Patents by Inventor Daisuke Murashima
Daisuke Murashima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 11547051Abstract: A hydrostatic transaxle includes: a casing that is provided with an openable and closable filter insertion port and is filled with hydraulic oil; a hydraulic continuously variable transmission that is arranged inside the casing; a filter holding member that includes a support base that is a hollow cylindrical portion and oil-tightly partitions an inside of a cylinder and an outside of the cylinder, and a filter connection port that is a hollow cylindrical portion extending from a peripheral side surface of the support base and communicating with the inside of the cylinder, the support base communicating the inside of the cylinder to the port, and arranged between the center section and the casing facing the port; and a filter body that is freely inserted to and removed from the casing via the filter insertion port.Type: GrantFiled: November 14, 2018Date of Patent: January 10, 2023Assignee: KANZAKI KOKYUKOKI MFG. CO., LTD.Inventors: Toshifumi Yasuda, Hiroshi Sugimoto, Daisuke Murashima, Masaru Iida, Koji Iwaki
-
Patent number: 11338671Abstract: A hydraulic transaxle of the present invention includes an axle, a hydraulic static transmission (“HST”), a center case that has pair of oil passages for circulating the hydraulic oil between the hydraulic pump and the hydraulic motor, and a gear mechanism that transmits an output of the HST to the axle. A case supports the axle and accommodates the HST while also forming an oil reservoir. A hydraulic motor of the HST includes a motor shaft, a cylinder block with a plurality of cylinders fixed to the motor shaft, a plurality of pistons inserted into the cylinders, a fixed swash plate abutted by the plurality of pistons, and a fixed swash plate holder that supports the fixed swash plate with respect to the case. The motor shaft of the hydraulic motor is supported by the center case and the fixed swash plate holder.Type: GrantFiled: May 29, 2020Date of Patent: May 24, 2022Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Michio Tsukamoto, Hiroshi Sugimoto, Daisuke Murashima, Tetsuya Kawatani
-
Patent number: 11079014Abstract: A traveling hydraulic stepless transmission (“HST”), ensures stopping of a vehicle on a slope under high load conditions, maintains stopping the vehicle on flat ground under low load conditions, and enables smooth starting from a stop. The HST includes a neutral check valve (“NCV”) and an internal damping system (“IDS”). The NCV includes a first orifice that opens a first oil passage to a transaxle case when a pressure in the first oil passage is equal to or less than a predetermined pressure, and that connects the second oil passage to the transaxle case when a pressure in a second oil passage is equal to or less than the predetermined pressure. The IDS includes second orifices that connect a high pressure side of the oil passages to the transaxle case when a discharge rate of the hydraulic pump is equal to or less than a predetermined discharge rate.Type: GrantFiled: October 1, 2019Date of Patent: August 3, 2021Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Daisuke Murashima, Michio Tsukamoto
-
Patent number: 10895249Abstract: A hydraulic transaxle comprises an axial piston hydraulic pump having a variable displacement, and a transaxle casing incorporating the hydraulic pump. The hydraulic pump includes a movable swash plate and a pair of trunnion shafts. The transaxle casing includes a pair of side walls, and includes a pair of casing holes each of which penetrates each of the side walls between an inside and an outside of the transaxle casing. The pair of trunnion shafts are passed through the respective casing holes. The swash plate is formed with a pair of swash plate holes in the respective side portions facing the respective side walls in the inside of the transaxle casing. Proximal end portions of the respective trunnion shafts are inserted into the respective swash plate holes. A distal end portion of one of the trunnion shafts projects from the corresponding casing hole to the outside of the transaxle casing.Type: GrantFiled: April 13, 2017Date of Patent: January 19, 2021Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Daisuke Murashima, Koji Iwaki, Toshifumi Yasuda, Katsumoto Mizukawa
-
