Wet brake structure of electric forklift

Abstract

The utility model belongs to the technical field of wet braking systems, and particularly relates to a wet braking structure of an electric forklift. Comprising a wet brake assembly, a reduction gearbox shell and a brake support, the wet brake assembly comprises a friction plate and a dual steel sheet, the friction plate is meshed with the brake support through a spline, a boss is arranged on the dual steel sheet, a shell groove is formed in the reduction gearbox shell, and the boss is correspondingly arranged in the shell groove. The shell groove is formed in the reduction gearbox shell, the boss arranged on the dual steel sheet is utilized, the boss is arranged in the shell groove, stable connection can be established between the dual steel sheet and the reduction gearbox shell, the machining mode is simple, installation is convenient, the precision requirement is low, and cost is low. And secondly, the dual steel disc is connected with the reduction gearbox shell through the boss, when the friction plate and the dual steel disc are pressed tightly, torque can be stably transmitted through the boss, and the braking performance can be improved conveniently.

Description

Technical Field

[0001] The utility model belongs to the technical field of wet brake systems, in particular to a wet brake structure for an electric forklift. Background Art

[0002] In the existing material handling industry, electric forklifts are increasingly gaining market share, gradually replacing internal combustion forklifts. Existing electric forklift drive systems utilize a wet brake assembly within the reduction gearbox, where friction plates within the wet brake assembly engage and press against opposing steel plates to achieve braking.

[0003] However, the traditional spline connection method has high processing costs and is not conducive to the installation of multi-plate wet brakes. Therefore, it is necessary to design an electric forklift wet brake structure to solve the above problems. Utility Model Content

[0004] In view of the above problems, the present invention provides a wet brake structure for an electric forklift to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a wet brake structure of an electric forklift, comprising a wet brake assembly, a reduction gear housing and a brake bracket, wherein the wet brake assembly comprises a friction plate and a dual steel plate, wherein the friction plate is engaged with the brake bracket via a spline, a boss is provided on the dual steel plate, a shell groove is provided in the reduction gear housing, and the boss is correspondingly arranged in the shell groove.

[0006] Furthermore, five bosses are circumferentially arranged on the dual steel sheets, and five housing grooves are correspondingly opened in the reduction gearbox housing, and the five bosses are correspondingly arranged in the five housing grooves.

[0007] Furthermore, the electric forklift wet brake structure further includes a cover plate, a primary passive gear and a sun gear shaft, wherein the primary passive gear, the brake bracket, the sun gear shaft and the wet brake assembly are all arranged in the reduction gearbox housing, and the cover plate is closed on the housing;

[0008] The brake bracket is fixed to the first-stage passive gear by bolts, and the brake bracket is driven by meshing with the external spline at one end of the sun gear shaft through the internal spline. The other end of the sun gear shaft is a sun gear, and the sun gear is meshed with the planetary gear for transmission. The friction plate and the dual steel plate are located between the first-stage passive gear and the sun gear shaft.

[0009] Furthermore, the wet brake assembly also includes a brake operating lever, which is mounted on the cover plate.

[0010] Furthermore, the wet brake assembly also includes a pressure pin and a sliding bearing, and the pressure pin and the sliding bearing are both mounted on the cover plate.

[0011] Furthermore, the wet brake assembly further includes a pressure plate and a spring. The pressure plate is arranged between the brake bracket and the driven gear. The pressure plate and the sun gear shaft together form a cavity, and the spring is arranged in the cavity.

[0012] Technical effects and advantages of this utility model:

[0013] By opening a housing groove in the reduction gear housing and utilizing the boss provided on the dual steel sheet, a stable connection can be established between the dual steel sheet and the reduction gear housing by setting the boss in the housing groove. The processing method is simple, the installation is convenient, the precision requirement is low, and the cost is low.

[0014] The dual steel plates are connected to the reduction gearbox housing through bosses. When the friction plates and the dual steel plates are pressed tightly, the torque can be stably transmitted through the bosses, thereby improving the braking performance.

[0015] The friction plate and the dual steel plate are placed between the first-stage passive gear and the sun gear shaft, so that there is sufficient lubricating oil, which is beneficial to the cooling of the friction plate, improves the reliability of braking performance and prolongs the service life.

