Circle, through the axle.

4. as claimed in claim 3 have the mechanical device for axially treating preload piece, it is characterised in that the back-up ring and the axle It is fixedly connected in an interference fit.

5. as claimed in claim 4 have the mechanical device for axially treating preload piece, it is characterised in that the back-up ring and the axle Two faces diametrically are the tip circle conical surface, and along the axial direction, the direction that preload piece points to the back-up ring is treated from described, Radius is gradually reduced.

6. as claimed in claim 4 have the mechanical device for axially treating preload piece, it is characterised in that described along the axial direction Stopper section has footpath outward flanging back to the side for treating preload piece, the axle；The flanging and stopper section axial direction Against.

7. as claimed in claim 1 have the mechanical device for axially treating preload piece, it is characterised in that the stopper section is backstop Elastic component, treats that preload piece applies axial elastic force to carry out axial pretightening to described.

8. as claimed in claim 7 have the mechanical device for axially treating preload piece, it is characterised in that the backstop elastic component bag Include：Substrate ring, is fixedly connected with the axle；

Deformation section, the one end for treating preload piece is axially faced toward positioned at described matrix ring, with it is described whne preload piece axially against when, Radially elastic deformation.

9. as claimed in claim 7 have the mechanical device for axially treating preload piece, it is characterised in that the periphery mask of the axle Fluted, the groove is around the axis of the axle；The backstop elastic component is arranged in the groove.

10. as claimed in claim 1 have the mechanical device for axially treating preload piece, it is characterised in that described to treat that preload piece is Bearing.

11. as claimed in claim 1 have the mechanical device for axially treating preload piece, it is characterised in that the axle is rotor, energy It is enough to be rotated around own central axis line.

12. as claimed in claim 1 have the mechanical device for axially treating preload piece, it is characterised in that the mechanical device is P2 hybrid power modules, including：

Motor, the axle is the rotor of the motor；

Power transmission shaft, vertically with torque output；

The power transmission shaft is provided with outer shroud in the torque output, and the outer shroud around the power transmission shaft and fixes company with power transmission shaft Connect, with the transmission axis limit receiving space, the rotor is enclosed on power transmission shaft and inserts the receiving space, at least described to stop Stopper and treat that preload piece is contained in the receiving space；

Described to treat that preload piece is bearing, the power transmission shaft is that bearing is connected by outer shroud and rotor.