CN216382498U - Gear box - Google Patents

Abstract

The utility model relates to a gearbox comprising a housing (100) and a drive shaft (20) supported by bearings in bearing bores formed in said housing, the housing comprising an inner surface (50) defining the bearing bores, the inner surface (50) comprising a bearing mounting section (52) for mounting the bearings (30) and an extension section (54) extending inwardly from the bearing mounting section (52), the gearbox further comprising an oil baffle (60) comprising: a fixing portion (62) adapted to be fixed to the case; a seal portion (64) including a downward sealing surface (642) engaged and sealed to the extended section (54) of the inner surface (50); and a barrier (66) extending upwardly from the seal (64) toward the drive shaft (20) and opposite the bearing, wherein the barrier, the bearing, and the seal and/or the extended section (54) of the inner surface (50) define a temporary oil reservoir region (90) in fluid communication with the interior space.

Description

Gear box

Technical Field

The present application relates to a gearbox.

Background

At present, oil bath lubrication is mostly adopted for movable parts in the gear box. For the lubrication mode, in the process of low-speed operation or normal operation from rest of the gearbox, because the rotating speed is low, oil at the position of the bearing is insufficient, the lubrication of the bearing is poor, and the service life of the bearing is influenced. At present, for the speed reducer of low-speed operation, in order to improve bearing lubrication and guarantee that the lubricated oil mass is sufficient in the bearing operation process, the measure of adoption mainly has: raising the oil level inside the gearbox, lubrication by means of a centralized oil supply, forced lubrication of the gearbox alone, or the addition of an additional oil collecting structure.

Compared with the method of improving the oil level in the gear box, the oil baffle plate is additionally arranged, so that the oil quantity of the gear box during single oil replacement can be reduced. Also, in the case of partial sealing, it is not preferable to raise the level of the lubricating oil level. Adopt the form of centralized lubrication or force lubrication, can increase substantially assembly man-hour, and because the increase of assembly part, can increase the probability of failure of complete machine.

It is desirable to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

The main object of the present application is to provide a temporary oil reservoir for bearing lubrication so that the bearings can be sufficiently lubricated also during low speed operation of the gearbox or at the initial stage of start-up of the gearbox.

This object is achieved by a new gearbox construction. The gear box includes a box body defining an inner space and a drive shaft traversing the inner space in a longitudinal direction, the drive shaft being supported by bearings in bearing holes formed in the box body, wherein:

the housing includes an inner surface defining a lower half of the bearing bore, the inner surface including, in a longitudinal direction, a bearing mounting section for mounting the bearing and an extension section extending inwardly from the bearing mounting section and terminating in the interior space, and

the gear box includes the oil baffle, the oil baffle includes: a fixing portion adapted to be fixed to the case; a seal portion including a downward sealing surface engaged and sealed to the extended section of the inner surface; and a dam extending upwardly from the seal toward the driveshaft and opposite the bearing, wherein the dam, the bearing, and the seal and/or the extended section of the inner surface define a temporary oil reservoir region in fluid communication with the interior space.

In one embodiment, the dam has a top surface closest to the drive shaft, the top surface and the drive shaft defining a gap therebetween that fluidly communicates the temporary oil reservoir with the interior space.

In one embodiment, the top surface is a concave arcuate surface; and/or the downward sealing surface is an arcuate lower surface that is form-fit with the extended section of the inner surface.

In one embodiment, the downward sealing surface is sealingly joined to the extended section of the inner surface by an adhesive and/or an additional sealing member.

In one embodiment, the downward sealing surface is in sealing engagement with a portion of or the entire extension section of the inner surface in the longitudinal direction.

In one embodiment, the retainer is secured to the housing to apply a force to the oil deflector that compresses the downward sealing surface against the extended section of the inner surface.

In one embodiment, the oil deflector comprises a plate-like body, an annular protrusion protruding from the plate-like body providing the sealing portion, and a portion of the plate-like body extending from the annular protrusion towards the transmission shaft providing the blocking portion.

In one embodiment, the securing portion is provided by the sealing portion being secured and sealed to the extended section of the inner surface by means of fasteners and/or adhesive.

In one embodiment, the plate-like body further includes a downward extending portion extending downward from the annular protrusion, and the fixing portion protrudes from the downward extending portion.

In one embodiment, a fastener is threadedly engaged with a threaded hole formed on the fixing portion against the case to fasten the oil deflector to the case.

In one embodiment, the retainer portion includes a lug extending from the downwardly extending portion, the lug providing the threaded aperture; or

The fixing portion includes a lug protruding from the downward extending portion and a nut fixed to the lug, the lug being formed with a fastening hole aligned with a threaded hole of the nut.