[0016] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram showing the structure of the reduction gearbox housing and the dual steel sheets of an embodiment of the present utility model is shown;

[0019] Figure 2 A schematic structural diagram of a reduction gearbox housing according to an embodiment of the present invention is shown;

[0020] Figure 3 The figure shows a schematic structural diagram of the wet brake structure of an electric forklift according to an embodiment of the present utility model.

[0021] Figure numerals: 1. Gearbox housing; 11. Housing groove; 2. Cover plate; 31. Drive gear; 32. Primary passive gear; 33. Brake bracket; 34. Sun gear shaft; 35. Bolt; 41. Pressure plate; 42. Sliding bearing; 43. Pressure pin; 44. Brake lever; 45. Spring; 46. Dual steel sheet; 461. Boss; 47. Friction plate. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments 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 shall fall within the scope of protection of the present invention.

[0023] like Figures 1 to 3 As shown, an electric forklift wet brake structure according to an embodiment of the present invention includes a wet brake assembly and a reduction gear housing 1. The wet brake assembly includes a friction plate 47 and a dual steel plate 46. The friction plate 47 is engaged with the brake bracket 33 through a spline. A boss 461 is provided on the dual steel plate 46. A shell groove 11 is opened in the reduction gear housing 1, and the boss 461 is correspondingly arranged in the shell groove 11.

[0024] Specifically, the shape of boss 461 is designed to match the housing groove 11. The optimal shapes and dimensions of boss 461 and housing groove 11 are determined through calculation. Secondly, boss 461 is integrally formed with the mating steel plate 46. Furthermore, the inner ring of friction plate 47 mates with the outer splines of brake bracket 33 via internal splines to transmit torque.

[0025] In this embodiment, by opening a housing groove 11 in the reduction gear housing 1 and utilizing the boss 461 provided on the dual steel sheet 46, a stable connection can be established between the dual steel sheet 46 and the reduction gear housing 1 by setting the boss 461 into the housing groove 11. The processing method is simple, the installation is convenient, the precision requirement is low, and the cost is low.

[0026] Secondly, the dual steel plate 46 is connected to the reduction gearbox housing 1 through the boss 461. When the friction plate 47 is pressed against the dual steel plate 46, the torque can be stably transmitted through the boss 461, thereby improving the braking performance.

[0027] Alternatively, as Figure 2 and Figure 3As shown, five bosses 461 are provided on the outer circumference of the dual steel sheets 46 , and five housing grooves 11 are correspondingly provided in the reduction gearbox housing 1 , and the five bosses 461 are correspondingly provided in the five housing grooves 11 .

[0028] Specifically, the number of bosses 461 and housing grooves 11 are obtained by calculation. Secondly, the five bosses 461 can be evenly distributed around the outer sides of the dual steel sheets 46 .

[0029] In this embodiment, five bosses 461 are arranged circumferentially on the dual steel plate 46, and five housing grooves 11 are opened in the reduction gearbox housing 1. The five bosses 461 are correspondingly arranged in the five housing grooves 11. When the friction plate 47 is pressed against the dual steel plate 46, torque can be transmitted through the five bosses 461, which is beneficial to improving the stability of torque transmission and facilitating the improvement of braking performance.

[0030] Alternatively, as Figure 3 As shown, the electric forklift wet brake structure further includes a cover plate 2, a primary passive gear 32, a brake bracket 33 and a sun gear shaft 34. The primary passive gear 32, the brake bracket 33, the sun gear shaft 34 and the wet brake assembly are all arranged in the reduction gear housing 1, and the cover plate 2 covers the reduction gear housing 1;

[0031] The brake bracket 33 is fixed to the first-stage passive gear 32 by bolts 35. The brake bracket 33 is driven by meshing with the external spline at one end of the sun gear shaft 34 through the internal spline. The other end of the sun gear shaft is a sun gear, and the sun gear is meshed with the planetary gear for transmission. The friction plate 47 and the dual steel plate 46 are located between the first-stage passive gear 32 and the sun gear shaft 34.

[0032] Specifically, the electric forklift wet brake structure further includes a drive motor and a drive gear 31 , and the drive motor drives the drive gear 31 to generate power.

