초록 ▼

A hydrostatic transmission including a hydraulic pump and a hydraulic motor fluidly connected with each other, being immersed in an oil sump formed in a housing. A pair of oil passages for fluidly connecting the hydraulic pump with the hydraulic motor are formed in a center section on which the hydr

A hydrostatic transmission including a hydraulic pump and a hydraulic motor fluidly connected with each other, being immersed in an oil sump formed in a housing. A pair of oil passages for fluidly connecting the hydraulic pump with the hydraulic motor are formed in a center section on which the hydraulic pump and the hydraulic motor are mounted. The center section is provided on an outer surface thereof with a pair of openings of the respective oil passages. A control arm is disposed in the housing so as to interlock with a pump capacity changing member like a movable swash plate, thereby enabling the pump capacity changing member to be moved to various actuation positions including a neutral position in association with rotation of the control arm rotated to various actuation positions including a neutral position. A contact member having a surface abutting against the pair of openings of the center section is formed integrally with the control arm. A pair of oil passages are provided in the contact member. The pair of oil passages in the contact member are shut from the oil sump and open on the surface of the contact member. The pair of oil passages in the contact member communicate with the respective openings of the center section when the control arm is located in a certain range including the neutral position. An orifice is provided in the contact member so as to connect the pair of oil passages in the contact member with each other.

대표청구항 ▼

A hydrostatic transmission including a hydraulic pump and a hydraulic motor fluidly connected with each other, being immersed in an oil sump formed in a housing. A pair of oil passages for fluidly connecting the hydraulic pump with the hydraulic motor are formed in a center section on which the hydr

