CN204878642U - Drive arrangement and gear box thereof - Google Patents

Abstract

The utility model provides a drive arrangement and gear box thereof, includes motor and the gear box of being connected with the motor, the gear box includes the inferior valve, accepts the gear in the inferior valve and cover the lid of locating inferior valve one end. The inferior valve includes a back shaft, the back shaft supports the relative inferior valve of gear is rotatory, the back shaft is the cavity form, the gear box still include a dabber insert assemble in in the back shaft, the dabber is made by metal material, the back shaft is made by plastics. The utility model discloses the back shaft of gear box is made by plastics, its with low costs holding concurrently, and the shaping is simple. Additionally, the utility model discloses the dabber that still adopts metal material to make inserts to the back shaft in, in effective reduce cost, guarantees whole intensity, keeps driven stability.

Description

Drive unit and gear-box thereof

Technical field

The utility model relates to a kind of drive unit, particularly relates to a kind of gear-box of drive unit.

Background technique

Existing drive unit, as the drive unit of the window lifting system of automobile, be usually made up of motor and gear-box, described gear-box generally includes the driving mechanisms such as worm and gear.Actuation gear is socketed on a stationary axle of gear-box rotationally.The output shaft of motor is meshed with described gear unit, drives gear unit to rotate centered by stationary axle after electric motor starting, and then drives load operation.For ensureing the stable drive between gear unit and load, described axle center adopts the metal shaft that intensity is higher usually, to guarantee that axle center can not be out of shape, affects the stable of transmission.But on the one hand, the cost of material of metal shaft is high; On the other hand, metal shaft also needs certain machining after first one-step forming, to form smooth enough surface, reduces the friction with gear unit, therefore adopts metal shaft to make the holistic cost of gear-box raise to a certain extent.

Summary of the invention

In view of this, provide a kind of cost low and the gear-box of stable transmission and use the drive unit of this gear-box.

A kind of gear-box, comprises lower casing, is contained in the gear in lower casing and is covered on the lid of lower casing one end.Described lower casing comprises a back shaft, described back shaft supports described gear and rotates relative to lower casing, and described back shaft is hollow shape, and described gear-box also comprises a mandrel plugging in fitting in described back shaft, described mandrel is made up of metallic material, and described back shaft is made of plastics.

The utility model also provides a kind of drive unit with said gear case.

Compared to prior art, the back shaft of the utility model gear-box is made of plastics, and its cost is low holds concurrently, simply shaping.In addition, the mandrel that the utility model also adopts metallic material to make is inserted in back shaft, while effectively reducing costs, ensures the intensity of whole axle, maintains the stability of transmission.

Accompanying drawing explanation

Fig. 1 is the three-dimensional assembly diagram of the utility model first embodiment drive unit.

Fig. 2 is for drive unit described in Fig. 1 is along the sectional view of a plane, and wherein, the motor of drive unit is removed.

Fig. 3 is for drive unit described in Fig. 1 is along the sectional view of another plane.

The decomposed figure that Fig. 4 is drive unit shown in Fig. 1.

Fig. 5 is the schematic diagram of the mandrel of drive unit shown in Fig. 4.

Fig. 6 is the schematic diagram of the gear-box lower casing of the drive unit of the utility model second embodiment.

Fig. 7 is the bottom view of housing shown in Fig. 6.

Fig. 8 is the magnified partial view of Fig. 7 center VIII part.

Fig. 9 is the generalized section of housing shown in Fig. 7.

Embodiment

Below with reference to the drawings and the specific embodiments, the utility model is described in detail.

As Figure 1-3, the utility model drive unit gear-box 12 of comprising motor 10 and being connected with motor 10.The driving mechanism that described gear-box 12 comprises shell 14 and is contained in rotationally in shell 14.Described driving mechanism can be gear drive, Worm and worm-wheel gearing, pulley transmission mechanism or planetary gear transmission mechanism etc.In the present embodiment, driving mechanism comprises worm screw 15 and worm gear 16.Described motor 10 has the rotating shaft 18 of an output torque.Described worm screw 15 is fixed in described rotating shaft 18.Described rotating shaft 18 stretches to shell 14 together with worm screw 15 and is meshed with worm gear 16.

The end cap 22 that described shell 14 comprises lower casing 20 and is connected with lower casing 20.The tubular structure of described lower casing 20 in one end open.With direction shown in Fig. 2, described lower casing 20 open-topped, the opening end of lower casing 20 is closed by described end cap 22.The sidewall 23 that described lower casing 20 comprises diapire 21 and extends towards end cap 22 from the surrounding of diapire 21.The central authorities of described diapire 21 protrude towards end cap 22 vertically and are formed with back shaft 24.Described worm gear 16 is socketed on described back shaft 24, and relative support axle 24 rotates under the driving of worm screw 15.In the present embodiment, the top of described back shaft 24 extend out to outside shell 14 through end cap 22.Preferably, described back shaft 24 is made of plastics, and itself and lower casing 20 are integrally formed by the mode of molding and forming.Described back shaft 24 is in hollow shape, and its central authorities are formed with center hole 26, are provided with mandrel 28 in described center hole 26.Preferably, described mandrel 28 is made up of metallic material, the high hardness materials such as such as carbon steel, the back shaft 24 that its hardness is formed much larger than plastics.Described mandrel 28 plugging in fitting, in back shaft 24, strengthens the intensity of back shaft 24, effectively supports worm gear 16 and rotates.