Publication number: 20200376957Abstract: A hydraulic transaxle of the present invention includes an axle, a hydraulic static transmission (“HST”), a center case that has pair of oil passages for circulating the hydraulic oil between the hydraulic pump and the hydraulic motor, and a gear mechanism that transmits an output of the HST to the axle. A case supports the axle and accommodates the HST while also forming an oil reservoir. A hydraulic motor of the HST includes a motor shaft, a cylinder block with a plurality of cylinders fixed to the motor shaft, a plurality of pistons inserted into the cylinders, a fixed swash plate abutted by the plurality of pistons, and a fixed swash plate holder that supports the fixed swash plate with respect to the case. The motor shaft of the hydraulic motor is supported by the center case and the fixed swash plate holder.Type: ApplicationFiled: May 29, 2020Publication date: December 3, 2020Inventors: Michio TSUKAMOTO, Hiroshi SUGIMOTO, Daisuke MURASHIMA, Tetsuya KAWATANI
-
Patent number: 10711887Abstract: A transaxle includes a continuously variable transmission including a speed control arm and a neutral return spring allowing a biasing force to act on the speed control arm toward a neutral position, the speed control arm configured to operate from the neutral position to a forward position or a backward position to perform a continuous speed variation. The biasing force does not act on the speed control arm when the neutral return spring ranges from the neutral position to a predetermined speed position on a forward movement side, and the biasing force acts on the speed control arm when the neutral return spring ranges from the predetermined speed position to a maximum speed position on the forward movement side.Type: GrantFiled: April 6, 2018Date of Patent: July 14, 2020Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Daisuke Murashima, Toshifumi Yasuda, Koji Iwaki, Masaru Iida
-
Patent number: 10670127Abstract: A transaxle comprises a hydrostatic transmission (hereinafter, “HST”), an axle, a gear train transmitting power from the HST to the axle, a casing carrying the HST, the gear train and the axle and providing a fluid sump. The casing has an air space over the fluid sump of a gear chamber, a breather cap for ventilation of the air space and for an oil cap is installed on a top part of the casing, and a partition plate is installed right under the breather cap and prevents the fluid sup facing directly to the breather cap.Type: GrantFiled: August 9, 2017Date of Patent: June 2, 2020Assignee: KANZAKI KOKYUKOKI MFG. CO., LTD.Inventors: Hiroshi Sugimoto, Nobuhiro Shimobayashi, Toshifumi Yasuda, Takehiro Oota, Daisuke Murashima
-
Publication number: 20200103011Abstract: A traveling hydraulic stepless transmission (“HST”), ensures stopping of a vehicle on a slope under high load conditions, maintains stopping the vehicle on flat ground under low load conditions, and enables smooth starting from a stop. The HST includes a neutral check valve (“NCV”) and an internal damping system (“IDS”). The NCV includes a first orifice that opens a first oil passage to a transaxle case when a pressure in the first oil passage is equal to or less than a predetermined pressure, and that connects the second oil passage to the transaxle case when a pressure in a second oil passage is equal to or less than the predetermined pressure. The IDS includes second orifices that connect a high pressure side of the oil passages to the transaxle case when a discharge rate of the hydraulic pump is equal to or less than a predetermined discharge rate.Type: ApplicationFiled: October 1, 2019Publication date: April 2, 2020Inventors: Daisuke MURASHIMA, Michio TSUKAMOTO
-
Patent number: 10570893Abstract: A housing of a hydraulic pump is configured to have a servo unit detachably attached thereto so as to control tilt direction and angle of its movable swash plate. A port block is formed therein with a pair of main ports and, and a pair of main fluid passages and fluidly connecting respective main ports and to cylinders in its cylinder block. Main ports are used to have respective external pipes connected thereto so as to fluidly connect the hydraulic pump to a hydraulic motor disposed outside of the hydraulic pump, thereby constituting a hydrostatic transmission.Type: GrantFiled: May 26, 2016Date of Patent: February 25, 2020Assignee: KANZAKI KOKYUKOKI MFG. CO., LTD.Inventors: Toshifumi Yasuda, Daisuke Murashima, Takehiro Ota
-
Publication number: 20190141898Abstract: A hydrostatic transaxle includes: a casing that is provided with an openable and closable filter insertion port and is filled with hydraulic oil; a hydraulic continuously variable transmission that is arranged inside the casing; a filter holding member that includes a support base that is a hollow cylindrical portion and oil-tightly partitions an inside of a cylinder and an outside of the cylinder, and a filter connection port that is a hollow cylindrical portion extending from a peripheral side surface of the support base and communicating with the inside of the cylinder, the support base communicating the inside of the cylinder to the port, and arranged between the center section and the casing facing the port; and a filter body that is freely inserted to and removed from the casing via the filter insertion port.Type: ApplicationFiled: November 14, 2018Publication date: May 16, 2019Inventors: Toshifumi Yasuda, Hiroshi Sugimoto, Daisuke Murashima, Masaru Iida, Koji Iwaki
