CN215806234U

CN215806234U - Hub reduction gear and have its fork truck

Info

Publication number: CN215806234U
Application number: CN202121962149.XU
Authority: CN
Inventors: 王彬; 陆重霖; 肖军宝; 朱仕元; 吴姿宏
Original assignee: Suote Transmission Equipment Co Ltd
Current assignee: Suote Transmission Equipment Co Ltd
Priority date: 2021-08-19
Filing date: 2021-08-19
Publication date: 2022-02-11
Anticipated expiration: 2031-08-19

Abstract

The utility model provides a hub reduction gear and a forklift with the same, wherein the hub reduction gear comprises: the planetary reduction mechanism comprises an inner gear ring, a sun gear arranged on the inner side of the inner gear ring, a plurality of planet gears arranged between the inner gear ring and the sun gear, and a planet gear carrier connected with the planet gears, wherein the inner gear ring is suitable for being fixedly connected to a suspension of a vehicle, the axial end part of the sun gear is provided with a first connecting part, the axial end part of the planet gear carrier is provided with a second connecting part, and the first connecting part and the second connecting part are coaxially arranged and are respectively positioned on two sides of the planet gears; the end cover is arranged on one side of the inner gear ring, which faces the first connecting part, and is connected with the inner gear ring; and the wheel supporting shaft is arranged on one side of the inner gear ring, which faces the second connecting part, and is connected with the inner gear ring. The technical scheme of the utility model overcomes the defects of large occupied space and complex structure of the speed reducer of the large electric forklift in the prior art.

Description

Hub reduction gear and have its fork truck

Technical Field

The utility model relates to the technical field of engineering machinery, in particular to a hub reduction gear and a forklift with the hub reduction gear.

Background

The forklift is a common special vehicle in a factory, and is widely applied to the aspects of factory transportation, loading and carrying. With the implementation of new energy strategy, electric fork-lift truck develops fast. The use occasion of fork truck is sealed, and the establishment of charging station is more convenient, and the cost is controlled more easily. Meanwhile, the electric forklift can be matched with a large-capacity battery, the sensitivity to weight is low, and battery equipment with heavy weight and large energy can be carried. And compared with the traditional internal combustion engine forklift, the electric forklift has great advantages in the aspects of energy consumption, noise and stability.

At present, the small-sized forklift is higher in electromotion degree, but the electromotion proportion of the large-sized forklift needs to be improved. In terms of motorization of a large-sized forklift, a wheel-side reduction gear is basically still in an axle-type structure of an internal combustion engine, that is, the reduction gear is disposed between two suspensions, and input power is reduced in speed by the reduction gear and then transmitted to wheels on both sides by a steering mechanism. In the structure, the speed reducer is positioned in the middle of the chassis of the forklift, the occupied space is large, and meanwhile, the speed reducer needs to be provided with a reversing mechanism, so that the structure of the speed reducer is complex.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the utility model is to overcome the defects of large occupied space and complex structure of the speed reducer of the large electric forklift in the prior art, so that the wheel-side speed reducer and the forklift with the same are provided.

In order to solve the above problem, the present invention provides a hub reduction gear, comprising: the planetary reduction mechanism comprises an inner gear ring, a sun gear arranged on the inner side of the inner gear ring, a plurality of planet gears arranged between the inner gear ring and the sun gear, and a planet gear carrier connected with the planet gears, wherein the inner gear ring is suitable for being fixedly connected to a suspension of a vehicle, the axial end part of the sun gear is provided with a first connecting part, the axial end part of the planet gear carrier is provided with a second connecting part, and the first connecting part and the second connecting part are coaxially arranged and are respectively positioned on two sides of the planet gears; the end cover is arranged on one side of the inner gear ring, which faces the first connecting part, and is connected with the inner gear ring; the wheel supporting shaft is arranged on one side of the inner gear ring, which faces the second connecting portion, and is connected with the inner gear ring, the wheel supporting shaft is of a hollow shaft structure, and the inner space of the wheel supporting shaft is communicated with the second connecting portion.

