TM-9-2520-254-34 Direct Support for M113 TX100-1 Transmission 2520-00-066-4240 Download

2-3. Intermediate-Range Clutch and Planetary a. Intermediate-Range Clutch Components (fig. 2-1). The intermediate-range clutch includes a stationary back plate assembly (18), piston (21), three internal-splined, and two external-tanged clutch plates (19), and ten return springs (51). The piston housing assembly (22) serves also as a reaction plate for the low-range clutch. b. Intermediate-Range Planetary Gears (fig. 2- 1). (1) A 31-tooth sun gear (53), 59-tooth (in- ternal) ring gear (20), and a carrier assembly (54) with four 14-tooth pinions make up the in- termediate-range gear set. The sun gear is the driving member, the ring gear is the reaction member, and the carrier assembly is the driven member. (2) The sun gear (53) is splined to the turbine shaft (59) and meshes with the carrier pinions. The carrier assembly (54) includes splines at the front which engage the internal-splined, high-range clutch plates (17), and splines at the rear which engage the low-range ring gear (23). The carrier pinions mesh with both the sun gear (53) and ring gear (20). The ring gear internal teeth mesh with the carrier pinions. Its external splines engage the intern al-splined clutch plates (19). A retainer at the outer circumference of the ring gear (20) prevents the gear moving forward or rearward. c. Operation of Intermediate-Range Clutch and Planetary Gears (fig. 2-1). (1) When the intermediate-range clutch (19) is applied. the clutch piston compresses the clutch plates against the back plate (18). This holds the ring gear (20) stationary. The sun gear (53) drives the carrier assembly (54) and low-range ring gear (23) at reduced speed. The low-range sun gear (46) (rotating at the same speed as the intermediate- range sun gear (53) and the low-range ring gear (23) (rotating at a lower speed) combine to drive the low-range planetary carrier and transmission output shaft at a different rate of speed. (2) The actual speed reduction ratio in the intermediate-range gear set is 2.90 to 1. However, when this ratio is combined with that of the low- range gear set. the overall speed reduction ratio is 1.93 to 1. The interaction of two planetary gear sets to produce a desired ratio is called compounding. (3) When hydraulic pressure is exhausted from the intermediate-range clutch piston housing, springs (51) return the piston (21) into the housing bore. Released, the internal-splined clutch plates rotate independently of the stationary, external- tanged plates. 2-4. Low-Range Clutch and Planetary a. Low-Range Clutch Components (fig. 2-1). The low-range clutch (24) includes 3 external- tanged plates, 3 internal-splined plates, and 12 return springs (47). The intermediate-range housing assembly (22) serves as the low-range clutch back plate. The low- and reverse-range housing assembly (26) serves jointly for the low- and reverse-range clutches. Pins in the housing assembly anchor the low-range, external-tanged clutch plates, as well as the reverse-range, external- tanged plates, against rotation. b. Low-Range Planetary Gears (fig. 2-1). (1) A 21-tooth sun gear (46), 59-tooth (in- ternal) ring gear (23), and a carrier assembly and transmission output shaft with four 19-tooth pinions make up the low-range gear set. The sun gear is the driving member, the ring gear is the reaction member, and the carrier assembly and output shaft is the driven member. (2) The sun gear (46) is splined to the turbine shaft (59) and meshes with the carrier pinions. The carrier assembly is integral with the transmission output shaft (33). The carrier pinions mesh with both the sun gear (46) and ring gear (23). The ring gear internal teeth mesh with the carrier pinions. The ring gear external splines engage the low- range, internal-splined plates. At the front, the ring gear (23) is attached to the intermediate-range carrier (54). At its rear, the ring gear is attached to the reverse-range sun gear shaft (40). c. operation of Low-Range Clutch and Planetary Gears (fig. 2-1). (1) When the low-range clutch (24) is applied, the clutch piston compresses the clutch plates against the housing (22). This holds the ring gear (23) stationary + The sun gear (46) drives carrier assembly and output shaft (33) at reduced speed. (2) The speed reduction in the low-range planetary is 3.81 to 1 for low-range operation. The low-range gears have another role in reverse-range operation. They are compounded with the reverse- range gears (para 2-5). (3) When the low-range clutch is released. springs (47) push the piston (25) back into the housing (26). This permits the low-range, internal- splined plates to rotate independently of the stationary . external-tanged plates. 2-5. Reverse-Range Clutch and Planetary a. Reverse-Range Clutch Components (fig. 2-1). The reverse-range clutch includes a stationary back plate (30), piston (27). 4 internal-splined and 3 external-tanged clutch plates (28), and 12 return springs (43). The piston housing assembly (26) serves jointly for the reverse- and low-range clutches. Pins in the housing assembly anchor the reverse-range, external-tanged clutch plates, as well as the low-range, external-tanged clutch plates, against rotation. b. Reverse-Range Planetary Gears (fig. 2-1). 2-4