Walking transmission structure of electric construction machinery

Abstract

This patent provides a walking transmission structure for electric construction machinery that does not obstruct the rotation of the slewing system relative to the chassis, has no cable connection between the slewing system and the chassis, is safe and reliable, and can drive the construction machinery. The construction machinery has a chassis and a slewing system that rotates relative to the chassis around a slewing axis; two walking drive motors are mounted on the slewing system, and two coaxially arranged transmission shafts are coaxial with the slewing axis. The upper end of each transmission shaft is directly or indirectly connected to a walking drive motor, and the lower ends of the two transmission shafts are respectively connected to the left and right drive wheels through a transmission mechanism mounted on the chassis. The two walking drive motors drive the left and right drive wheels through the transmission shafts and transmission mechanism, thus moving the construction machinery.

Description

Technical Field

[0001] This patent relates to engineering machinery, specifically, a transmission mechanism for driving engineering machinery to move. Background Technology

[0002] With the increasing prevalence of electric systems, electrification of construction machinery has become a trend. Taking excavators as an example, excavators have also begun to use electric systems. However, their movement still relies on an electric-hydraulic system, where an electric motor drives a hydraulic pump, and then a hydraulic valve controls the hydraulic motor to achieve movement control. To achieve unrestricted slewing motion, a hydraulic slewing valve is installed at the slewing point. This control structure is inefficient due to the need for electro-hydraulic conversion, and the high oil temperature accelerates the aging of the oil and sealing system, resulting in high system maintenance costs. Summary of the Invention

[0003] The purpose of this patent is to provide a walking transmission structure for electric construction machinery that does not hinder the rotation of the slewing system relative to the chassis, has no cable connection between the slewing system and the chassis, is safe and reliable, and can drive the construction machinery to move.

[0004] This patent discloses a walking transmission structure for electric construction machinery. The construction machinery has a chassis and a rotary system that rotates relative to the chassis around a rotary axis. Two walking drive motors are mounted on the rotary system, and two coaxially arranged transmission shafts are coaxial with the rotary axis. The upper end of each transmission shaft is directly or indirectly connected to a walking drive motor, and the lower ends of the two transmission shafts are respectively connected to the left drive wheel and the right drive wheel through a transmission mechanism mounted on the chassis. The two walking drive motors drive the left drive wheel and the right drive wheel through the transmission shafts and the transmission mechanism, thereby moving the construction machinery.

[0005] As an improvement, the transmission mechanism includes a left half-shaft and a right half-shaft rotatably mounted on the chassis; the left driving wheel and the right driving wheel are connected to the left half-shaft and the right half-shaft respectively, and the left driven bevel gear and the right driven bevel gear are fixed on the left half-shaft and the right half-shaft respectively; the lower ends of the two transmission shafts are fixed to the left driving bevel gear and the right driving bevel gear respectively; the left driving bevel gear and the right driving bevel gear mesh with the left driven bevel gear and the right driven bevel gear respectively.

[0006] As an improvement, both the left and right drive wheels are sprockets. The left and right drive wheels drive the left and right drive wheels mounted on the chassis via chains, respectively, to move the construction machinery.

[0007] The walking transmission structure of the electric engineering machinery as described in claim 1 is characterized in that: the output shaft of a walking drive motor is directly connected to the upper end of a transmission shaft.

[0008] As an improvement, the output shaft of a walking drive motor is connected to the upper end of a drive shaft via a power transmission mechanism.

[0009] As an improvement, one of the two drive shafts is a hollow shaft that is loosely fitted around the outer circumference of the other drive shaft.

[0010] As an improvement, the lower end of the drive shaft that passes through the hollow shaft extends out of the lower end of the hollow shaft and is rotatably supported on the chassis.

[0011] As an improvement, the upper end of the hollow shaft is rotatably supported on the rotary system, and a driven gear is fixed to the outer circumference of the upper end of the hollow shaft. This driven gear meshes with a driving gear on the output shaft of a travel drive motor. The upper end of the transmission shaft that passes through the hollow shaft extends out of the upper end of the hollow shaft and is rotatably supported on the hollow shaft or the driving gear.