Optionally, the sun gear includes a first shaft portion, and the first connection portion is a first connection hole formed on an end surface of the first shaft portion.

Optionally, the planet carrier comprises a second shaft portion, the second connecting portion is a second connecting hole formed on an end face of the second shaft portion, and the first connecting hole and the second connecting hole are coaxially arranged.

Optionally, a connection key is disposed on a hole wall of the first connection hole and/or the second connection hole.

Optionally, an avoiding hole is formed in the end cover, the first shaft portion penetrates through the avoiding hole, and a first bearing and/or a sealing structure is/are arranged between the avoiding hole and the first shaft portion.

Optionally, a second bearing is arranged between the avoiding hole and the planet carrier, the avoiding hole is a stepped hole, the first bearing is located in the small-diameter section of the avoiding hole, and the second bearing is located in the large-diameter section of the avoiding hole.

Optionally, an annular convex edge is arranged on the outer peripheral surface of the inner gear ring, and a third connecting part is arranged on the annular convex edge.

Optionally, the third connecting portion includes a plurality of third connecting holes, and the plurality of third connecting holes are arranged at intervals in the circumferential direction of the ring gear.

Optionally, the end cover and the inner gear ring, and the wheel support shaft and the inner gear ring are connected by fasteners.

The utility model also provides a forklift, which comprises a suspension and the wheel side speed reducing device arranged at the suspension, wherein the wheel side speed reducing device is the wheel side speed reducing device, and the inner gear ring is fixedly connected to the suspension.

The utility model has the following advantages:

by utilizing the technical scheme of the utility model, the hub reduction gear is fixedly connected to a suspension of a vehicle through the inner gear ring, power is input to the sun gear through the first connecting part, and the inner gear ring is fixedly arranged, so that when the sun gear rotates, the plurality of planet gears rotate around the inner gear ring and enable the planet gear carrier to rotate, and the power is output from the second connecting part and is transmitted to the wheels. In the structure, the wheel reduction gear can be directly installed on the suspension of the vehicle, so that the middle part of the chassis is not required to be arranged, the installation space is saved, meanwhile, the first connecting part and the second connecting part are coaxially arranged, namely, the input power and the output power are located on the same axis, and therefore the reversing mechanism is not required to be arranged, and the wheel reduction gear is simple in structure and low in cost. Therefore, the technical scheme of the utility model overcomes the defects of large occupied space and complex structure of the speed reducer of the large electric forklift in the prior art.

Drawings

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

FIG. 1 is a schematic diagram of the construction of the wheel reduction unit of the present invention;

FIG. 2 shows an enlarged schematic view at A in FIG. 1; and

fig. 3 shows an enlarged schematic view at B in fig. 1.

Description of reference numerals:

10. a planetary reduction mechanism; 11. an inner gear ring; 111. an annular flange; 12. a sun gear; 121. a first shaft portion; 13. a planet wheel; 14. a planet carrier; 141. a second shaft portion; 20. a first connection portion; 30. a second connecting portion; 40. an end cap; 41. avoiding holes; 50. a wheel support shaft; 60. a connecting bond; 70. a first bearing; 80. a sealing structure; 90. a second bearing; 100. a third connecting portion; 110. a fastener.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 and 2, a hub reduction gear of the present embodiment includes a planetary reduction mechanism 10, an end cover 40, and a wheel support shaft 50. The planetary reduction mechanism 10 includes an inner ring gear 11, a sun gear 12 disposed inside the inner ring gear 11, a plurality of planetary gears 13 disposed between the inner ring gear 11 and the sun gear 12, and a planetary carrier 14 connected to the plurality of planetary gears 13. The ring gear 11 is adapted to be fixedly connected to a suspension of a vehicle, and the sun gear 12 is provided at an axial end portion thereof with a first connecting portion 20 and the carrier 14 is provided at an axial end portion thereof with a second connecting portion 30. The first connecting portion 20 and the second connecting portion 30 are coaxially arranged and located on both sides of the planet wheel 13, respectively. The end cover 40 is disposed on a side of the ring gear 11 facing the first connecting portion 20 and connected to the ring gear 11. The wheel support shaft 50 is disposed on one side of the ring gear 11 facing the second connecting portion 30 and connected to the ring gear 11, the wheel support shaft 50 is of a hollow shaft structure, and an inner space of the wheel support shaft 50 is communicated with the second connecting portion 30.

