Sealing and lubricating structure of speed reducer of electric forklift
By using oil-lubricated tapered roller bearings and sealing structures in electric forklift reducers, the problems of muddy water intrusion and lubricating oil leakage are solved, and reliable sealing and convenient maintenance are achieved in outdoor environments.
Patent Information
- Application Number
- CN202422118962.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-08-30
AI Technical Summary
The existing electric forklift reducer structure is easily invaded by mud and water, which leads to corrosion and premature failure of gears and bearings, and the grease lubrication maintenance cost is high.
Oil-lubricated tapered roller bearings are used, and sealants, cassette oil seals, skeleton oil seals and O-rings are set between the axle and the reducer housing to form a reliable sealing performance to prevent the intrusion of external mud and water and the leakage of internal lubricating oil.
It can prevent mud and water intrusion and lubricating oil leakage in outdoor environments, reduce production costs, simplify maintenance processes, and improve production convenience and economy.
Smart Images
Figure CN223411440U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of speed reducers, in particular to a sealing and lubricating structure of a speed reducer for an electric forklift. Background Art
[0002] Electric forklifts are usually used for indoor operations due to their zero emissions and low noise. Since there are generally no impurities such as mud, water, sand and gravel in the indoor working environment, the transmission device design usually does not consider making a mud and water-proof sealing structure between the axle and the reducer housing, in order to save development and manufacturing costs and increase the market competitiveness of the product.
[0003] The reducer design for current dual-drive electric forklifts generally involves the axle transmitting power to the wheels to propel the vehicle. Because the axle is a rotating component, there's a certain clearance between it and the relatively stationary reducer housing, allowing mud and water to easily enter the reducer through this clearance. The axle is typically equipped with two tapered roller bearings for load bearing and positioning, and these bearings are typically lubricated with grease. After-sales grease replacement requires disassembly of the reducer, resulting in relatively high maintenance costs. If this reducer structure is used outdoors in the future, there's a risk of mud, water, sand, and gravel intruding into the reducer, potentially causing corrosion and premature failure of the gears and bearings within the reducer. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide a sealing and lubricating structure for an electric forklift reducer, which can not only prevent the invasion of external mud and water, but also prevent the leakage of gear oil inside the reducer. In view of the excellent and reliable sealing performance of this structure, the tapered roller bearings on the wheel axle adopt oil lubrication, and the lubrication and cooling effect is better than grease lubrication, making production, assembly and maintenance more convenient and economical.
[0005] To achieve the above objectives, the present invention provides the following technical solutions:
[0006] A sealing and lubrication structure for an electric forklift reducer includes a wheel axle, a reducer housing, and a planetary carrier. A left tapered roller bearing and a right tapered roller bearing are installed between the wheel axle and the reducer housing. The wheel axle and the planetary carrier are fastened by a locking nut. The right end of the planetary carrier cooperates with the gear transmission system in the reducer housing to transmit power, and the right end of the reducer housing is completely sealed by sealant. An oil seal mounting hole is provided on the flange surface of the wheel axle, and a cartridge oil seal is press-fitted between the oil seal mounting hole of the wheel axle and the reducer housing, and the cartridge oil seal is tightly against the reducer housing.
[0007] As a further improvement of this solution, a skeleton oil seal is pressed between the oil seal mounting hole of the wheel axle and the reducer housing, a bushing is provided between the skeleton oil seal and the reducer housing, the bushing is pressed onto the reducer housing through an interference fit, and the skeleton oil seal is installed between the oil seal mounting hole of the wheel axle and the bushing; a fitting clearance is provided between the bushing and the oil seal mounting hole.
[0008] As a further improvement of this solution, a second O-ring is additionally provided between the chamfer of the bushing and the reducer housing.
[0009] As a further improvement of this solution, the wheel shaft and the planet carrier are sealed by an O-ring.
[0010] Compared with the existing technology, the present invention has the following beneficial effects: the sealing and lubricating structure of the electric forklift reducer of the present invention ensures reliable sealing performance between the wheel axle and the reducer housing through structural design, which can not only prevent the intrusion of external mud and water, but also prevent the leakage of lubricating oil of the gears inside the reducer, making the reducer structure suitable for outdoor working environments. At the same time, the tapered roller bearings on the wheel axle are oil-lubricated, which eliminates the greasing process during the production and assembly process compared to grease lubrication, increasing production convenience while reducing production costs. In terms of after-sales maintenance, there is no need to disassemble the reducer, and maintenance can be completed by simply replacing the gear oil in the reducer, which is more convenient and economical than grease lubrication. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] The present invention will be further described below with reference to the accompanying drawings.
[0012] Attachment Figure 1 This is a structural diagram of the sealing and lubricating structure of the forklift reducer of the utility model;
[0013] Attachment Figure 2 This is a schematic diagram of the internal structure of a second implementation form of the sealing and lubricating structure of a forklift reducer of the utility model;
[0014] Attachment Figure 3 This is a schematic diagram of the internal structure of a third implementation form of the sealing and lubricating structure of a forklift reducer of the utility model.