In one embodiment, the interior space includes an upper receiving area for receiving the transmission component and a lower oil reservoir area located therebelow in fluid communication therewith and adapted to store lubricating oil, the lower oil reservoir area being larger in size than the interior space of the upper receiving area in the longitudinal direction so as to define a downward surface to which the fixing portion is secured.

In one embodiment, the gearbox comprises two or more drive shafts, each drive shaft being supported by two bearings in two bearing bores, each bearing bore being provided with one of the oil deflector plates.

The gearbox according to the present application comprises an oil deflector fastened to the casing, the oil deflector providing a seal sealed to an extension of the inner surface of the bearing bore of the casing and a barrier facing the bearing, whereby the barrier of the oil deflector, the bearing facing the barrier and the seal and/or the inner surface of the bearing bore of the oil deflector form a temporary oil reservoir for the bearing. By adopting the structure, the lubricating oil can be ensured to remain in the temporary oil storage area after the gear box is shut down, and the lubrication of the bearing during the next starting or low-speed running is ensured. The form of adding the oil baffle plate is adopted, the height of the lubricating oil level of the gear box is not required to be increased, so that the oil quantity for single replacement is not increased, and the method is friendly to customers. The oil baffle plate can adopt a welding part form, and has the advantages of simple structure, less time consumption in processing and assembling and low cost. The oil baffle plate is fixed in the gear box, the gear box does not need to move in the operation process, and the failure probability is extremely low. In addition, under the action of the pre-tightening force for fixing the oil baffle plate to the box body, the sealing part of the oil baffle plate is tightly sealed on the inner surface of the bearing hole in a matching manner, so that the sealing between the sealing part of the oil baffle plate and the inner surface of the bearing hole is ensured, and the lubricating oil in the temporary oil storage area does not flow back to the lower oil storage area of the gear box.

Drawings

The foregoing summary, as well as other features and advantages of the present application, will be readily apparent from the following detailed description of the exemplary embodiments, which is illustrated in the accompanying drawings. The drawings are not to scale and are intended for purposes of illustration and description only. Thus, features not shown in the drawings may be present in some embodiments thereof, and features shown in the drawings are not necessarily present in all embodiments. In the drawings:

FIG. 1 is a cross-sectional view of a gearbox constructed in accordance with the principles of the present invention;

FIG. 2 is an enlarged view of region A of FIG. 1;

FIG. 3 is an enlarged view of area B of FIG. 1;

FIG. 4 is a perspective view of an oil deflector of the gear box of the present application.

Detailed Description

The principles of the present invention are described in detail below with reference to the accompanying drawings.

Referring to fig. 1, the gearbox includes a case 100 defining an inner space. In general, the case 100 defines a longitudinal direction L and an up-down direction T that are perpendicular to each other, a lateral direction that extends perpendicular to the page of the drawings of the specification, and is perpendicular to both the longitudinal direction L and the up-down direction T. The gearbox is placed vertically in an up-down direction T during normal use, the terms "up-down direction", "up" and "down" all having the meaning commonly understood by a person skilled in the art. In this context, the directional terms "up-down direction T", "transverse direction" and "longitudinal direction L" are explained with reference to fig. 1.

The upper portion of the inner space of the case 100 is mainly used to accommodate various components constituting the gear box, and is referred to herein as a main accommodation space portion, which is simply referred to as an "upper accommodation region" 15; the lower portion of the interior space of the housing 100 is primarily intended to contain lubricating oil for lubricating the moving parts of the gearbox, optionally also containing some of the transmission components, referred to herein as the lower lubricating oil containing space portion, referred to simply as the "lower oil reservoir" 25. In fact, as shown, the upper receiving area 15 and the lower oil storage area 25 are in fluid communication with each other, forming an interior space of the tank 100.

As shown, the upper receiving area 15 mainly receives the driving shaft and the high-speed rotation member supported by the driving shaft. For example, a drive shaft 20 is shown by way of example extending through the upper receiving area 15, and the gear 12 is mounted on the drive shaft. Of course, as a gearbox for providing a motion and power transmission mechanism, it is generally understood by those skilled in the art to include not only one transmission shaft, for example, at least two transmission shafts supporting two gears engaged with each other, respectively, but also not only one gear, for example, at least two gears engaged with each other. For example, the illustrated gearbox may include two drive shafts spaced apart in a transverse direction, each supporting two gears (one of which is gear 12) that intermesh. For clarity and simplicity, the description herein will be set forth with respect to one driveshaft 20 illustrated, and the description of that driveshaft applies equally to the other driveshafts.