By using the technical scheme of the embodiment, the hub reduction gear is fixedly connected to a suspension of a vehicle through the inner gear ring 11, power is input to the sun gear 12 through the first connecting portion 20, and as the inner gear ring 11 is fixedly arranged, when the sun gear 12 rotates, the plurality of planet gears 13 rotate around the inner gear ring 11 and enable the planet gear carrier 14 to rotate, and power is output from the second connecting portion 30 and is transmitted to the wheels. In the above structure, the wheel reduction gear can be directly mounted on the suspension of the vehicle, so that it is unnecessary to arrange in the middle of the chassis, thereby saving the mounting space, and meanwhile, the first connecting portion 20 and the second connecting portion 30 are coaxially arranged, that is, the input power and the output power are on the same axis, so that it is unnecessary to arrange a reversing mechanism, thereby making the wheel reduction gear simple in structure and low in cost. Therefore, the technical scheme of the embodiment overcomes the defects of large occupied space and complex structure of the speed reducer of the large electric forklift in the prior art.

As shown in fig. 2, in the present embodiment, the sun gear 12 includes a first shaft portion 121, and the first connection portion 20 is a first connection hole formed on an end surface of the first shaft portion 121. Specifically, the first shaft portion 121 is formed on the end surface of the sun gear 12 facing away from the wheel support shaft 50, and the first shaft portion 121 extends in a direction facing away from the wheel support shaft 50. The first shaft portion 121 is provided with a first connection hole on an end surface thereof, and the first connection hole is used for being connected with an external power input structure (a speed reducer or a motor), that is, the first connection hole serves as a power input end of the wheel reduction device.

As shown in fig. 1, in the present embodiment, the planetary carrier 14 includes a second shaft portion 141, and the second connecting portion 30 is a second connecting hole formed on an end surface of the second shaft portion 141, and the first connecting hole and the second connecting hole are coaxially arranged. Specifically, the second shaft portion 141 is formed on an end surface of the carrier 14 facing away from the end cover 40, and the second shaft portion 141 extends in a direction facing away from the end cover 40. The end surface of the second shaft portion 141 is provided with a second connection hole. The second connecting hole outputs power to the wheel hub through the middle transmission structure, namely the second connecting hole is used as a power output end of the wheel hub reduction gear.

Further, in the planetary reduction mechanism 10, power is input from the sun gear 12 and rotates the sun gear 12. Because the inner gear ring 11 is fixedly arranged, when the sun gear 12 rotates, the plurality of planet gears 13 rotate around the inner gear ring 11, and because the planet gear carrier 14 is connected with the plurality of planet gears 13, the plurality of planet gears 13 can drive the planet gear carrier 14 to rotate when rotating, so that power is output from the planet gear carrier 14.

Preferably, a needle bearing, a planet pin shaft, a wear pad and a retainer ring are further arranged in the planet speed reducing mechanism 10, and the four parts jointly form a positioning mechanism of the planet wheel, so that the stability of the planet wheel in the operation process is ensured. A certain gap is reserved between the wear-resistant pad and the needle roller bearing, and in the operation process, the wear-resistant pad can ensure the axial movement space of the needle roller and prevent the roller from being separated. The planet pin shaft adopts a cylindrical stepless structure, reduces the processing cost, and is respectively made into a step shape and a retainer ring groove for the hole in the holes at the two sides of the planet wheel carrier 14, thereby ensuring the axial positioning.

