Hand-held power tool with a drive motor and a gear mechanism

• US 8,760,013 B2
• Filed: 07/19/2010
• Issued: 06/24/2014
• Est. Priority Date: 08/05/2009
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Esenwein, Florian
• Primary Examiner(s): NGUYEN, HANH N
• Application Number:
  US13/388,987
• Publication Number:
  US 20120187782A1
• Time in Patent Office: 1,436 Days
• Field of Search: 310/50, 310/43, 310216001-216137
• US Class Current: 310/50
• CPC Class Codes: B25F 5/006 Vibration damping means
• CPC Class Codes: B25F 5/02 Construction of casings, bodies or handles B25F5/006, B25F5/008 take precedence

Abstract

A hand-held power tool with a drive motor and a gear mechanism has elastomer elements molded onto the inner side of the housing. At least two elastomer elements form elastomer bearings for bearing the drive motor.

Claims

1. A hand-held power tool, comprising:

a motor housing having an inner face;

a drive motor;

a gear mechanism;

a movement-transmitting unit arranged between the drive motor and the gear mechanism; and

at least two elastomeric elements molded onto the inner face of the motor housing,

wherein the drive motor and the gear mechanism are at least partially decoupled in an axial direction by an axial play between said movement-transmitting unit and at least one of the drive motor and the gear mechanism at a contact point between said movement-transmitting unit and the at least one of the drive motor and the gear mechanism, and

wherein said at least two elastomeric elements are configured to form elastomeric bearings that support the drive motor in the motor housing.

2. The hand-held power tool as claimed in claim 1, wherein the drive motor is mounted in the motor housing solely by the at least two elastomeric bearings.

3. The hand-held power tool as claimed in claim 1, wherein at least one of the at least two elastomeric bearings is configured at least in the form of part of a ring and extends in the circumferential direction of the motor housing.

4. The hand-held power tool as claimed in claim 1, wherein one of the at least two elastomeric bearings has raised portions on a side which faces the drive motor, said raised portions forming contact points for supporting the drive motor.

5. The hand-held power tool as claimed in claim 1, wherein:

the motor housing comprises two half-shells, and

each of the at least two elastomeric bearings comprises two sections which are in the form of part of a ring, and

each of the two sections is arranged in each half-shell of each of the at least two elastomeric bearings.

6. The hand-held power tool as claimed in claim 1, further comprising additional elastomeric sections molded onto the motor housing, wherein:

at least one of the at least two elastomeric bearings is connected to the additional elastomeric sections.

7. The hand-held power tool as claimed in claim 6, further comprising elastomeric material, wherein:

the motor housing has recesses through which the elastomeric material passes, and

the at least one of the at least two elastomeric bearings is connected to said elastomeric material.

8. The hand-held power tool as claimed in claim 1, wherein:

the inner face of the housing includes a recess or a raised portion, and

at least one of the at least two elastomeric bearings is molded into the recess or the raised portion.

9. The hand-held power tool as claimed in claim 1, wherein at least one of the at least two elastomeric bearings bears against a housing-side stop in the axial direction.

10. The hand-held power tool as claimed in claim 1, wherein at least one of the at least two elastomeric bearings is connected to an insertion bevel which extends in the axial direction and includes elastomeric material.

11. The hand-held power tool as claimed in claim 1, wherein at least one of the at least two elastomeric bearings includes a thermoplastic elastomer.

12. The hand-held power tool as claimed in claim 1, wherein the movement-transmitting unit comprises a fan unit having a fan impeller.

13. The hand-held power tool as claimed in claim 12, further comprising a toothed sleeve mounted on a motor shaft of the drive motor,

wherein said toothed sleeve is configured to drive the fan impeller with the toothed sleeve, and

wherein the fan impeller is coupled in terms of movement with axial and/or radial play.

14. The hand-held power tool as claimed in claim 12, further comprising an additional elastomeric element integrated in the fan impeller.

15. The hand-held power tool as claimed in claim 12, further comprising an additional elastomeric element, wherein:

the fan impeller includes a hub and a main body, and

the additional elastomeric element is arranged in the fan impeller between the hub and the main body.

16. The hand-held power tool as claimed in claim 1, wherein the at least two elastomeric elements are integrally molded onto the inner face of the motor housing.

17. The hand-held power tool as claimed in claim 1, wherein the drive motor and the gear mechanism are at least partially decoupled in a radial direction by a radial play between said movement-transmitting unit and at least one of the drive motor and the gear mechanism at the contact point between said movement-transmitting unit and the at least one of the drive motor and the gear mechanism.

18. The hand-held power tool as claimed in claim 1, wherein a first elastomeric element of the at least two elastomeric elements is positioned in contact with a first region of the drive motor, which is proximate to the gear mechanism, and a second elastomeric element of the at least two elastomeric elements is positioned in contact with a second region of the drive motor, which is remote from the gear mechanism.