CN108121188B

CN108121188B - Barrel for a timepiece

Info

Publication number: CN108121188B
Application number: CN201711208649.2A
Authority: CN
Inventors: 曼努埃尔·乌利希; 克里斯托夫·施伦克尔; 史蒂夫·莱曼
Original assignee: Lange Uhren GmbH
Current assignee: Lange Uhren GmbH
Priority date: 2016-11-28
Filing date: 2017-11-27
Publication date: 2021-10-08
Anticipated expiration: 2037-11-27
Also published as: DE102016122936B4; JP2018091838A; JP6498259B2; CH713178A2; CH713178B1; CN108121188A; DE102016122936A1

Abstract

The invention relates to a barrel for a timepiece, comprising a rotatably mounted first barrel drum, which coaxially surrounds a rotatably mounted first barrel core at a radial distance, said first barrel core being surrounded by a helical first tension spring, which is connected by its inner end to the first barrel core and by its outer end to the first barrel drum. The winding wheel with the gear ring is connected in a rotationally fixed manner to the first barrel drum. A second barrel drum is connected in a rotationally fixed manner coaxially with the first barrel core, which encloses a rotatably mounted second barrel core coaxially at a radial distance, and is enclosed by a helical second tension spring which is connected by its inner end to the second barrel core and by its outer end to the second barrel drum, wherein a wheel of a gear mechanism of the timepiece is connected in a rotationally fixed manner coaxially with the second barrel core.

Description

Barrel for a timepiece

Technical Field

The invention relates to a barrel for a timepiece.

Background

In the prior art, a barrel of a timepiece has a rotatably mounted first barrel drum which coaxially surrounds a rotatably mounted first barrel core at a radial distance, which is surrounded by a helical first tension spring which is connected with its inner end to the first barrel core and with its outer end to the first barrel drum, wherein a winding wheel with a gear ring is connected in a rotationally fixed manner to the first barrel drum. The barrel of the prior art has a small travel reserve with a low space requirement.

Disclosure of Invention

The invention is based on the object of providing a barrel for a timepiece of the type mentioned at the outset, which barrel has a large travel reserve with a low space requirement.

The invention proposes: the barrel of a timepiece has a rotatably mounted first barrel drum coaxially surrounding a rotatably mounted first barrel core at a radial distance, the first barrel core being surrounded by a helical first tension spring which is connected by its inner end to the first barrel core and by its outer end to the first barrel drum, wherein a winding wheel with a gear ring is connected in a rotationally fixed manner to the first barrel drum.

According to the invention, this object is achieved in that: a second barrel drum is connected in a rotationally fixed manner coaxially with the first barrel core, which coaxially surrounds a rotatably mounted second barrel core at a radial distance, and is surrounded by a helical second tension spring which is connected with its inner end at the second barrel core and with its outer end to the second barrel drum, wherein a wheel of a gear mechanism of the timepiece is connected in a rotationally fixed manner coaxially with the second barrel core.

The two tension springs, although arranged parallel to each other, are connected in series. This results in a large travel reserve if the torques are as identical as possible.

A better height-thickness ratio of the tension springs can be achieved than with the single tension springs, as a result of which the tension springs can be produced more easily with such a high torque. Furthermore, the life is significantly longer than with a single spring.

If the first barrel drum and/or the second barrel drum is/are designed in the form of a can with the first base and/or the second base, a stable design results with a smaller wall thickness.

If the first barrel core is sleeve-shaped and is rotatably mounted on the coaxial bearing projection of the second barrel core, the two barrel drums are mounted in a reliably guided manner, so that tilting of the barrel drums is at least largely avoided.

Furthermore, this also results in a small constructional size of the barrel.

In a simple embodiment, the bearing projection of the second barrel core projects with its free end from the sleeve-like projection of the second barrel drum and is rotatably mounted with the free end in the radial bearing.

For simple coaxial positioning, the sleeve-like projection of the second barrel drum is axially supported at the radial bearing.

In order to achieve a reduction in friction, a jewel bearing can be introduced on the inside of the sleeve-like projection of the second barrel drum, in which jewel bearing the bearing projection of the second barrel is rotatably supported.

For radially positioning the first spring drum, the first spring drum can have a concentric bearing shoulder which is rotatably mounted in a corresponding bearing bore of the fixed wheel axle.

In order to correctly axially position the first and second barrel drums relative to each other, the second barrel drum can have a larger cross section than the bearing projection, wherein the bottom of the second barrel drum is axially supported at a radial transition from the second barrel drum having the larger cross section to the bearing projection.

The first spring drum is guided axially and radially on the fixed axle in a simple manner if the first base of the first drum is stepped on the side of the first base facing the winding wheel and a radially outwardly open, radially encircling guide groove is formed between the radially outer step and the winding wheel, the width of which guide groove is the same as the thickness of the axle into which the axle with the axle bore is inserted.

Drawings

Embodiments of the invention are illustrated in the drawings and described in detail below. As shown in the drawings, in which,

figure 1 shows a top view of the barrel of a timepiece,

figure 2 shows a section along the line X-X of the barrel according to figure 1,

fig. 3 shows a further cross-sectional view of the barrel of the timepiece.

Detailed Description

The barrel for a timepiece shown has a first barrel drum 1 with a first bottom 2 on its upper side.

The first base part 2 is stepped on its side facing away from the drum interior of the first spring drum 1, wherein the first base part 2 has a larger diameter and a smaller thickness on its side facing toward the drum interior than on its side facing away from the drum interior, and has a smaller diameter and a larger thickness on its side facing away from the drum interior.