The planetary reduction mechanism is a reduction mechanism commonly used in the prior art, and therefore the specific reduction principle is not repeated in the application.

As shown in fig. 1 and 2, in the solution of the present embodiment, the hole walls of the first connection hole and the second connection hole are provided with connection keys 60. Specifically, the connection key 60 facilitates connection of the first connection aperture with the power input shaft, and the connection key 60 facilitates connection of the second connection aperture with the intermediate drive shaft.

As shown in fig. 2, in the solution of the present embodiment, an avoiding hole 41 is formed in the end cover 40, the first shaft portion 121 passes through the avoiding hole 41, and a first bearing 70 and a sealing structure 80 are disposed between the avoiding hole 41 and the first shaft portion 121. Specifically, the relief hole 41 is disposed at a central position of the end cover 40, the left end of the first shaft portion 121 passes through the relief hole 41, and the first bearing 70 is disposed between the first shaft portion 121 and the relief hole 41, so that the sun gear 12 can rotate smoothly, and the sun gear 12 is supported. The seal structure 80 is provided outside the first bearing 70, and preferably, the seal structure 80 is a skeleton oil seal that seals lubricating oil in the entire wheel-side reduction device.

As shown in fig. 2, in the technical solution of the present embodiment, a second bearing 90 is disposed between the avoiding hole 41 and the planet carrier 14, the avoiding hole 41 is a stepped hole, the first bearing 70 is located in a small-diameter section of the avoiding hole 41, and the second bearing 90 is located in a large-diameter section of the avoiding hole 41. Specifically, the second bearing 90 is located inside the first bearing 70, on one hand, to ensure smooth rotation of the carrier 14, and on the other hand, to serve as a main force-bearing point for rotation of the carrier 14.

Meanwhile, as can be seen from fig. 1, no bearing is provided on the right side of the planetary carrier 14, so that a flexible shaft cantilever structure is formed on the right side of the planetary carrier 14 (i.e., at the position of the second shaft portion 141), thereby preventing the planetary transmission from being unbalanced-loaded.

Preferably, the end cover is also provided with a round vernier and a steel ball type ventilation plug. Wherein, the circular vernier can be clear understand the oil level condition in the speed reducer, and the steel ball formula ventilation cap can guarantee that the inside oil gas oil pressure of speed reducer is balanced, prevents that the too big condition that appears the oil leak of internal pressure.

As shown in fig. 3, in the solution of the present embodiment, an annular flange 111 is provided on an outer peripheral surface of the ring gear 11, and the annular flange 111 is provided with a third connecting portion 100. The third connecting portion 100 includes a plurality of third connecting holes that are provided at intervals in the circumferential direction of the ring gear 11. Specifically, when the integrated ring gear 11 is mounted, the ring gear 11 is fixed to the suspension by bolting, and the ring gear 11 also plays a role in bearing gravity and torque.

As shown in fig. 1 and 3, in the solution of the present embodiment, the end cover 40 and the ring gear 11, and the wheel support shaft 50 and the ring gear 11 are connected by fasteners 110. Specifically, the wheel support shaft 50 is connected to the ring gear 11 by a socket head cap screw, a bearing is mounted on the outside of the wheel support shaft 50, and a wheel hub is mounted on the outside of the bearing. The end cover 40 is connected with the inner gear ring 11 through a hexagon socket head cap screw, and the inside of the end cover 40 is used as a bearing support and a stress component of an oil seal support.

Further, as can be seen from fig. 1, the wheel support shaft 50 is a hollow shaft structure having a flared portion at a left end thereof and connected to the ring gear 11, and a cantilever at a right end thereof. When the vehicle is mounted, the wheel is sleeved on the wheel support shaft 50. Preferably, the inner hole of the wheel supporting shaft 50 is coaxially arranged with the second connecting hole, and the second connecting hole is connected with the wheel hub through an intermediate transmission structure, so that power is transmitted to the wheel hub.

