Electric Dispensing Tool Motor

Abstract

A brushless DC power tool motor comprises an integrated planetary gear set with a drive drain well suited to create thrust for use in powered caulking dispensers. Disclosed embodiments may comprise a shaft disposed through the center of the motor. The shaft has an acme thread on the exterior with two flats ground on it on opposing sides used to keep the motor shaft from turning. The motor windings are driven with a 12 power transistor control board allowing the motor to be driven in delta or Y configuration, with a “low speed, high torque” mode and a “high speed low torque” mode. The motor controller may determine the mode for the required torque and speed being demanded by the operator.

Claims

1. A brushless DC motor comprising: a) a rear housing guide bushing defined within a rear motor housing; b) an acme shaft having a distal end, with the distal end having two flat surfaces and the two flat surfaces disposed within the rear housing guide bushing so as to prevent the acme shaft from rotating; c) a torque winding concentrically disposed within the rear motor housing; d) a motor core with magnets concentrically disposed within the torque winding; e) a sun gear disposed upon a lower end of the motor core; f) the sun gear in geared connection to a center plate; g) a rear thrust bearing assembly concentrically disposed within the center plate; h) a plurality of planet gears with each planet gear having a shaft and the plurality of planet gears in geared connection to the acme shaft; i) a planet carrier defining an acme thread, the planet carrier defining an inner void, with the acme shaft disposed within the inner void, the planet carrier further defining circumference voids retaining the planet gear shafts; j) a forward thrust bearing assembly concentrically disposed within a lower protrusion of the planet carrier; k) a planet ring nose guide retaining the planet carrier.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG. 1 depicts a side view of a motor

[0016] FIG. 2 depicts a sectional side view of a motor

[0017] FIG. 3 depicts an end view of a motor

[0018] FIG. 4 depicts an exploded view of a motor

[0019] FIG. 5 depicts several views of a planet carrier with an internal acme thread

[0020] FIG. 6 depicts several views of a nose guide

[0021] FIG. 7 depicts various components of a motor core with magnets

REFERENCE NUMERALS IN THE DRAWINGS

[0022] 100 a disclosed electric dispensing tool motor [0023] 105 rear housing guide [0024] 107 rear housing guide bushing [0025] 110 acme shaft with two flats [0026] 112 high speed low torque winding [0027] 113 low speed high torque winding [0028] 120 motor core with magnets [0029] 125 center plate [0030] 130 sun gear [0031] 140 rear thrust bearing assembly [0032] 160 planet gear shafts [0033] 165 planet gears [0034] 170 planet carrier [0035] 173 internal acme thread of planet carrier [0036] 180 forward thrust bearing assembly [0037] 190 nose guide [0038] 195 planet ring gear of nose guide 190 [0039] 197 flats void defined within nose guide 190

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION

[0040] The following detailed description is directed to certain specific embodiments of the invention. However, the invention can be embodied in a multitude of different ways as defined and covered by the claims and their equivalents. In this description, reference is made to the drawings wherein like parts are designated with like numerals throughout.

[0041] Unless otherwise noted in this specification or in the claims, all of the terms used in the specification and the claims will have the meanings normally ascribed to these terms by workers in the art.

[0042] Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise,” “comprising” and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in a sense of “including, but not limited to.” Words using the singular or plural number also include the plural or singular number, respectively. Additionally, the words “herein,” “above,” “below,” and words of similar import, when used in this application, shall refer to this application as a whole and not to any particular portions of this application.

[0043] The above detailed description of embodiments of the invention is not intended to be exhaustive or to limit the invention to the precise form disclosed above. While specific embodiments of, and examples for, the invention are described above for illustrative purposes, various equivalent modifications are possible within the scope of the invention, as those skilled in the relevant art will recognize. For example, while steps are presented in a given order, alternative embodiments may perform routines having steps in a different order. The teachings of the invention provided herein can be applied to other systems, not only the systems described herein. The various embodiments described herein can be combined to provide further embodiments. These and other changes can be made to the invention in light of the detailed description.

[0044] Any and all the above references and U.S. patents and applications are incorporated herein by reference. Aspects of the invention can be modified, if necessary, to employ the systems, functions and concepts of the various patents and applications described above to provide yet further embodiments of the invention.

[0045] FIG. 1 depicts an external side view of a disclosed motor system 100.

[0046] FIG. 2 depicts an end view of a disclosed motor system.

[0047] FIG. 3 depicts a sectional view of FIG. 1 and discloses various internal components such as a planet carrier, planet ring hear disposed in the front housing, high speed low torque winding ow speed high torque winding, ball bearings support for motor core and other components.

[0048] FIG. 4 depicts an exploded view of a disclosed embodiment.

[0049] FIG. 5 depicts various views of a disclosed planet carrier 170 with the planet carrier having internal acme threading 173.

[0050] FIG. 6 depicts a nose guide 190 with the nose guide defining a flat void 197. The flat void of flats used to prevent the motor shaft from turning.

[0051] FIG. 7 depicts various views of a motor core with magnet assembly, which may include bonded rare earth magnets, planetary sun gear disposed upon the motor core, a motor core hollow void to accept the shaft, ball bearings and other components.

[0052] Disclosed embodiments are well suited for a brushless DC power tool motor with integrated planetary gear set. Disclosed drive trains are very useful to create thrust for use in powered caulking dispensers.

[0053] Further features that overcome shortfalls in the prior art include:

[0054] Shaft going through the center of the motor. The shaft has an acme thread on the exterior with two flats ground on it on opposing sides used to keep the motor shaft from turning.

[0055] The planet carrier is constrained with roller thrust bearings in both directions and otherwise floats radially in the gear set maintaining perfect gear mesh under load.

[0056] Features that apply to other power tools as well:

[0057] The motor windings are driven with a 12 power transistor control board allowing the motor to be driven in delta or Y configuration, with a “low speed, high torque” mode and a “high speed low torque” mode. The motor controller will determine the mode for the required torque and speed being demanded by the operator. The innovative use of a dual drive control board eliminates the high/low gear change requirement to have a tool with very high torque and high speed. This feature will also apply to handheld drills that currently need a high/low gear selector to cover the operating range.