-
Publication number: 20180223993Abstract: A transaxle includes a continuously variable transmission including a speed control arm and a neutral return spring allowing a biasing force to act on the speed control arm toward a neutral position, the speed control arm configured to operate from the neutral position to a forward position or a backward position to perform a continuous speed variation. The biasing force does not act on the speed control arm when the neutral return spring ranges from the neutral position to a predetermined speed position on a forward movement side, and the biasing force acts on the speed control arm when the neutral return spring ranges from the predetermined speed position to a maximum speed position on the forward movement side.Type: ApplicationFiled: April 6, 2018Publication date: August 9, 2018Inventors: Daisuke MURASHIMA, Toshifumi YASUDA, Koji IWAKI, Masaru IIDA
-
Patent number: 9964126Abstract: A transaxle comprises a transaxle casing, axle, brake, brake arm, first and second link members, and relay arm. The brake includes a brake operation shaft pivotally supported by the transaxle casing for shifting between brake activation and inactivation states. A starting end of the first link member is connected to a manipulator, and a terminal end of the second link member is connected to the brake arm. The relay arm is pivotally centered on a first pivotal axis outside of the transaxle casing, and includes a first arm portion extended from the first pivotal axis to a first end and a second arm portion extended from the first pivotal axis to a second end. A terminal end of the first link member is connected to the first arm portion, and a starting end of the second link member is connected to the second arm portion.Type: GrantFiled: June 12, 2015Date of Patent: May 8, 2018Assignee: KANZAKI KOKYUKOKI MFG. CO., LTD.Inventors: Daisuke Murashima, Trevor Nienke, Toshifumi Yasuda, Koji Iwaki, Masaru Iida
-
Publication number: 20170335938Abstract: A transaxle comprises a hydrostatic transmission (hereinafter, “HST”), an axle, a gear train transmitting power from the HST to the axle, a casing carrying the HST, the gear train and the axle and providing a fluid sump. The casing has an air space over the fluid sump of a gear chamber, a breather cap for ventilation of the air space and for an oil cap is installed on a top part of the casing, and a partition plate is installed right under the breather cap and prevents the fluid sup facing directly to the breather cap.Type: ApplicationFiled: August 9, 2017Publication date: November 23, 2017Inventors: Hiroshi SUGIMOTO, Nobuhiro SHIMOBAYASHI, Toshifumi YASUDA, Takehiro OOTA, Daisuke MURASHIMA
-
Publication number: 20170284510Abstract: A dual clutch transmission comprises a housing formed therein with a gear chamber incorporating an odd-numbered speed gear train group and an even-numbered speed gear train group. An end of the input shaft is connected to an engine, and a cover is detachably attached to the housing opposite the end of the input shaft so as to define a clutch chamber divided from the gear chamber. A first clutch for the odd-numbered speed gear train group and a second clutch for the even-numbered speed gear train group are disposed in the clutch chamber. Fluid passages for supplying hydraulic fluid to the first and second clutches are formed in the cover.Type: ApplicationFiled: March 29, 2017Publication date: October 5, 2017Inventors: Koji IWAKI, Jun MATSUURA, Nobuhiro SHIMOBAYASHI, Daisuke MURASHIMA, Tetsuya KAWATANI, Shuji NISHIMOTO, Tatsuya KAMADA, Takehiro OTA
-
Patent number: 9759310Abstract: A transaxle comprises a hydrostatic transmission (HST), an axle, a gear train interposed between the HST and the axle, a casing and a partition. The casing defines an HST chamber and a gear chamber. The HST is disposed in the HST chamber. The gear train and the axle are disposed in the gear chamber. The partition is disposed in the casing so as to separate the HST chamber and the gear chamber from each other. The partition has an opening through which a hydraulic motor of the HST passes to extend from the HST chamber into the gear chamber so as to be drivingly connected to the gear train. The partition obstructs a flow of fluid between a fluid sump in the HST chamber from a fluid sump in the gear chamber.Type: GrantFiled: April 10, 2015Date of Patent: September 12, 2017Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Toshifumi Yasuda, Daisuke Murashima, Koji Iwaki, Hiroki Maehara, Koga Yamane