A hydrostatic transmission including a hydraulic pump and a hydraulic motor fluidly connected with each other, being immersed in an oil sump formed in a housing. A pair of oil passages for fluidly connecting the hydraulic pump with the hydraulic motor are formed in a center section on which the hydraulic pump and the hydraulic motor are mounted. The center section is provided on an outer surface thereof with a pair of openings of the respective oil passages. A control arm is disposed in the housing so as to interlock with a pump capacity changing member like a movable swash plate, thereby enabling the pump capacity changing member to be moved to various actuation positions including a neutral position in association with rotation of the control arm rotated to various actuation positions including a neutral position. A contact member having a surface abutting against the pair of openings of the center section is formed integrally with the control arm. A pair of oil passages are provided in the contact member. The pair of oil passages in the contact member are shut from the oil sump and open on the surface of the contact member. The pair of oil passages in the contact member communicate with the respective openings of the center section when the control arm is located in a certain range including the neutral position. An orifice is provided in the contact member so as to connect the pair of oil passages in the contact member with each other. d in that it further comprises the steps of: shaping the first sheet into the configuration substantially complementary to that of the product in a manner such that the first sheet thus shaped can house the product substantially in its entirety, applying the second sheet to the product, keeping the second sheet in a substantially flat condition at least in a respective central region surrounded by the respective peripheral region, and shaping the mutually connected homologous peripheral regions relative to the central portion of the second sheets which is kept flat, so as to form a holding cup comprising a central flat section acting as a base and an annular rim projecting upwardly from said base and surrounding at a radial distance the wrapped product. 2. A method according to claim 1, comprising the step of shaping the mutually connected homologous peripheral regions with a generally pleated pattern. 3. A method according to claim 1, wherein, after the forming, the wrapper holding cup for housing the product is further shaped by pushing its free edge towards the first sheet and the product housed therein. 4. A method according to claim 1, wherein the first sheet is selected so as to have substantially larger dimensions than the second sheet. 5. A method according to claim 1, comprising the step of selecting dimensions for the first sheet such that, once the first sheet has been shaped to a configuration substantially complementary to that of the product, the first sheet still comprises a substantially flat peripheral region which can define one of the homologous peripheral regions. 6. A method according to claim 1, wherein the first sheet is shaped by forming between a die and a punch. 7. A method according to claim 1, wherein the first sheet is shaped by a drawing operation. 8. A method according to claim 1, wherein the second sheet is applied to the product without shaping operations. 9. A method according to claim 1, wherein the first sheet and the second sheet are connected to one another sealingly by a connecting operation selected from the group constituted by: gluing with the application of added material, heat-sealing, and ultrasound welding. 10. A method according to claim 1, comprising the step of coating the first sheet and the second sheet with a layer of hot-melting material on the connecting surfaces. 11. A method according to claim 10, wherein the removal step is performed simultaneously with the connection of the first sheet and the second sheet or in a subsequent step. 12. A method according to claim 1, comprising the step of removing the portions of the homologous peripheral regions which are outside the mutual connection region. 13. A method according to claim 1, comprising the step of selecting a metallic material, preferably aluminium, for the first sheet and for the second sheet. 14. A method according to claim 1, wherein the first sheet and the second sheet are of substantially identical colour. 15. A method according to claim 1, wherein the first sheet and the second sheet are selected so as to be, at least partially, of different colours. 16. A device for implementing the method according to claim 1, characterized in that it comprises: shaping means for shaping the first sheet to a configuration substantially complementary to that of the product, connecting means for connecting the second sheet, which is arranged so as to cover the cavity defined by the first sheet and housing the product, and further shaping means for shaping the first sheet and the second sheet around the product, the shaping means are configured in a manner such that the first sheet shaped to the said configuration can house the product substantially in its entirety, the connection means are configured so as to connect the first sheet and the second sheet in respective homologous peripheral regions, the second sheet being kept in a substantially flat condition at least in a central region surrounded by the res pective peripheral region, and the further shaping means are configured for acting on the homologous regions connected to one another by the connecting means adjacent the product housed in the first sheet, the further shaping means comprising complementary shaping elements which can shape the mutually connected homologous regions of the first sheet and of the second sheet towards the product so as to form a holding cup for housing the product. 17. A device according to claim 16, wherein the further shaping means comprise: a forming cavity which can be entered by the product housed in the substantially closed wrapper, starting from the central region of the second sheet, and a male element which can penetrate the forming cavity like a punch, acting on the wrapper adjacent the product in the mutually connected homologous regions of the first sheet and of the second sheet so as to compress the mutually connected homologous regions between the wall of the forming cavity and the male element, performing the further shaping. 18. A device according to claim 17, wherein the male element has a generally punch-like configuration. 19. A device according to claim 17, wherein the forming cavity and the male element have complementary tapered shapes, the taper appearing in the direction in which the male element penetrates the forming cavity. 20. A device according to claim 17, wherein the forming cavity has an input opening and an outlet opening for the product housed in the wrapper, the penetration of the male element taking place from the input opening towards the outlet opening. 21. A device according to claim 20, wherein: the forming cavity and the male element have complementary shapes such as to allow the male element to penetrate a certain portion of the forming cavity disposed between the input opening and the outlet opening, the arrangement being such that the male element can be disengaged from the homologous regions of a wrapper subjected to the further shaping, the wrapper and the product housed therein being retained in the forming cavity, and pulling means are provided for causing the wrapper and the product housed therein, which are retained in the forming cavity, to advance towards the outlet opening, bringing about further bending of the free edge of the case-shaped wrapper portion for housing the product towards the product, as a result of the general taper of the forming cavity. 22. A device according to claim 21, wherein the pulling means comprise an abutment element which can cooperate with the central region of the second sheet and is movable into the forming cavity in coordination with the penetration movement of the male element. 23. A device according to claim 21, wherein the pulling means are configured as gripping elements which can act on the wrapper. 24. A device according to claim 23, wherein the pulling means are configured as an element for gripping by means of subatmospheric pressure. 25. A device according to claim 16, wherein the further shaping means have a substantially pleated surface shape in the portions cooperating with the homologous regions of the first sheet and of the second sheet. 26. A device according to claim 16, wherein the shaping means comprise a die and a punch. 27. A device according to claim 16, wherein the shaping means comprise a drawing tool. 28. A device according to claim 16, wherein the connecting means are selected from the group constituted by: means for gluing with the supply of external material, heat-sealing means, ultrasound welding means. 29. A device according to claim 16, comprising means for removing the portions of the first sheet and of the second sheet which extend beyond the mutually connected homologous regions. 30. A device according to claim 29, wherein the connecting means are configured so as to remove the portions of the first sheet and of the second sheet which extend beyond the homologous regions. 31. A food product wrapped in a wrapper