CN211117489U - Gear box and mobile robot with same - Google Patents

Abstract

The utility model provides a gear box, this gear box includes first casing and second casing, first casing and second casing detachable equipment are in order to form one and hold the chamber, should hold the intracavity and be provided with the gear train, get rid of lubricating grease to the gear box lateral wall during the gear train operation, wherein be provided with the baffle on the second casing, this baffle becomes the determining deviation setting with the lateral wall and forms a long and narrow gap, lubricating grease need just can reach concatenation department through this gap, and lubricating grease hinders spilling over of lubricating grease when adhering to the gap, thereby the function of anti-overflow has been realized through simple structure. The utility model also provides a mobile robot who has this gear box.

Description

Gear box and mobile robot with same

Technical Field

The utility model relates to a mobile robot technical field especially relates to a gear box and have this gear box mobile robot.

Background

An existing mobile robot (such as a sweeper) is generally provided with a gear box, gears which are meshed with each other are arranged in the gear box to transmit, lubricating grease needs to be injected into the gear box to ensure smooth rotation between the gears, and after the mobile robot works for a period of time, the lubricating grease can flow out along the gap of the gear box. On one hand, the friction among the gears can be increased, and the service life is influenced; on the other hand, the discharged grease is easily adhered to hands and the ground.

Patent document CN203009794U provides a gear box structure, in which a gap between a front cover and a middle seat of the gear box is completely sealed by installing a sealing member between the front cover and the middle seat, so as to effectively prevent lubricating oil from flowing out of the gear box, but this structure needs to add a sealing ring, which increases the manufacturing cost.

Patent document CN201448429U also provides a gear box structure, in which a cavity is designed on the gear box for accommodating leaked lubricant oil, so as to prevent the leakage of the lubricant oil from the whole gear box, but this structure increases the volume of the gear box, so that the whole gear box is bulky.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a gear box structure and a mobile robot using the same to prevent leakage of lubricating grease at low cost and with a simple structure.

In a first aspect, the present invention provides a gear box, including: a first shell and a second shell, wherein the first shell and the second shell are arranged in the shell,

the first shell is provided with a first splicing surface;

the second shell is provided with a second splicing surface, the first splicing surface and the second splicing surface are spliced to form a containing cavity, and a long and narrow gap is formed between the containing cavity and the splicing position.

In one embodiment, the first housing includes a first base and a circular sidewall extending from the first base, and a top of the sidewall forms a first splicing surface;

the second shell is provided with a second substrate, the second substrate is provided with the second splicing surface, the second substrate is provided with an annular baffle protruding into the accommodating cavity, the baffle is arranged at a certain distance from the side wall, and a gap between the baffle and the side wall forms the long and narrow gap.

In one embodiment, the first base is formed with an annular groove on an inner side of the sidewall, and the baffle extends into the annular groove.

In one embodiment, the first base is provided with an annular protrusion protruding from the sidewall, and the protrusion and the sidewall form the annular groove.

In one embodiment, the first base is recessed downwardly adjacent the sidewall to form the annular recess.

In one embodiment, a seal ring is disposed in the annular groove, and the end of the baffle abuts against the seal ring.

In one embodiment, the baffle is disposed parallel to the side wall to form a gap of uniform width.

In a second aspect, the present invention further provides a mobile robot, which includes the above-mentioned gear box, and a driving wheel driven by the above-mentioned gear box.

The utility model discloses a prevent that lubricating grease from revealing from the gap of first casing and second casing concatenation, form the long and narrow gap of one end in appearance chamber and concatenation department, because the grease has certain viscosity, can make the grease block spilling over of grease in the gap attached to. Therefore the utility model discloses can realize preventing the effect that lubricating grease revealed under the whole volume of increase gear box and the condition of cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is an assembly view of a gear case according to an embodiment of the present invention;

fig. 2 is an exploded view of a gear box according to an embodiment of the present invention;

fig. 3 is a view of the first housing in an embodiment of the present invention;

fig. 4 is a view of a second housing in an embodiment of the invention;

fig. 5 is a sectional view of a gear box according to an embodiment of the present invention;

fig. 6 is a sectional view of a gear box according to an embodiment of the present invention;

fig. 7 is an enlarged view of fig. 5 a in the present invention;