[0012] The beneficial effects of this patent are: using two coaxially arranged drive shafts to transmit the power of the travel drive motor to the chassis, with the drive shafts being coaxial with the rotation axis of the slewing system of the construction machinery relative to the chassis. The travel drive motor is located on the slewing system, and its cable does not need to extend through the slewing position of the slewing system to the chassis, thus the slewing motion of the slewing system is unrestricted. Attached Figure Description

[0013] Figure 1 This is a diagram of the walking transmission structure of electric engineering machinery;

[0014] Figure 2 yes Figure 1 The right view;

[0015] Figure 3 yes Figure 1 A schematic diagram showing the connection relationship between the transmission shaft 2 (4), driven gear 1 (5), driven gear 2 (6), driving gear 1 (7), right driving bevel gear 9, and left driving bevel gear 10. Detailed Implementation

[0016] See Figure 1 , 2 The diagram illustrates the walking transmission structure of an electric construction machine. The machine has a chassis 100 and a rotary system 200 that rotates relative to the chassis about a rotary axis. A first walking drive motor 1 and a second walking drive motor 2 are mounted on the rotary system. Two coaxially arranged drive shafts 3 and 4 are coaxial with the rotary axis. Drive shaft 3 is a hollow shaft loosely fitted around drive shaft 4.

[0017] See Figure 3The upper part of the hollow shaft is rotatably supported on the rotary system by bearings. A driven gear 5 is fixed to the outer circumference of the upper end of the hollow shaft (the hollow shaft and driven gear 5 can be integrated). Driven gear 5 meshes with drive gear 7 on the output shaft of the travel drive motor 1. The upper part of the transmission shaft 4, which passes through the hollow shaft, extends out of the hollow shaft and is rotatably supported by bearings at the inner hole of driven gear 5. Driven gear 6 is fixed to the upper end of transmission shaft 4. Driven gear 6 meshes with drive gear 8 on the output shaft of the travel drive motor 2.

[0018] The lower end of the drive shaft 4 extends beyond the lower end of the hollow shaft and is fixed with a left drive bevel gear 10, which is rotatably mounted on the chassis. A right drive bevel gear 9 is fixed to the lower end of the hollow shaft and is rotatably mounted on the chassis.

[0019] A left half-shaft 12 and a right half-shaft 11 are rotatably mounted on the chassis; a left drive wheel 14 and a right drive wheel 13 are connected to the left half-shaft and the right half-shaft respectively; a left driven bevel gear 16 and a right driven bevel gear 15 are fixed on the left half-shaft and the right half-shaft respectively; a left drive bevel gear 10 and a right drive bevel gear 9 mesh with the left driven bevel gear 16 and the right driven bevel gear 15 respectively.

[0020] Both the left drive wheel 14 and the right drive wheel 13 are sprockets. The left drive wheel and the right drive wheel drive the left drive wheel 18 and the right drive wheel 17 mounted on the chassis via the chain 300, respectively, to drive the construction machinery to move.

[0021] 1. Innovative Structure: Two coaxial drive shafts are used to transmit power from the drive motors to the chassis. One end of each drive shaft is directly or indirectly connected to a drive motor, and the other end is directly or indirectly connected to the left and right drive wheels of the construction machinery via a transmission mechanism. The drive shafts are coaxial with the rotation axis of the construction machinery.

[0022] 2. Innovation: By using two coaxial rotating shafts to transmit the power of the two drive motors to the two drive wheels respectively, the electric construction machinery can turn without restriction. At the same time, compared with the structure of mounting the drive motors on the chassis, there are no cables at the turning point of the construction machinery, making it safe and reliable.

[0023] 3. Working principle description:

[0024] Taking an excavator as an example, when the excavator moves in a straight line, the two travel drive motors rotate at the same speed. When the excavator needs to turn, the two travel drive motors are controlled to rotate at different speeds to achieve turning. At the same time, the slewing system (the specific structure is not described here) is controlled to the required state according to the work needs. When the excavator needs to slew (the slewing system rotates relative to the chassis), since the travel drive motors are mounted on the slewing system on the upper part of the excavator, they will rotate with the upper part, which will cause the excavator to move. Therefore, if it is necessary to keep the excavator stationary when slewing, the travel drive motors need to be controlled to rotate in the opposite direction to counteract the relative rotation caused by the slewing.