On the side of the first base 2 remote from the drum interior of the first barrel drum 1, a winding wheel 3 is arranged, the outer diameter of which is approximately the same as the outer diameter of the first base 2, and which is fixedly connected to the winding wheel 3 by means of a plurality of bolts arranged distributed over the circumference.

An annular guide groove 4 is formed in the region of the smaller thickness of the first bottom 2 and in the winding wheel 3.

The fixed wheel axle 18 of the timepiece has an axle bore 19 with a diameter corresponding to the diameter of the guide groove 4 at the bottom 20 of greater thickness in the radially inner region forming a bearing shoulder 23.

Before screwing together the first bottom 2 of the first spring drum 1 and the winding wheel 3, the first bottom 2 is inserted with its bearing shoulder 23 into the wheel bridge bore 19 and the winding wheel 3 is subsequently screwed onto the first bottom 2 by means of the screw 21. The first bottom 2 abuts the wheel bridge 18, thereby protecting the first barrel drum 1 from tilting.

The winding wheel 3 has a bore 5 in the center, into which an annular collar 6 of the first bottom 2 projects.

A second barrel drum 7 is arranged parallel to the first barrel drum 1, which second barrel drum has a second bottom 8 on its side facing the first barrel drum 1.

The second base 8 has coaxially a sleeve-like projection 22 which projects into the drum interior of the first barrel drum 1 and is screwed to the first spring core 9.

A first helical first tension spring 10 is arranged in the drum interior of the first spring drum 1, surrounds the first spring core 9 and is connected with its outer end to the first spring drum 1 and with its inner end to the first spring core 9.

A second spring core 11 is coaxially arranged in the drum interior of the second barrel drum 7 and is surrounded by a helical second tension spring 12, which is connected with its outer end to the second barrel drum 7 and with its inner end to the second spring core 11.

The second barrel core 11 has a bearing projection 13 with a smaller diameter, on which a sleeve-like projection 22 of the second barrel drum 7 is rotatably mounted.

The bearing projection 13 projects with its free end from the sleeve-like projection 22 and is rotatably supported in a jewel bearing of the radial bearing 14. For this purpose, the jewel bearing is fixedly arranged in the sleeve bore 15 of the collar 6 of the first spring drum 1.

The sleeve-like projection 22 is supported axially with its end face on the jewel bearing.

The second bottom 8 of the second barrel drum 7 is axially supported at a radial transition 16 from the second barrel core 11 to the bearing projection 13.

A wheel 17 of the gear mechanism of the timepiece is arranged coaxially in a rotationally fixed manner in the end region of the second winding core 11 facing away from the winding wheel 3.

Winding wheel 3 can be turned, for example, by means of the winding crown of the timepiece and thus tensions the two tension springs 10 and 12.

List of reference numerals

1 first barrel drum

2 first bottom

3 winding wheel

4 guide groove

5 drilling

6 rand

7 second barrel drum

8 second bottom

9 first spring core

10 first tension spring

11 second barrel

12 second tension spring

13 bearing projection

14 radial bearing

15 sleeve bore

16 radial transition

17 wheel

18-wheel axle

19 wheel axle drilling

20 bottom

21 bolt

22 sleeve-like projection

23 bearing shoulders.

Claims

1. A barrel for a timepiece, having a rotatably mounted first barrel drum (1) which coaxially surrounds a rotatably mounted first barrel core (9) at a radial distance and which is surrounded by a helical first tension spring (10) which is connected with its inner end at the first barrel core (9) and with its outer end to the first barrel drum (1), wherein a winding wheel (3) with a gear ring is connected in a rotationally fixed manner to the first barrel drum (1), characterized in that a second barrel drum (7) is connected in a rotationally fixed manner coaxially to the first barrel core (9) and which coaxially surrounds a rotatably mounted second barrel core (11) at a radial distance and which is surrounded by a helical second tension spring (12), the second tension spring is connected by its inner end to the second spring barrel core (11) and by its outer end to the second spring barrel drum (7), wherein a wheel (17) of a gear mechanism of the timepiece is connected in a rotationally fixed manner coaxially to the second spring barrel core (11), wherein the first spring barrel core (9) is sleeve-shaped and is rotatably supported on a coaxial bearing projection (13) of the second spring barrel core (11), and wherein the bearing projection (13) of the second spring barrel core (11) projects by its free end from a sleeve-shaped projection (22) of the second spring barrel drum (7) and is rotatably supported by the free end in a radial bearing (14).

2. A barrel according to claim 1, wherein said first barrel drum (1) and/or said second barrel drum (7) is configured in the shape of a can with a first bottom (2) and/or a second bottom (8).

3. A barrel according to claim 1, wherein said sleeve-like projection (22) of said second barrel drum (7) is axially supported at said radial bearing (14).

4. A barrel according to claim 2, wherein the first barrel drum (1) has a concentric collar (6) rotatably supported in a corresponding bore (5) of a fixed wheel bridge (18).

5. A barrel according to claim 2, wherein said second barrel drum (11) has a larger cross section than said bearing projection (13), wherein said second bottom (8) of said second barrel drum (7) is axially supported at a radial transition (16) from said second barrel drum (11) having a larger cross section to said bearing projection (13).

6. A barrel according to claim 4, wherein the first bottom (2) of the first barrel drum (1) is stepped on its side facing the winding wheel (3) and forms a radially outwardly open and radially encircling guide groove (4) between a radially outer step and the winding wheel (3), the width of which guide groove is the same as the thickness of the wheel bridge (18), into which guide groove the wheel bridge (18) with a wheel bridge bore (19) is fitted.