FIG. 8 is a cross-sectional view of a gear box according to another embodiment of the present invention;

fig. 9 is a sectional view of a gear box according to another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise

Referring to fig. 1 to 7, a gearbox 100 according to a first embodiment of the present invention is shown, and a motor 200 is disposed outside the gearbox 100. Referring to fig. 2, 3 and 4, the gearbox 100 includes: the first casing 110 has a first base 111, an edge of the first base 111 extends to form an annular sidewall 112, a top surface of the annular sidewall 112 is formed with a first splicing surface 113, the sidewall 112 and the first base 111 enclose to form a cavity 130 having an opening, in this embodiment, the first splicing surface 113 is disposed in a horizontal plane, and in other embodiments, the first splicing surface 113 may be an inclined plane or an arc surface. The second housing 120 has a second substrate 121, the second substrate 121 forms a second splicing surface 122, and when the first housing 110 and the second housing 120 are spliced together, the first splicing surface 113 and the second splicing surface 122 are in close splicing contact with each other, so that the cavity 130 forms a closed cavity. The first housing 110 and the second housing 120 are detachably connected, in this embodiment, a plurality of threaded holes 118 are formed in the first housing 110, a plurality of stepped holes 124 are formed in the second housing 120 matching with the threaded holes 118, and screws (not shown) pass through the stepped holes 124 and are screwed in the threaded holes 118 to splice the first housing 110 and the second housing 120. In other embodiments, an annular sidewall may be disposed on the second substrate 121, and a second splicing surface 121 is disposed on the top of the sidewall, and this structure is essentially equivalent to the embodiment.

Further, referring to fig. 4 and 5, an annular baffle 123 is further protrudingly disposed on the second substrate 121, the baffle 123 extends into the cavity 130 and extends toward the first substrate 111, and the second splicing surface 122 is located outside the baffle 123, so that a splicing position formed by the first splicing surface 113 and the second splicing surface 122 is located outside the baffle 123. The baffle 123 is spaced apart from the sidewall 112 such that a gap between the baffle and the sidewall forms a slit 140, and the grease in the cavity 130 can reach the joint through the slit 140. Since the grease has a certain viscosity, the grease is attached to the gap 140 to prevent the grease from overflowing from the joint. In principle, the smaller the width of the gap 140, the better the grease overflow prevention effect, but the width of the gap 140 cannot be made to be extremely small. In the present embodiment, the first housing 110 and the second housing 120 are both injection molded, and need to consider the manufacturing tolerance and the material shrinkage rate of the two, and simultaneously need to ensure that the two are in clearance fit when being assembled, and the larger the manufacturing tolerance and the product shrinkage rate are, the larger the design of the width dimension of the gap 140 is; 2. the injection molding is designed with draft, in this embodiment, the baffle 123 is designed with draft of 1 °, and the longer the baffle 123 is, the larger the width dimension of the gap 140 is designed to avoid interference. In addition, in the present embodiment, only the side wall 112 is disposed on the first housing 110 and is spliced with the second housing 120, so that the spliced position is as far away from the first base 111 of the first housing 110 as possible, and thus the gap 140 can be the longest under the condition of the same size of the gear box 100, thereby improving the sealing performance of the gear box 100.