The tank 100 is typically a one-piece casting including a lower housing portion 250 defining the lower oil reservoir region 25 and an upper housing portion 150 defining the upper containment region 15. Since the upper housing portion 150 needs to support the weight of most of the transmission components of the gearbox and support the high speed rotation of the movable components, the wall thickness of the upper housing portion 150 may be greater than the wall thickness of the lower housing portion 250.

The interior spatial dimension of the lower oil reservoir region 25 is greater than the interior spatial dimension of the upper containment region 15 in the longitudinal direction L, such that the tank 100, and in particular the upper housing portion 150, defines a stepped downward surface 152, with the downward surface 152 facing the lower oil reservoir region 25 and partially defining the lower oil reservoir region 25.

A drive shaft 20 extends through the housing 100 in the longitudinal direction L and traverses the upper receiving area 15, and the example gear 12 is rotatably supported on the drive shaft 20. The drive shaft 20 is supported in first and second bearing holes 40 and 40 'formed on the upper housing part 150 of the case 100 through first and second bearings 30 and 30'. The inner surfaces 50 and 50 'of the upper housing portion 150 of the housing 100 define first and second bearing holes 40 and 40', respectively. The propeller shaft 20 has a central axis extending in the longitudinal direction L. The inner surfaces 50 and 50 'of the present application are specifically the lower half of the inner surfaces defining the first and second bearing holes 40 and 40' because the focus of the present application is on the structure located below the central axis.

The gearbox 100 includes oil dams 60 and 60 'mounted in each of the first and second bearing bores 40 and 40'. Description will be made below with respect to one of the bearing holes 40, the bearing 30 mounted in the bearing hole 40, and the oil deflector 60 with reference to enlarged views of regions a and B shown in fig. 2 and 3. It will be understood by those skilled in the art that the following description applies equally to the other bearing hole 40 'and the bearing 30' and the oil deflector 60 'installed in the bearing hole 40'.

As shown, the upper housing portion 150 defines the inner surface 50 and the downward facing surface 152 described above, and defines an inner end surface 154 that terminates in the upper receiving area 15, the inner end surface 154 connecting the inner surface 50 and the downward facing surface 152. In the longitudinal direction L, the inner surface 50 comprises a bearing mounting section 52 for mounting the bearing 30 and an extension section 54 extending from the bearing section 52 towards the upper receiving area 15 or inwards in the longitudinal direction L. Herein, "inwardly" refers to a direction towards the interior space of the gearbox and "outwardly" refers to a direction away from the interior space of the gearbox.

The oil deflector 60, which is secured to the tank 100, includes a securing portion 62 adapted to be secured to the tank 100, a sealing portion 64 adapted to engage and seal to the extended section 54 of the interior surface 50, and a blocking portion 66 for partially defining the temporary oil reservoir 90.

Referring to fig. 4, the oil deflector 60 comprises a plate-like body 72, the sealing portion 64 being provided by an annular protrusion 74 extending transversely, e.g. substantially perpendicularly, from the plate-like body 72, the sealing portion 64 in the form of the annular protrusion 74 having a lower sealing surface 642 configured for form-fitting and sealing to the extension section 54 of the inner surface 50, in particular the lower sealing surface 642 being a cylindrical surface portion closely and precisely fitting with the extension section 54 of the inner surface 50. The blocking portion 66 is a portion of the plate-like body 72 that extends from the annular projection 74 in an upward direction away from the lower sealing surface 642, and has a blocking surface 662, the blocking surface 662 facing in the direction of extension of the annular projection 74 and thus facing the bearing 30 when mounted on the bearing bore 40. Thus, as shown in fig. 3, the blocking surface 662 of the blocking portion 66, the other surface of the sealing portion 64 except for the lower sealing surface 642, the portion of the extended section 54 of the inner surface 50 not covered by the sealing portion 64 of the oil baffle 60, and the bearing 30 form the temporary oil reservoir region 90 of a substantially U-shaped cross-section. One skilled in the art can envision that the temporary oil reservoir area 90 is defined by the dam 66 and the seal 64 of the oil deflector 60 and the bearing 30 if the lower sealing surface 642 of the seal 64 completely covers the extended section 54 of the inner surface 50.