-
Publication number: 20170218929Abstract: A hydraulic transaxle comprises an axial piston hydraulic pump having a variable displacement, and a transaxle casing incorporating the hydraulic pump. The hydraulic pump includes a movable swash plate and a pair of trunnion shafts. The transaxle casing includes a pair of side walls, and includes a pair of casing holes each of which penetrates each of the side walls between an inside and an outside of the transaxle casing. The pair of trunnion shafts are passed through the respective casing holes. The swash plate is formed with a pair of swash plate holes in the respective side portions facing the respective side walls in the inside of the transaxle casing. Proximal end portions of the respective trunnion shafts are inserted into the respective swash plate holes. A distal end portion of one of the trunnion shafts projects from the corresponding casing hole to the outside of the transaxle casing.Type: ApplicationFiled: April 13, 2017Publication date: August 3, 2017Applicant: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Daisuke MURASHIMA, Koji IWAKI, Toshifumi YASUDA, Katsumoto MIZUKAWA
-
Patent number: 9556958Abstract: A shift-drum speed change mechanism includes a first drum spring biasing a first drum toward a first side in an axial direction, which is a side on which a first slider comes into contact with a first speed change member, a first fork spring biasing a first shift fork toward a second side in the axial direction, which is a side opposite to the first side in the axial direction, with a weaker biasing force than the first drum spring, and a first stopper member for the first drum, defining an end of movement of the first drum toward the first side in the axial direction.Type: GrantFiled: November 24, 2015Date of Patent: January 31, 2017Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.Inventors: Michio Tsukamoto, Shuji Nishimoto, Daisuke Murashima
-
Publication number: 20160363203Abstract: A transaxle comprises a transaxle casing, axle, brake, brake arm, first and second link members, and relay arm. The brake includes a brake operation shaft pivotally supported by the transaxle casing for shifting between brake activation and inactivation states. A starting end of the first link member is connected to a manipulator, and a terminal end of the second link member is connected to the brake arm. The relay arm is pivotally centered on a first pivotal axis outside of the transaxle casing, and includes a first arm portion extended from the first pivotal axis to a first end and a second arm portion extended from the first pivotal axis to a second end. A terminal end of the first link member is connected to the first arm portion, and a starting end of the second link member is connected to the second arm portion.Type: ApplicationFiled: June 12, 2015Publication date: December 15, 2016Inventors: Daisuke MURASHIMA, Trevor NIENKE, Toshifumi YASUDA, Koji IWAKI, Masaru IIDA
-
Publication number: 20160348654Abstract: A housing of a hydraulic pump is configured to have a servo unit detachably attached thereto so as to control tilt direction and angle of its movable swash plate. A port block is formed therein with a pair of main ports and, and a pair of main fluid passages and fluidly connecting respective main ports and to cylinders in its cylinder block. Main ports are used to have respective external pipes connected thereto so as to fluidly connect the hydraulic pump to a hydraulic motor disposed outside of the hydraulic pump, thereby constituting a hydrostatic transmission.Type: ApplicationFiled: May 26, 2016Publication date: December 1, 2016Inventors: Toshifumi YASUDA, Daisuke MURASHIMA, Takehiro OTA
-
Publication number: 20160298743Abstract: A transaxle comprises a hydrostatic transmission (HST), an axle, a gear train interposed between the HST and the axle, a casing and a partition. The casing defines an HST chamber and a gear chamber. The HST is disposed in the HST chamber. The gear train and the axle are disposed in the gear chamber. The partition is disposed in the casing so as to separate the HST chamber and the gear chamber from each other. The partition has an opening through which a hydraulic motor of the HST passes to extend from the HST chamber into the gear chamber so as to be drivingly connected to the gear train. The partition obstructs a flow of fluid between a fluid sump in the HST chamber from a fluid sump in the gear chamber.Type: ApplicationFiled: April 10, 2015Publication date: October 13, 2016Inventors: Toshifumi YASUDA, Daisuke MURASHIMA, Koji IWAKI, Hiroki MAEHARA, Koga YAMANE