[0015] Markings in the figure: 1. axle; 2. reducer housing; 3. left tapered roller bearing; 4. right tapered roller bearing; 5. planetary carrier; 6. O-ring 1; 7. locking nut; 8. cassette oil seal; 81. skeleton oil seal; 9. bushing; 10. O-ring 2. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0017] Example 1
[0018] like Figure 1 As shown, this embodiment provides a sealed lubrication structure for an electric forklift reducer, comprising an axle 1, a reducer housing 2, and a planetary carrier 5. An O-ring 6 seals the axle 1 and the planetary carrier 5 to prevent gear oil from leaking from the inner bore of the axle to the outside of the reducer. A left tapered roller bearing 3 and a right tapered roller bearing 4 are installed between the axle 1 and the reducer housing 2. The axle 1 and the planetary carrier 5 are fastened together by a locking nut 7. The right end of the planetary carrier 5 cooperates with the gear transmission system within the reducer housing 2 to transmit power, and the right end of the reducer housing 2 is completely sealed with sealant. An oil seal mounting hole is provided on the flange surface of the axle 1. A cartridge oil seal 8 is press-fitted between the oil seal mounting hole of the axle 1 and the reducer housing 2, and the cartridge oil seal 8 is tightly seated against the reducer housing 2.
[0019] An oil seal mounting hole is designed on the flange surface of axle 1. A cassette oil seal 8 is press-fitted between the axle's oil seal mounting hole and reducer housing 2, resting firmly against the latter. This ensures a seamless axial gap between the two, preventing the accumulation of foreign matter that could affect sealing performance and product appearance. This cassette oil seal 8 is suitable for dynamic sealing. During normal operation of the reducer, it rotates synchronously with axle 1. It also provides reliable sealing performance, effectively preventing the intrusion of muddy water and the leakage of internal gear oil.
[0020] Based on this structural design, the left tapered roller bearing 3 and the right tapered roller bearing 4 are lubricated by the gear lubricating oil inside the reducer, thereby forming a completely sealed oil-lubricated reducer structure.
[0021] The structural design ensures reliable sealing performance between the axle and the reducer housing, which can prevent the invasion of external mud and water, and prevent the leakage of lubricating oil of the internal gears of the reducer, making the reducer structure suitable for outdoor working environment.
[0022] Example 2
[0023] like Figure 2As shown, the structures of this embodiment and embodiment 1 are basically the same, the difference is that this embodiment further optimizes the structure based on embodiment 1. Specifically, a skeleton oil seal 81 is pressed between the oil seal mounting hole of the wheel axle 1 and the reducer housing 2, and a bushing 9 is provided between the skeleton oil seal 81 and the reducer housing 2. The bushing 9 is pressed onto the reducer housing 2 through an interference fit, and the skeleton oil seal 81 is installed between the oil seal mounting hole of the wheel axle 1 and the bushing 9; a fitting clearance is provided between the bushing 9 and the oil seal mounting hole.
[0024] A smaller clearance is designed between the bushing 9 and the oil seal mounting hole to prevent dust. At the same time, the bushing 9 and the reducer housing 2 form a reliable static seal between the mounting surfaces through interference fit. The skeleton oil seal 81 and the bushing 9 together ensure the reliable sealing performance between the axle 1 and the housing, preventing the intrusion of external mud and water and the leakage of internal gear oil. The tapered roller bearings on the axle are still lubricated with oil. Compared with grease lubrication, the tapered roller bearings on the axle are lubricated with oil. Compared with grease lubrication, the grease application process in the production and assembly process is eliminated, which increases production convenience and reduces production costs. In terms of after-sales maintenance, there is no need to disassemble the reducer. The gear oil in the reducer can be directly replaced to complete the maintenance. Compared with grease lubrication, it is more convenient and economical.
[0025] Example 3
[0026] like Figure 3 As shown, the structures of this embodiment and embodiment 2 are basically the same, with the difference being that this embodiment further optimizes the structure of embodiment 2. Specifically, an O-ring 10 is provided between the chamfer of the bushing 9 and the reducer housing 2 to ensure tightness between the bushing and the housing. A skeleton oil seal 81 is installed between the oil seal mounting hole of the axle 1 and the bushing. A small clearance is designed between the bushing 9 and the oil seal mounting hole to prevent dust. The skeleton oil seal 81 and the O-ring 10 together ensure reliable sealing between the axle and the reducer housing, preventing the intrusion of external mud and water and the leakage of internal gear oil. The tapered roller bearing on the axle still uses oil lubrication.
[0027] The above content is merely an example of the structure of the present invention. Technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.
Claims
1. A sealing and lubricating structure of an electric forklift reducer, comprising a wheel axle (1), a reducer housing (2) and a planetary carrier (5), characterized in that: A left tapered roller bearing (3) and a right tapered roller bearing (4) are installed between the wheel axle (1) and the reducer housing (2). The wheel axle (1) and the planetary carrier (5) are fastened by a locking nut (7). The right end of the planetary carrier (5) cooperates with the gear transmission system in the reducer housing (2) to transmit power, and the right end of the reducer housing (2) is completely sealed by a sealant. An oil seal mounting hole is provided on the flange surface of the wheel axle (1). A cassette oil seal (8) is press-fitted between the oil seal mounting hole of the wheel axle (1) and the reducer housing (2). The cassette oil seal (8) is closely attached to the reducer housing (2).
2. The sealing and lubricating structure of an electric forklift reducer according to claim 1, characterized in that: A skeleton oil seal (81) is press-fitted between the oil seal mounting hole of the wheel axle (1) and the reducer housing (2); a bushing (9) is provided between the skeleton oil seal (81) and the reducer housing (2); the bushing (9) is press-fitted onto the reducer housing (2) through interference fit; the skeleton oil seal (81) is installed between the oil seal mounting hole of the wheel axle (1) and the bushing (9); and a fitting clearance is provided between the bushing (9) and the oil seal mounting hole.
3. The sealing and lubricating structure of the electric forklift reducer according to claim 2, characterized in that: A second O-ring (10) is additionally provided between the chamfer of the bushing (9) and the reducer housing (2).
4. The sealing and lubricating structure of an electric forklift reducer according to claim 1, characterized in that: The wheel shaft (1) and the planet carrier (5) are sealed by an O-ring (6).