The stop 66 formed by a portion of the plate-like body 72 extends from the extension section 54 sealed to the inner surface 50 upwardly toward the drive shaft 20, but does not extend to the drive shaft 20. The stopper 66 defines an upper surface 664, and in a state where the oil deflector 60 is mounted in the case 100, a gap G exists between the upper surface 664 of the stopper 66 and the drive shaft 20, and the temporary oil reservoir region 90 is in fluid communication with the upper accommodation region 15, and thus the lower oil reservoir region 25, via the gap G. In the illustrated exemplary embodiment, the upper surface 664 of the stopper 66 is a circular arc-shaped surface complementary to the outer peripheral surface of the propeller shaft 20, but this is not essential as long as a suitably sized gap G can be provided.

With the illustrated construction, during operation of the gearbox, the drive shaft 20 and other moving parts of the gearbox rotate, and the lubricating oil in the lower oil reservoir region 25 is stirred up into the upper containment region 15, providing lubrication to the moving parts, such as the drive shaft 20, in the upper containment region 15. At the same time, the stirred or splashed lubrication flows outwardly in the longitudinal direction L through the gap G between the oil deflector 60 and the drive shaft 20 into the temporary oil reservoir 90, thereby lubricating the bearings 30, and then continues outwardly in the longitudinal direction L through the bearing gap back into the lower oil reservoir 25 through the lubrication passages or holes 101 (fig. 2) in the housing 100.

With this structure, even when the gearbox is stopped, the temporary oil storage area 90 stores a certain amount of lubricating oil so that the bearings 30 can be lubricated by the lubricating oil stored in the temporary oil storage area 90 at the next start-up of the gearbox or during the low-speed operation of the gearbox for an initial period of time after start-up, overcoming the technical problem of poor bearing lubrication in these situations.

The sealing between the lower sealing surface 642 of the sealing portion 64 of the oil deflector 60 and the extended section 54 of the inner surface 50 may be accomplished in any manner feasible in the art, such as applying an adhesive such as glue therebetween, for example, or additionally, providing an additional member such as a sealing ring or ring on the sealing surfaces of the two.

Advantageously, according to an exemplary embodiment of the present application, in addition to applying an adhesive between the lower sealing surface 642 and the inner surface 50, in order to enhance the sealing effect, the present application further presses the lower sealing surface 642 and the inner surface 50 together using a fastening force (or referred to as a pretightening force) that fixes or fastens the fixing portion 62 of the oil deflector 60 to the case 100.

Referring to fig. 3 and 4, in addition to the stop 66, the plate-like body 72 includes a downwardly extending portion 68 that extends downwardly from the annular projection 74 and extends beyond or across the inner end surface 154 of the upper housing portion 150. The retainer 62 includes a lug 76 extending generally perpendicularly from the downwardly extending portion 68 of the plate-like body 72, and a nut 78 secured or attached to the lug 76. The lugs 76 are formed with fastening holes 80 aligned with threaded holes in the nut 78. The housing 100 includes an optical aperture 82 extending from the downward surface 152 to the interior of the upper housing portion 150. Fasteners 84 extend through threaded holes in the nut 78 and fastening holes 80 in the lugs 76 into blind holes 82 in the case 100. During tightening of the distal end of the fastener 84 against the closed end of the blind bore 82, the threaded engagement of the fastener 84 with the threaded bores of the lug 76 and nut 78 secured together causes the lug 76 and nut 78, and thus the oil deflector 60 as a whole, to move downwardly such that the lower sealing surface 642 of the seal portion 64 of the oil deflector 60 is pressed more tightly against the inner surface 50, enhancing the seal therebetween.

As an alternative to the above-described structure, since the nut 78 is fixed, e.g., welded, to the lug 76, in the case where the nut 78 has a threaded hole, the fastening hole 80 in the lug 78 may not be provided with a thread. In addition, the blind hole 82 in the form of a smooth bore is not required and the fastener 84 can be tightened against the downward facing surface 152 of the housing 100 with the same technical result.

As a further alternative, the fixing portion 62 of the oil deflector 60 may be provided without the nut 78 in the case where the thickness of the lug 76 is sufficient.

The illustrated embodiment shows two separate retainer portions 62 for each oil deflector 60, it being understood that the number and specific configuration of the retainer portions 62 may be modified as appropriate.

In an embodiment not shown in the drawings, the sealing portion 64 may also serve as a fixing portion 62 for fixing the oil deflector 60 to the casing 100, and a fastening force pressing against the inner surface 50 may be applied to the sealing portion 64 in the form of a fastener while ensuring a sealing effect between the sealing portion 64 and the extended portion 54 of the inner surface 50. In this case, the downward extension 68 of the oil deflector 60 may be omitted. Of course, the present application is not exhaustive of the structure for fastening the oil deflector 60 to the housing 100 and the structure for pressing the sealing portion against the bearing hole, and all structures capable of performing these functions are within the scope of the present application.