The embodiment also provides a forklift, which comprises a suspension and a wheel-side speed reducing device arranged at the suspension, wherein the wheel-side speed reducing device is the wheel-side speed reducing device, and the inner gear ring is fixedly connected to the suspension. Preferably, the forklift is an electric forklift, but other domestic, construction and on-site vehicles may also employ the above-described wheel reduction unit.

According to the above description, the present patent application has the following advantages:

1. the speed reducer with the new structure type is different from a traditional axle type speed changer and has the characteristics of simple structure, high reliability and high transmission efficiency;

2. the hub reduction gear has the characteristic of convenient disassembly, and can be disassembled quickly for maintenance, maintenance and repair.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims

1. A hub reduction unit, comprising:

the planetary reduction mechanism (10) comprises an inner gear ring (11), a sun gear (12) arranged on the inner side of the inner gear ring (11), a plurality of planet gears (13) arranged between the inner gear ring (11) and the sun gear (12), and a planet gear carrier (14) connected with the planet gears (13), wherein the inner gear ring (11) is suitable for being fixedly connected to a suspension of a vehicle, a first connecting part (20) is arranged at the axial end part of the sun gear (12), a second connecting part (30) is arranged at the axial end part of the planet gear carrier (14), and the first connecting part (20) and the second connecting part (30) are coaxially arranged and are respectively positioned on two sides of the planet gears (13);

the end cover (40) is arranged on one side, facing the first connecting part (20), of the inner gear ring (11) and is connected with the inner gear ring (11);

the wheel support shaft (50) is arranged on one side, facing the second connecting portion (30), of the inner gear ring (11) and connected with the inner gear ring (11), the wheel support shaft (50) is of a hollow shaft structure, and the inner space of the wheel support shaft (50) is communicated with the second connecting portion (30).

2. A hub reduction unit according to claim 1, characterized in that the sun gear (12) comprises a first shaft part (121), and the first connection part (20) is a first connection hole formed in an end face of the first shaft part (121).

3. A wheel hub reduction unit according to claim 2, characterized in that the carrier (14) comprises a second shaft portion (141), the second connection portion (30) being a second connection hole formed in an end face of the second shaft portion (141), the first connection hole and the second connection hole being arranged coaxially.

4. A hub reduction unit according to claim 3, wherein the wall of the first and/or second coupling hole is provided with a coupling key (60).

5. Wheel reduction unit according to claim 2, characterized in that an avoiding hole (41) is provided in the end cover (40), the first shaft part (121) passing through the avoiding hole (41), and a first bearing (70) and/or a sealing structure (80) is provided between the avoiding hole (41) and the first shaft part (121).

6. The hub reduction gear according to claim 5, wherein a second bearing (90) is disposed between the avoiding hole (41) and the carrier (14), the avoiding hole (41) is a stepped hole, the first bearing (70) is located in a small-diameter section of the avoiding hole (41), and the second bearing (90) is located in a large-diameter section of the avoiding hole (41).

7. A hub reduction unit according to claim 1, wherein the inner ring gear (11) is provided with an annular flange (111) on the outer peripheral surface thereof, and the annular flange (111) is provided with the third connecting portion (100).

8. A hub reduction unit according to claim 7, wherein the third connecting portion (100) comprises a plurality of third connecting holes arranged at intervals in the circumferential direction of the ring gear (11).

9. A hub reduction unit according to claim 1, wherein the connection between the end cap (40) and the inner ring gear (11), and between the wheel support shaft (50) and the inner ring gear (11) is by fasteners (110).

10. A forklift comprising a suspension and a wheel reduction unit arranged at the suspension, characterized in that the wheel reduction unit is the wheel reduction unit of any one of claims 1 to 9, the inner gear ring being fixedly connected to the suspension.