[0033] In this embodiment, by integrating the wet brake assembly into the reduction gear housing 1 and positioning the friction plate 47 and the paired steel plate 46 between the primary driven gear 32 and the sun gear shaft 34, a wheel-side deceleration braking effect is achieved. Furthermore, by placing the friction plate 47 within the reduction gear housing 1 and utilizing the lubricating oil within the reduction gear housing 1 for cooling and lubrication, the structure is compact and simple, eliminating the need for separate brake components and saving costs. Furthermore, varying braking performance can be achieved by increasing or decreasing the number of friction plates 47 and paired steel plates 46.

[0034] Alternatively, as Figure 3 As shown, the wet brake assembly further includes a brake operating rod 44 , which is mounted on the cover plate 2 .

[0035] In this embodiment, the brake operating lever 44 is mounted on the cover plate 2 and is designed to consist of an oil cylinder oil pipe interface, a brake cable interface, and a brake hydraulic oil chamber.

[0036] Alternatively, as Figure 3 As shown, the wet brake assembly further includes a pressure pin 43 and a sliding bearing 42 , and both the pressure pin 43 and the sliding bearing 42 are mounted on the cover plate 2 .

[0037] In this embodiment, the pressure pin 43 is mounted on the cover plate 2 and sealed by an oil seal, and the sliding bearing 42 is mounted on the cover plate 2 by a positioning pin.

[0038] Alternatively, as Figure 3 As shown, the wet brake assembly further includes a pressure plate 41 and a spring 45. The pressure plate 41 is arranged between the brake bracket 33 and the driven gear. The pressure plate 41 and the sun gear shaft 34 together form a cavity, and the spring 45 is arranged in the cavity.

[0039] In this embodiment, when the vehicle does not provide braking pressure, the spring 45 is not under force, the pressure plate 41 is acted upon by the spring 45, and fits against the end face of the first-stage passive gear 32. The friction plate 47 and the dual steel plate 46 are in a loosened state, and there is no braking effect. Under the action of the brake fluid pressure, the brake operating lever pushes the pressure pin 43, and the pressure acts on the pressure plate 41, pushing the pressure plate 41 to press the friction plate 47 and the dual steel plate 46 tightly, thereby achieving a braking effect. Similarly, braking can be achieved by pulling up the brake operating lever 44 through the brake cable.

[0040] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A wet brake structure for an electric forklift, characterized in that: The invention comprises a wet brake assembly, a reduction gear housing (1) and a brake bracket (33), wherein the wet brake assembly comprises a friction plate (47) and a dual steel plate (46), wherein the friction plate (47) is engaged with the brake bracket (33) via a spline, and a boss (461) is provided on the dual steel plate (46), and a housing groove (11) is provided in the reduction gear housing (1), and the boss (461) is correspondingly arranged in the housing groove (11).

2. The electric forklift wet brake structure according to claim 1, characterized in that: Five housing grooves (11) are correspondingly provided in the reduction gearbox housing (1), five bosses (461) are circumferentially provided on the dual steel sheets (46), and the five bosses (461) are correspondingly provided in the five housing grooves (11).

3. The wet brake structure of an electric forklift according to claim 1, characterized in that: It also includes a cover plate (2), a first-stage passive gear (32), and a sun gear shaft (34); the first-stage passive gear (32), the brake bracket (33), the sun gear shaft (34), and the wet brake assembly are all arranged in the reduction gear housing (1); the cover plate (2) covers the reduction gear housing (1); The brake bracket (33) is fixed to the primary passive gear (32) by bolts (35); the brake bracket (33) is meshed with the external spline at one end of the sun gear shaft (34) through an internal spline; the other end of the sun gear shaft (34) is a sun gear, and the sun gear is meshed with the planetary gear for transmission; the friction plate (47) and the dual steel plate (46) are located between the primary passive gear (32) and the sun gear shaft (34).

4. The electric forklift wet brake structure according to claim 3, characterized in that: The wet brake assembly further comprises a brake operating lever (44), and the brake operating lever (44) is mounted on the cover plate (2).

5. The electric forklift wet brake structure according to claim 4, characterized in that: The wet brake assembly further comprises a pressure pin (43) and a sliding bearing (42), wherein the pressure pin (43) and the sliding bearing (42) are both mounted on the cover plate (2).

6. The electric forklift wet brake structure according to claim 5, characterized in that: The wet brake assembly further comprises a pressure plate (41) and a spring (45); the pressure plate (41) is arranged between the brake bracket (33) and the driven gear; the pressure plate (41) and the sun gear shaft (34) together form a cavity; the spring (45) is arranged in the cavity.

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