Further, referring to fig. 1, 2 and 5, a gear set 150 is further disposed in the cavity 130. Gear set 150 includes a worm 151 drivingly connected to motor 200; a worm wheel 152 engaged with the worm 151, the worm wheel 152 being provided with an input gear 153 coaxially therewith; a reduction gear 154 meshed with the input gear 153; the reduction gear 154 is engaged with an output gear 155, and the output gear 155 is provided with a driving shaft 156, and the driving shaft 156 is in transmission connection with driving members, such as driving wheels, edge brushes, rolling brushes and the like. The first housing 110 is further provided with an input hole 116 and an output hole 117, the motor 200 is in transmission connection with the turbine 151 through the input hole 116, the output hole 117 is a stepped hole and is internally provided with a bearing 157, and the driving shaft 156 penetrates through the bearing 157 and extends out of the gear box 100 through the output hole 117. The gears of the gear set 150 rotate substantially along the rotation axis 158 parallel to the side walls 112, and in order to ensure smooth transmission connection of the gear set 150, grease is applied to the gear set 150, and the grease attached to the gear set 150 is thrown toward the side walls 112 by centrifugal force. In the present embodiment, the baffle 123 is closer to the gearbox 100 than the side wall 112, the baffle 123 is disposed substantially parallel to the side wall 112 and substantially perpendicular to the moving direction of the splashed grease, the splashed grease is first resisted by the baffle 123, and the baffle 123 decelerates the grease. While the gap 140 formed by the baffle 123 and the side wall 112 is substantially perpendicular to the splashing direction of the grease, the possibility of the grease overflowing along the gap 140 by the centrifugal force is greatly reduced.

Further, referring to fig. 5, an annular protrusion 114 is further extended from the first base 111, the protrusion 114 is disposed inside the sidewall 112, and the sidewall 112 is disposed at a gap, such that the protrusion 114 and the sidewall 112 form an annular groove 115, although the protrusion 114 does not necessarily form a complete ring shape, and in some positions, it is necessary to perform a breaking timing for avoiding the gear set 150, which can still be considered as an equivalent solution of the present invention. The baffle 123 is extended into the groove 115, the groove 115 forms a certain receiving space, the groove 115 can store the grease so that the grease can be retained therein, and the anti-overflow effect is further improved.

Further, please refer to fig. 6, a sealing ring 160 made of an elastic material is further disposed in the groove 115, and when the baffle 123 extends into the groove 115, the baffle abuts against the sealing ring 160 to generate elastic deformation, so as to block the passage between the cavity 130 and the gap 140, and form a dual-safety function of preventing grease from overflowing with the gap 140.

Referring to fig. 8 and 9, a second embodiment of the present invention is mainly different from the first embodiment in that an annular groove 115 is formed. In this embodiment, the first substrate 111 is recessed to form an annular groove 115' near the inner side of the sidewall. The annular recess 115 'is formed by removing material, since no clearance design for the gear housing 150 is required, an annular design can be used, and the baffle 123 extends into the annular recess 115'. Further, a sealing ring 160 is further disposed in the annular groove 115 ', and when the baffle 123 extends into the groove 115', the baffle abuts against the sealing ring 160 to generate elastic deformation, so as to block a passage between the cavity 130 and the gap 140, and form a grease anti-overflow double-safety function with the gap 140.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.

Claims (8)

1. A gearbox, comprising: a first shell and a second shell, wherein the first shell and the second shell are arranged in the shell,

the first shell is provided with a first splicing surface;

the second shell is provided with a second splicing surface, the first splicing surface and the second splicing surface are spliced to form a containing cavity, and a section of long and narrow gap is formed between the containing cavity and the splicing position.

2. A gearbox according to claim 1,

the first shell comprises a first substrate and an annular side wall extending from the first substrate, and the top of the side wall forms a first splicing surface;

the second shell is provided with a second substrate, the second splicing surface is formed on the second substrate, an annular baffle is arranged in the second substrate in a protruding mode towards the cavity, the baffle and the side wall are arranged at a certain interval, and a gap between the baffle and the side wall forms the long and narrow gap.

3. The gearbox of claim 2, wherein the first base is formed with an annular recess on an inner side of the side wall, the baffle extending into the annular recess.

4. The gearbox of claim 3, wherein the first base is provided with an annular projection projecting relative to the sidewall, the annular projection and the sidewall forming the annular recess.

5. The gearbox of claim 3, wherein the first base is recessed downwardly adjacent the sidewall to form the annular groove.

6. A gearbox according to any one of claims 3 to 5, characterised in that a sealing ring is provided in said annular recess, said baffle end abutting against said sealing ring.

7. The gearbox of claim 2, wherein the baffle is disposed parallel to the sidewall.

8. A mobile robot further comprising a gear box according to claims 1 to 7, and a drive wheel driven by the gear box.

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