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air flow management system

A technology for managing systems, air flow, applied to electrical components, lawn mowers, cooling/ventilation devices, etc.

Active Publication Date: 2017-03-01
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Cooling fans have not been used in previous designs of battery-operated robotic lawn trimmers because of the additional power requirements for fan operation

Method used

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Examples

Experimental program
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Embodiment Construction

[0024] figure 1 A lawn trimmer 100 is shown having a housing part 101 , a drive motor 102 for driving a shaft 103 for attachment to a cutting disc 205 , and a gear for driving a cooling fan 201 . A housing portion 105 with vents (not shown) houses the motor and cooling fan, and forms part of the underframe of the trimmer, thereby providing protection for other components of the trimmer, such as the wheels 110, 111, battery pack 301 and control electronics. Provides a mount point.

[0025] In the illustrated embodiment of the invention, the front section of the trimmer is sufficiently sealed from moisture ingress because there are no components in this section that require cooling. The rear section is vented at selected locations to allow cooling during operation. This will be explained in more detail below. Ventilation is also provided at the top of the trimmer. Vents are located on the underside of the housing to protect the trimmer from the weather. In the described emb...

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PUM

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Abstract

The present invention relates to an air flow management system especially for lawn trimmers, especially automatic lawn trimmers. A battery operated robotic lawn trimmer is described having an active air flow management system comprising: at least one first air vent positioned on the underside of the trimmer; at least one second two air vents; an inner housing surrounding the motor; a fan; and at least one cooling air channel within the housing and surrounding the motor. an air flow path is defined between the first and second vents; and the air flow capacity of the at least one second vent is less than the air flow capacity of the at least one cooling air passage such that during operation, The vent draws a larger volume of air than through the second vent.

Description

technical field [0001] The present invention relates to an air flow management system, in particular for lawn trimmers, especially automatic lawn trimmers (also known as self-guided or free-standing trimmers). Background technique [0002] Existing lawn trimmer designs can be prone to overheating of electrical components due to high cutting loads, high ambient temperatures, or a combination of the two. Excessive heat can affect electronics and batteries, especially lithium batteries. This is especially true for automatic lawn trimmers. They are often outside in the sun most or all of the time, especially when they are docked to recharge batteries or simply wait for their next scheduled cutting operation. In the case of lithium batteries, the electronics in these devices are often constructed to prevent product operation when the battery cells are above a certain extreme temperature (typically 70°C), in order to prevent permanent damage or, in extreme cases, burns. fire. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01D75/18A01D101/00
CPCA01D34/008A01D69/02H02K9/06
Inventor R·巴克斯特
Owner ROBERT BOSCH GMBH