According to the principle of this application, oil baffle 60 can be formed by each part welding, simple structure, convenient operation, assembly and processing cost are all lower. The oil baffle plate with the structure meets the requirement of increasing the oil level of lubricating oil in the gear box, and is user-friendly.

As mentioned above, the present application describes the principles of the present application based on illustrated exemplary embodiments, but the scope of protection of the present application is in no way limited to the details shown and described. Rather, various modifications or variations may be made without departing from the spirit or scope defined in the appended claims.

Claims (13)

1. A gearbox comprising a casing (100) defining an inner space and a drive shaft (20) traversing said inner space in a longitudinal direction (L), said drive shaft being bearing-supported in bearing holes formed in said casing, characterized in that:

the housing includes an inner surface (50) defining a lower half of the bearing bore, the inner surface (50) including, in a longitudinal direction, a bearing mounting section (52) for mounting the bearing (30) and an extension section (54) extending inwardly from the bearing mounting section (52) and terminating in the interior space, and

the gearbox includes oil baffle (60), the oil baffle includes: a fixing portion (62) adapted to be fixed to the case; a seal portion (64) including a downward sealing surface (642) engaged and sealed to the extended section (54) of the inner surface (50); and a barrier (66) extending upwardly from the seal (64) toward the drive shaft (20) and opposite the bearing, wherein the barrier, the bearing, and the seal and/or the extended section (54) of the inner surface (50) define a temporary oil reservoir region (90) in fluid communication with the interior space.

2. The gearbox of claim 1, wherein the stop (66) has a top surface (664) nearest the drive shaft (20), the top surface (664) and the drive shaft (20) defining a gap (G) therebetween that fluidly communicates the temporary oil reservoir (90) with the interior space.

3. The gearbox according to claim 2, characterized in that the top surface (664) is a concave arc surface; and/or the downward sealing surface (642) is an arcuate lower surface that is form-fit with the extended section (54) of the inner surface (50).

4. Gearbox according to claim 1, characterised in that the downward sealing surface (642) is sealingly joined to the extended section (54) of the inner surface (50) by means of an adhesive and/or an additional sealing member.

5. Gearbox according to claim 1, characterised in that in the longitudinal direction the downward sealing surface (642) is in sealing engagement with a part of the extension section (54) or the entire extension section (54) of the inner surface (50).

6. Gearbox according to any of the preceding claims 1-5, characterised in that the fixing part (62) is fastened to the casing (100) to apply a force to the oil deflector (60) pressing the downward sealing surface (642) against the extended section (54) of the inner surface (50).

7. Gearbox according to claim 6, characterised in that the oil deflector (60) comprises a plate-like body (72), an annular projection (74) protruding from the plate-like body (72) providing the sealing portion (64), the portion of the plate-like body (72) extending from the annular projection (74) towards the transmission shaft (20) providing the blocking portion (66).

8. Gearbox according to claim 7, characterised in that the fixing portion (62) is provided by the sealing portion (64), the sealing portion (64) being fixed and sealed to the extension section (54) of the inner surface (50) by means of fasteners and/or adhesive.

9. The gearbox according to claim 7, characterized in that the plate-like body (72) further comprises a downwardly extending portion (68) extending downwardly from the annular projection (74), the fixing portion (62) projecting from the downwardly extending portion (68).

10. The gearbox as set forth in claim 9, characterized in that a fastener (84) is threadedly engaged with a threaded hole formed on the fixing portion (62) against the case (100) to fasten an oil deflector (60) to the case (100).

11. A gearbox according to claim 10,

the fixing portion (62) including a lug (76) projecting from the downwardly extending portion (68), the lug (76) providing the threaded aperture; or

The fixing portion (62) includes a lug (76) protruding from the downward extending portion (68) and a nut (78) fixed to the lug (76), the lug (76) being formed with a fastening hole (80) aligned with a threaded hole of the nut (78).

12. Gearbox according to any of claims 9-11, characterised in that the inner space comprises an upper receiving area (15) for receiving a transmission component and a lower oil reservoir area (25) below it in fluid communication therewith and adapted to storing lubricating oil, which lower oil reservoir area is dimensioned larger than the inner space of the upper receiving area in the longitudinal direction, thereby defining a downward surface (152), the fixing portion (62) being fastened to the downward surface (152).

13. A gearbox according to any of claims 1-5, characterised in that the gearbox comprises two or more drive shafts, each drive shaft being supported by two bearings in two bearing holes, each bearing hole being provided with one of said oil deflector plates.

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