In the present embodiment, the blind hole of described center hole 26 bottom end opening top closure, described mandrel 28, in elongated cylindric, is inserted in center hole 26 by the bottom end opening of center hole 26.Preferably, the diameter of described mandrel 28 substantially can equal or slightly larger than the aperture of center hole 26, because back shaft 24 is made of plastics, can produce certain distortion when inserting mandrel 28, after mandrel 28 inserts, form drive fit with back shaft 24, be connected to one.Because mandrel 28 is metal, the axle center 30 that therefore mandrel 28 and back shaft 24 are formed jointly has higher intensity, can bear enough large moment of torsion and indeformable.Preferably, the diameter of described mandrel 28 and the diameter of back shaft 24 are than being 0.1-0.75.

As shown in Figure 5, in the present embodiment, the outer surface of one end of described mandrel 28 is formed with annular knurl 29.In the present embodiment, described annular knurl 29 is press strip, and it is circumferentially spaced apart.In other embodiments, described annular knurl 29 can in the shape of a spiral, textured or other textures, described annular knurl 29 is when mandrel 28 is pressed into center hole 26, making to be formed with gap in part area between mandrel 28 and center hole 26 inwall, so the air trapping at center hole 26 top can be avoided to cause mandrel 28 to be pressed into precalculated position in mandrel 28 top when inserting mandrel 28.

Because the utility model adopts the plastic support axle 24 integrally formed with lower casing 20, after back shaft 24 molding and forming, smooth surface can be formed without the need to too much machining, support worm gear 16 and rotate.In addition, the utility model also adopts metal core axle 28 to be inserted in back shaft 24, effectively can strengthen the intensity of back shaft 24, be out of shape under preventing the torsional interaction be subject at worm gear 16.Whole axle assemble supporting of the present utility model shaping more simple, convenient, fast relative to traditional metal shaft.In addition, the material of back shaft 24 is plastics, and plastics are low relative to the cost of raw material of metal, therefore can reduce costs to a certain extent.Again in addition, the central authorities of back shaft 24 insert metal core axle 28, therefore, it is possible to ensure that whole axle assemble supporting has higher intensity, can not be out of shape when worm gear operates, and ensure the stability of transmission, and reduce the generation of noise.

Fig. 6 is to the lower casing 50 of gear-box of drive unit that Figure 9 shows that the second embodiment of the present utility model.Mandrel 51 in the present embodiment has smooth outer surface.Namely the annular knurl of the mandrel 51 in the first embodiment is eliminated.In order to avoid the air trapping at the top of center hole 56 when mandrel 51 is inserted in back shaft 54, the periphery of the center hole 56 of the present embodiment also offers a ventilating groove 57, and described ventilating groove 57 is connected with center hole 56, and centrally the bearing of trend in hole 56 extends.Preferably, the extended length of described ventilating groove 57 is substantially equal with the extended length of center hole 56.The width of the opening of described ventilating groove and described center hole joint and the diameter ratio of described center hole are 0.1-0.5.Ventilating groove 57 can be shaping when lower casing 50 molding and forming, convenient formation, and utilize this ventilating groove 57 to eliminate annular knurl on mandrel 51, thus save the processing technology of mandrel 51, reduces costs further, simplify manufacturing process.

It should be noted that, the utility model is not limited to above-mentioned mode of execution, and according to creative spirit of the present utility model, those skilled in the art can also make other changes, such as forms non-standard columniform center hole and replaces ventilating groove.Such as form the polygonal hole such as square opening, hexagonal hole; Or make center hole along the tapering that axially formation one is less of back shaft.These changes done according to creative spirit of the present utility model, all should be included within the utility model scope required for protection.

Claims (11)

1. a gear-box, comprises lower casing, is contained in the gear in lower casing and is covered on the lid of lower casing one end.Described lower casing comprises a back shaft, described back shaft supports described gear and rotates relative to lower casing, it is characterized in that: described back shaft is hollow shape, and described gear-box also comprises a mandrel plugging in fitting in described back shaft, described mandrel is made up of metallic material, and described back shaft is made of plastics.

2. gear-box as claimed in claim 1, it is characterized in that, described back shaft and described lower casing are integrally formed by the mode of molding and forming.

3. gear-box as claimed in claim 1, it is characterized in that, be formed with center hole in described back shaft, described mandrel tightly fits in the center hole of back shaft.

4. gear-box as claimed in claim 3, it is characterized in that, described center hole is that one end is closed, the blind hole of one end open.

5. gear-box as claimed in claim 3, it is characterized in that, described mandrel has at least between the inwall of partial outer face and described center hole and has gap.

6. gear-box as claimed in claim 5, it is characterized in that, described center hole is circular hole, and the outer surface of described mandrel forms annular knurl.

7. gear-box as claimed in claim 5, it is characterized in that, the periphery of described center hole has a ventilating groove, and described ventilating groove is connected with described center hole.

8. gear-box as claimed in claim 7, it is characterized in that, the width of the opening of described ventilating groove and described center hole joint and the diameter ratio of described center hole are 0.1-0.5..

9. gear-box as claimed in claim 1, it is characterized in that, described mandrel is formed from steel.

10. the gear-box as described in any one of claim 1-9, is characterized in that, the ratio of the diameter of described mandrel and the diameter of back shaft is 0.1-0.75.

11. 1 kinds of drive units, the gear-box comprising motor and be connected with motor, is characterized in that: described gear-box is the gear-box described in claim 1 to 10 any one.