Ordnance – Mounts – With recoil check
Reexamination Certificate
1999-11-24
2001-05-08
Eldred, J. Woodrow (Department: 3644)
Ordnance
Mounts
With recoil check
C089S198000
Reexamination Certificate
active
06227097
ABSTRACT:
BACKGROUND OF THE INVENTION
The technical scope of the present invention is that of recoil mechanisms for artillery cannons.
In a known manner, an artillery cannon comprises:
a recoil mass, essentially formed by a barrel-breech assembly,
a recoil mechanism, generally hydraulic, placed between the recoil mass and a cannon top carriage.
The recoil mechanism is formed of a recoil brake and a recuperator. The recoil brake is intended to brake and limit the recoil of the recoil mass after firing. The role of the recuperator is to stock part of the recoil energy and thereafter to return it to the recoil mass to perform the counter-recoil, in preparation for further firing.
During the counter-recoil, the recoil mass is gradually braked at the end of its course, so as to avoid jolting the top carriage. This braking is generally ensured by a buffer that penetrates inside a ring rolling the oil located between the two parts. This braking device operating at the end of the counter-recoil is generally an integral part of the recoil brake.
According to the temperature, the brake oil of the recoil brake is of variable viscosity. At low temperatures, its viscosity is increased, causing the braking to slow down at the end of the counter-recoil, and thus increasing counter-recoil time. This causes the firing rates of the artillery cannon to be reduced, which is extremely disadvantageous for the weapon system.
SUMMARY OF THE INVENTION
The aim of the invention is to propose a device to regulate the counter-recoil of an artillery cannon, according to the temperature, thus enabling the afore-mentioned disadvantages to be overcome.
Thus, the subject of the invention is a device to regulate the counter-recoil rate for an artillery cannon according to the temperature, comprising a buffer co-operating with a ring, so as to ensure the gradual braking of the cannon at the end of the counter-recoil operation by rolling the brake oil through a leakage section located between the buffer and the ring, wherein said device incorporates at least one modulation device comprising a heat-sensitive element made in a shape-memory alloy, such element ensuring, by its distortion, an increase in the leakage section when the temperature drops below a given threshold.
The heat-sensitive element can, advantageously, be constituted by the ring and/or the buffer.
According to another embodiment, the heat-sensitive element can be integral with the buffer.
According to a first variant embodiment, the buffer can incorporate an additional passage for the oil whose section is modified by the modulation device displaced by the action of the heat-sensitive device. The additional oil passage can be constituted by at least one blind axial channel opening out to the fore of the buffer and by a blind radial channel made somewhere to the rear of the buffer, the two channels being inter-connected. The modulation device can comprise a tube placed inside the axial channel of the buffer, such tube being able to block the radial channel under the action of the heat-sensitive element when the temperature has reached the given threshold, such tube being displaced axially in one direction by the action of the heat-sensitive element and in the other by the action of a spring.
According to a second embodiment, the buffer can incorporate a second axial channel opening out at the end of the radial channel so as to provide the additional oil passage and the modulation device can comprise an axial rod placed inside the first axial channel, such rod being able to block the radial channel under the action of the heat-sensitive element when the temperature exceeds the given threshold. The rod can incorporate a groove for the passage of the oil and can be displaced axially in one direction by the action of the heat-sensitive element and in the other by the action of a spring so as to bring the groove opposite the radial channel of the buffer.
According to another embodiment, the rod can incorporate a radial opening for the passage of the oil located level with the radial channel of the buffer and it can be displaced angularly by the heat-sensitive element. The modulation device can comprise a flap able to block the front end of the axial channel of the buffer, such flap being displaced angularly by the heat-sensitive element.
REFERENCES:
patent: H217 (1987-02-01), Jorczak
patent: 5168120 (1992-12-01), Rossel
patent: 5663521 (1997-09-01), Mandereau et al.
patent: 1505915 (1967-12-01), None
Brianne Joël
Charton Alain
Eldred J. Woodrow
Giat Industries
Oliff & Berridg,e PLC
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