# US 5,346,432 A · Driveshaft with additional masses > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,346,432 A - Document ID: US5346432A - Status: Granted - Kind: A - Application number: 07/751,079 - Filed: 1991-08-28 - Granted: 1994-09-13 - Earliest claimed: 1990-08-29 - Inventors: Klaus Greulich; Peter Amborn - Web page: https://patentgrep.com/patent/US5346432A ## CPC - F16C 3/02: Shafts; Axles - B60K 17/22: characterised by arrangement, location, or type of main drive shafting, e.g. cardan shaft - F16F 15/10: Suppression of vibrations in rotating systems by making use of members moving with the system (by balancing F16F15/22 {; yielding couplings F16D3/00} ; with flywheels acting variably or intermittently F16H {; construction providing resilience or vibration-damping for gear elements F16H55/14}) - F16C 2326/06: Drive shafts - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION ## Abstract The invention has a driveshaft (6, 8a, 8b and 10), especially used in the drive line of a motor vehicle (1), with a tubular shaft which has a central tube region (R.sub.m) and end pieces (11 and 12) formed on both ends. For optimizing the torsional characteristics of the driveshaft (6, 8a, 8b and 10), it includes at least one mass element (13) which is formed by reducing the inner diameter (D.sub.i) and/or increasing the outer diameter (D.sub.a) of the shaft wall. These additional mass elements (13) may be arranged symmetrically or asymmetrically in the axial direction of the driveshaft (6, 8a, 8b and 10). If the additional mass elements are arranged asymmetrically, the center of gravity is displaced, thereby optimizing the driveshaft 6, 8a, 8b and 10) of certain vehicle types with respect of its natural frequencies. ## Claims ### Claim 1 A one piece driveshaft formed by deformation comprising: a tubular shaft comprising a central portion, a pair of transition portions adjacent said central portion, and a pair of end portions, each end portion including a toothed receiving portion for connection with torque transmitting means, said tubular shaft showing symmetry of rotation and having a circumferential wall defining an internal central bore passing through said shaft; and at least one mass element integrally connected to and axially positioned along said central tube portion, said mass element unitarily formed with said shaft as a radially thickened wall portion, said wall of said shaft in said transition portions being conical between said central portion and said end portions internally and externally and said wall of said shaft in said central portion being of uniform circumferential thickness with the exception of the area of said at least one mass element and said wall in said central portion having a uniform circumferential thickness and an increased outer diameter or a decreased diametrical central bore in the area of said at least one mass element and said end portion central bore having a constant diameter which is smaller than the diameter of the central portion central bore and said at least one mass element maintains the symmetry of rotation of the driveshaft. ### Claim 2 (depends on 1) A driveshaft according to claim 1, wherein said at least one mass element is symmetrical to maintain axial symmetry of masses of the driveshaft. ### Claim 3 (depends on 1) A driveshaft according to claim 1, wherein the center of gravity of the driveshaft in a vehicle including drive components, points to drive components with greater mass. ### Claim 4 (depends on 1) A driveshaft according to claim 1, wherein said at least one mass element is arranged asymmetrically in the axial direction. ### Claim 5 A one piece driveshaft formed by deformation comprising: a tubular shaft comprising a central portion, a pair of transition portions adjacent said central portion, and a pair of end portions, each end portion including a toothed receiving portion for connection with torque transmitting means, said tubular shaft showing symmetry of rotation and having a circumferential wall defining an internal central bore passing through said shaft; and at least one mass element integrally connected to and axially positioned along said central tube portion, said mass element unitarily formed with said shaft as a radially thickened wall portion, said wall of said shaft in said transition portions being conical between said central portion and said end portions internally and externally and said wall of said shaft in said central portion being of uniform circumferential thickness with the exception of the area of said at least one mass element and said wall in said central portion having a uniform circumferential thickness and an increased outer diameter or a decreased diametrical central bore in the area of said at least one mass element and said end portion central bore having a constant diameter which is smaller than the diameter of the central portion central bore, wherein said at least one mass element has a variable wall thickness. ### Claim 6 A one piece driveshaft formed by deformation comprising: a tubular shaft comprising a central portion, a pair of transition portions adjacent said central portion, and a pair of end portions, each end portion including a toothed receiving portion for connection with torque transmitting means, said tubular shaft showing symmetry of rotation and having a circumferential wall defining an internal central bore passing through said shaft; and at least one mass element integrally connected to and axially positioned along said central tube portion, said mass element unitarily formed with said shaft as a radially thickened wall portion, said wall of said shaft in said transition portions being conical between said central portion and said end portions internally and externally and said wall of said shaft in said central portion being of uniform circumferential thickness with the exception of the area of said at least one mass element and said wall in said central portion having a uniform circumferential thickness and an increased outer diameter or a decreased diametrical central bore in the area of said at least one mass element and said end portion central bore having a constant diameter which is smaller than the diameter of central portion central bore, wherein a plurality of additional mass elements are positioned on said shaft.