[0025] When the travel drive motor rotates, it drives the drive shaft to rotate, which in turn drives the bevel gear pair connected to the drive shaft on the chassis to rotate. The bevel gear pair changes the rotation axis of the drive shaft by 90 degrees, and then transmits the power to the drive sprocket through the half shaft, and then to the track drive wheel through the transmission chain, thus driving the excavator to move.

[0026] 4. The connection between the motor and the transmission shaft can be through gear meshing, direct connection between the motor shaft and the transmission shaft, or connection through other power transmission mechanism shafts. The specific connection structure does not affect the scope of protection of the claims of this invention.

[0027] Of the two coaxial drive shafts, at least one is a hollow structure.

[0028] The transmission mechanism that connects the drive shaft to the excavator's drive wheels can be any transmission system capable of transmitting the power of the coaxially arranged drive shaft to the excavator's drive wheels, and its specific structure does not affect the scope of protection of the claims of this invention.

[0029] The engineering machinery mentioned can be any type of engineering machinery with unlimited turning ability.

[0030] Along the entire transmission route from the drive motor to the drive wheels, auxiliary mechanisms such as brakes and locking mechanisms can be installed, which does not affect the scope of protection of the claims of this invention.

Claims

1. A walking transmission structure for electric construction machinery, wherein the construction machinery has a chassis and a rotary system that rotates relative to the chassis about a rotation axis; characterized in that: Two drive motors are mounted on the slewing system. Two coaxial drive shafts are coaxial with the slewing axis. The upper end of each drive shaft is directly or indirectly connected to a drive motor. The lower ends of the two drive shafts are connected to the left and right drive wheels respectively through a transmission mechanism mounted on the chassis. The two drive motors drive the left and right drive wheels through the drive shafts and transmission mechanism, thus moving the construction machinery. When the electric construction machinery needs to turn (i.e., the slewing system rotates relative to the chassis), the drive motors, mounted on the slewing system, will rotate with the slewing system, causing the electric construction machinery to move. Therefore, when turning and needing to keep the electric construction machinery stationary, the drive motors are controlled to rotate in the opposite direction to counteract the relative rotation caused by the turning.

2. The walking transmission structure of the electric engineering machinery as described in claim 1, characterized in that: The transmission mechanism includes a left half-shaft and a right half-shaft rotatably mounted on the chassis; the left drive wheel and the right drive wheel are connected to the left half-shaft and the right half-shaft respectively; the left driven bevel gear and the right driven bevel gear are fixed on the left half-shaft and the right half-shaft respectively; the lower ends of the two transmission shafts are fixed to the left drive bevel gear and the right drive bevel gear respectively; the left drive bevel gear and the right drive bevel gear mesh with the left driven bevel gear and the right driven bevel gear respectively.

3. The walking transmission structure of the electric engineering machinery as described in claim 2, characterized in that: Both the left and right drive wheels are sprockets. The left and right drive wheels drive the left and right drive wheels mounted on the chassis via chains, respectively, to move the construction machinery.

4. The walking transmission structure of the electric engineering machinery as described in claim 1, characterized in that: The output shaft of a walking drive motor is directly connected to the upper end of a transmission shaft.

5. The walking transmission structure of the electric engineering machinery as described in claim 1, characterized in that: The output shaft of a walking drive motor is connected to the upper end of a transmission shaft via a power transmission mechanism.

6. The walking transmission structure of the electric engineering machinery as described in claim 1, characterized in that: Of the two drive shafts, one is a hollow shaft that is loosely fitted around the outer circumference of the other drive shaft.

7. The walking transmission structure of the electric engineering machinery as described in claim 6, characterized in that: The lower end of the drive shaft that passes through the hollow shaft extends out of the hollow shaft and is rotatably supported on the chassis.

8. The walking transmission structure of the electric engineering machinery as described in claim 6, characterized in that: The upper end of the hollow shaft is rotatably supported on the rotary system. A driven gear is fixed on the outer circumference of the upper end of the hollow shaft, which meshes with the driving gear on the output shaft of a travel drive motor. The upper end of the transmission shaft that passes through the hollow shaft extends out of the upper end of the hollow shaft and is rotatably supported on the hollow shaft or the driving gear.

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